Download or read book Modeling of Combustion in the Reciprocating Engines Using a Reduced Kinetic Scheme written by El-Houssin Affad and published by . This book was released on 1994 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Combustion Modeling in Reciprocating Engines written by James N. Mattair and published by Springer. This book was released on 1980 with total page 624 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Modelling Diesel Combustion written by P. A. Lakshminarayanan and published by Springer Science & Business Media. This book was released on 2010-03-03 with total page 313 pages. Available in PDF, EPUB and Kindle. Book excerpt: Phenomenology of Diesel Combustion and Modeling Diesel is the most efficient combustion engine today and it plays an important role in transport of goods and passengers on land and on high seas. The emissions must be controlled as stipulated by the society without sacrificing the legendary fuel economy of the diesel engines. These important drivers caused innovations in diesel engineering like re-entrant combustion chambers in the piston, lower swirl support and high pressure injection, in turn reducing the ignition delay and hence the nitric oxides. The limits on emissions are being continually reduced. The- fore, the required accuracy of the models to predict the emissions and efficiency of the engines is high. The phenomenological combustion models based on physical and chemical description of the processes in the engine are practical to describe diesel engine combustion and to carry out parametric studies. This is because the injection process, which can be relatively well predicted, has the dominant effect on mixture formation and subsequent course of combustion. The need for improving these models by incorporating new developments in engine designs is explained in Chapter 2. With “model based control programs” used in the Electronic Control Units of the engines, phenomenological models are assuming more importance now because the detailed CFD based models are too slow to be handled by the Electronic Control Units. Experimental work is necessary to develop the basic understanding of the pr- esses.

Download or read book Combustion Modeling in Reciprocating Engines written by James N. Mattair and published by Springer. This book was released on 2013-09-11 with total page 605 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Combustion Modeling in Reciprocating Engines written by Symposium on Combustion Modeling in Reciprocating Engines and published by . This book was released on 1980-01-01 with total page 615 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Modelling Spark Ignition Combustion written by P. A. Lakshminarayanan and published by Springer Nature. This book was released on with total page 678 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Combustion Simulation and Kinetic Modeling Using Hybrid Reduction Scheme written by Jierui Liang and published by . This book was released on 2015 with total page 59 pages. Available in PDF, EPUB and Kindle. Book excerpt: Combustion simulation is a promising tool for multi-disciplines such as fuel development, engine design and emission control. Two biggest challenges confronting us include developing a sufficiently detailed kinetic mechanisms of combustion and formulating numerically implementing models that are capable to capture the essentials but computationally affordable. However, combustion simulations using detailed kinetic mechanisms are often prohibitive in computational fluid dynamics (CFD) due to unaffordable computational cost. Thus, the objective of the research is to reduce the computational intensity of detailed kinetic calculations by an on-the-fly/QSSA hybrid mechanism reduction scheme. The work consists of two parts: (i) integrating the hybrid reduction scheme in CRUNCH CFD® to enable detailed kinetic calculations; and (ii) applying the hybrid reduction scheme to larger kinetic mechanisms like n-pentane and biodiesel surrogate methyl butanoate (MB). The models include plug flow reactor (PFR), multi-dimensional engine CFD in KIVA-3V and a supersonic nozzle combustion in CRUNCH CFD®. A fast flux-based QSS species selection method is also employed to quickly select QSS species for various situations. The efficiency and accuracy of the hybrid reduction have been successfully demonstrated according to our results. Aided by fast QSS species selection, the hybrid reduction scheme is efficient to perform complex combustion simulations accurately using large detailed mechanisms.

Download or read book Modeling Engine Spray and Combustion Processes written by Gunnar Stiesch and published by Springer Science & Business Media. This book was released on 2003-04-10 with total page 314 pages. Available in PDF, EPUB and Kindle. Book excerpt: The utilization of mathematical models to numerically describe the performance of internal combustion engines is of great significance in the development of new and improved engines. Today, such simulation models can already be viewed as standard tools, and their importance is likely to increase further as available com puter power is expected to increase and the predictive quality of the models is constantly enhanced. This book describes and discusses the most widely used mathematical models for in-cylinder spray and combustion processes, which are the most important subprocesses affecting engine fuel consumption and pollutant emissions. The relevant thermodynamic, fluid dynamic and chemical principles are summarized, and then the application of these principles to the in-cylinder processes is ex plained. Different modeling approaches for the each subprocesses are compared and discussed with respect to the governing model assumptions and simplifica tions. Conclusions are drawn as to which model approach is appropriate for a specific type of problem in the development process of an engine. Hence, this book may serve both as a graduate level textbook for combustion engineering stu dents and as a reference for professionals employed in the field of combustion en gine modeling. The research necessary for this book was carried out during my employment as a postdoctoral scientist at the Institute of Technical Combustion (ITV) at the Uni versity of Hannover, Germany and at the Engine Research Center (ERC) at the University of Wisconsin-Madison, USA.

Download or read book Introduction to Modeling and Control of Internal Combustion Engine Systems written by Lino Guzzella and published by Springer Science & Business Media. This book was released on 2013-03-14 with total page 303 pages. Available in PDF, EPUB and Kindle. Book excerpt: Internal combustion engines still have a potential for substantial improvements, particularly with regard to fuel efficiency and environmental compatibility. These goals can be achieved with help of control systems. Modeling and Control of Internal Combustion Engines (ICE) addresses these issues by offering an introduction to cost-effective model-based control system design for ICE. The primary emphasis is put on the ICE and its auxiliary devices. Mathematical models for these processes are developed in the text and selected feedforward and feedback control problems are discussed. The appendix contains a summary of the most important controller analysis and design methods, and a case study that analyzes a simplified idle-speed control problem. The book is written for students interested in the design of classical and novel ICE control systems.

Download or read book Flow and Combustion in Reciprocating Engines written by C. Arcoumanis and published by Springer Science & Business Media. This book was released on 2009-06-29 with total page 427 pages. Available in PDF, EPUB and Kindle. Book excerpt: Optimization of combustion processes in automotive engines is a key factor in reducing fuel consumption. This book, written by eminent university and industry researchers, investigates and describes flow and combustion processes in diesel and gasoline engines.

Download or read book Evaluating Chemical Kinetic Behaviors in Internal Combustion Engines Using Simplified Zero dimensional Models written by and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Three-Dimensional (3-D) Computational Fluid Dynamics (CFD) models are one of the most common and robust methods used to model Internal Combustion Engine (ICE) in the automotive industry, particularly with respect to the complex fluid flow and heat transfer processes in engines. However, these methods can become extremely computationally expensive when simulating detailed chemical kinetic mechanisms or multi-component surrogate fuel blends where thousands of reactions must be solved simultaneously and are thus not well suited for kinetic mechanism development and evaluation. The goal of this research work is to use a simplified Zero-Dimensional (0-D) engine model to evaluate kinetic behaviors including Low Temperature Heat Release (LTHR) and Auto-Ignition (AI), and evaluate the role of thermal stratification on these predictions. Firstly, a large-bore low-swirl heavy-duty Homogeneous Charge Compression Ignition (HCCI) engine, namely the Caterpillar 3401 Single Cylinder Oil Test Engine (SCOTE), was simulated. In this work, three 0-D models were designed in Chemkin Pro, each denoted by the number of simulated "zones": Single-Zone (SZ), 3-Zone (3Z), and 6-Zone (6Z). To validate these models, the Chemkin results including cylinder pressure, temperature, and Heat Release Rate (HRR) traces were compared with existing 3D CFD model results. In the Chemkin 3Z model, an "Area Fraction (AF) Method" was found to match well with the CFD results under different operating conditions and can be attributed to the reduced role of thermal stratification in this engine platform. Therefore, an engine with higher thermal stratification effect: small bore, high-swirl and light-duty, namely the Cooperative Fuels Research (CFR) engine, has been modeled and validated. As expected, the success of the 3Z AF method that we made on the SCOTE engine cannot be fully replicated on the CFR engine. Future work may include extending the AF method to more zones and validating these 0D models under Spark-Ignition (SI) combustion conditions.

Download or read book Computational Optimization of Internal Combustion Engines written by Yu Shi and published by Springer Science & Business Media. This book was released on 2011-06-22 with total page 323 pages. Available in PDF, EPUB and Kindle. Book excerpt: Computational Optimization of Internal Combustion Engines presents the state of the art of computational models and optimization methods for internal combustion engine development using multi-dimensional computational fluid dynamics (CFD) tools and genetic algorithms. Strategies to reduce computational cost and mesh dependency are discussed, as well as regression analysis methods. Several case studies are presented in a section devoted to applications, including assessments of: spark-ignition engines, dual-fuel engines, heavy duty and light duty diesel engines. Through regression analysis, optimization results are used to explain complex interactions between engine design parameters, such as nozzle design, injection timing, swirl, exhaust gas recirculation, bore size, and piston bowl shape. Computational Optimization of Internal Combustion Engines demonstrates that the current multi-dimensional CFD tools are mature enough for practical development of internal combustion engines. It is written for researchers and designers in mechanical engineering and the automotive industry.

Download or read book Modeling and Simulation of Knock and Nitric Oxide Emissions in Turbocharged Direct Injection Spark Ignition Engines written by Dirk Linse and published by . This book was released on 2013-11-13 with total page 189 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Modeling and Simulation of Turbulent Combustion written by Santanu De and published by Springer. This book was released on 2017-12-27 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents a comprehensive review of state-of-the-art models for turbulent combustion, with special emphasis on the theory, development and applications of combustion models in practical combustion systems. It simplifies the complex multi-scale and nonlinear interaction between chemistry and turbulence to allow a broader audience to understand the modeling and numerical simulations of turbulent combustion, which remains at the forefront of research due to its industrial relevance. Further, the book provides a holistic view by covering a diverse range of basic and advanced topics—from the fundamentals of turbulence–chemistry interactions, role of high-performance computing in combustion simulations, and optimization and reduction techniques for chemical kinetics, to state-of-the-art modeling strategies for turbulent premixed and nonpremixed combustion and their applications in engineering contexts.

Download or read book Chemical Kinetic Modelling of Autoignition Under Conditions Relevant to Knock in Spark Ignition Engines written by Hakan Serhad Soyhan and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The phenomenon called the ''engine knock'' is an abnonnal combustion mode inspark ignition (SI) engines. it might lead to very high peak pressure in the cylinderand serious damages in engines. Knock limits the compression ratio of the ~ngine. The higher compression ratiomeans the higher fuel conversion efficiency of the engine. it also means highercylinder pressure and thereby higher gas temperature which can cause knock becauseof shorter ignition delay time. Increasing compression ratio is the simplest strategyfor increasing the efficiency of combustion, so a more detailed understanding of theprocesses goveming knock is important.it is generally accepted that knock is initiated by autoignition in the unbumed gasmixture as a result of compression due to the f1ame front propagation and the piston movement. Auto ignition can be defined as spontaneous ignition of some part of thecharge in the cylinder. The autoignition is may cause an extremely rapid chemicalenergy release. it causes a high local pressure and propagation of pressure waveswith high amplitude across the combustion chamber. The rapid rise in pressure andthe vibration of the resultant pressure wave across the combustion chamber cause erosion of the piston, piston rings and head gaskets. Known measures to avoid theoccurrence of engine knock cause either environmental problems, for example theusage of MTBE or reduce the engine thennal efficiency , for example lowcompression ratio, high swirl or early ignition timing. Because of this, the occurrenceof knock was subject of continuous public and industrial research.A detailed investigation of the combustion processes in intemal combustion engines is necessary for the improvement of engine technology .Chemical kinetic model ofthe combustion process implemented into the computational f1uid dynamic sapplications for the prediction of gas f1ow in the combustion chamber provides anefficient tool in tenns of time and cost for the investigation and improvement of the combustion process.The software tools for the modeling of combustion processes in combustion devicesrequire the reduction of the kinetic model to a limited number of species. Since the engine geometry is very complex, the performnnance of commercial software productsfor combustion device optimization decreases considerably if the number of species exceeds about 10. Consequently, a variety of methods in chemical kinetic modelingare needed to construct a reaction mechanism for a complex fuel such as PRF and toreduce it to a low number of capable species without a loss of information that mightbe important for the accuracy of the calculations. One method having the following steps is The generation of a ''detailed reaction mechanism'',The construction of the ''skeletal mechanism'',The final reduction of the reaction mechanism using Quasi Steady State Approximations (QSSA).This study concentrates on the construction of the problem oriented reduced mechanism. A method for automatic reduction of detailed kinetic to reduced mechanisms for complex fuels is proposed. The method is based on the simultaneoususe of sensitivity, reaction-f1ow and lifetime analyses. The sensitivity analysis detects species that the overall combustion process is sensitive on. Small in accuracies, in calculating these species, result in large errors in the characteristic behavior of the chernical scheme. Species, not relevant for the occurrence of autoignition in the end-gas, are defined as redundant. The automatic detection of there dundant species is done by means of an analysis of the reaction f1ows from and towards the most sensitive species, the fuel, the oxidizer and the final products. Theyare identified and eliminated for different pre-set levels of minimum reaction flow and sensitivity to generate a skeletal mechanism. The resulting skeletal mechanism is investigated with lifetime analysis to get the final reduced mechanism. A measure ofspecies lifetimes is taken from the diagonal elements of the Jacobian matrix of the chernical source terms. The species with the lifetime shorter than and mass-fractionIess than specified limits are assumed to be in steady state and selected for removalfrom the skeletal mechanism. The reduced mechanism is valid for the parameter range of initial and boundary values that the analysis has been performed for.The proposed reduction method is exemplified on a detailed reaction mechanism foriso-octane/n-heptane rnixtures. The gas-phase chernistry is analyzed in the end gas of an SI engine, using a two-zone model with conditions chosen relevant for engine knock. Comparing results obtained from the skeletal and the reduced mechanism swith results from the detailed mechanism shows the accuracy of the resulting mechanisms. it is shown that the error in the mechanisms increase with increasingpre-set Ievels of reduction. This is visualized by the help of the predicted crank angle degree at which auto ignition in the end gas of the engine occurs.The reduced mechanism is used for investigation of the modeling of the auto ignitionin the SI engines. The effects of engine operator parameters such as compression ratio, spark advance, fuel equivalence ratio and engine speed on autoignition onsettime have been studied.This work shows that it is possible to achieve a simplified reaction mechanism withgood agreement to the original mechanism by the reduction method. Fundamental knowledge about the detailed mechanism is not necessary to apply the method. Theprocedure used for reduction is fully automatic and provides a fast technique togenerate the problem oriented reduced mechanisms.

Download or read book Combustion Modeling of a Two Cylinder Cycle Reciprocating Engine written by Victor Chrjapin and published by . This book was released on 1984 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt: A simple mathematical model was developed to simulate the closed portion of the cycle for a quiescent chamber compression ignition engine using the assumption of perfect gases and the first law of thermodynamics. Various input parameters were used in trend analysis to check the model. The output from the computer program was compared to test data from a four inch bore, open chamber semi quiescent diesel engine run at the Sloan Test Laboratory. This computer model was then modified to simulate the expansion stroke of a newly developed, two cylinder cycle reciprocating engine. The model was then run to determine the optimum point of fuel injection for the new engine.

Download or read book Combustion Engines Development written by Günter P. Merker and published by Springer Science & Business Media. This book was released on 2011-09-24 with total page 660 pages. Available in PDF, EPUB and Kindle. Book excerpt: Combustion Engines Development nowadays is based on simulation, not only of the transient reaction of vehicles or of the complete driveshaft, but also of the highly unsteady processes in the carburation process and the combustion chamber of an engine. Different physical and chemical approaches are described to show the potentials and limits of the models used for simulation.