Download or read book Computational Fluid Dynamics Applied to Two stroke Engine Scavenging written by M. E. G. Sweeney and published by . This book was released on 1985 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Modeling of a Two stroke Engine Scavenging Cycle with KIVA 2x3 written by Douglas J. Lofgren and published by . This book was released on 1995 with total page 382 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Computations of a Two Stroke Engine Cylinder and Port Scavenging Flows written by P. H. Epstein and published by . This book was released on 1991 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: A modification of the computational fluid dynamics code KIVA-II is presented that allows computations to be made in complex engine geometries. An example application is given in which three versions of KIVA-II are run simultaneously. Each version considers a separate block of the computational domain, and the blocks exchange boundary condition information with each other at their common interfaces. The use of separate blocks permits the connectedness of the overall computational domain to change with time. The scavenging flow in the cylinder, transfer pipes (ports), and exhaust pipe of a ported two-stroke engine with a moving piston was modeled in this way. Results are presented for three engine designs that differ only in the angle of their boost ports. Reprints.
Download or read book The Basic Design of Two Stroke Engines written by Gordon P Blair and published by SAE International. This book was released on 1990-01-01 with total page 694 pages. Available in PDF, EPUB and Kindle. Book excerpt: This informative publication is a hands-on reference source for the design of two-stroke engines. The state-of-the-art is presented in such design areas as unsteady gas dynamics, scavenging, combustion, emissions and silencing. In addition, this comprehensive publication features a computer program appendix of 28 design programs, allowing the reader to recreate the applications described in the book. The Basic Design of Two-Stroke Engines offers practical assistance in improving both the mechanical and performance design of this intriguing engine. Organized into eight information-packed chapters, contents of this publication include: Introduction to the Two-Stroke Engine Gas Flow Through Two-Stroke Engines Scavenging the Two-Stroke Engine Combustion in Two-Stroke Engines Computer Modelling of Engines Empirical Assistance for the Designer Reduction of Fuel Consumption and Exhaust Emissions Reduction of Noise Emission from Two-Stroke Engines
Download or read book Two Stroke Cycle Engine written by JohnB. Heywood and published by Routledge. This book was released on 2017-11-01 with total page 425 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book addresses the two-stroke cycle internal combustion engine, used in compact, lightweight form in everything from motorcycles to chainsaws to outboard motors, and in large sizes for marine propulsion and power generation. It first provides an overview of the principles, characteristics, applications, and history of the two-stroke cycle engine, followed by descriptions and evaluations of various types of models that have been developed to predict aspects of two-stroke engine operation.
Download or read book An Investigation of the Flow Through Check Valves in a Uniflowtype Two stroke Engine written by Iain Kyle Fraser and published by . This book was released on 2010 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: An innovative two-stroke engine has been under development at Queen's University. Traditional crankcase-scavenged two-stroke engines have laboured to meet emissions standards and achieve fuel economy comparable to four-stroke engines. The engine in question makes use of a modified Eaton-type supercharger to enable air-only scavenging, with this it utilizes direct fuel injection which occurs after the exhaust ports have closed, these two elements combine to eliminate the combustion of lubricating oil in the cylinder and short-circuiting of the fuel-air mixture into the exhaust. By having passive check valves in the cylinder head to regulate the inflow of scavenging air, and exhaust ports located near bottom centre this results in a top-down uniflow-scavenged configuration, as well as retaining a simplistic engine design. In the two-stroke cycle, using the intake charge to replace the combustion products with fresh air during scavenging is critical to engine performance. In this engine the scavenging charge is produced by a set of passive intake check valves, and because of this the scavenging timing is important. These valves are important because they govern the volume of combustion products that are forced out of the cylinder during scavenging, and hence the efficiency of combustion in the engine. To evaluate the engine design criteria, a validated computational fluid dynamic (CFD) model was used to offer insight into how the in-cylinder flow developed during scavenging. The CFD model of this engine was used to test different check-valve geometries to see how they affect the scavenging flow in the cylinder. The goal of this is to assist in entraining more of the combustion products which would result in more being exhausted from the cylinder. A more favourable design was found, and a design produced to be taken onto the next step of testing.
Download or read book Numerical Modelling written by Peep Miidla and published by BoD – Books on Demand. This book was released on 2012-03-23 with total page 422 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book demonstrates applications and case studies performed by experts for professionals and students in the field of technology, engineering, materials, decision making management and other industries in which mathematical modelling plays a role. Each chapter discusses an example and these are ranging from well-known standards to novelty applications. Models are developed and analysed in details, authors carefully consider the procedure for constructing a mathematical replacement of phenomenon under consideration. For most of the cases this leads to the partial differential equations, for the solution of which numerical methods are necessary to use. The term Model is mainly understood as an ensemble of equations which describe the variables and interrelations of a physical system or process. Developments in computer technology and related software have provided numerous tools of increasing power for specialists in mathematical modelling. One finds a variety of these used to obtain the numerical results of the book.
Download or read book Modeling of Scavenging and Plugging in a Twin cylinder Two Stroke Engine Using CFD written by Yangbing Zeng and published by . This book was released on 2003 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurements of Flows During Scavenging in a Two stroke Engine written by H. Sean Hilbert and published by . This book was released on 1991 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book I C Engines And Combustion written by and published by Allied Publishers. This book was released on with total page 578 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Numerical Simulation of Turbulent Flow Inside the Cylinder of a New Two stroke Grail Engine Design written by Shoeb Ahmed Syed and published by . This book was released on 2015 with total page 123 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work presents a novel way of implementing Autodesk computational fluid dynamics (CFD) software for internal combustion (IC) engine application. The main objective of this research is to develop a high fidelity simulation methodology for a state of art hybrid two-stroke Grail engine and to investigate the complex motion of piston and intake valve of the engine. Grail engine design is unique due to presence of single intake valve within the piston itself. Thus, the intake valve moves with the piston which makes the motion much more complex to study in the present work. Since the efficiency of combustion and the production of pollutants in the internal combustion engine are strongly dependent on the turbulent flow field in the engine cylinder. The focus is put in the analysis of the in-cylinder flow field dynamics and turbulence within the cylinder and through the complete engine cycle in the initial stages of development of the Grail engine. Finally, the scavenging process of the Grail engine with mixing and scavenging efficiency was also numerically investigated. In most engines, turbulent kinetic energy (TKE) is almost exclusively generated during the intake stroke and enhances greatly the mixing of air and fuel to give better mixing during compression stoke. The 3-D simulation of the flow through the engine is performed by using finite element method. Autodesk Reynold's-averaged Navier-Stokes (RANS) K ?? model is used to perform the calculations of the flow. The performance and possibilities that Autodesk CFD gives for this kind of application is evaluated.
Download or read book Internal Combustion Engineering Science Technology written by P.M. Weaving and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 874 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sir Diarmuid Downs, CBE, FEng, FRS Engineering is about designing and making marketable artefacts. The element of design is what principally distinguishes engineering from science. The engineer is a creator. He brings together knowledge and experience from a variety of sources to serve his ends, producing goods of value to the individual and to the community. An important source of information on which the engineer draws is the work of the scientist or the scientifically minded engineer. The pure scientist is concerned with knowledge for its own sake and receives his greatest satisfaction if his experimental observations fit into an aesthetically satisfying theory. The applied scientist or engineer is also concerned with theory, but as a means to an end. He tries to devise a theory which will encompass the known experimental facts, both because an all embracing theory somehow serves as an extra validation of the facts and because the theory provides us with new leads to further fruitful experimental investigation. I have laboured these perhaps rather obvious points because they are well exemplified in this present book. The first internal combustion engines, produced just over one hundred years ago, were very simple, the design being based on very limited experimental information. The current engines are extremely complex and, while the basic design of cylinder, piston, connecting rod and crankshaft has changed but little, the overall performance in respect of specific power, fuel economy, pollution, noise and cost has been absolutely transformed.
Download or read book Internal Combustion Engines written by Giancarlo Ferrari and published by Società Editrice Esculapio. This book was released on 2022-07-21 with total page 701 pages. Available in PDF, EPUB and Kindle. Book excerpt: Internal combustion engines are among the most fascinating and ingenious machines which, with their invention and continuous development, have positively influenced the industrial and social history during the last century, especially by virtue of the role played as propulsion technology par excellence used in on-road private and commercial transportation. Nowadays, the growing attention towards the de-carbonization opens up new scenarios, but IC engines will continue to have a primary role in multiple sectors: automotive, marine, offroad machinery, mining, oil & gas and rail, power generation, possibly with an increasing use of non-fossil fuels. The book is organized in monothematic chapters, starting with a presentation of the general and functional characteristics of IC engines, and then dwelling on the details of the fluid exchange processes and the definition of the layout of intake and exhaust systems, obviously including the supercharging mechanisms, and continue with the description of the injection and combustion processes, to conclude with the explanation of the formation, control and reduction of pollutant emissions and radiated noise.
Download or read book A Computer Simulation of the Scavenging Flow in a Two stroke Engine written by Peter Epstein and published by . This book was released on 1990 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Design and Simulation of Two Stroke Engines written by Gordon Blair and published by SAE International. This book was released on 1996-02-01 with total page 656 pages. Available in PDF, EPUB and Kindle. Book excerpt: Design and Simulation of Two-Stroke Engines is a unique hands-on information source. The author, having designed and developed many two-stroke engines, offers practical and empirical assistance to the engine designer on many topics ranging from porting layout, to combustion chamber profile, to tuned exhaust pipes. The information presented extends from the most fundamental theory to pragmatic design, development, and experimental testing issues. Chapters cover: Introduction to the Two-Stroke Engine Combustion in Two-Stroke Engines Computer Modeling of Engines Reduction of Fuel Consumption and Exhaust Emissions Reduction of Noise Emission from Two-Stroke Engines and more
Download or read book New Generation of Two St written by Pierre Duret and published by Editions OPHRYS. This book was released on with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Modeling and Control of EGR on Marine Two Stroke Diesel Engines written by Xavier Llamas and published by Linköping University Electronic Press. This book was released on 2018-02-20 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: The international marine shipping industry is responsible for the transport of around 90% of the total world trade. Low-speed two-stroke diesel engines usually propel the largest trading ships. This engine type choice is mainly motivated by its high fuel efficiency and the capacity to burn cheap low-quality fuels. To reduce the marine freight impact on the environment, the International Maritime Organization (IMO) has introduced stricter limits on the engine pollutant emissions. One of these new restrictions, named Tier III, sets the maximum NOx emissions permitted. New emission reduction technologies have to be developed to fulfill the Tier III limits on two-stroke engines since adjusting the engine combustion alone is not sufficient. There are several promising technologies to achieve the required NOx reductions, Exhaust Gas Recirculation (EGR) is one of them. For automotive applications, EGR is a mature technology, and many of the research findings can be used directly in marine applications. However, there are some differences in marine two-stroke engines, which require further development to apply and control EGR. The number of available engines for testing EGR controllers on ships and test beds is low due to the recent introduction of EGR. Hence, engine simulation models are a good alternative for developing controllers, and many different engine loading scenarios can be simulated without the high costs of running real engine tests. The primary focus of this thesis is the development and validation of models for two-stroke marine engines with EGR. The modeling follows a Mean Value Engine Model (MVEM) approach, which has a low computational complexity and permits faster than real-time simulations suitable for controller testing. A parameterization process that deals with the low measurement data availability, compared to the available data on automotive engines, is also investigated and described. As a result, the proposed model is parameterized to two different two-stroke engines showing a good agreement with the measurements in both stationary and dynamic conditions. Several engine components have been developed. One of these is a new analytic in-cylinder pressure model that captures the influence of the injection and exhaust valve timings without increasing the simulation time. A new compressor model that can extrapolate to low speeds and pressure ratios in a physically sound way is also described. This compressor model is a requirement to be able to simulate low engine loads. Moreover, a novel parameterization algorithm is shown to handle well the model nonlinearities and to obtain a good model agreement with a large number of tested compressor maps. Furthermore, the engine model is complemented with dynamic models for ship and propeller to be able to simulate transient sailing scenarios, where good EGR controller performance is crucial. The model is used to identify the low load area as the most challenging for the controller performance, due to the slower engine air path dynamics. Further low load simulations indicate that sensor bias can be problematic and lead to an undesired black smoke formation, while errors in the parameters of the controller flow estimators are not as critical. This result is valuable because for a newly built engine a proper sensor setup is more straightforward to verify than to get the right parameters for the flow estimators.
