Download or read book Numerical Investigation of Jets in a Reacting Crossflow written by and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Numerical Investigation of Jets in a Reacting Crossflow written by Hanan Urson and published by . This book was released on 1999 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The mixing of air jets into hot, fuel-rich mixture is an integral part of many staged combustion applications. This study concentrates on the exhaust system of an electric arc steelmelting furnace where high concentrations of carbon monoxide (CO) and hydrogen (H2) are present. A three dimensional numerical code featuring two combustion models has been used to predict those emissions for various jet to cross-stream mass flow ratios and a comparison with experimental CO was done. The results showed that both models were unable to predict CO and H2 emissions for the conditions investigated. Thorough examination of the non-premixed flamelet revealed that the turbulent tune scale was much faster than the chemical time scale, thus, collapsing one of the requirements of this model. With the eddy dissipation model, the CO and H2 concentrations were severely underpredicted and convergence problem occurred when dissimilar chemical kinetic rates for CO and H 2 were incorporated.
Download or read book Numerical Investigation of Reacting Jet in crossflow at High Pressure written by Bernhard Stiehl and published by . This book was released on 2020 with total page 105 pages. Available in PDF, EPUB and Kindle. Book excerpt: Simulated jet trajectories were in good agreement with the data and were described by an elliptic curvature to compensate for the poor far-field prediction of existing correlations. Non-premixed fuel-air condition in the axial fuel line resulted in an ignition point further downstream and reduced reaction rates. This delay can affect a NO benefit paired with relatively rich headend equivalence ratio, reducing the residence time of the reacting axial jet without exceeding spatial limitations. Dependencies of axial NO emission on the key influence parameters temperature, pressure and residence time were proposed.
Download or read book Manipulation and Control of Jets in Crossflow written by Ann R. Karagozian and published by Springer. This book was released on 2014-05-04 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fundamental Non-Reactive Jets in Crossflow and Other Jet Systems; Background on Modeling, Dynamical Systems, and Control; Reactive Jets in Crossflow and Multiphase Jets; Controlled Jets in Crossflow and Control via Jet Systems;
Download or read book Flow Field and Mixing Characteristics of Multiple Reacting Jets in Vitiated Crossflow written by George M. Lapaan and published by . This book was released on 2014 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Experimental and Numerical Investigation of a Turbulent Round Jet Issuing Into an Unsteady Crossflow written by 夏麗萍 and published by Open Dissertation Press. This book was released on 2017-01-26 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "An Experimental and Numerical Investigation of a Turbulent Round Jet Issuing Into an Unsteady Crossflow" by 夏麗萍, Liping, Xia, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. DOI: 10.5353/th_b3123789 Subjects: Unsteady flow (Aerodynamics) Jets - Fluid dynamics
Download or read book Numerical Investigation of Two Streamwise Turbulent Jets in a Crossflow written by Tedi G. Ohanian and published by . This book was released on 2002 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Numerical Investigation of an Impinging Jet in a Crossflow written by Cesar Diaz and published by . This book was released on 1997 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt: A numerical investigation of a jet impinging perpendicularly to a ground plane in the presence of crossflow was concluded using INCA, a finite-volume Navier-Stokes equations code.
Download or read book Effect of Jet Injection Angle and Number of Jets on Mixing and Emissions from a Reacting Crossflow at Atmospheric Pressure written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-15 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: The mixing of air jets into hot, fuel-rich products of a gas turbine primary zone is an important step in staged combustion. Often referred to as "quick quench," the mixing occurs with chemical conversion and substantial heat release. An experiment has been designed to simulate and study this process, and the effect of varying the entry angle (0 deg, 22.5 deg and 45 deg from normal) and number of the air jets (7, 9, and 11) into the main flow, while holding the jet-to-crossflow mass-low ratio, MR, and momentum-flux ratio, J, constant (MR = 2.5;J = 25). The geometry is a crossflow confined in a cylindrical duct with side-wall injection of jets issuing from orifices equally spaced around the perimeter. A specially designed reactor, operating on propane, presents a uniform mixture to a module containing air jet injection tubes that can be changed to vary orifice geometry. Species concentrations of O2, CO, CO2, NO(x) and HC were obtained one duct diameter upstream (in the rich zone), and primarily one duct radius downstream. From this information, penetration of the jet, the spatial extent of chemical reaction, mixing, and the optimum jet injection angle and number of jets can be deduced. St.John, D. and Samuelsen, G. S. Glenn Research Center NASA/CR-2000-209949, E-12202, NAS 1.26:209949
Download or read book An Experimental and Numerical Investigation of a Turbulent Round Jet Issuing Into an Unsteady Crossflow written by Liping Xia and published by . This book was released on 1998 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Optimization of Jet Mixing Into a Rich Reacting Crossflow written by M. Y. Leong and published by . This book was released on 1997 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Numerical Investigation of Slanted Slot Dilution Jet Mixing with a Cylindrical Crossflow written by Shane A. Moeykens and published by . This book was released on 1991 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Numerical Investigation of Variable Momentum Flux and Density Ratios on Confined Jets in Crossflow written by and published by . This book was released on 2016 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt: A full unsteady Navier Stokes Equation (NSE) solver (known as the laminar model in FLUENT) is used to simulate a confined jet in crossflow (JICF) with Reynolds numbers (Re) in the range 287-2478. Reynolds Averaged Navier Stokes (RANS) equations are used to simulate JICF with Re in the range 4930-20000. Velocity ratios range between 0.84-3.15. Results of using the SST [lower case kappa] -- [lower case omega] or Realizable [lower case kappa] -- [lower case epsilon] are presented. Comparison to experimental data provided by the Air Force Research Lab shows that both the full NSE and RANS equations compare well with experimental data. The SST [lower case kappa] -- [lower case omega] predicts higher velocities than the Realizable model. The full Navier stokes simulation captures the major JICF vortical structures including the Counter-rotating Vortex Pair (CVP), upstream and downstream shear layers, horseshoe vortices, and hanging vortices. Many of these vortical details are lost in the RANS simulation. Two parametric studies on varying density ratio and momentum flux ratio are conducted. Varying density ratio is found to have little to no effect on the jet trajectory in the near-jet region. A lower density ratio leads to a higher Re which increases unsteadiness and turbulence which leads to improved mixing. Increasing momentum flux ratio generally increases jet penetration. However, a JICF with a larger boundary layer can penetrate deeper into the crossflow than a thinner boundary layer JICF even if the momentum flux ratio is smaller. Contributions of this work include providing additional simulation data for JICF at the presented flow conditions as well as validation of two RANS turbulence models and a full Navier Stokes solver.
Download or read book Scramjet Combustion written by Gautam Choubey and published by Butterworth-Heinemann. This book was released on 2022-07-08 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: Scramjet Combustion explores the development of a high-speed scramjet engine operating in the supersonic/hypersonic range for various air and space transport applications. The book explains the basic structure, components, working cycle, and the relevant governing equations in a clear manner that speaks to both advanced and more novice audiences. Particular attention is paid to efficient air–fuel combustion, looking at both the underlying fundamentals of combustion as well strategies for obtaining optimum combustion efficiency. Methods for reaching the chemically correct air–fuel ratio, subsequent flame, and combustion stabilization as air enters at supersonic speed are also outlined. Further, it includes the continuous on-going efforts, innovations, and advances with respect to the design modification of scramjet combustors, as well as different strategies of fuel injections for obtaining augmented performance while highlighting the current and future challenges. - Outlines the fundamentals of scramjet engines including their basic structure and components, working cycle, governing equations, and combustion fundamentals affecting the combustion and mixing processes - Presents new design modifications of scramjet combustors and different fuel injection strategies including combined fuel injection approaches - Discusses core topics such as chemical kinetics in supersonic flow, fuel–air mixing methods, strategies for combating combustion difficulties, and subsequent flame and combustion stabilization that can be applied to scramjets - Describes the pedagogy for computational approaches in simulating supersonic flows
Download or read book NAS Technical Summaries March 1993 February 1994 written by Ames Research Center and published by . This book was released on 1995 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Modeling and Simulation of Turbulent Mixing and Reaction written by Daniel Livescu and published by Springer Nature. This book was released on 2020-02-19 with total page 273 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book highlights recent research advances in the area of turbulent flows from both industry and academia for applications in the area of Aerospace and Mechanical engineering. Contributions include modeling, simulations and experiments meant for researchers, professionals and students in the area.
Download or read book Jet Mixing in a Reacting Cylindrical Crossflow written by M. Y. Leong and published by . This book was released on 1995 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:
