Download or read book Simulation of Fuel air Mixing and Combustion in a Trapped vortex Combustor written by Christopher Stone and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mixing and Combustion in Vortex Dominated Combustors with Distributed Air and Fuel Injection written by and published by . This book was released on 1998 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Measurements of temperature, velocity and emissions were performed in two trapped vortex combustor configurations, and several strategies for improving key performance metrics (e.g., circumferential uniformity in temperature and NOx emissions) were examined. The measurements show that introducing swirl with the primary cavity air reduces NOx emissions, extends the Lean Blow Out (LBO) limit and decreases circumferential non- uniformity in the temperature. With the inner-cavity configuration, LBO values as low as 0. 1 and single-digit NOx were achieved. With the outer-cavity configuration, LBO occurred at 0.3. Computations performed indicate that the cavity vortex has a toroidal donut shape, and has large scale dynamics. Distributed micro-scale fuel injectors were fabricated as part of this effort, and have the potential for generating an uniform dispersion of small droplets desirable for improved combustion characteristic & Temperature-actuated bi-morph valves were also develop%d for control of dilution air and local stoichiometry.
Download or read book Measurement and Computation of Supersonic Flow in a Lobed Diffuser Mixer for Trapped Vortex Combustors written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-03 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: The trapped vortex combustor (TVC) pioneered by Air Force Research Laboratories (AFRL) is under consideration as an alternative to conventional gas turbine combustors. The TVC has demonstrated excellent operational characteristics such as high combustion efficiency, low NO(x) emissions, effective flame stabilization, excellent high-altitude relight capability, and operation in the lean-burn or rich burn-quick quench-lean burn (RQL) modes of combustion. It also has excellent potential for lowering the engine combustor weight. This performance at low to moderate combustor mach numbers has stimulated interest in its ability to operate at higher combustion mach number, and for aerospace, this implies potentially higher flight mach numbers. To this end, a lobed diffuser-mixer that enhances the fuel-air mixing in the TVC combustor core was designed and evaluated, with special attention paid to the potential shock system entering the combustor core. For the present investigation, the lobed diffuser-mixer combustor rig is in a full annular configuration featuring sixfold symmetry among the lobes, symmetry within each lobe, and plain parallel, symmetric incident flow. During hardware cold-flow testing, significant discrepancies were found between computed and measured values for the pitot-probe-averaged static pressure profiles at the lobe exit plane. Computational fluid dynamics (CFD) simulations were initiated to determine whether the static pressure probe was causing high local flow-field disturbances in the supersonic flow exiting the diffuser-mixer and whether shock wave impingement on the pitot probe tip, pressure ports, or surface was the cause of the discrepancies. Simulations were performed with and without the pitot probe present in the modeling. A comparison of static pressure profiles without the probe showed that static pressure was off by nearly a factor of 2 over much of the radial profile, even when taking into account potential axial displacement of the prob
Download or read book Experimental and Computational Study of Trapped Vortex Combustor Sector Rig with Tri Pass Diffuser written by R. C. Hendricks and published by BiblioGov. This book was released on 2013-07 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Trapped Vortex Combustor (TVC) potentially offers numerous operational advantages over current production gas turbine engine combustors. These include lower weight, lower pollutant emissions, effective flame stabilization, high combustion efficiency, excellent high altitude relight capability, and operation in the lean burn or RQL modes of combustion. The present work describes the operational principles of the TVC, and extends diffuser velocities toward choked flow and provides system performance data. Performance data include EINOx results for various fuel-air ratios and combustor residence times, combustion efficiency as a function of combustor residence time, and combustor lean blow-out (LBO) performance. Computational fluid dynamics (CFD) simulations using liquid spray droplet evaporation and combustion modeling are performed and related to flow structures observed in photographs of the combustor. The CFD results are used to understand the aerodynamics and combustion features under different fueling conditions. Performance data acquired to date are favorable compared to conventional gas turbine combustors. Further testing over a wider range of fuel-air ratios, fuel flow splits, and pressure ratios is in progress to explore the TVC performance. In addition, alternate configurations for the upstream pressure feed, including bi-pass diffusion schemes, as well as variations on the fuel injection patterns, are currently in test and evaluation phases.
Download or read book Experimental and Computational Study of Trapped Vortex Combustor Sector Rig with Tri Pass Diffuser written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-08-20 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Trapped Vortex Combustor (TVC) potentially offers numerous operational advantages over current production gas turbine engine combustors. These include lower weight, lower pollutant emissions, effective flame stabilization, high combustion efficiency, excellent high altitude relight capability, and operation in the lean burn or RQL modes of combustion. The present work describes the operational principles of the TVC, and extends diffuser velocities toward choked flow and provides system performance data. Performance data include EINOx results for various fuel-air ratios and combustor residence times, combustion efficiency as a function of combustor residence time, and combustor lean blow-out (LBO) performance. Computational fluid dynamics (CFD) simulations using liquid spray droplet evaporation and combustion modeling are performed and related to flow structures observed in photographs of the combustor. The CFD results are used to understand the aerodynamics and combustion features under different fueling conditions. Performance data acquired to date are favorable compared to conventional gas turbine combustors. Further testing over a wider range of fuel-air ratios, fuel flow splits, and pressure ratios is in progress to explore the TVC performance. In addition, alternate configurations for the upstream pressure feed, including bi-pass diffusion schemes, as well as variations on the fuel injection patterns, are currently in test and evaluation phases. Hendricks, R. C. and Shouse, D. T. and Roquernore, W. M. and Burrus, D. L. and Duncan, B. S. and Ryder, R. C. and Brankovic, A. and Liu, N.-S. and Gallagher, J. R. and Hendricks, J. A. Glenn Research Center NASA/TM-2004-212507, E-12899-1
Download or read book Advanced Combustion and Aerothermal Technologies written by Nick Syred and published by Springer. This book was released on 2007-10-16 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt: Here readers will find a summary of proceedings at a highly important NATO workshop. The ARW Advanced Combustion and Aerothermal Technologies: Environmental Protection and Pollution Reductions, was held in Kiev, May 2006. The workshop was co-directed by Profs. N. Syred and A.Khalatov, winners of the NATO Scientific Prize 2002, and was organized by the Institute of Thermophysics (Ukraine) and Cardiff University, UK. The primary workshop objective was to assess the existing knowledge on advanced combustion and aerothermal technologies providing reduced environmental impact.
Download or read book Advances in Combustion Technology written by Debi Prasad Mishra and published by CRC Press. This book was released on 2022-10-24 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: This edited volume on combustion technology covers recent developments and provides a broad perspective of the key challenges in this emerging field. Divided into two sections, the first one covers micro-combustion systems, hydrogen combustors, combustion systems for gas turbines and IC engines, coal combustors for power plants and gasifier systems. The second section focusses on combustion systems pertaining to aerospace including supersonic combustors, rocket engines and gel propellant combustion. Issues related to energy producing devices in power generation, process industries and aerospace vehicles and efficient and eco-friendly combustion technologies are also explained. Features: Provides comprehensive coverage of recent advances in combustion technology Explains definite concepts about the design and development in combustion systems Captures developments relevant for the aerospace area including gel propellant, aluminium-based propellants, gasification and gas turbines Aims to introduce the combustion system in different industries Expounds novel combustion systems with reference to pertinent renewable technologies This book is aimed at researchers and graduate students in chemical, mechanical and aerospace engineering, energy and environmental engineering, and thermal engineering. This book is also aimed at practicing engineers and decision makers in industry and research labs, and petroleum utilization.
Download or read book Numerical Simulation of the Flow and Fuel air Mixing in an Axisymmetric Piston cylinder Arrangement written by and published by . This book was released on 1982 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Coarse Grained Simulation and Turbulent Mixing written by Fenando F. Grinstein and published by Cambridge University Press. This book was released on 2016-06-30 with total page 481 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reviews our current understanding of the subject. For graduate students and researchers in computational fluid dynamics and turbulence.
Download or read book Proceedings of the 1st International Conference on Fluid Thermal and Energy Systems written by Sudev Das and published by Springer Nature. This book was released on 2024-01-17 with total page 840 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book comprises the proceedings of the 1st International Conference on Fluid, Thermal and Energy Systems. The contents of this book focus on phase change heat transfer, advanced energy systems, separated flows, turbulence and multi-phase modeling, computational fluid flow and heat transfer, thermal energy storage systems, integrated energy systems, nuclear thermal hydraulics, heat transfer in nanofluids, etc. This book serves as a useful reference to researchers, academicians, and students interested in the broad field of thermo-fluid science and engineering.
Download or read book Enhanced Vortex Stability of Trapped Vortex Combustor tvc written by Sony Chindada and published by LAP Lambert Academic Publishing. This book was released on 2011-01 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: The unsteady flow in aircraft and industrial combustors limits fuel-lean operation and influences flame-stability characteristics. Flame instabilities in the combustor can lead to significant performance degradation, reduced combustion efficiencies, unburned hydrocarbons (UHC), possible blow out, structural vibration, lift-off and even catastrophic failure. In Trapped Vortex Combustor (TVC), flame is independent of the main flow and therefore potential disturbances in the main air flow do not affect the stability of the flame. Combustion stability in TVC is achieved using recirculation zones so as to provide continuous source of ignition by mixing hot products and burning gases with incoming fuel and air. Swirl vanes, bluff bodies, and rearward facing steps are commonly used methods to establish recirculation zones for flame stabilization.
Download or read book Vortex Combustor for Low NOx Emissions when Burning Lean Premixed High Hydrogen Content Fuel written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A trapped vortex combustor. The trapped vortex combustor is configured for receiving a lean premixed gaseous fuel and oxidant stream, where the fuel includes hydrogen gas. The trapped vortex combustor is configured to receive the lean premixed fuel and oxidant stream at a velocity which significantly exceeds combustion flame speed in a selected lean premixed fuel and oxidant mixture. The combustor is configured to operate at relatively high bulk fluid velocities while maintaining stable combustion, and low NOx emissions. The combustor is useful in gas turbines in a process of burning synfuels, as it offers the opportunity to avoid use of diluent gas to reduce combustion temperatures. The combustor also offers the possibility of avoiding the use of selected catalytic reaction units for removal of oxides of nitrogen from combustion gases exiting a gas turbine.
Download or read book Numerical Simulation of Vortex Combustion for Various Air fuel Configurations written by Jumari Porman and published by . This book was released on 2015 with total page 41 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Large eddy Simulation of Fuel air Mixing and Chemical Reactions in Swirling Flow Combustor written by S. Menon 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 Proceedings of the Spring Technical Conference of the ASME Internal Combustion Engine Division written by American Society of Mechanical Engineers. Internal Combustion Engine Division. Spring Technical Conference and published by . This book was released on 2001 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Influence of Injector Geometry on Fuel air Mixing and Combustion Performance of a Model Combustor written by Leonel Arellano-Ochoa and published by . This book was released on 2000 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Numerical Simulation of the Air and Fuel Mixing Process in Fuel Injected Engines Using Discrete Vortex Dynamics written by Asuquo Bassey Ebiana and published by . This book was released on 1990 with total page 646 pages. Available in PDF, EPUB and Kindle. Book excerpt:
