by National Aeronautics and Space Administration, Scientific and Technical Information Office, For sale by the National Technical Information Service] in Washington, D.C, [Springfield, Va .
Written in English
|Statement||A.T. Ganji and R.F. Sawyer ; prepared for Lewis Research Center under grant NSG-3028|
|Series||NASA contractor report -- 3230|
|Contributions||Sawyer, R. F, United States. National Aeronautics and Space Administration. Scientific and Technical Information Office, Lewis Research Center|
|The Physical Object|
|Pagination||v,  p. :|
|Number of Pages||210|
Controlling Flame Stability in a High-Speed Combustor through Pressure Gradients. Isaac G. Boxx; 6 January Recommended. Characterization of the Temperature Field Structure in Turbulent Premixed Jet Flames. Prediction of Turbulent Premixed Combustion by a Hybrid Turbulence Model. Reduce Pollutants - less NOx if velocities are large (for short residence times) and fuel-air mixing is fast and lean Avoid growl - combustion oscillations in gas turbines, rockets, due to poor flame anchoring Challenge: to model the turbulent reaction rate for non-premixed, premixed and partially-premixed combustionFile Size: 1MB. Flow Turbulence and Scalar Transport in Highly Turbulent Premixed Flames; Turbulence-Soot Interaction J.A., "Flame Structure and Combustion Dynamics in a Premixed Dual-Mode Scramjet Combustor from Fluorescence Imaging", Journal of Propulsion and Power, , 35(3), Fraction and Scalar Dissipation Rates in Turbulent Non-premixed. Flow, Turbulence and Combustion provides a global forum for the publication of original and innovative research results that contribute to the solution of fundamental and applied problems encountered in single-phase, multi-phase and reacting flows, in both idealized and real systems. The scope of coverage encompasses topics in fluid dynamics, scalar transport, multi-physics interactions .
Tradeoff: low NOx (partially premixed) versus combustion instabilities (growl Biggest driver in jet engine industry is still NOx - gas turbine combustor Premixed and non-premixed flamelets Rosenberg, Driscoll Comb Flame , Turbulence intensity Turbulence integral scale lI / d flame thick flamelets corregated flamelets. 1. Premixed and diffusion ames ﬂ 2. Explosion, deﬂagration, and detonation 3. The onset of detonation B. Detonation phenomena C. Hugoniot relations and the hydrodynamic theory of detonations 1. Characterization of the Hugoniot curve and the uniqueness of the C–J point 2. ofhydrocarbon fuel combustion that relate directly to the fonnation ofpollutants or to the control of emissions. Questions of flame stability, detonations, and several other important aspects ofcombustion science are beyond the scope ofthe present discussion and will not be treated. Specific pollution control problems will be addressed in detail. In this study, the combustion instability and emission characteristics of flames of different H 2 /CH 4 compositions were investigated in a partially premixed model gas turbine combustor.
They deal with the three distinct cases of flames in premixed, nonpremixed, and partially-premixed fuel + oxidant gases. At the end is given a valuable two-page Epilogue recapitulating the restrictions under which one can combine the methodologically disparate turbulence theory on one hand and the asymptotic flame theory on the other. Predictions of reactive scalar ﬁelds and pollutant formation in turbulent jet diffusion ﬂames Combustion modeling of gas turbines, burners, and direct injection diesel engines Concluding remarks 4 Partially premixed turbulent combustion Introduction Lifted turbulent jet diffusion ﬂames PDF | This article reports a high repetition rate KHz level laser diagnostics of highly turbulent flow over a backward facing step. A major focus is | Find, read and cite all the research you. The development of better laser-based experimental methods and the fast rise in computer power has created an unprecedented shift in turbulent combustion research. The range of species and quantities measured and the advent of kHz-level planar diagnostics are now providing great insights in important phenomena and applications such as local and global extinction, pollutants, and .