Propellant combustion phenomena during rapid depressurization Final report
Idealized combustion model in which exothermic or endothermic reactions are permitted at or very near solid-gas interfaces
Capener, E. L.↗
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A theoretical and experimental study of propellant combustion phenomena during rapid depressurization Final report
Modified solid propellant combustion model for steady state analyses of burning rate and flame temperature
Kier, R. J.↗
Low frequency instability - A comparison of theory and experiment.
Solid propellant combustion instability models describing combustion zone dynamics applied to acoustic and nonacoustic instability in LF regime
Beckstead, M. W.↗
Nonlinear solid propellant burning rate behavior during abrupt pressure excursions.
Solid propellant burning rate behavior during abrupt environmental pressure excursions, using transient combustion model
Marxman, G. A.↗
Secondary flow induced by a transverse resonant acoustic field in a circular duct.
Finite amplitude standing transverse resonant acoustic field effects upon flow behavior of viscous fluid in cylindrical enclosure to acoustically model combustion instability
Hribar, A. E.↗
An analytical study of solid propellant combustion during rapid depressurization Final report
Solid propellant combustion model modification to contain two heat release zones in gas phase
Wooldridge, C. E.↗
Research on combustion instability in liquid propellant rockets
Nonlinear combustion instabilities in liquid propellant rockets, considering various combustion models and experimental techniques
Crocco, L.↗
Photographic study of solid propellants burning in an acceleration environment
Photographic study of acceleration and pressure effects on Al agglomerates and combustion processes on solid propellant surface, describing pit growth by combustion model
Baker, K. L.↗
Role of condensed phase details in the oscillatory combustion of composite propellants
The response functions of composite propellants are theoretically derived, including explicitly the pressure-dependent degradation term in the condensed phase, hypothesizing that the overall rate-limiting reactions are in the relatively low temperature condensed phase. The method of 'inner' and 'outer' expansions with the reduced activation energy as the singular perturbation parameter has been employed. The results cover subsurface reactions with and without surface reactions, adiabatic and uniform-combustion models for the quasi-steady gas phase processes. The response functions display several experimentally observed features like dependence on mean pressure and the instability behavior of some 'zero-n' propellants.
Kumar, R. N.↗
Fundamentals of Gas Turbine combustion
Combustion problems and research recommendations are discussed in the areas of atomization and vaporization, combustion chemistry, combustion dynamics, and combustion modelling. The recommendations considered of highest priority in these areas are presented.
Gerstein, M.↗
Simulation of liquid propellant rocket engine combustion instabilities
A simulation technique for studying the high frequency combustion instabilities of liquid propellant rocket engines has been developed and used to investigate various aspects of instability phenomena. Of importance was investigation of the significance of the method of coupling the combustion and the gas dynamics of the system. Two coupling processes were studied: linear response of the combustion process to pressure fluctuations, and the nature of the resulting instabilities; and nonlinear response of the combustion process to velocity fluctuations, and the nature of the resulting instabilities. For the combustion model studied, nonlinear (velocity) coupling was found to more closely characterize liquid propellant instabilities.
Ventrice, M. B.↗
Combustion and operating characteristics of spark-ignition engines
The spark-ignition engine turbulent flame propagation process was investigated. Then, using a spark-ignition engine cycle simulation and combustion model, the impact of turbocharging and heat transfer variations or engine power, efficiency, and NO sub x emissions was examined.
Heywood, J. B.↗
Instant-replay data system for combustion tests
A portable, inexpensive, easily programmed, and flexible pressure measuring and display system is described and evaluated in a multi-port combustion model. The data reduction system consists of a desk-top graphics display system and calculator with data tape storage and standard data communications interfacing capabilities, while a hard copy unit provides a permanent record of all plots and tables. The system offers the advantages of recording and comparing a large number of pressures at high data rates along with the display of the results in a meaningful graphical form for near real time analysis. Some discussion of combustor and engine experiments are included as examples of the data system application.
Trexler, C. A.↗
Flow process in combustors
Fluid mechanical effects on combustion processes in steady flow combustors, especially gas turbine combustors were investigated. Flow features of most interest were vorticity, especially swirl, and turbulence. Theoretical analyses, numerical calculations, and experiments were performed. The theoretical and numerical work focused on noncombusting flows, while the experimental work consisted of both reacting and nonreacting flow studies. An experimental data set, e.g., velocity, temperature and composition, was developed for a swirl flow combustor for use by combustion modelers for development and validation work.
Gouldin, F. C.↗
Symposium /International/ on Combustion, 18th, University of Waterloo, Waterloo, Ontario, Canada, August 17-22, 1980, Proceedings
Problems related to combustion generated pollution are explored, taking into account the mechanism of NO formation from nitrogen compounds in hydrogen flames studied by laser fluorescence, the structure and similarity of nitric oxide production in turbulent diffusion flames, the effect of steam addition on NO formation, and the formation of NO2 by laminar flames. Other topics considered are concerned with propellant combustion, fluidized bed combustion, the combustion of droplets and sprays, premixed flame studies, fire studies, and flame stabilization. Attention is also given to coal flammability, chemical kinetics, turbulent combustion, soot, coal combustion, the modeling of combustion processes, combustion diagnostics, detonations and explosions, ignition, internal combustion engines, combustion studies, and furnaces.
Source record↗
An overview of the NASA rotary engine research program
A brief overview and technical highlights of the research efforts and studies on rotary engines over the last several years at the NASA Lewis Research Center are presented. The test results obtained from turbocharged rotary engines and preliminary results from a high performance single rotor engine were discussed. Combustion modeling studies of the rotary engine and the use of a Laser Doppler Velocimeter to confirm the studies were examined. An in-house program in which a turbocharged rotary engine was installed in a Cessna Skymaster for ground test studies was reviewed. Details are presented on single rotor stratified charge rotary engine research efforts, both in-house and on contract.
Meng, P. R.↗
Predicting Two-Dimensional, Unsteady Turbulent Combustion
MIMOC calculates flow field and flame propagation in turbulent combustion tunnel. Program employs algorithm for turbulent combustion modeling described by Ghoniem, Chorin, and Oppenheim. Program used to study flow field in model combustor, formed by rearward-facing step in channel, in terms of vorticity field, velocity field, turbulent shear stresses, flame contours, and concentration field.
Marek, C. J.↗
A Fundamental Study of Smoldering with Emphasis on Experimental Design for Zero-G
The objective of this section of the microgravity project is to identify key sets of low-gravity experiments which would critically compliment a larger set of more easily performed normal-gravity experiments to explain the phenomena found in smoldering combustion. It is planned to follow through on the conceptual design of these experiments by participating in the future in the fabrication of the refined apparatus and in the data collection and interpretation. Low-gravity experiments are appropriate for smoldering combustion because of the complexity of smoldering which requires every means possible to discriminate among the many chemical and physical mechanisms active in most smoldering combustion scenarios. Efforts will be primarily analytical, attempting to identify appropriate approximations and dominant dimensionless groups based on existing data and state-of-the-art combustion modelling. Transient stability questions such as ignition, extinction and the choices among charring, tarring, or flaming modes will be included.
Pagni, P. J.↗