HEAT TRANSFER IN SUPERSONIC COMBUSTION PROCESSES

1970 ◽  
Author(s):  
F. S. Billig ◽  
S. E. Grenleski
Keyword(s):  
Heat Transfer ◽  
Supersonic Combustion ◽  
Combustion Processes

Numerical Simulation of Heat Transfer and Fluid Dynamics in Supersonic Chemically Reacting Flows

2010 ◽  
Author(s):  
Alexander M. Molchanov ◽  
Anna A. Arsentyeva
Keyword(s):  
Heat Transfer ◽  
Fluid Dynamics ◽  
High Speed ◽  
Stokes Equations ◽  
Order Approximation ◽  
Reacting Flows ◽  
Supersonic Combustion ◽  
Special Method ◽  
Chemically Reacting Flows ◽  
Chemically Reacting

An implicit fully coupled numerical method for modeling of chemically reacting flows is presented. Favre averaged Navier-Stokes equations of multi-component gas mixture with nonequilibrium chemical reactions using Arrhenius chemistry are applied. A special method of splitting convective fluxes is introduced. This method allows for using spatially second-order approximation in the main flow region and of first-order approximation in regions with discontinuities. To consider the effects of high-speed compressibility on turbulence the author suggests a correction for the model, which is linearly dependent on Mach turbulent number. For the validation of the code the described numerical procedures are applied to a series of flow and heat and mass transfer problems. These include supersonic combustion of hydrogen in a vitiated air, chemically reacting flow through fluid rocket nozzle, afterburning of fluid and solid rocket plumes, fluid dynamics and convective heat transfer in convergent-divergent nozzle. Comparison of the simulation with available experimental data showed a good agreement for the above problems.

Supersonic Combustion Processes in a Premixed Three-Dimensional Nonuniform-Compression Scramjet Engine

AIAA Journal ◽  
2014 ◽  
Vol 52 (8) ◽  
pp. 1670-1685 ◽  
Author(s):  
Mathew G. Bricalli ◽  
Laurie M. Brown ◽  
Russell R. Boyce
Keyword(s):  
Three Dimensional ◽  
Supersonic Combustion ◽  
Scramjet Engine ◽  
Combustion Processes

The Study of Cavity Flow and Transpiration Cooling in Supersonic Combustion

2013 ◽  
Vol 390 ◽  
pp. 370-374
Author(s):  
Hai Yyan Wu ◽  
Meng Ding ◽  
Yi Su
Keyword(s):  
Heat Transfer ◽  
Shear Layer ◽  
Shear Layers ◽  
Supersonic Combustion ◽  
Transpiration Cooling ◽  
Rear Edge ◽  
Eddy Simulation ◽  
Flow And Heat Transfer ◽  
Large Eddy ◽  
Initial Flame

To unravel the flow and heat transfer mechanism of the cavity in supersonic combustion, this paper studied the interaction of cavities and shear-layers by experiments and numerical simulation. The experiments of Nero-particle Plane Laser Scatter (NPLS) and Plane Laser-Induced Fluorescence (PLIF) were conducted to study the cavity shear-layer. In the same supersonic condition the flow was studied by the method of Large Eddy Simulation (LES). And we discussed the cavity shear-layer influence to supersonic flow and combustion, analyzed the evolvement of injection shear-layer, probed into the heat transfer of supersonic combustion, and studied the transpiration cooling of cavities. The results show: in supersonic combustion, the initial flame spreads to the upstream through the cavity shear layer, the highest wall temperature occur at the rear edge of cavity, and transpiration cooling can effectively protect the wall materials.

Applications of Heat Transfer Fundamentals to Fire Modeling

2013 ◽  
Vol 5 (2) ◽  
Author(s):  
O. A. Ezekoye ◽  
M. J. Hurley ◽  
J. L. Torero ◽  
K. B. McGrattan
Keyword(s):  
Heat Transfer ◽  
Uncertainty Propagation ◽  
Fire Modeling ◽  
Model Verification ◽  
Modeling Tools ◽  
The Past ◽  
Modeling Software ◽  
Combustion Processes ◽  
In Fire

The fire industry relies on fire engineers and scientists to develop materials and technologies used to either resist, detect, or suppress fire. While combustion processes are the drivers for what might be considered to be fire phenomena, it is heat transfer physics that mediate how fire spreads. Much of the knowledge of fire phenomena has been encapsulated and exercised in fire modeling software tools. Over the past 30 years, participants in the fire industry have begun to use fire modeling tools to aid in decision making associated with design and analysis. In the rest of this paper we will discuss what the drivers have been for the growth of fire modeling tools; the types of submodels incorporated into such tools; the role of model verification, validation, and uncertainty propagation in these tools; and possible futures for these types of tools to best meet the requirements of the user community. Throughout this discussion, we identify how heat transfer research has supported and aided the advancement of fire modeling.

The k - ε turbulence modelling of heat transfer and combustion processes in a Texaco controlled combustion stratified charge engine

2000 ◽  
Vol 214 (2) ◽  
pp. 149-158
Author(s):  
S. H. Mansouri ◽  
Y Bakhshan
Keyword(s):  
Heat Transfer ◽  
Empirical Constant ◽  
Stratified Charge ◽  
Model Predictions ◽  
Parametric Studies ◽  
High Flexibility ◽  
Compression Effects ◽  
Combustion Processes ◽  
Transfer Flow ◽  
Good Agreement

In this investigation, a model has been developed to predict the performance of a Texaco controlled combustion stratified charge engine (TCCS). This model uses the k - ε turbulence model to determine characteristic velocities for heat transfer calculations, which has only one empirical constant, in contrast to Woschni's equation in which separate constants are used for each process in the four-stroke cycle to determine the velocity for use in Reynolds number calculation. The modified Keck and Blizard model is used for combustion calculation by considering the rapid compression effects on turbulence intensity. Comparison of the model predictions with available experimental data shows a good agreement. Moreover, the program has a high flexibility for parametric studies to calculate performance parameters such as thermal efficiency, pressure, specific fuel consumption, temperature, fluid flow into and out of the cylinder, friction losses, heat transfer, flow field in the cylinder and so on.

scholarly journals Effect of powerful ultrasound on the combustion processes and phase composition of refractory compounds of titanium at the self-propagating high-temperature synthesis

2019 ◽  
Vol 62 (6) ◽  
pp. 674-684
Author(s):  
V. V. Klubovich ◽  
M. M. Kulak ◽  
B. B. Khina
Keyword(s):  
Heat Transfer ◽  
Phase Composition ◽  
High Temperature ◽  
The Self ◽  
Temperature Synthesis ◽  
Ultrasound Frequency ◽  
Refractory Compounds ◽  
High Temperature Synthesis ◽  
Combustion Processes ◽  
Heterogeneous Interactions

The effect of ultrasound oscillations (USO) on the heat transfer conditions between a specimen and environment is examined using a specially developed experimental facility. The influence of the USO amplitude on the combustion temperature and velocity as well as on the phase composition and crystal lattice parameters of the synthesized compounds is studied for the self-propagating high-temperature synthesis (SHS) in Ti–С(Si,B) systems. The heat transfer coefficient on the surface of a specimen during its oscillations with an ultrasound frequency is assessed. Possible mechanisms of the effect of USO on the SHS process are considered. It is demonstrated that a decrease in the SHS temperature is connected with cooling the specimen due to forced convection of a surrounding gas, while a change in a phase composition of the synthesized material and the crystallographic parameters of the phases occurs due to changes in the conditions of high-temperature heterogeneous interactions in the SHS wave.

Sign in / Sign up

Export Citation Format

Share Document