Numerical Study of Hydrogen and Ethylene Injected Normally in a Two-dimensional Dual-mode Scramjet Combustor

2004 ◽  
Author(s):  
Robert Carson ◽  
Taj Mohieldin ◽  
S. Tiwari
Keyword(s):  
Numerical Study ◽  
Two Dimensional ◽  
Dual Mode ◽  
Scramjet Combustor

A numerical study on the mixing of air and hydrogen in a scramjet combustor

2005 ◽  
Vol 109 (1097) ◽  
pp. 325-335
Author(s):  
M. Ali ◽  
T. Fujiwara
Keyword(s):  
Stokes Equations ◽  
Numerical Study ◽  
Side Wall ◽  
Recirculation Region ◽  
Mixing Efficiency ◽  
Main Stream ◽  
Two Dimensional ◽  
Injection Angle ◽  
Scramjet Combustor ◽  
Flow Field Characteristics

Abstract A numerical study on mixing of air and hydrogen is performed by solving two-dimensional full Navier-Stokes equations. The main stream is air of Mach 5 entering through the configured inlet of the combustor and gaseous hydrogen is injected from the configured jet on the side wall. Supersonic mixing and diffusion mechanisms of a transverse hydrogen jet in two-dimensional finite air streams have been analyzed and discussed. The computed results are compared with the experimental data and show good agreement. For an otherwise fixed combustor geometry, the air inlet width and injection angle are varied to study the physics of mixing and flow field characteristics. On the effect of inlet width variation, two competing phenomena have been observed: (i) upstream of injector the strength of recirculation is higher for wider inlet and consequently the mixing increases, and (ii) downstream, the diffusion of hydrogen decreases with the increase of inlet width and eventually mixing decreases. As a result, in far downstream the mixing efficiency increases up to certain inlet width and then decreases for further increment of inlet width. For the variation of injection angle results show that upstream of injector the mixing is dominated by recirculation and downstream the mixing is dominated by mass concentration of hydrogen. Upstream recirculation is dominant for injecting angle 60° and 90°. Incorporating the various effects, perpendicular injection shows the maximum mixing efficiency and its large upstream recirculation region has a good flame holding capability.

Experimental and Numerical Study of a Dual-mode Scramjet Combustor

2006 ◽  
Vol 22 (3) ◽  
pp. 481-489 ◽  
Author(s):  
C. P. Goyne ◽  
C. G. Rodriguez ◽  
R. H. Krauss ◽  
J. C. McDaniel ◽  
C. R. McClinton
Keyword(s):  
Numerical Study ◽  
Dual Mode ◽  
Scramjet Combustor

Numerical Simulation of Dual-Mode Scramjet Combustor with Significant Upstream Interaction

2012 ◽  
Vol 2 (3) ◽  
pp. 60-74
Author(s):  
Rahul Ingle ◽  
Debasis Chakraborty
Keyword(s):  
Surface Pressure ◽  
Stokes Equations ◽  
Numerical Study ◽  
Three Dimensional ◽  
Interaction Model ◽  
Navier Stokes ◽  
Dual Mode ◽  
Fast Kinetics ◽  
Scramjet Combustor ◽  
Flow Features

This paper is concerned with a numerical study corresponding to experimental investigation of Chinzei and co-workers on hydrogen fueled dual-mode scramjet engine essentially to understand the key features of upstream interaction, mixing and combustion. Three dimensional Navier Stokes equations along with a K-? turbulence model and infinitely fast kinetics are solved using commercial CFD software. Reasonable agreement has been obtained between the computed surface pressure with experimental values and the results of other numerical simulations. Insights into the flow features inside the combustor are obtained through analysis of various thermochemical parameters. The comparison of surface pressure with experimental results and other numerical results demonstrated that simple kinetics and turbulence – chemistry interaction model may be adequate to address the overall flow features in the combustor. A principal conclusion is that the boundary layer at the combustor entry has a pronounced effect on the flow development in the dual-mode scramjet combustor and causes significant upstream interaction.

Numerical Study on Two-dimensional Magnetic Photonic Crystals Made of Magnetized Ferrites

PIERS Online ◽  
2007 ◽  
Vol 3 (3) ◽  
pp. 305-307 ◽  
Author(s):  
Jie Xu ◽  
Ping Chen ◽  
Yue Shi ◽  
Xin-Yi Ji ◽  
Ai-Min Jiang ◽  
...  
Keyword(s):  
Photonic Crystals ◽  
Numerical Study ◽  
Two Dimensional ◽  
Magnetic Photonic Crystals

Co-planar two-dimensional Metal-Insulator-Semiconductor Capacitor: Numerical study of the device electrostatics.

2017 ◽  
Author(s):  
Varun Bheemireddy
Keyword(s):  
Space Charge ◽  
High Performance ◽  
Numerical Study ◽  
2D Materials ◽  
Space Charge Density ◽  
Two Dimensional ◽  
Short Channel ◽  
Metal Insulator ◽  
Metal Insulator Semiconductor ◽  
New Family

The two-dimensional(2D) materials are highly promising candidates to realise elegant and e cient transistor. In the present letter, we conjecture a novel co-planar metal-insulator-semiconductor(MIS) device(capacitor) completely based on lateral 2D materials architecture and perform numerical study of the capacitor with a particular emphasis on its di erences with the conventional 3D MIS electrostatics. The space-charge density features a long charge-tail extending into the bulk of the semiconductor as opposed to the rapid decay in 3D capacitor. Equivalently, total space-charge and semiconductor capacitance densities are atleast an order of magnitude more in 2D semiconductor. In contrast to the bulk capacitor, expansion of maximum depletion width in 2D semiconductor is observed with increasing doping concentration due to lower electrostatic screening. The heuristic approach of performance analysis(2D vs 3D) for digital-logic transistor suggest higher ON-OFF current ratio in the long-channel limit even without third dimension and considerable room to maximise the performance of short-channel transistor. The present results could potentially trigger the exploration of new family of co-planar at transistors that could play a signi significant role in the future low-power and/or high performance electronics.<br>

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