连续旋转爆轰发动机冷流场的混合特性研究

doi:10.7527/S1000-6893.2016.0108

Abstract

Abstract:

Rapid mixing of fuel and oxidizer is the necessary condition for successful initiation and stable propagation of detonation in continuously rotating detonation engine (CRDE). However, there has been few studies on the mixing characteristic of fuel/oxidizer. Two-dimensional larger eddy simulation (LES) is carried out to investigate the hydrogen/oxygen injection and mixing processes in non-premixed CRDE, and reveal the fuel/oxidizer mixing process and main mechanism. Results show that there are underexpanded feature, large scale eddy structure and recirculation zone in the non-premixed CRDE. The turbulence eddy structure generated by the Kelvin-Helmholtz (K-H) instability is the main mechanism for promoting the hydrogen/oxygen mixing. The influence of injection position of oxygen jet on the flow structure and mixing characteristics is also explored. It is found that the injection position of oxygen jet can affects the jet shear layer, vortex size and recirculation zone distribution, and then the mixing process and the mixing degree of the hydrogen and oxygen jets. It is more conducive to rapid mixing of hydrogen/oxygen when the oxygen is injected near the inner wall rather than at other injection positions of CRDE.

Key words: continuously rotating detonation engine, non-premixed injection, large eddy simulation, mixing, injection position, detonation

CLC Number:

V231.2⁺2

ZHOU Rui, LI Xiaopeng. Numerical investigation of mixing characteristic of cold continuously rotating detonation engine[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2016, 37(12): 3668-3674.

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Numerical investigation of mixing characteristic of cold continuously rotating detonation engine

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