Large Eddy Simulation of Mixing Characteristic in the Cold Rotating Detonation Chamber
Two-dimensional large eddy simulation (LES) for supersonic compressible multicomponent flow is carried out to investigate the mixing characteristic of the cold non-premixed RDE with different injection strategies. According to the instantaneous and quasi-stead time-averaged flow field, the nonuniform mixing characteristic is presented. The turbulence eddy structure generated by the K-H instability is the main mechanism for promoting the mixing of fuel and oxidizer. Combining the rich and lean combustion limits, the area of the detonation is identified. It is found that the area of the detonation is only a narrow layer near the head end. To improve the mixing efficiency near the head end in the non-premixed RDE, the oxygen injection position and hydrogen injection angle are adjusted preliminary. The mixing characteristics and the area of the detonation are analyzed in detail. The present research can provide the important reference and guidance for the experimental injection design of the RDE.
The work was supported by the National Natural Science Foundation of China (Grant No.11602028; No. 11502029).
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