1 Introduction Spray and combustion characteristics of an oxidant-centered liquid oxygen/liquid methane (LOX/LCH4) pintle injector under different momentum ratio control modes are studied by numerical simulation. Results show a high total momentum ratio (TMR) can be good for boosting overall combustion efficiency. Either an increase in LOX injection pressure drop or a reduction in LCH4 pressure drop can increase the TMR and pro-mote the diffusion of the high-temperature zone along the length direction of the combustion chamber, and in engineering applications, the flame distribution can be changed by adjusting the TMR. LCH4 atomizes faster, the contact area of oxygen on the combustion chamber wall is larger, and the range of the low-temperature zone in front of the pintle tip is smaller when the TMR is 1.37, compared with TMR of 0.62. Four high-temperature peaks are formed on the central line passing through the apex of the pintle tip in the combustion chamber width direction since an arc-shaped shear flame develops. Vortices can promote flame stability by extending the mixing time of the gases, thus preventing the development of high tem-perature in the combustion chamber head and at the pintle tip. Also a 3D spray structure of the pintle in-jector contributes to its good combustion stability.

Rui ZHOU;Chi-bing SHEN

Science and Technology on Scramjet Laboratory,College of Aerospace Science and Engineering,National University of Defense Technology,Changsha 410073,China

浙江大学学报（英文版）（A辑：应用物理和工程）

[1]Rui ZHOU;Chi-bing SHEN-.Influence of momentum ratio control mode on spray and combustion characteristics of a LOX/LCH4 pintle injector)[J].浙江大学学报（英文版）（A辑：应用物理和工程）,2022(05):415-420

LCH4,pintle, Spray,atomizes,jector

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