气核尺寸对气液同轴离心式喷嘴自激振荡的影响

doi:10.7527/S1000-6893.2014.0023

ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2014, Vol. 35 ›› Issue (12): 3283-3292.doi: 10.7527/S1000-6893.2014.0023

• Fluid Mechanics and Flight Mechanics • Previous Articles Next Articles

Influence of Gas Core Dimension on Self-pulsation of Gas-liquid Swirl Coaxial Injector

KANG Zhongtao^1,2, ZHANG Xinqiao^1,2, CHENG Peng^1,2, LI Qinglian^1,2, WANG Zhenguo^1,2

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

Received:2014-01-21 Revised:2014-03-19 Online:2014-12-25 Published:2014-04-08
Supported by:
National Basic Research Program of China (613239); National Natural Science Foundation of China (11472303, 11402298); Program for New Century Excellent Talents in University (NCET-13-0156)

Abstract

Abstract:

To understand the influence of gas core dimension on self-pulsation characteristics of gas-liquid swirl coaxial injector, non-reactive spray experiments are conducted with water and air at atmospheric pressure. The spray morphology of gas-liquid swirl coaxial injectors with different gas core dimensions is investigated while self-pulsation happens. Self-pulsation morphology changes with gas core dimension; the spray looks like a Christmas tree with a large gas core, and a string of pearl with small gas core. The results indicate that gas core dimension significantly affects the self-pulsation mechanism, which in turn varies the influence of recess length on self-pulsation. Self-pulsation frequency varies complicatedly with recess length when gas core dimension is large enough. But with a small gas core, the recess length can hardly change the frequency of self-pulsation. In general, self-pulsation frequency is in the range of 2-4 kHz, which corresponds to frequency range of first transrerse mode in combustion instability. Namely, self-pulsation can trigger combustion instability.

Key words: gas-liquid swirl coaxial injector, gas core dimension, self-pulsation, spray morphology, atomization

CLC Number:

V233.2⁺4

KANG Zhongtao, ZHANG Xinqiao, CHENG Peng, LI Qinglian, WANG Zhenguo. Influence of Gas Core Dimension on Self-pulsation of Gas-liquid Swirl Coaxial Injector[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2014, 35(12): 3283-3292.

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Influence of Gas Core Dimension on Self-pulsation of Gas-liquid Swirl Coaxial Injector

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