CLC number:
On-line Access: 2022-02-28
Received: 2021-05-13
Revision Accepted: 2021-08-03
Crosschecked: 0000-00-00
Cited: 0
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Peng-jin CAO, Xiao BAI, Qing-lian LI, Peng CHENG. Experimental and theoretical study on the break phenomenon of self-pulsation for liquid-centered swirl coaxial injectors[J]. Journal of Zhejiang University Science A, 2022, 23(2): 140-155.
@article{title="Experimental and theoretical study on the break phenomenon of self-pulsation for liquid-centered swirl coaxial injectors",
author="Peng-jin CAO, Xiao BAI, Qing-lian LI, Peng CHENG",
journal="Journal of Zhejiang University Science A",
volume="23",
number="2",
pages="140-155",
year="2022",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.A2100222"
}
%0 Journal Article
%T Experimental and theoretical study on the break phenomenon of self-pulsation for liquid-centered swirl coaxial injectors
%A Peng-jin CAO
%A Xiao BAI
%A Qing-lian LI
%A Peng CHENG
%J Journal of Zhejiang University SCIENCE A
%V 23
%N 2
%P 140-155
%@ 1673-565X
%D 2022
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A2100222
TY - JOUR
T1 - Experimental and theoretical study on the break phenomenon of self-pulsation for liquid-centered swirl coaxial injectors
A1 - Peng-jin CAO
A1 - Xiao BAI
A1 - Qing-lian LI
A1 - Peng CHENG
J0 - Journal of Zhejiang University Science A
VL - 23
IS - 2
SP - 140
EP - 155
%@ 1673-565X
Y1 - 2022
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.A2100222
Abstract: Experimental observations together with theoretical analysis were conducted to investigate the break phenomenon and the corresponding mechanisms of self-pulsation for a liquid-centered swirl coaxial injector with recess number of RN=1. Instantaneous spray images were obtained based on background light imaging technology with a high-speed camera. By dynamic analysis of the flow process of the liquid sheet in the recess chamber, a 1D self-pulsation theoretical model was established, and the self-sustaining mechanisms of self-pulsation were analyzed in depth. The results show that the increase of the momentum flux ratio will lead to the occurrence of the break phenomenon of self-pulsation for the injector with a larger recess length, and the frequency and intensity of self-pulsation before and after the break phenomenon differ significantly. The flow dynamics in the recess chamber sequentially transform from a periodic expansion-dominated flow to a stable flow, and then develop to a periodic contraction-dominated flow during the break process of self-pulsation. With the occurrence of self-pulsation before the break phenomenon, the liquid sheet has little effect on the pressure disturbance in the recess chamber. In contrast, with the occurrence of self-pulsation after the break phenomenon, the pressure disturbance is obviously affected by the liquid sheet. Based on the theoretical analysis model of self-pulsation, the self-pulsation frequency can be predicted. Furthermore, the self-sustaining mechanism of self-pulsation before and after the break phenomenon is preliminarily confirmed. The energy transfer between the gas- and liquid-phase is an important factor for maintaining the self-pulsation process.
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