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Journal of Zhejiang University SCIENCE A 1998 Vol.-1 No.-1 P.

http://doi.org/10.1631/jzus.A2100222


Experimental and theoretical study on the break phenomenon of self-pulsation for liquid-centered swirl coaxial injectors


Author(s):  Peng-jin CAO, Xiao BAI, Qing-lian LI, Peng CHENG

Affiliation(s):  Science and Technology on Scramjet Laboratory, College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China

Corresponding email(s):   zndxbx@163.com, peakdreamer@163.com

Key Words:  Break phenomenon, Theoretical model of self-pulsation, Pressure oscillation characteristics, Recess, Liquid-centered swirl coaxial injector


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, 1998, -1(-1): .

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author="Peng-jin CAO, Xiao BAI, Qing-lian LI, Peng CHENG",
journal="Journal of Zhejiang University Science A",
volume="-1",
number="-1",
pages="",
year="1998",
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
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%@ 1673-565X
%D 1998
%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 - -1
IS - -1
SP -
EP -
%@ 1673-565X
Y1 - 1998
PB - Zhejiang University Press & Springer
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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 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 one-dimensional 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 phe-nomenon, 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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