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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.

液体中心式气液同轴离心式喷嘴自激振荡间断现象的实验和理论研究

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