Experimental study on the influence of air injection on unsteady cloud cavitating flow dynamics

Author:

Zhang Naimin12,Zhao Yang1,Wei Haipeng2,Chen Guanghao3

Affiliation:

1. School of Astronautics, Harbin Institute of Technology, Harbin, China

2. Beijing Institute of Astronautics System Engineering, Beijing, China

3. Beijing Institute of Technology, Beijing, China

Abstract

The main purpose of this study was to investigate the influence of air-injection technique on unsteady cloud cavitating flow dynamics. High-speed camera and pressure measurement system are used to record ventilated cavitation images and wall-pressure fluctuation in a convergent–divergent channel, respectively. The measured ventilated cavitation evolution process and corresponding wall-pressure fluctuation are compared with those obtained under non-ventilation condition. The results show that air-injection technique can significantly suppress pressure pulses induced by cavity collapse. Furthermore, by increasing ventilation rate, the time evolution of cavitation tends to be more stable, the wall-pressure fluctuation magnitude is reduced significantly, and the cloud shedding frequency is reduced, which is believed to be related to the interaction between injected air and re-entrant flow.

Publisher

SAGE Publications

Subject

Mechanical Engineering

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