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Acta Aeronautica et Astronautica Sinica ›› 2024, Vol. 45 ›› Issue (11): 529095-529095.doi: 10.7527/S1000-6893.2023.29095

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Experimental study on cavitating flow characteristics of inducer with inflow entrained non⁃condensable gas

Ronghao LIN(), Hui CHEN, Le XIANG, Nianchong QU   

  1. Xi’an Aerospace Institute,Xi’an 710100,China
  • Received:2023-06-01 Revised:2023-07-24 Accepted:2023-08-23 Online:2024-06-15 Published:2023-09-13
  • Contact: Ronghao LIN E-mail:lin1018abc@163.com
  • Supported by:
    National Basic Research Program of China(613321)

Abstract:

To study the effect of inflow entrained non-condensable gas on cavitating flow inside the inducer, a series of experiments are performed based on the visualization experimental platform. The macroscopic performance, cavitation development and cavitation instabilities of the inducer pump with different inlet gas volume fractions are investigated. It is found that the head breakdown occurred earlier at larger inlet gas volume fractions. Additionally, the non-condensable gas is entrained in leakage flow vortices and backflow vortices,resulting in significant extensions of leakage flow vortex cavities and backflow vortex cavities, under larger inlet non-condensable gas entrained condition. With small cavitation numbers (Φ=0.083, σ=0.090, and Φ=0.071, σ=0.068), the non-condensable gas provides extra cavitation compliance to the cavity and therefore suppresses the cavitation surge.

Key words: inducer, cavitation, visualization, non-condensable gas, cavitation instability

CLC Number: