|Table of Contents|

Inducer super-synchronous rotating cavitation propagation mechanism(PDF)

《火箭推进》[ISSN:1672-9374/CN:CN 61-1436/V]

Issue:
2022年02期
Page:
76-85
Research Field:
目次
Publishing date:

Info

Title:
Inducer super-synchronous rotating cavitation propagation mechanism
Author(s):
XIANG Le; LI Chunle; XU Kaifu; CHEN Hui
(Xian Aerospace Propulsion Institute, Xian 710100, China)
Keywords:
inducer super-synchronous rotating cavitation propagation mechanism plate cascade
PACS:
TV131.32 V431
DOI:
-
Abstract:
In order to explain the propagation mechanism of SRC(super-synchronous rotating cavitation), the unsteady cavitating flow inside a 2D plate cascade was numerically investigated, the geometric parameters and working condition parameters were from real experimental results. It was found that the cavitation breakdown point of cascade is close to the experimental results, the evolution of cavity with reduction of cavitation number is in consistent with the experimental results. The propagation ratio of SRC which occurs in a specific cavitation number range is 1.1～1.4, the detailed analysis of flow field indicates that the interaction of cavity and incidence angle is the super-synchronous propagation mechanism of cavitation fluctuation. The cavitation development and incidence angle are positively related. The cavitation expansion will induce clockwise vortex disturbance near the trailing edges, and cavitation shrink will induce anticlockwise vortex disturbance. When the disturbances arrive the throat position of the blades, they will affect on the adjacent blade. The incidence angle of adjacent blade leading edge will decrease due to cavitation expansion, the corresponding cavitation area decreases. The incidence angle of adjacent blade leading edge will increase due to cavitation shrink, the corresponding cavitation area increase. The cavitation areas on the three blades move in circles, thus the SRC is formed.

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