|Table of Contents|

Study on turbulent model of unsteady cavitating flow around hydrofoil(PDF)

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

Issue:
2019年06期
Page:
29-37
Research Field:
研究与技术
Publishing date:

Info

Title:
Study on turbulent model of unsteady cavitating flow around hydrofoil
Author(s):
LI Yumeng;  CHEN Hui;  XIANG Le;  ZHANG Yatai
(Science and Technology on Liquid Rocket Engine Laboratory, Xi’an Aerospace Propulsion Institute,Xi’an 710100, China)
Keywords:
hydrofoil;  cavitating flow;  unsteady;  turbulence model;  MFBM
PACS:
V431; TV131.32
DOI:
-
Abstract:
In order to improve the standard k-ε turbulent model in traditional RANS method over-predicting the eddy viscosity, this paper evaluates the application of several modified approaches used to reduce the eddy viscosity in cavitating flow.The modified turbulent models are employed in the commercial CFD software to simulate the unsteady cavitating flow around a 2D hydrofoil.It is found that the error of lift coefficient calculated by the MFBM model is only 0.6% and it is the smallest compared with the experimental results.In addition, the unsteady cavitation morphology calculated by MFBM is the closest to the experiment data, which indicates that MFBM has the best simulation effect.At the same time, based on the computation results, the mechanism of unsteady cavitating flow around a hydrofoil is revealed, and the reverse jet caused by the adverse pressure gradient results in the shedding of cloud cavitation.The shedded cloud cavitation collapses and changes the pressure distribution around the hydrofoil, which causes the periodic shedding of cloud cavitation and further leads to the periodically change of lift coefficient.

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Last Update: 2019-12-20