Theoretical Analysis of Transitional and Partial Cavity Instabilities
Author:
Watanabe Satoshi1, Tsujimoto Yoshinobu2, Furukawa Akinori1
Affiliation:
1. Faculty of Engineering, Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan 2. Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka 560-8581, Japan
Abstract
This paper describes a new time marching calculation of blade surface cavitation based on a linearized free streamline theory using a singularity method. In this calculation, closed cavity models for partial and super cavities are combined to simulate the transitional cavity oscillation between partial and super cavities. The results for an isolated hydrofoil located in a 2-D channel are presented. Although the re-entrant jet is not taken into account, the transitional cavity oscillation with large amplitude, which is known to occur when the cavity length exceeds 75 percent of the chord length, was simulated fairly well. The partial cavity oscillation with relatively high frequency was simulated as damping oscillations. The frequency of the damping oscillation agrees with that of a stability analysis and of experiments. The present calculation can be easily extended to simulate other cavity instabilities in pumps or cascades.
Publisher
ASME International
Subject
Mechanical Engineering
Reference13 articles.
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