The 12th International Conference on Hydrodynamics
18 – 23 september 2016, Egmond aan Zee, The Netherlands
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RESEARCH ON SUPPRESSION OF CAVITY FLOW INDUCED NOISE BY FLOW CONTROL METHOD


Go-down ichd2016 Tracking Number 72

Presentation:
Session: Computational Fluid Dynamics II
Room: Room 2
Session start: 14:00 Mon 19 Sep 2016

Wang Xing   wx547065124@126.com
Affifliation:

Zhang Nan   zn_nan@sina.com
Affifliation:

Xie Hua   xie621@163.com
Affifliation:

Wu Baoshan   wbscssrc@163.com
Affifliation:


Topics: - Computational fluid dynamics

Abstract:

The suppression of non cavitating flow induced noise over a cavity is an important and complex issue in fluid-dynamic acoustics field. In hydroacoustics, it is short of an intensive investigation for the problem.So a flow control method (airfoil guide vanes) was analyzed with the numerical simulation and model test to reduce the noise of the cavity in this paper. The flow past the cavity is simulated numerically by large eddy simulation with three different meshes to analyze the grid convergence. The structures of the vortical flow are captured by Vortex identification (Q) and the spectrum of the cavity vertical oscillation velocities in ten different positions are shown. Then the flow fields past the cavity with airfoil guide vanes of different heights and number are simulated numerically. After that, the flow induced noise of different models is computed by Powell vortex sound equation. Finally, the flow induced noise of the cavity with five NACA0010 airfoil guide vanes of 0.02m height is measured in the Cavitation Tunnel of CSSRC. Through the experimental measurement of the flow induced noise, it is found that with the airfoil guide vanes, the effective suppression to flow induced noise is obtained.