2007 Fiscal Year Final Research Report Summary
CFD Analysis of High-speed Cavitating Water Jet and Hydraulic Design of Jet Nozzle
| Project/Area Number |
18560173
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Fluid engineering
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| Research Institution | Toyama Prefectural University |
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Principal Investigator |
PENG Guoyi Toyama Prefectural University, Facaulty Eng., Assis. Prof. (90295527)
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| Co-Investigator(Kenkyū-buntansha) |
FUJIKWA Shigeo Hokkaido Univ., Facaulty Eng., Prof. (70111937)
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| Project Period (FY) |
2006 – 2007
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| Keywords | Submerged water jet / Cavitation / Flow cisualization / Numerical Simulation |
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| Research Abstract |
A mixture-flow bubble-cavitation model is proposed for unsteady cavitating flow computation by coupling a Two-Fluid Three-Pressure bubble dynamics model and a compressible two-phase flow computation. The fluid media of cavitating flow is treated as a mixture of liquid and spherical gas bubbles, those are supposed to disperse in the liquid phase uniformly. The average bubble radius in a local flow field is calculated by Rayleigh-Plesset equation and cavitation is evaluated by the volume fraction of gas included in bubbles. State equations of liquid and gas phases are employed to define the compressibility of two-phase mixture and a set of mean flow governing equations is developed by phase-averaging. The method is applied to treat flows in an orifice nozzle as well as a venture nozzle and the reliability of computation results is confirmed.
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