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| Numerical simulation of cavitation and Analisis of flow characteristic of thermo-sensitive fluid |
| YANG Qiwen1, ZHANG Wei2,3, LI Xiaojun2*,CHEN Feng3,ZHU Zuchao2 |
| 1. Luoyang Petrochemical Engineering Corporation, SINOPEC, Luoyang, Henan 471003, China; 2.Key Laboratory of Fluid Transmission Technology of Zhejiang Province, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310013, China; 3. Mechanical Engineering Department, Zhejiang Institute of Mechanical & Electronical Engineering, Hangzhou, Zhejiang 310053, China |
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Abstract In order to describe and capture the cavitation flow patterns in thermal-sensitive fluid. Consi-deration the thermodynamic effects, the cavitation model based on the Zwart-Gerber-Belamri(ZGB)model was coupled with the heat transfer and vapour-liquid two-phase state equations was modified to describe and capture the cavitation characteristics of thermal-sensitive fluid. The model was va-lidated by the cavitation flow around a 2D hydrofoil, and the results agreed well with the experimental data of Hord in NASA. The results show that the simulation results by the modified ZGB cavitation model for thermal cavitation flow simulation results are more consistent with the experimental results, especially on the prediction of the temperature and pressure distribution on the hydrofoil surface. Subsequently, the modified ZGB cavitation model was used to investigate the cavitation characteristics of fluoroketone around NACA 0015 hydrofoil, and the evolution process of cavitation flow shedding was compared with Kelly′s experimental data. During the process, the shedding of the cavity near the three-dimensional hydrofoil and its evolution process can reasonably predict. The applicability of the modified ZGB cavitation model for different thermo-sensitive fluids was further proved. Finally, the dynamic cha-racteristics of thermal fluid periodic cavitation shedding were identified and analyzed. The results show that the isosurface of Ω is similar to the shape of the cavity shedding, which indicates that the cavity shedding region shows large-scale vortex motion. The growth and shedding of the cavity cause a significant temperature drop on the hydrofoil wall surface, and the B-factor can effectively predict the temperature drop in the cavity.
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Received: 15 May 2020
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