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### 液氢绕水翼非定常空化流动特性研究

1. 1. 大连理工大学 船舶工程学院
2. 大连理工大学
3. 哈尔滨工业大学航天学院
4. 大连理工大学工业装备结构分析国家重点实验室
• 收稿日期:2016-11-17 修回日期:2017-01-19 发布日期:2017-04-07
• 通讯作者: 张桂勇
• 基金资助:
国家自然科学基金重点项目;中央高校基本科研业务费专项资金资助;黑龙江省自然科学基金

### Study of the Characteristics of Unsteady Cavitating Flow around Hydrofoil in Liquid Hydrogen

• Received:2016-11-17 Revised:2017-01-19 Published:2017-04-07

Abstract: In order to address the characteristics of unsteady cavitating flow in liquid hydrogen, numerical simulations are investigated around the NACA0015 hydrofoil by using secondary development of computational fluid dynamics (CFD) code CFX. The latent heat of evaporation is considered in the energy equation, an extended thermodynamics Zwart cavitation model and Partially-Averaged Navier-Stokes ( PANS) method are applied in the numerical simulations. Experimental measurements of cavity evolution and pressure are utilized to validate the computational strategy. The results show that temperature field distribution around hydrofoil is closely related to the cavity evolution characteristics of the flow field, the predicted temperature gradient is higher in the core region, the closure position of the cavitation and the interior area of the shedding cavity, the predicted temperature is lower at the mid-plane. The maximum lift coefficient, drag coefficient and the average drag coefficient gradually decreases with the increasing cavitation numbers, whereas as cavitation number increases, the average lift coefficient becomes larger. For the cases of cavitating flow with small cavitation number, the reentrant flow is stronger and a lot of high-intensity vortices appear in the near-wall region of the hydrofoil, the . However, the high-intensity vortices for large cavitation number mainly exist in the vapor-liquid interface.