一种可压缩空化相变算法的理论研究和验证  

Theoretical Study and Verification of Compressible Cavitation Phase Change Algorithm

作　　者：房良 王振波[3] 马勇 徐晓刚[5] Fang Liang;Wang Zhenbo;Ma Yong;Xu Xiaogang(Low Carbon Technology Institute,Weifang University,Weifang 261061,China;National Center of Technology Innovation for Fuel Cell,Weifang 261061,China;School of New Energy,China University of Petroleum(East China),Qingdao 266580,China;Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai 519082,China;College of Petrochemical Technology,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]潍坊学院低碳技术研究院,潍坊261061 [2]国家燃料电池技术创新中心,潍坊261061 [3]中国石油大学(华东)新能源学院,青岛266580 [4]南方海洋科学与工程广东省实验室(珠海),珠海519082 [5]兰州理工大学石油化工学院,兰州1730050

出　　处：《水动力学研究与进展（A辑）》2023年第5期683-691,共9页Chinese Journal of Hydrodynamics

基　　金：国家自然科学基金(52176050)。

摘　　要：可压缩性被认为对空化流动具有重要影响,但现阶段空化研究中鲜有考虑可压缩性。为明确可压缩性的作用,根据正压流体假设,通过开源CFD软件OpenFoam~?框架,编译了一种可压缩空化相变求解器,重点说明了该求解器的算法,包括控制方程推导、数值处理方法及离散格式和求解策略的选择,并以文丘里管内空化流动为对象,与不考虑可压缩性空化相变求解器的计算结果作对比。结果表明:该求解器能够较为准确预测空化流动,清晰给出空腔周期性演化过程;考虑压缩性后,空腔溃灭所产生高压会以压力波形式传播、反弹和叠加,产生高频压力脉动,抑制空腔发展并加速空腔脱落,引起速度场严重失稳,导致出口流量发生高频脉动。Compressibility is supposed to play an important role in cavitation flow, but it is rarely considered in current cavitation studies. To clarify the role of compressibility, a compressible cavitation phase change solver is developed via the open-source CFD framework OpenFoam? based on the assumption of barotropic fluid, highlighting the algorithms, including control equations derivation, numerical processing methods, discrete formats and solution strategies. Then, Venturi tube is adopted to calculate cavitation flow, and the results are compared with those ignoring compressibility. The results show that this solver can accurately predict cavitation flow and periodic cavity evolution. Consideration of compressibility enables the cavity collapse induced high pressure to propagate, rebound, and superimpose in the form of pressure waves, resulting in high frequency pressure pulsations,inhibiting cavity development and accelerating cavity shedding. Moreover, this also causes instability of the velocity field, leading to high frequency pulsation of the outlet flow.

关 键 词：水力空化 可压缩性 压力波 CFD算法 

分 类 号：O359.1[理学—流体力学]