基于空泡球形度修正的Schnerr-Sauer空化模型改进

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中图分类号：TK01 文献标志码：A 文章编号：1673-3851（2025）09-0731-11

Improvement of Schnerr-Sauer cavitation model based on correction of bubble sphericity

LIN Peifeng，LI Xi，LOU Yuhang，CHEN Qi （Zhejiang Key Laboratory of Multiflow and Fluid Machinery， Zhejiang Sci-Tech University， Hangzhou 310018，China）

Abstract： To address the significant discrepancy between the spherical bubble assumption in the original Schnerr-Sauer cavitation model and actual bubble deformation in flow，this study developed a modified cavitation model coupling sphericity with pressure-related quantities through large eddy simulation method analysis of bubble deformation characteristics in flow fields. Numerical simulations of unsteady cavitating flow around a 3D NACA66 hydrofoil were conducted using both the modified model and the original Schner-Sauer model at a cavitation number of 1.25，obtaining bubble distribution patterns and hydrodynamic characteristics. The results demonstrate that the modified model significantly improves cavitation flow prediction accuracy： it captures more extensive cavity regions and longer atached cavities that better match experimental observations； improves prediction accuracy of cavity shedding by 9.41% ; and enhances the prediction accuracy of instantaneous pressure fluctuation amplitude by approximately 28.00% . The study results provide certain reference for advancing the understanding of unsteady cavitation flow mechanisms and related engineering applications.

Key words： bubble sphericity;cavitation; cavitation model; NACA66 hydrofoil; numerical simulation

0 引言

空化是一种普遍存在于水力机械中的自然物理相变现象。（剩余12473字）