三维液氮空化的大涡模拟和机理

doi:10.11949/j.issn.0438-1157.20161371

化工学报 ›› 2016, Vol. 67 ›› Issue (S2): 70-77.DOI: 10.11949/j.issn.0438-1157.20161371

三维液氮空化的大涡模拟和机理

徐璐, 朱佳凯, 谢黄骏, 周芮, 张小斌

浙江大学制冷与低温研究所, 浙江杭州 310027

收稿日期:2016-09-29 修回日期:2016-10-19 出版日期:2016-12-30 发布日期:2016-12-30
通讯作者: 张小斌
基金资助:
国家自然科学基金项目（51276157）；浙江省杰出青年基金项目（R15E060001）。

Numerical simulation and analysis of three-dimension cavitation in liquid nitrogen

XU Lu, ZHU Jiakai, XIE Huangjun, ZHOU Rui, ZHANG Xiaobin

Institute of Refrigeration and Cryogenics, Zhejiang University, Hangzhou 310027, Zhejiang, China

Received:2016-09-29 Revised:2016-10-19 Online:2016-12-30 Published:2016-12-30
Supported by:
supported by the National Natural Science Foundation of China (51276157) and the Outstanding Youth Foundation of Zhejiang Province (R15E060001).

摘要/Abstract

摘要：

以三维扭曲翼型（Twist-11N）为研究对象，基于大涡（LES）湍流模型开展了三维液氮空化的数值模拟。通过压力波动曲线得到了液氮空化的空泡脱落周期，观察周期内空泡脱落的过程，与常温空化的数值模拟结果对比，得出了低温空化具有脱落更彻底、过程更复杂的特性。从压力分布和气相云图观察到了三维模拟特有的尾部回射流和侧面射流，分析了三维空化不同于二维的独特性。从涡旋角度分析了空泡脱落与流场的关系，认为空化的发生首先导致了流场的不稳定和涡旋的产生，而涡旋的发展造成了流场边界层分离和空泡的脱落。

关键词: 计算流体力学, 数值模拟, 气液两相流, 空化

Abstract:

This paper mainly simulates liquid nitrogen cavitating flow over a three-dimensional twisted hydrofoil (Twist-11N) based on large eddy simulation (LES) turbulence model.The period of shedding cavitation is observed according to pressure fluctuation characteristics at specific monitoring points.Compared with cavitation of water, cryogenics cavitation shows distinctness.Are-entrant jet and a pair of side-entrant jets are observed during cavitating evolution, which is unrevealed in two-dimensional cavitation.The vortex analysis of the interaction between shedding cavitation and the flowing field is performed.It is indicated that the occurrence of cavitation first leads to the unsteady of flow and thus vortexes occur, which further causes the boundary layer separation and cavity shedding.

Key words: CFD, numerical simulation, gas-liquid flow, cavitation

中图分类号:

TB663

徐璐, 朱佳凯, 谢黄骏, 周芮, 张小斌. 三维液氮空化的大涡模拟和机理[J]. 化工学报, 2016, 67(S2): 70-77.

XU Lu, ZHU Jiakai, XIE Huangjun, ZHOU Rui, ZHANG Xiaobin. Numerical simulation and analysis of three-dimension cavitation in liquid nitrogen[J]. CIESC Journal, 2016, 67(S2): 70-77.

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三维液氮空化的大涡模拟和机理

Numerical simulation and analysis of three-dimension cavitation in liquid nitrogen

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