Extended compressible thermal cavitation model for the numerical simulation of cryogenic cavitating flow
Extended compressible thermal cavitation model for the numerical simulation of cryogenic cavitating flow
复制标题
低温空化流数值模拟的扩展可压缩热空化模型
DOI：
10.1016/j.ijhydene.2020.01.192
复制
发表时间：
2020
影响因子：
7.2
通讯作者：
Zhu Zuchao
中科院分区：
文献类型：
--
作者：
Li Xiaojun;Shen Tangjun;Li Pengcheng;Guo Xiaomei;Zhu Zuchao
汽液两相的可压缩性是模拟液氢、液氮空化流动不可缺少的条件。本文提出了一种考虑压缩性并结合低温流体热效应的数值模拟方法。该方法由可压缩热空化模型和修正湍流涡粘性的RNGk-ε湍流模型组成。空化模型以ZGB模型为基础，耦合传热方程和汽液两相状态方程。以空泡水翼和尖拱为例对模型进行了验证，计算结果与NASA的Hord实验数据吻合较好。将相变过程中的可压缩性和热效应联系起来，可压缩性的引入提高了基于热效应的低温空化流数值模拟的精度。此外，热效应延迟或抑制了空化行为的发生和发展。所提出的修正的可压缩ZGB（MCZGB）模型可以预测各种条件下的可压缩低温空化流动。
The compressibility of the vapour–liquid phase is indispensable in simulating liquid hydrogen or liquid nitrogen cavitating flow. In this paper, a numerical simulation method considering compressibility and combining the thermal effects of cryogenic fluids was developed. The method consisted of the compressible thermal cavitation model and RNGk–εturbulence model with modified turbulent eddy viscosity. The cavitation model was based on the Zwart–Gerber–Belamri (ZGB) model and coupled the heat transfer and vapour–liquid two-phase state equations. The model was validated on cavitating hydrofoil and ogive, and the results agreed well with the experimental data of Hord in NASA. The compressibility and thermal effects were correlated during the phase change process and compressibility improved the accuracy of the numerical simulation of cryogenic cavitating flow based on thermal effects. Moreover, the thermal effects delayed or suppressed the occurrence and development of cavitation behaviour. The proposed modified compressible ZGB (MCZGB) model can predict compressible cryogenic cavitating flow at various conditions.