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Evaluation of vorticity forces in thermo-sensitive cavitating flow considering the local compressibility
International Communications in Heat and Mass Transfer ( IF 6.4 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.icheatmasstransfer.2020.105008
Tangjun Shen , Xiaojun Li , Linmin Li , Zhengdong Wang , Yaoyao Liu

Abstract The correlation between hydrodynamic forces and cavity evolution has been widely investigated but has not been deeply revealed. This study uses force element method to analyse the characteristics of force evolution along with cavitation around a NACA0015 hydrofoil. A modeling framework using the mixture two-phase flow model considering the energy convection and compressibility is proposed, to investigate the compressibility and thermal effects in the thermo-sensitive cavitating flow. Moreover, a force element method is applied for evaluating vorticity forces. The evolution of lift and drag coefficients under different cavitation numbers is mainly studied. Results indicate that, with increasing cavitation number, the time-averaged lift and drag coefficients firstly rise and then decline. However, the drag coefficient decline trend is greater than the lift coefficient. Combined with cavity evolution, the transient lift and drag evolution is analysed. Positive lift elements are mainly concentrates on the cavity surface and transport with cavity development, but the rupture of detached cavity and the pressure wave will inhibit the growth. The lift force reaches its peak when the cavity forms with the attached cavity that is completely detached from the hydrofoil surface, because of the volume of positive lift element reaches its maximum. Except for the shearing fracture of leading edge with the effect of fluid impact, the evolution of drag elements is similar to the lift. This studies shows that the force element method can well reveal the mechanism of force evolution due to the cavitation.

中文翻译:

考虑局部压缩性的热敏空化流涡力评估

摘要 流体动力与腔演化之间的相关性已被广泛研究,但尚未深入揭示。本研究使用力元方法来分析力随 NACA0015 水翼周围空化作用的演变特征。提出了一种使用考虑能量对流和可压缩性的混合两相流模型的建模框架,以研究热敏空化流中的可压缩性和热效应。此外,还应用了力元方法来评估涡力。主要研究了不同空化数下升阻系数的演变规律。结果表明,随着空化数的增加,时均升阻系数先上升后下降。然而,阻力系数下降趋势大于升力系数。结合空腔演化,分析了瞬态升阻演化。正升力元素主要集中在空腔表面,随着空腔的发展而输送,但分离空腔的破裂和压力波会抑制增长。由于正升力元件的体积达到最大值,当空腔与连接的空腔完全脱离水翼表面时,升力达到峰值。除了流体冲击作用下的前缘剪切断裂外,阻力因素的演化与升力相似。该研究表明,力元方法可以很好地揭示空化作用引起的力演化机制。结合空腔演化,分析了瞬态升阻演化。正升力元素主要集中在空腔表面,随着空腔的发展而输送,但分离空腔的破裂和压力波会抑制增长。由于正升力元件的体积达到最大值,当空腔与连接的空腔完全脱离水翼表面时,升力达到峰值。除了流体冲击作用下的前缘剪切断裂外,阻力因素的演化与升力相似。研究表明,力元法可以很好地揭示空化作用引起的力演化机制。结合空腔演化,分析了瞬态升阻演化。正升力元素主要集中在空腔表面,随着空腔的发展而输送,但分离空腔的破裂和压力波会抑制增长。由于正升力元件的体积达到最大值,当空腔与连接的空腔完全脱离水翼表面时,升力达到峰值。除了流体冲击作用下的前缘剪切断裂外,阻力因素的演化与升力相似。该研究表明,力元方法可以很好地揭示空化作用引起的力演化机制。正升力元素主要集中在空腔表面,随着空腔的发展而输送,但分离空腔的破裂和压力波会抑制增长。由于正升力元件的体积达到最大值,当空腔与连接的空腔完全脱离水翼表面时,升力达到峰值。除了流体冲击作用下的前缘剪切断裂外,阻力因素的演化与升力相似。该研究表明,力元方法可以很好地揭示空化作用引起的力演化机制。正升力元素主要集中在空腔表面,随着空腔的发展而输送,但分离空腔的破裂和压力波会抑制增长。由于正升力元件的体积达到最大值,当空腔与连接的空腔完全脱离水翼表面时,升力达到峰值。除了流体冲击作用下的前缘剪切断裂外,阻力因素的演化与升力相似。该研究表明,力元方法可以很好地揭示空化作用引起的力演化机制。由于正升力元件的体积达到最大值,当空腔与连接的空腔完全脱离水翼表面时,升力达到峰值。除了流体冲击作用下的前缘剪切断裂外,阻力因素的演化与升力相似。该研究表明,力元方法可以很好地揭示空化作用引起的力演化机制。由于正升力元件的体积达到最大值,当空腔与连接的空腔完全脱离水翼表面时,升力达到峰值。除了流体冲击作用下的前缘剪切断裂外,阻力因素的演化与升力相似。该研究表明,力元方法可以很好地揭示空化作用引起的力演化机制。
更新日期:2021-01-01
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