绕流线型回转体通气两相流动的非定常特性

发布时间：2018-02-26 15:22

本文关键词： 通气两相流回转体通气率脉动脱落　出处：《哈尔滨工业大学学报》2017年07期 　论文类型：期刊论文

【摘要】：为深入了解通气两相流的流场结构及水动力特性,在循环水洞中利用高速全流场显示技术及六分力天平测量技术,对绕流线型回转体通气两相流动的非定常特性进行实验研究.结果表明:弹身区域流场呈均匀分布的水气两相混合状态,流动稳定,非定常特性不明显;尾部区域流场较为紊乱,非定常特性明显,尾部空泡涡的周期性脱落引起模型阻力系数出现周期性脉动现象.绕流线型回转体通气两相流动的非定常特性与雷诺数及通气率有关.通气率的增加可降低由于尾部空泡涡的脱落而引起的阻力系数的波动幅度,而对尾部涡的脱落频率无明显影响;随着雷诺数的增加,由于尾部空泡涡的脱落而引起的阻力系数的波动幅度减小,尾部涡的脱落频率增加.
[Abstract]:In order to understand the flow field structure and hydrodynamic characteristics of aerated two-phase flow, high-speed full-flow field display technique and six-component force balance measurement technique are used in circulating water tunnel. The unsteady characteristics of the aerated two-phase flow around the streamline rotary body are studied experimentally. The results show that the flow field in the projectile body is uniformly distributed in the mixture of water and gas, the flow is stable and the unsteady characteristic is not obvious. In the tail region, the flow field is disordered, and the unsteady characteristic is obvious. The periodic shedding of the tail cavitation vortex causes the periodic pulsation of the model resistance coefficient. The unsteady characteristics of the two-phase flow around the streamline rotary body are related to the Reynolds number and the ventilation rate. The increase of the ventilation rate can be reduced by the increase of the aeration rate. The amplitude of the drag coefficient caused by the falling off of the tail cavitation vortex, With the increase of Reynolds number, the fluctuation amplitude of drag coefficient caused by the shedding of tail cavitation vortex decreases, and the shedding frequency of tail vortex increases.
【作者单位】：北京机械设备研究所;
【分类号】：O359

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