微孔阵列式绕回转体气泡减阻实验研究  

Experimental Study of Bubble Drag Reduction with Micro-hole Array on an Axisymmetric Model

作　　者：黄磊[1] 彭雪明[1] 王生捷[1] 何春涛[1] 段磊[1] 

机构地区：[1]北京机械设备研究所,北京100039

出　　处：《兵工学报》2017年第2期313-318,共6页Acta Armamentarii

摘　　要：为了研究回转体模型气泡减阻变化规律,深入了解通气两相流场的流动特性,采用高速摄像观察系统及测力系统相结合,进行了微孔阵列式绕回转体气泡减阻实验研究。结果表明:根据气泡沿下游发展过程中出现的不同流动形态,可将通气两相流场划分为3个区域:稳定区、脉动区、回流区;随着通气率的增加,稳定区及脉动区空泡份额增加,模型摩擦阻力持续减小,直至饱和通气率;回流区分离点向下游移动,尾部压力增加,至突变临界通气率处,回流区流动形态发生突变,流动介质由水气混合转变为气体为主,致使尾部压力出现突增,继而导致气泡减阻率出现突增。To explore the bubble drag reduction of axisymmetric model and understand the characteristics of two-phase flows, the bubble drag reduction with micro-hole array on an axisymmetric model is experi- mented by using a high speed camera system and a force-measuring system. The experimental results show that the two-phase flow field can be divided into three regions, i. e. , stable region, pulsating region and recirculation region, according to the different flow patterns of bubbles in the process of their devel- opment. With the increase in ventilation rate, the void fractions in the stable region and the pulsating re- gion increase, and the friction resistance of the model decreases continuously until a saturated ventilation rate is achieved. The flow separation point of recirculation region moves downstream and the tail pressure increases as air entrainment coefficient increases. The flow pattern of the recirculation zone changes at the critical ventilation rate, and the flowing medium is changed from water- gas mixture into gas, which re- sults in a sudden increase in the tail pressure, thereby leading to the sudden increase in the bubble drag reduction.

关 键 词：兵器科学与技术 回转体 气泡减阻 通气率 空泡份额 

分 类 号：TJ630.1[兵器科学与技术—武器系统与运用工程]