水翼间隙非定常涡空化流动的试验和数值研究

发布时间：2017-12-31 16:16

本文关键词：水翼间隙非定常涡空化流动的试验和数值研究　出处：《排灌机械工程学报》2016年10期 　论文类型：期刊论文

【摘要】：采用高速全流场显示技术对水翼叶顶间隙区域非定常旋涡空化流动进行观测,并提出一种旋涡空化模型来对空化流动进行计算.研究结果表明,提出的空化模型可以较好地捕捉非定常泄漏涡空化.此外,基于计算结果对水翼前缘云状附着空化与间隙涡空化的相互作用进行重点分析.结果表明,附着空化的发展和脱落会引起水翼叶顶附近迎背流面压力差值的变化,从而导致叶顶区域射流剪切层空化具有显著的非定常特性;附着空化末端闭合处的压力波动会造成泄漏空化涡强度的波动;附着空化的断裂所引起的吸力面局部高压会导致泄漏空化涡强度的显著降低.
[Abstract]:The high speed visualization of the hydrofoil tip clearance region of unsteady vortex cavitation flow were observed, and proposed a cavitation model to calculate the cavitation flow. The results show that the cavitation model proposed can better capture the unsteady leakage vortex cavitation. In addition, analyzed the interaction based on the calculation results attached cavitation and clearance vortex cavitation of hydrofoil front cloud. The results show that the development of cavitation and loss of attachment will change the hydrofoil near the blade tip attack back flow surface pressure difference, resulting in the tip region of the jet shear layer cavitation has obvious unsteady characteristics; attachment pressure fluctuation at the closed end of cavitation leaks caused by cavitation vortex intensity fluctuation; local high pressure suction surface rupture caused by attached cavitation will lead to a significant reduction in the leakage vortex cavitation intensity.

【作者单位】：北京机电工程研究所;北京理工大学机械与车辆学院;
【基金】：国家自然科学基金资助项目(51239005,51479002)
【分类号】：TK05
【正文快照】： 赵宇,赵兴安,王国玉,等.水翼间隙非定常涡空化流动的试验和数值研究[J].排灌机械工程学报,2016,34(10):835-840,846.ZHAO Yu,ZHAO Xing'an,WANG Guoyu,et al.Experimental and numerical investigations of unsteady tip leakage vortex cavitatingflows around a hydrofoil[J

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