| 引用本文: | 赵小宇,向敏,刘波,等.通气空泡与超音速尾喷流耦合作用实验研究.[J].国防科技大学学报,2021,43(5):53-60.[点击复制] |
| ZHAO Xiaoyu,XIANG Min,LIU Bo,et al.Experimental study on the coupling effect of ventilated cavity and supersonic tail jet[J].Journal of National University of Defense Technology,2021,43(5):53-60[点击复制] |
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| 通气空泡与超音速尾喷流耦合作用实验研究 |
| 赵小宇,向敏,刘波,张为华 |
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(国防科技大学 空天科学学院, 湖南 长沙 410073)
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| 摘要: |
| 基于开放式水洞,构建了通气空泡与超音速尾喷流耦合作用实验系统。设计了四种可变长度实验模型,重点研究射流与通气空泡相对位置对空泡射流耦合作用机理的影响。针对不同外形实验模型,改变通气流量和射流流量,获得了不同工况下空泡界面瞬态演化规律。通过实验,观察到射流完全补气、射流部分泄气、射流完全泄气三种不同耦合作用模式。进一步结合实验数据和Paryshev理论分析,建立了不同模式下临界转变条件和空泡尺度计算模型。当Ｊ≤０.1 时,空泡长度可用经典空泡经验公式来描述；当0.1<Ｊ<1.5 时,空泡长度分为模型长度和尾部空泡长度两部分,而尾部空泡长度只与无量纲动量比Ｊ有关；当 Ｊ≥1.5时,空泡闭合在喷管出口,空泡长度与模型长度相等。 |
| 关键词: 射流 通气空泡 相对位置 耦合作用 |
| DOI：10.11887/j.cn.202105006 |
| 投稿日期：2021-04-06 |
| 基金项目:国家自然科学基金资助项目(51776221)；国防科技大学校科研基金资助项目(ZK18-02-07) |
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| Experimental study on the coupling effect of ventilated cavity and supersonic tail jet |
| ZHAO Xiaoyu, XIANG Min, LIU Bo, ZHANG Weihua |
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(College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China)
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| Abstract: |
| Based on an open water tunnel, an experimental system for the coupling of ventilated cavity and supersonic jets was constructed. Four variable length experimental models were designed, focusing on the influence of the relative position of the jet and the ventilated cavity on the interaction mechanism. For different experimental models, the ventilation flow and jet flow were changed to obtain the dynamic process of the evolution of the cavity interface under different working conditions. Experiment observed three distinct mechanisms, which were divided into the following types:the jet fully inflated the cavity and the jet partially deflated the cavity; the jet fully deflated the cavity. By combining the experimental results and Paryshev′s theory, the calculation model of the cavity size and critical transition conditions for different mechanism were further constructed. When Ｊ≤0.1, the cavitation length can be described by the classic cavity empirical formula; When 0.1<Ｊ<1.5, the cavitation length is divided into two parts:the model length and the tail cavity length, and the length of the closed cavity from the nozzle outlet is only related to the parameter Ｊ; When Ｊ≥1.5, the ventilated cavity closes at the tail of the nozzle, the cavity length is approximately equal to the model length. |
| Keywords: tail jet ventilated cavity relative position coupling effect |
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