通气对云状空化不稳定性调节中的控制参数与影响规律研究
Parameters and influence of gas injection on modification of cavitation stability
查看参考文献18篇
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文摘
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水下高速运动的航行体面临着空化现象,出现空泡的脱落和溃灭,带来噪声、振动等不稳定性影响.向空泡中通入气体是调节空化流场不稳定性的重要手段.本文对通气空化进行量纲分析,得到了影响通气空化的无量纲参数.通过数值模拟研究了与通气相关的两个重要无量纲数—通气与来流的质量流量之比和动量流量之比对流场稳定性的的影响.数值研究表明,通气质量流量对于空化的演化过程有较大的影响.随着通气质量流量的增大,泄气方式从空泡泄气转变为气层泄气.通气质量流量的提高可削弱回射压力,增强航行体表面压力的稳定性,但同时会增加阻力值以及阻力的波动性.通气的动量流量对空化的演化和航行体的压力影响较小,但是在一定程度上可以降低阻力,提高阻力的稳定性. |
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其他语种文摘
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Cavitation occurs around high-speed underwater vehicles, which induces shedding and collapse of bubbles with noises, vibration, etc. Gas-injection is an important method to adjust the unstability of cavitating flow field. In this paper, dimensionless quantities are got though the dimensional analysis on ventilated cavitation. Among these dimensionless quantities, the ratios of mass flux and momentum flux of the gas-injection to those of the main flow are crucial in ventilated cloud cavitation. Numerical simulation is carried out on these two dimensionless quantities. The results indicate that gas-injection mass flux has greater impact on the evolution of ventilated cavitation than momentum flux. As gas-injection mass flux increases, the form of gas entrainment changes from bubbles to air-layer. Besides, increase of gas-injection mass flux can reduce the high pressure at the closure of the cavity and improve the pressure stability while it can also lead to the rise of drag of the vehicle. Gas-injection momentum flux has little effect on the evolution and pressure. Increase of gas-injection momentum flux can reduce drag of the vehicle. |
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来源
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中国科学. 物理学
, 力学, 天文学,2015,45(3):034703-1-034703-11 【核心库】
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DOI
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10.1360/sspma2014-00334
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关键词
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通气空化
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不稳定性
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量纲分析
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质量流量
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动量流量
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地址
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中国科学院力学研究所, 中国科学院流固耦合系统力学重点实验室, 北京, 100190
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1674-7275 |
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学科
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水路运输 |
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基金
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国家自然科学基金资助项目
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文献收藏号
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CSCD:5374927
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