A Lagrangian analysis of scale effects on sheet cavitation inception
A Lagrangian analysis of scale effects on sheet cavitation inception
复制标题
片状空化起始尺度效应的拉格朗日分析
DOI：
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发表时间：
2019
期刊：
影响因子：
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通讯作者：
S. Beelen
中科院分区：
文献类型：
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作者：
M. V. Rijsbergen;S. Beelen
翼片和螺旋桨上的片状空化通常是由自由流气泡引起的。因此，由于气泡频谱(大小与浓度)、螺旋桨直径和转速的不同，空化开始时会出现尺度效应。为了更好地了解这种敏感性，采用二维拉格朗日跟踪方法计算了在叶片截面上产生空化的自由流气泡的轨迹和径向动力学。通过改变气泡的初始半径和初始位置来计算系统的一系列条件。结果表明，可引起空泡的初始气泡半径范围从0.03到至少600m(全尺寸螺旋桨)，减小到5-160m(小螺旋桨模型)。如果在空化设备中存在足够大小的气泡，这并不能解释为什么在模型规模的螺旋桨上片状空化的开始通常是被禁止的。然而，气泡动力学计算确实显示，在小螺旋桨模型上，气泡增长明显较少。
Sheet cavitation on foils and propellers is often initiated by free-stream bubbles. Consequently, scale effects on cavitation inception occur due to differences in the bubble spectrum (size vs. concentration), propeller diameter and rotation rate. To better understand the sensitivities, a 2D Lagrangian tracking method is used to compute the trajectories and radial dynamics of free-stream bubbles that cause cavitation on a blade section. Systematic series of conditions are computed by varying the initial radius and the initial position of a bubble. It is shown that the range of initial bubble radii that can cause cavitation decreases from 0.03 to at least 600 m for a full-scale propeller, to 5 – 160 m for a small propeller model. If sufficient bubbles in this size range are present in a cavitation facility, this does not explain why sheet cavitation inception is often inhibited on model-scale propellers. However, the bubble dynamics computations did show significantly less bubble growth on the small propeller model.
DOI：
10.1017/cbo9781107338760
发表时间：
1995-02
期刊：
FUZZ-IEEE'99. 1999 IEEE International Fuzzy Systems. Conference Proceedings (Cat. No.99CH36315)
影响因子：
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作者：
C. Brennen
通讯作者：
C. Brennen