Numerical analysis of cavitating propeller and pressure fluctuation on ship stern using a simple surface panel method “SQCM”
Numerical analysis of cavitating propeller and pressure fluctuation on ship stern using a simple surface panel method “SQCM”
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DOI：
10.1007/s00773-012-0208-8
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发表时间：
2013-01
影响因子：
2.6
通讯作者：
T. Kanemaru;J. Ando
中科院分区：
文献类型：
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作者：
T. Kanemaru;J. Ando
本文提出了一种空泡螺旋桨压力脉动的计算方法。该方法分为两步：第一步是螺旋桨片空泡的计算，第二步是船尾压力脉动的计算。为实用起见，我们将该方法分为两步，但不同时计算这两步。该方法基于一种简单的面元法“SQCM”，该方法很容易满足Kutta条件。根据Lan的准连续涡格法，SQCM由螺旋桨或腔体表面的Hess和Smith类型的源板和曲面上的离散涡组成。在第一步中，利用基于自由流线理论的边界条件求解空腔形状。为了得到螺旋桨叶尖附近准确的空腔形状，在边界条件下考虑了横流分量。在第二步中，我们同时计算空泡螺旋桨和船体表面的流动，从而计算包括螺旋桨与船体相互作用在内的压力脉动。此时，使用由第一步骤获得的计算出的腔体形状在每个时间步长改变腔体形状。计算结果与实验数据在空泡螺旋桨引起的压力脉动的空泡形状、空泡体积和低阶频率分量等方面有较好的一致性。
This paper presents a calculation method for the pressure fluctuation induced by a cavitating propeller. This method consists of two steps: the first step is the calculation of propeller sheet cavitation, and the second step is the calculation of pressure fluctuation on the ship stern. It is for practicality that we divide the method into two steps but do not calculate these steps simultaneously. This method is based on a simple surface panel method “SQCM” which satisfies the Kutta condition easily. The SQCM consists of Hess and Smith type source panels on the propeller or cavity surface and discrete vortices on the camber surface according to Lan’s QCM (quasi-continuous vortex lattice method). In the first step, the cavity shape is solved by the boundary condition based on the free streamline theory. In order to get the accurate cavity shape near the tip of the propeller blade, the cross flow component is taken into consideration on the boundary condition. In the second step, we calculate the cavitating propeller and the hull surface flow simultaneously so as to calculate the pressure fluctuation including the interaction between the propeller and the hull. At that time, the cavity shape is changed at each time step using the calculated cavity shape gotten by the first step. Qualitative agreements are obtained between the calculated results and the experimental data regarding cavity shape, cavity volume and low order frequency components of the pressure fluctuation induced by the cavitating propeller.