Numerical simulation of two experiments for studying propeller exciting forces

Numerical simulation of two experiments for studying propeller exciting forces
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螺旋桨激振力研究两次实验的数值模拟

DOI:
10.1080/17445302.2018.1430667
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发表时间:
2018-02
影响因子:
2.1
通讯作者:
Huaixin Zhang
Huaixin Zhang
中科院分区:
工程技术4区
文献类型:
--
作者:
Huilan Yao;Huaixin Zhang

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摘要在船模试验中,螺旋桨通常在名义尾流中工作以测量激振力,而螺旋桨的来流与在船体后工作时的来流不同,这可能导致不同的结果。采用数值方法模拟了两个实验:一个是在特殊设计的船尾后模拟螺旋桨,将名义尾流设置在速度入口边界,并考虑自由表面;另一个是在整个船体模型后模拟螺旋桨。结果表明,尾后螺旋桨模拟得到的单个桨叶轴向力幅值低于预估值,而整个螺旋桨的横向力和垂向力幅值高于预估值,但差异较小。两种方法预测的船体表面脉动压力幅值基本相同。
ABSTRACT In model tests, propellers are usually operated in nominal ship wake to measure exciting forces, and the incoming flow to propellers is different from that when the propeller is working right after the hull, which may lead to different results. Numerical methods were applied for simulations of two experiments: one is to simulate the propeller after a specially designed stern, and the nominal ship wake is set to the velocity inlet boundary, and free surface is considered; the other is to simulate the propeller right after the entire hull model. Results show that the amplitude of axial force of a single blade from the simulation of propeller after the stern is under-predicted, while the amplitudes of transverse and vertical forces of the whole propeller are over-predicted, but the differences are small. The amplitudes of fluctuating pressures on the hull surface predicted by the two approaches are basically the same.
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