开孔分布对空腔流动特性的分析

发布时间：2019-05-28 10:51

【摘要】：开孔分布是影响空腔流动的一个重要因素。为了对开孔空腔流动有更深的认识,采用大涡模拟(LES)的方法,以Suboff艇体母线建立二维模型,研究4种开孔分布对空腔流动阻力,频谱特性及内外流交换的影响。对计算结果的分析表明,由于艇体表面的压力分布不同,孔附近产生纵向压力差,促使空腔内外流动交换,增加主艇体首尾压差阻力,进而使得总阻力增大。计算结果表明艇体阻力增加与内外流交换的密切相关,开孔位于中部时总阻力增量最小,内外流增量最小,开孔均匀分布时引起内外流流动交换剧烈,阻力增量最大,而且开孔引起总阻力波动幅值增加,频率分布特性发生相应的改变,开孔使得大幅波动频带变宽,可以预测噪声强度增加,频带变宽。
[Abstract]:The distribution of holes is an important factor affecting the flow of cavities. In order to have a deeper understanding of the flow in the open cavity, the two-dimensional model is established by using the large vortex simulation (LES) method and the Suboff hull bus is used to study the effects of four kinds of hole distribution on the flow resistance, spectrum characteristics and internal outflow exchange of the cavity. The analysis of the calculation results shows that due to the different pressure distribution on the surface of the hull, the longitudinal pressure difference occurs near the hole, which promotes the flow exchange inside and outside the cavity, increases the head and tail pressure difference resistance of the main boat body, and then increases the total resistance. The calculation results show that the increase of hull resistance is closely related to the internal and external flow exchange. When the hole is located in the middle, the total resistance increment is the smallest and the internal outflow increment is the smallest. When the hole is evenly distributed, the internal outflow flow exchange is violent and the resistance increment is the largest. Moreover, the amplitude of total resistance fluctuation increases and the frequency distribution characteristics change correspondingly. The opening makes the large fluctuation frequency band wider, which can predict the increase of noise intensity and the broadening of frequency band.
【作者单位】：华中科技大学船舶与海洋工程学院;
【分类号】：O35

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