開孔分布對空腔流動特性的分析
發(fā)布時間：2019-05-28 10:51
【摘要】：開孔分布是影響空腔流動的一個重要因素。為了對開孔空腔流動有更深的認識,采用大渦模擬(LES)的方法,以Suboff艇體母線建立二維模型,研究4種開孔分布對空腔流動阻力,頻譜特性及內(nèi)外流交換的影響。對計算結(jié)果的分析表明,由于艇體表面的壓力分布不同,孔附近產(chǎn)生縱向壓力差,促使空腔內(nèi)外流動交換,增加主艇體首尾壓差阻力,進而使得總阻力增大。計算結(jié)果表明艇體阻力增加與內(nèi)外流交換的密切相關(guān),開孔位于中部時總阻力增量最小,內(nèi)外流增量最小,開孔均勻分布時引起內(nèi)外流流動交換劇烈,阻力增量最大,而且開孔引起總阻力波動幅值增加,頻率分布特性發(fā)生相應(yīng)的改變,開孔使得大幅波動頻帶變寬,可以預(yù)測噪聲強度增加,頻帶變寬。
[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.
【作者單位】： 華中科技大學(xué)船舶與海洋工程學(xué)院;
【分類號】：O35
本文編號：2486990
[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.
【作者單位】： 華中科技大學(xué)船舶與海洋工程學(xué)院;
【分類號】：O35
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