直、斜孔排气对航行体绕流流动影响:Part 2流体动力特性
发布时间：2018-12-27 10:27
【摘要】：数值研究了直、斜孔排气对采用等压排气技术的水下垂直运动航行体绕流流场特性的影响。结果表明,排气孔附近及其下游流场可分为上游高压区、后缘的过膨胀-压缩区、下游近似等压区、膜尾处的逆压及顺压梯度区等五个区域;等压区范围与气膜的气相区、混合相区重合,分别通过气相区内气体顺流速度降低、混合相区内流体逆流速度降低而得到等压特性;斜孔排气时的水流与气流间相互作用减弱,排气速度及其轴向分量、流量显著增加,等压气膜形成速度、影响范围大幅提高。
[Abstract]:The effect of straight and oblique orifice exhaust on the flow field characteristics of underwater vertical moving vehicle with isobaric exhaust technology is studied numerically. The results show that the flow field near the exhaust hole and its downstream can be divided into five regions: the upstream high pressure region, the overexpansion compression region of the rear edge, the approximate isobaric region downstream, the reverse pressure at the tail of the membrane and the pressure gradient region. The isobaric region coincides with the gas phase region of the film and the mixed phase region. The isobaric characteristic is obtained by the decrease of the downstream velocity of the gas in the gas phase region and the decrease of the countercurrent velocity of the fluid in the mixed phase region. The interaction between the flow and the airflow decreases, the exhaust velocity and its axial component, the flow rate increase significantly, and the isobaric film formation velocity increases greatly.
【作者单位】： 哈尔滨工业大学能源科学与工程学院;北京宇航系统工程研究所;
【基金】：国家自然科学基金委创新研究群体(No.51421063)
【分类号】：O357.5
本文编号：2392923
[Abstract]:The effect of straight and oblique orifice exhaust on the flow field characteristics of underwater vertical moving vehicle with isobaric exhaust technology is studied numerically. The results show that the flow field near the exhaust hole and its downstream can be divided into five regions: the upstream high pressure region, the overexpansion compression region of the rear edge, the approximate isobaric region downstream, the reverse pressure at the tail of the membrane and the pressure gradient region. The isobaric region coincides with the gas phase region of the film and the mixed phase region. The isobaric characteristic is obtained by the decrease of the downstream velocity of the gas in the gas phase region and the decrease of the countercurrent velocity of the fluid in the mixed phase region. The interaction between the flow and the airflow decreases, the exhaust velocity and its axial component, the flow rate increase significantly, and the isobaric film formation velocity increases greatly.
【作者单位】： 哈尔滨工业大学能源科学与工程学院;北京宇航系统工程研究所;
【基金】：国家自然科学基金委创新研究群体(No.51421063)
【分类号】：O357.5
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