水下自激脉冲射流装置流场的数值模拟及试验研究

发布时间：2018-05-23 19:13

本文选题：自激脉冲射流 + 流场　；参考：《排灌机械工程学报》2016年03期

【摘要】：利用自行研制的淹没射流试验平台进行水下自激脉冲射流试验,得到水下自激脉冲射流驻点压力的径向和轴向分布,通过建立相应的物理模型和数学模型,对水下自激脉冲射流内外流场进行了数值模拟,得到装置内、外流场的压力和速度分布,并对计算结果进行试验验证.结果表明:自激脉冲射流在非淹没条件下,有明显的低频脉冲发生,而在淹没条件下,部分射流能量消耗在淹没水流中,以致在腔室内难以形成空化,没有产生明显的脉冲,且驻点压力大幅度减小;不同水深的径向压力分布曲线基本是相同的,近似服从高斯正态分布;轴向驻点压力均随靶距的增大而减小,其衰减特性与连续射流及非淹没情况相似,只是其在有围压情况下衰减速度更快;水下自激脉冲射流装置的内部流场存在轴心主射流低压区、两个对称的负压区、碰撞高压区,并在靠近碰撞体的腔体处产生漩涡,其外流场和冲击射流流场相似,但不存在射流核心区.
[Abstract]:The radial and axial distributions of the static pressure of underwater self-excited pulsed jet are obtained by using the self-excited pulse jet test platform, and the corresponding physical and mathematical models are established. The internal and external flow field of underwater self-excited pulsed jet is numerically simulated, and the pressure and velocity distribution of the external flow field in the device are obtained, and the calculated results are verified by experiments. The results show that there are obvious low-frequency pulses in the self-excited pulse jet under non-submerged conditions, while in the submerged condition, some of the jet energy is consumed in the submerged water flow, so it is difficult to form cavitation in the chamber, and no obvious pulse is produced. The radial pressure distribution curve of different water depth is basically the same, which is similar to the normal distribution of Gao Si, and the axial static point pressure decreases with the increase of target distance. Its attenuation characteristics are similar to those of continuous jet and non-submerged jet, except that the attenuation rate is faster under confining pressure, and the internal flow field of underwater self-excited pulse jet device has low pressure region of axial main jet, two symmetrical negative pressure regions and high pressure zone of collision. The vortex is produced in the cavity near the collision body, and the flow field is similar to the impinging jet flow field, but there is no jet core region.
【作者单位】：华北水利水电大学电力学院;
【基金】：国家自然科学基金资助项目(51309099) 水利部公益性行业科研专项经费项目(201201085) 华北水利水电大学创新计划项目(HSCX2014118)
【分类号】：TV131.6

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