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首页> 外文期刊>Journal of visualization >Visualization of flow through planar double divergent nozzles by computational method
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Visualization of flow through planar double divergent nozzles by computational method

机译：通过计算方法通过平面双发散喷嘴的流动可视化

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The double divergent nozzle is a type of altitude adaptive nozzle. The double divergent nozzle does not have any mechanical parts, leading to reduced nozzle weight and requires minimum modifications to the existing launch system. The planar double divergent nozzle is a type of double divergent nozzle, having a rectangular cross section. The present study involved the numerical analyses of a single divergent nozzle, and five double divergent nozzle geometries. The flow is simulated on five different double divergent sections having the same area ratio, but with different inflection angles/extension length. All geometries are studied with similar boundary conditions. Flow pattern, wall static pressure, side load, and specific impulse are studied for pressure ratios ranging from 1.5 to 8.5 with cold air as working fluid. The results obtained are compared with a single divergent nozzle having the same area ratio. It is inferred that the flow pattern, side load, and specific impulse of a double divergent nozzle have a strong dependence on the inflection angle.
机译：双发散喷嘴是一种高度自适应喷嘴。双发散喷嘴没有任何机械部件，导致喷嘴重量减小并且需要对现有发射系统的最小修改。平面双发散喷嘴是一种双发散喷嘴，具有矩形横截面。本研究涉及单个发散喷嘴的数值分析，以及五个双发散喷嘴几何形状。在具有相同面积比的五个不同的双发散部分上模拟流动，但具有不同的拐角角度/延伸长度。使用类似的边界条件研究所有几何形状。流动图案，壁静压，侧载和特定脉冲，用于压力比，压力比为1.5至8.5，用冷空气作为工作流体。将获得的结果与具有相同面积比的单个发散喷嘴进行比较。推断，双发散喷嘴的流动图案，侧载和特定脉冲具有对拐角的强依赖性。

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