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CFD Study of Effects of Geometry Variations on Flow in a Nozzle

机译：CFD研究几何变化对喷嘴中流量的影响

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AbstractReynolds-Averaged Navier-Stokes simulations have been performed to investigate the effect of nozzle geometry on the turbulence characteristics of incompressible fluid flow through nozzles at Reynolds number of approximately 50,000. Four nozzles have been considered: a baseline nozzle and three modified nozzles (extended, grooved and ringed). The flow in these nozzles has been simulated using different turbulence closure models, including Spalart-Allmaras, variants of k - ε and k - ω, and the Reynolds Stress Model (RSM). By comparison to experimental data, it is shown that the RSM produces more accurate results for the prediction of turbulent fluctuations. The presence of a ring significantly increases both the turbulence intensity and mean velocity at the exit, and requires a much higher inlet pressure to move the fluid through the nozzle. On the other hand, cutting a groove near the exit or extending the nozzle has little effect on the exit flow characteristics.
机译：摘要已经进行了雷诺平均Navier-Stokes模拟，以研究喷嘴几何形状对不可压缩流体流经大约50,000雷诺数的喷嘴的湍流特性的影响。已经考虑了四个喷嘴：一个基准喷嘴和三个改进的喷嘴（延伸，开槽和环形）。这些喷嘴中的流动已使用不同的湍流闭合模型进行了模拟，包括Spalart-Allmaras，k-ε和k-ω的变体以及雷诺应力模型（RSM）。通过与实验数据进行比较，表明RSM产生了更准确的预测湍流波动的结果。环的存在会显着增加出口处的湍流强度和平均速度，并且需要更高的入口压力才能使流体流过喷嘴。另一方面，在出口附近切割凹槽或延长喷嘴对出口流动特性的影响很小。

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