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首页> 外文期刊>Heat Transfer Research >LARGE EDDY SIMULATION OF FLUID INJECTION UNDER TRANSCRITICAL CONDITIONS: EFFECTS OF PSEUDOBOILING
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LARGE EDDY SIMULATION OF FLUID INJECTION UNDER TRANSCRITICAL CONDITIONS: EFFECTS OF PSEUDOBOILING

机译：跨临界条件下流体注射的大型涡流模拟：伪磁性的影响

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摘要

Cryogenic nitrogen injected into a supercritical environment is numerically studied by large eddy simulation to explore the influence of pseudoboiling on the jet evolution and mixing process. For comparison, the same model is simulated in ideal-gas conditions with the same initial profiles of density and velocity. The results show that the turbulent kinetic energy and vorticity distributions in both cases are nearly the same indicating that the dominant eddies and the production and dissipation of the turbulent kinetic energy are not directly affected by the pseudoboiling phenomenon. Moreover, the axial velocity distributions in the two cases are also similar, revealing that the pseudoboiling has little effect on turbulent transport mechanisms. However, the density distribution is evidently influenced by the pseudoboiling. Because of the existing of pseudoboiling effects, the most thermal energy absorbed from the surroundings is spent to expand the jet volume, rather than to increase its temperature, so the transcritical fluid is entrained deeply along the axial and radial directions. As a result, before the pseudocritical temperature is reached, the mean profiles of axial and radial density distributions change more slowly in comparison with the ideal-gas condition. Consequently, the mass transport mechanism is considered to be influenced by the pseudoboiling under transcritical conditions.
机译：通过大型涡旋模拟进行数值研究了注入超临界环境中的低温氮，以探讨假磁性对喷射演化和混合过程的影响。为了比较，在具有相同密度和速度的理想气体条件下模拟相同的模型。结果表明，两种情况下的湍流动能和涡旋分布几乎相同，表明主导的漩涡和湍流动能的产生和耗散不受伪斑秃的现象的直接影响。此外，两种情况下的轴向速度分布也相似，揭示了伪磁性对湍流运输机制影响不大。然而，密度分布显然受到假磁性的影响。由于伪磁性效果的存在，从周围吸收的最热能膨胀以扩展喷射体积，而不是提高其温度，因此跨临界流体沿轴向和径向深深夹带。结果，在达到伪科率温度之前，与理想气体状况相比，轴向和径向密度分布的平均轮廓变化得更慢。因此，认为传质机制受泛临界条件下假斑的影响。

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