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首页> 外文会议>IUTAM Symposium on Turbulent Mixing and Combustion, Jun 3-6, 2001, Kingston, Ontario, Canada >DYNAMICS CONTROL OF JETS IN CROSSFLOW Direct numerical simulations experiments
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DYNAMICS CONTROL OF JETS IN CROSSFLOW Direct numerical simulations experiments

机译：横流射流的动力学与控制直接数值模拟与实验

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摘要

The structure of a jet in crossflow and its mixing have been studied through detailed direct simulations, and the findings were verified by experiments. Using a newly developed pseudo-spectral code, simulations have been performed both with and without sinusoidal forcing at Strouhal numbers in the range St_d = fU_j/d = 0.1-0.64. Based on the simulation results, which show substantial entrainment and mixing enhancements with lower frequency forcing, experiments have been performed for unforced and forced jets with jet Strouhal numbers up to St_d = 0.2. The simulations and experiments indicate that forcing at the lower end of the frequency range considered in the numerical results, namely St_d = 0.1-0.26, is most effective for increased mixing and entrainment. Finally, we assess the benefits of the controlled flow states using a variety of time-averaged and unsteady mixing metrics.
机译：通过详细的直接模拟研究了横流中射流的结构及其混合，并通过实验验证了这一发现。使用新开发的伪谱码，在St_d = fU_j / d = 0.1-0.64范围内的Strouhal数下，无论有无正弦强迫都进行了仿真。基于模拟结果，这些结果显示出夹杂物和混合气体的增强作用以及较低的频率强迫，已经对射流Strouhal数高达St_d = 0.2的无力和强迫射流进行了实验。仿真和实验表明，在数值结果中考虑的最低频率范围St_d = 0.1-0.26的强迫对于增加混合和夹带最为有效。最后，我们使用各种时间平均和不稳定的混合指标来评估受控流状态的好处。

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