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首页> 外文期刊>International Journal of Heat and Fluid Flow >Turbulent fuel-air mixing study of jet in crossflow at different velocity ratios using LES
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Turbulent fuel-air mixing study of jet in crossflow at different velocity ratios using LES

机译：湍流燃料 - 空气混合研究不同速度比使用LES的交叉流出

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摘要

In order to study the mixing mechanism of fuel and air in gas turbine, large eddy simulation has been used to investigate the methane jet-in-crossflow with the velocity ratio (R) of 1.5 and 4. This study aims to explore the formation mechanism of vortices such as the hairpin vortices, hovering vortices and horseshoe vortices, the relationship between the fuel-air mixing and flow characteristics at different velocity ratios. The numerical methods in the present work are firstly validated with the experimental data in terms of mean and root mean square values of velocity. For R = 4, the shear layer vortices, horseshoe vortices, counter-rotating vortices pairs (CVP) and wake vortices can be observed, while the jet shear layer cannot be observed for R = 1.5. The hairpin vortices originating from the vortice-ring are lifted and shed from the downstream of the jet-outlet due to Kutta-Joukowski lift. The hairpin vortices are similar to CVP. The horseshoe vortices in R = 1.5 and 4 are formed due to the blockage of the jet (CH4) and the crossflow (air) respectively, and its evolution is associated with the hovering vortices which only exist for R = 1.5. The uniform index and probability density function are used for quantitative analysis of the mixing performance. The uniform index at X/D = 0 (fuel-inlet) and at X/D = 25 (outlet) are 0.033 and 0.335 for R = 1.5 and 0.130 and 0.047 for R = 4. For R = 4, the jet penetration is higher and the deflection angle of jet is smaller than that in case of R = 1.5. Higher R will provide more region for mixing, therefore uniform index is higher and the mixing is more uniform in the downstream.
机译：为了研究燃气轮机中的燃料和空气的混合机理，已经使用大涡模拟探讨了1.5和4的速度比（R）的甲烷射流流出。本研究旨在探索地层机制涡流等发夹涡旋，悬停涡流和马蹄形涡流，燃料 - 空气混合与不同速度比的流动特性之间的关系。本工作中的数值方法首先以实验数据在速度和速度的均值值方面验证。对于r = 4，可以观察到剪切层涡流，马蹄形涡旋，反向旋转涡流对（CVP）和唤醒涡流，同时不能观察到射流剪切层r = 1.5。由于Kutta-Joukowski Lift，从喷射出口的下游抬起并脱落的发夹涡旋。发夹涡旋类似于CVP。由于射流（CH4）的堵塞和十字流（空气）分别形成r = 1.5和4中的马蹄形涡流，并且其演化与悬停涡流相关，该悬停涡流仅存在于r = 1.5。均匀指标和概率密度函数用于定量分析混合性能。 X / D = 0（燃料入口）和X / D = 25（出口）的均匀指数为0.033和0.335，对于r = 4，r = 4.对于r = 4，喷射渗透为0.130和0.047。射流的较高和偏转角小于R = 1.5的情况下。较高的R将提供更多的混合区域，因此在下游中的混合更高并且混合更均匀。

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