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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Investigation of large-scale coherent structures and momentum interference of twin rectangular jets
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Investigation of large-scale coherent structures and momentum interference of twin rectangular jets

机译：对大规模相干结构的调查和双矩形喷射的动量干扰

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摘要

An experimental study was performed to investigate the effects of nozzle spacing between twin rectangular jets on the non-linear momentum interference and spatial evolution of large-scale flow structures. Five test cases of different spacing ratios (S/d(e) = 1.8, 2.8, 3.7, 5.5 and 7.3) were examined. Two-point correlation, joint probability density function and swirling strength were used to characterize the large-scale structures. Turbulent/non-turbulent interface along the inner and outer shear layers were investigated. The results showed that due to the interactions in the merging region, the spatial correlation of streamwise velocity fluctuations was considerably lower along the inner shear layer than along the outer shear layer. As a result of the mixing process, the swirling strength of retrograde vortices generated along the inner shear layer was also lower than that of the prograde vortices. Along the symmetry line, longitudinal and transverse integral length scales increased linearly as the downstream distance from the jets increases. For the longitudinal length scale, the slope of the linear region was independent of the spacing ratio, while for the transverse length scale, the slope increases as the spacing ratio increases. For cases of S/d(e) < 3.7, due to the suppression effects of the adjacent jet, the jump in the conditionally-averaged mean streamwise velocity profile around the turbulent/non-turbulent interface was lower for the inner shear layer compared to the outer shear layer.
机译：进行实验研究，以研究喷嘴间距在双矩形喷射对非线性动量干扰和大型流动结构的空间演变之间的影响。检查不同间距比的五种测试病例（S / D（e）= 1.8,2.8,3.7,5.5和7.3）。双点相关性，联合概率密度函数和旋转强度用于表征大规模结构。研究了沿着内剪切层的湍流/非湍流界面。结果表明，由于合并区域中的相互作用，沿着内剪切层的流动速度波动的空间相关性比沿着外剪切层相当较低。作为混合过程的结果，沿着内剪切层产生的逆行涡流的旋转强度也低于翼片涡流的旋转涡流。沿着对称线，纵向和横向整体长度尺度随着距车喷射的下游距离而增加。对于纵向长度，线性区域的斜率与间距比无关，而对于横向长度尺度，随着间隔比增加而增加。对于S / D（e）<3.7的情况，由于相邻射流的抑制效果，与湍流/非湍流界面周围的条件平均值的平均速度速度截图的跳跃对于内部剪切层较低外剪切层。

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