喷口间距对双矩形平行射流流场的影响

发布时间：2018-04-23 23:29

本文选题：PIV + 双射流　；参考：《化工学报》2017年10期

【摘要】：用激光粒子测试仪(PIV)测量了双矩形喷口平行射流的流场特性,研究了不同喷口速度、不同喷口间距下双射流的混合特性。结果表明,喷口速度增大,双射流对称线上速度绝对值增大,但速度最大值出现的位置基本不变。喷口间距增大后,双射流的混合推迟,合并点后移,传递到对称线上的动量减弱,在合并点上的最大速度值减小。间距比与合并点的关系呈线性;但与大间距比相比,小间距比对合并点的影响更为敏感,关联式斜率更大。对湍流特性分析发现,双射流的主要动量传递发生在混合区,喷口间距增大,混合区与喷口的距离增加。
[Abstract]:The flow field characteristics of parallel jet with double rectangular nozzle were measured by laser particle tester (PIV). The mixing characteristics of two jets with different nozzle velocities and different nozzle spacing were studied. The results show that with the increase of nozzle velocity, the absolute value of velocity on the symmetrical line of double jet increases, but the position where the maximum velocity appears is almost unchanged. With the increase of nozzle spacing, the mixing of the two jets is delayed, the merging point is moved backward, the momentum transferred to the symmetry line is weakened, and the maximum velocity value at the merging point is reduced. The relationship between the distance ratio and the merging point is linear, but compared with the large spacing ratio, the small spacing is more sensitive than the combination point, and the correlation slope is larger. It is found that the main momentum transfer of the double jet occurs in the mixing region, the distance between the nozzle and the nozzle increases, and the distance between the mixing zone and the nozzle increases.
【作者单位】：清华大学热能工程系热科学与动力工程教育部重点实验室;
【基金】：国家高技术研究发展计划项目(2015BAA04B01)~~
【分类号】：O358

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