本文選題：PIV + 雙射流　； 參考：《化工學報》2017年10期

【摘要】：用激光粒子測試儀(PIV)測量了雙矩形噴口平行射流的流場特性,研究了不同噴口速度、不同噴口間距下雙射流的混合特性。結(jié)果表明,噴口速度增大,雙射流對稱線上速度絕對值增大,但速度最大值出現(xiàn)的位置基本不變。噴口間距增大后,雙射流的混合推遲,合并點后移,傳遞到對稱線上的動量減弱,在合并點上的最大速度值減小。間距比與合并點的關(guān)系呈線性;但與大間距比相比,小間距比對合并點的影響更為敏感,關(guān)聯(lián)式斜率更大。對湍流特性分析發(fā)現(xiàn),雙射流的主要動量傳遞發(fā)生在混合區(qū),噴口間距增大,混合區(qū)與噴口的距離增加。
[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.
【作者單位】： 清華大學熱能工程系熱科學與動力工程教育部重點實驗室;
【基金】：國家高技術(shù)研究發(fā)展計劃項目(2015BAA04B01)~~
【分類號】：O358

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