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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 >Numerical and experimental study of turbulent impinging twin-jet flow
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Numerical and experimental study of turbulent impinging twin-jet flow

机译：湍流撞击双喷流的数值与实验研究

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The two dimensional impinging circular twin-jet flow with no-cross flow is studied numerically and experimentally. The theoretical predications are carried out through numerical procedure based on finite volume method to solve the governing mass, momentum, turbulent kinetic energy and turbulent kinetic energy dissipation rate. The parameters studied were jet Reynolds number (9.5 x 10(4) <= Re <= 22.4 x 10(4)), nozzle to plate spacing (3 <= h/d <= 12), nozzle to nozzle centerline spacing (l/d = 3, 5 and 8) and jet angle (0 degrees <= theta <= 20 degrees). It is concluded that the stagnation primary point moves away in the radial main flow direction by increasing the jet angle. This shift becomes stronger by increasing the nozzle to nozzle centerline spacing (l/d). A secondary stagnation point is set up between two jets. The value of pressure at this point decreases by decreasing Reynolds number and/or increasing the jet angle. The sub atmospheric region occurs on the impingement plate. It increases strongly by increasing Reynolds number and decreases as the jet angle and/or a nozzle to plate spacing increases. The spreading of jet decreases by increasing nozzle to plate spacing. The intensity of re-circulation zone between two jets decreases by increasing of h/d and jet angle. The increase of turbulence kinetic energy occurs within high gradient velocity. (c) 2006 Elsevier Inc. All rights reserved.
机译：数值和实验研究了二维无交叉冲击圆形双射流。通过基于有限体积法的数值程序进行理论预测，以求出控制质量，动量，湍动能和湍动能耗散率。研究的参数是射流雷诺数（9.5 x 10（4）<= Re <= 22.4 x 10（4）），喷嘴到板的间距（3 <= h / d <= 12），喷嘴到喷嘴的中心线间距（l / d = 3、5和8）和喷射角（0度<= theta <= 20度）。结论是，通过增加喷射角，停滞的主要点沿径向主流方向移动。通过增加喷嘴到喷嘴的中心线间距（l / d），此偏移会变得更强。在两个喷嘴之间设置了一个辅助停滞点。通过减小雷诺数和/或增大喷射角，此时的压力值减小。低于大气压的区域出现在冲击板上。它通过增加雷诺数而强烈增加，并随着射流角度和/或喷嘴与印版的间距增加而减小。射流的扩散通过增加喷嘴与板的间距而减小。通过增加h / d和射流角度，两个射流之间的回流区强度会降低。湍流动能的增加发生在高梯度速度内。 （c）2006 Elsevier Inc.保留所有权利。

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