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首页> 外文期刊>International Journal of Heat and Fluid Flow >Convective heat transfer characteristics from combined mechanical and supply pulsed radial reattaching jets
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Convective heat transfer characteristics from combined mechanical and supply pulsed radial reattaching jets

机译：机械和供气脉冲径向重附连射流的对流传热特性

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摘要

The heat transfer characteristics of combined mechanically and supply pulsated radial reattaching jets, CPRJR, were documented as a function of nozzle exit angle (0° and 20°), non-dimensional gap height (0.05 and 0.13), non-dimensional flow guide height (0.8 and 1.16), mechanical pulsation rate (5 and 10 Hz), mechanical to supply pulsation rate (1:1, 1:2, 1:3, and 1:4), phase angle (0° and 180°), and Reynolds number (1683 and 2366). Air was forced through a supply pulsation mechanism and then through a pulsated nozzle diverter apparatus. The air impinged on a heated plate where instantaneous heat flux and surface temperature measurements were collected and analyzed on instantaneous, ensemble-averaged, and area-averaged bases. CPRJR heat transfer can be characterized as a frequency interference of mechanical and supply pulsation effects. Significant improvement, up to 72%, over the corresponding mechanical pulsation case was found to occur for a supply-to-mechanical ratio of 3:1 with a phase angle of 0°. In general, the increased heat transfer rates were associated with the an increase in surface-directed momentum caused by increased cycle "on" mass flow rate and corresponding entrainment.
机译：记录了机械和供气脉动径向再连接射流组合的传热特性CPRJR与喷嘴出口角（0°和20°），无量纲间隙高度（0.05和0.13），无量纲导流器高度的关系（0.8和1.16），机械脉动速率（5和10 Hz），机械至电源脉动速率（1：1、1：2、1：3和1：4），相角（0°和180°），雷诺数（1683和2366）。空气被迫通过供气脉动机构，然后通过脉动的喷嘴转向器设备。撞击在加热板上的空气，在该板上收集瞬时热通量和表面温度测量值，并基于瞬时，整体平均和面积平均的基准进行分析。 CPRJR的热传递可以表征为机械和电源脉动效应的频率干扰。发现在相角为0°的电源与机械之比为3：1的情况下，相对于相应的机械脉动情况，可实现高达72％的显着改善。通常，增加的传热速率与增加的“质量”循环流量和相应的夹带引起的表面定向动量的增加有关。

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