论文部分内容阅读
根据相似理论放大的模型,实验研究了带有出流孔内流通道带孔—侧壁面的对流换热特性。实验采用加热钢带法,主要在主流雷诺数为2.5×104～10×104,出流比为1.0～4.0的范围内,测量了出流孔附近的换热系数分布,重点分析了主流雷诺数和出流比对壁面对流换热的影响规律。实验结果显示出流作用使出流孔下游区域内的换热得到强化。主流雷诺数一定时,随出流比的提高此区域换热强度提高,影响范围也扩大;出流比一定时,不同主流雷诺数下,带出流孔壁面换热强度与不带出流孔壁面换热强度的比值(Nu/Nu0)基本一致,换热被强化的程度无显著变化。
According to the model enlarged by the similar theory, the convective heat transfer characteristics of the perforated side wall with outflow holes were experimentally studied. The experiment uses the heating steel strip method, mainly in the mainstream Reynolds number of 2.5 × 104 ~ 10 × 104, the outflow ratio of 1.0 to 4.0 in the range, measured the exit hole near the heat transfer coefficient distribution, focusing on the analysis of the mainstream Reynolds number And outflow ratio on the wall convection heat transfer law. The experimental results show that the effect of the flow is to intensify the heat transfer in the downstream area of the orifice. When the mainstream Reynolds number is constant, with the increase of the outflow ratio, the heat exchange intensity in this area is increased and the influence range is also expanded. When the outflow ratio is constant, the heat exchange intensity with or without outflow holes at different mainstream Reynolds numbers The ratio of wall heat transfer intensity (Nu / Nu0) is basically the same, and the degree of heat transfer enhancement is not significantly changed.