Experimental Investigation on the Heat Transfer of Engine Similar Cooling Channel with Different Outflow Rate Allocation

摘要：

A simulated model, generated from actual engine turbine rotor blade interior cooling channel, has been studied for detailed heat transfer coefficient distribution on the pressure surface. This simulated model is a three-pass model, and has three inlets and three outlets. Two outlets are dust holes at the top surface of this channel and the other is impinging jet holes aligned at the trailing edge. Transient thermochromic liquid crystal technique has been applied for the measurement of the heat transfer coefficient distribution on the pressure surface of this model. A transient test was used to acquire the detailed Nusselt number distribution on the pressure surface and spanwise averaged Nusselt number of this simulated model. Results are presented for the nominal channel inlet Reynold numbers, 15000 - 20000, with four different outflow rate allocations. The experimental results show that:(l). when the outflow rate allocation of the first outlet place is increased , the heat transfer on the pressure surface of the first passage is not enhanced obviously, while the heat transfer of the second passage is obviously diminished) (2). as the outflow rate allocation of the first outlet is fixed, different outflow rate allocation between the second outlet place and the third outlet place has no obvious influence on the heat transfer of the first and second passage, but has critical impact on the heat transfer of the third passage;(3). Increasing the nominal channel inlet Reynold number of this model can enhance heat transfer and the Nusselt number distribution pattern is similar when the outflow rate allocation is same. Based on the experimental study of this model, as much as decrease the outflow rate allocation of the first outlet place and make suitable outflow rate allocation between the second outlet place and the third outlet place can acquire more uniform heat transfer coefficient distribution on the pressure surface of this model.

关键词： heat transfer cooling channel rate allocation liquid crystal

作者: LIANG Wei-ying ZHU Hui-ren

作者单位: School of Power and Energy, Northwestern Polytechnical University, Xian, China

会议类型: 国际会议

会议名称: 4th International Symposium on Jet Propulsion and Power Engineering(第四届喷气推进与动力工程国际会议 ISJPPE2012)

会议地点: 西安

会议语种:英文

页码: 268-274

在线出版日期: 2012-09-10（万方平台首次上网日期，不代表论文的发表时间）