带有微型涡轮的旋转盘腔局部换热特性

Experimental investigation of local heat transfer characteristic in a rotating cavity with micro-turbine

关键词:  涡轮  旋转盘腔+  冷却  传热  努赛尔特数

Key words:  Turbine  Rotating cavity~+  Cooling  Heat transfer  Nusselt number

摘要:

对带有微型涡轮的转-转系涡轮盘腔进行了换热试验。微型涡轮的主要作用是使冷气通过上游涡轮盘的反旋喷嘴推动涡轮盘转动,从而降低气流的总焓,同时改变气流的旋转速度,形成更好的冷却环境。试验采用热膜加热、热电偶测温和遥测仪采集数据的方法进行,上下游转盘同时加热。试验结果表明:随着无量纲质量流量、旋转雷诺数和浮升力的增大,努赛尔特数增大,换热效果增强。这为进一步的数值计算和优化提供了依据。

Abstract:

Heat transfer experiments were carried out in a rotor-rotor co-rotating cavity system with micro-turbine. The de-swirl nozzles on the upstream disk supply the cooling air which decreases its total enthalpy after doing work to drive the rotor, and the effects of heat transfer are enhanced by this method. The heating steel foil was adopted and the 62 points of temperatures are measured through the rotating telemetry. Both the upstream and down stream disk were heated. The results show the Nusselt number increases with the increasing of dimensionless flow rate,rotational Reynolds number and buoyancy force and it supplies the basis for the next numerical simulation and optimum design.