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首页> 外文会议>ASME Turbo Expo: Turbomachinery Technical Conference and Exposition >EFFECTS OF HIGH HEATING LOADS ON UNSTEADY FLOW AND HEAT TRANSFER IN A COOLING PASSAGE WITH A STAGGERED ARRAY OF PIN FINS
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EFFECTS OF HIGH HEATING LOADS ON UNSTEADY FLOW AND HEAT TRANSFER IN A COOLING PASSAGE WITH A STAGGERED ARRAY OF PIN FINS

机译：高加热载荷对冷却通道的不稳定流动和传热的影响

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Time-accurate 3-D CFD simulations based on the SST-SAS turbulence model were performed to study the effects of heat load on the unsteady flow and heat transfer in a cooling duct with a staggered array of short pin fins. For this duct, the static pressure at its exit is maintained at 25 bars, and the cooling air that enters has a temperature of 673 K with a flow rate that produces a Reynolds number of25,000. To examine the effects of heat load, the following isothermal wall temperatures were studied: 678 K, 873 K, 1073 K, and 1,273 K, which give rises to heat loads that range from 15 kW/m2 to 1.5 MW/m2. Results obtained show high heat loads to cause considerable changes in the temperature of the cooling flow along the duct, which causes significant changes in density and velocity as well as viscosity and thermal conductivity. These changes along the duct were found to affect the locations where unsteady flow separation take place around the pin fins, the magnitude of the vorticity shed in the wakes, and the shedding Strouhal number. These unsteady flow mechanisms in turn strongly affect the nature of the surface heat transfer. A correlation formula for the heat transfer, which accounts for the effects of heat loads, was developed.
机译：执行基于SST-SAS湍流模型的时间准确的3-D CFD模拟，以研究热负荷对冷却管道中的不稳定流量和传热的影响，具有交错的短销翅片。对于该管道，其出口处的静压保持在25巴，并且进入的冷却空气具有673k的温度，其流速产生雷诺数为25,000。为了检验热负荷的影响，下面等温壁温度进行了研究：678 K，873 K，1073 K和1273 K，这给上升到热负荷该范围从15千瓦/ m 2至1.5兆瓦/平方米。得到的结果显示出高热量负荷，以沿着管道的冷却流的温度引起相当大的变化，这导致密度和速度的显着变化以及粘度和导热性。发现这些沿着管道的变化会影响不稳定流动分离在销翅片周围发生的位置，在唤醒中旋转的涡度的大小和脱落斯特鲁茨数。这些不稳定的流动机制反过来强烈影响表面传热的性质。开发了用于热荷载作用的传热的相关公式。

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