Effect of Rotation on Flow and Heat Transfer Characteristics in Co-rotating Cavity at Low Reynolds Number
To investigate the effect of rotation on the flow and heat transfer characteristics in a turbine co rotating cavity at high altitude and low Reynolds numbers,numerical simulation analysis was conducted with an impact Reynolds number of 1 × 103 and 2 × 103 and rotational Reynolds numbers ranging from 0 to 8.8 × 105 for the flow field structure and heat transfer coefficient distribution inside the rotating cavity.The results indicate that the jet can effectively impact the target surface at low rotational Reynolds num-bers,but cannot effectively impact the target surface at high rotational Reynolds numbers.The recovery temperature of the target surface is evenly distributed along the radial direction,and when the impact Reynolds numbers are 1 × 103 and 2 × 103,the rotational Reynolds number is increased from 0 to 8.8 × 105,the average recovery temperatures of the target surface are increased by 45 K and 40 K respectively,and the average heat transfer coefficients of the target surface are increased by 44％and 50％,respec-tively.As the radial position increases,the heat transfer coefficient of the target surface first increases and then decreases;as the rotational Reynolds number increases,the heat transfer coefficient on the tar-get surface increases,with the maximum heat transfer coefficient at R/Ra=0.81 on the target surface.
co-rotating cavityimpinging jetheat transfer characteristicslow Reynolds numberrota-tional Reynolds number
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