来流速度分布对蒸发式冷凝器性能的影响

Effect of Inlet-Air Velocity Distribution on Performance of Evaporative Condenser

在适当简化模型的基础上，采用可实现湍流动能-扩散率模型、强化壁面处理方法和速度-压力耦合的SIMPLE算法，探索了来流速度分布及其对传热传质与流阻性能的影响．结果表明：计算流体力学模拟与实验偏差不超过15％；当来流速度在1．5～4．5m／s范围内时。排热量变化率为19．3％，压降变化率为9．4％；当来流进入角在-45°～45°时，排热量变化率为15．5％，压降变化率为18．0％；合适的气流入口流速为2．4～3．3m／s．适宜方向为-15°-20°．

This paper investigates the inlet-air velocity distribution and its influence on the heat and mass transfer as well as the flow resistance by reasonably predigesting the physical model. In the investigation, the realizable k-ε model, the enhanced wall treatment and the SIMPLE arithmetic for the velocity-pressure coupling are adopted. The results indicate that （ 1 ） the error between the simulated and experimental results is within the range of 15% ; （2） when the velocity of the inlet air ranges from 1.5 to 4.5m/s, the deviation of heat transfer duty and the pressure drop reach 19.3% and 9.4%, respectively; （3） when the velocity angle of the inlet air ranges from -45° to 45° the deviation of heat transfer duty and the pressure drop respectively reach 15.5% and 18.0% ; and （4） the optimal velocity and velocity angle of the inlet air are 2.4 to 3.3 m/s and -15°to 20° respectively.