飞机地面空调车蒸发器几种典型翅片强化换热效果的仿真比较

Simulation Comparison of Effect of Enhanced Heat Transferof Typical Fins of Evaporator in Aircraft Ground Air-conditioning Carts

为了提高飞机地面空调保障的保障效率,节省保障时间,对蒸发器的几种典型翅片的强化换热效果进行了研究,以确定不同种类翅片换热系数的大小,分析各种翅片的强化换热效果强弱。为此,选取了平直形、开缝形、三角形波纹形和正弦波波纹形等4种典型形式的换热器翅片,建立了4种翅片下的换热系数计算模型,利用Sim ulink仿真工具建立了用于换热系数计算的数学模型,并进行了仿真计算与分析。研究结果表明:与其它3种形式的换热器翅片相比,采用平直形翅片的飞机地面空调车蒸发器具有更高的换热系数,在蒸发器换热面积相同时,能够产生更好的制冷换热效果,进而节约航空兵部队和空军场站的飞行保障时间,提高飞行保障效率。

To enhance the effectiveness and save the time of the support of aircraft ground air-conditioning carts, a research on the effect of enhanced heat transfer of several typical fins of evaporators is carried on to make sure of numerical values of coefficients of heat transfer of different kinds of fins and to analyze their effect of enhanced heat transfer. Therefore, four typical fins including fiat, slotted, triangle corrugated and sinusoidal corrugated are selected and a computational model of coefficients of heat transfer is built. What＇s more, a mathematical model used for the compute of the coefficients is built based on Simulink. Also, a simulation calculation and analysis is carried on. The research result shows that, compared with the fins of the other three shapes, the fiat fins can make the evaporators in aircraft ground air-conditioning carts achieve higher coefficient of heat transfer. When the evaporators＇ areas of heat transfer are same, the aircraft ground air-conditioning carts can bring better effect of refrigeration and heat transfer, further, save the support time of air units and air force stations and enhance the support effectiveness.