采用换热器降低冷却空气温度是提高航空发动机性能的有效途径。为了提高换热器性能,需要对三重周期极小曲面(TPMS)在换热器上的应用进行分析。本文采用数值仿真的方法,研究在航空发动机工作条件下5种TPMS换热器的流动换热特性,分析对传热系数和压降的影响,总结出了空气侧和燃油侧的摩擦系数和努塞尔数与雷诺数的关联式,并与螺旋套管(TTHC)换热器进行对比分析。结果表明:在传热性能方面,沿横向距离变化,TPMS换热器传热系数呈周期性变化,在冷侧,TPMS换热器的努塞尔数排列顺序为Primitive>I-WP>Gyroid>Diamond>Fischer-Koch S。在阻力性能方面,I-WP换热器摩擦系数最低,压降损失最小。与TTHC换热器相比,5种TPMS换热器流动情况更加复杂,努塞尔数和摩擦系数均得到提高,I-WP换热器摩擦系数提升的最低为0.705,Primitive换热器努塞尔数系数提升的最高为833.66。

Heat exchangers are an excellent approach to increase the performance of aircraft engines by lowering the temperature of the cooling air. The application of Triple Periodic Minimal Surface (TPMS) to heat exchangers needs to be analyzed in order to improve the performance of heat exchangers. In this paper, numerical simulation is used to study the flow heat transfer characteristics of five different types of TPMS heat exchangers under aero-engine operating conditions, to analyze the effects on the heat transfer coefficient and pressure drop, to summarize the friction coefficients and the correlation equations between Nusselt number and Reynolds number for the air side and the fuel side, and to make a comparison with the tube-in-tube helical coil (TTHC) heat exchanger. The results show that the heat transfer coefficient of the TPMS heat exchanger varies periodically along the lateral distance, and the Nussell number of the TPMS heat exchanger is ranked in the order Primitive>I-WP>Gyroid>Diamond>Fischer-Koch S on the cold side. The results demonstrate that the TPMS heat exchanger"s heat transfer coefficient fluctuates frequently throughout the lateral distance. The I-WP heat exchanger exhibited the lowest friction coefficient and pressure drop loss in terms of resistance performance. The five TPMS heat exchangers have more complex flow conditions and improved Nusselt number and friction coefficients, with the I-WP heat exchanger having the lowest friction coefficient enhancement of 0.705 and the Primitive heat exchanger having the highest Nusselt number coefficient enhancement of 833.66.

中国民航大学中央高校基本科研业务费用（3122019187）