基于附壁效应的斯特林机多孔介质加热器传热特性研究

针对传统斯特林机加热器加热管管外出现“热点”现象,提出斯特林机的多孔介质型加热器,以提高加热管外传热平均温度。通过改进纽曼与包克附壁射流模型,提出斯特林机加热器多孔介质模型。通过本多孔介质模型下流动传热特性与Fu x.方程下的对流换热特性对比、同时分析不同流速与孔径下的加热管换热系数,验证出：在附壁效应下,多孔介质模型对碳化硅等大孔径、内部结构均匀且形状变化平滑的泡沫型多孔介质有较好的拟合特性。

Study on Heat Transfer Characteristics of Stirling Machine Porous Media Heater Based on Attaching Effect

Aiming at the "hot spot" phenomenon in the traditional stirling machine heater tube, the porous medium heater of stirling machine was put forward to improve the average heat transfer temperature outside the heating tube. By improving the model of Newman and Baker ''s attached jet, the porous medium model of stirling machine heater is proposed. The heat transfer characteristics of the porous media model are compared with the convective heat transfer characteristics under the Fu x. equation, and the heat transfer coefficient of the heating pipe under different flow rate and aperture is analyzed. It is proved that the porous media model has a good fitting characteristics for large pore size, uniform internal structure and smooth shape of the porous foam medium under the attaching effect.