气冷叶片表面局部对流换热系数的数值计算

本文提出了联立求解二维可压缩边界层方程组和稳定导热方程的迭代法,从而修正了文献1]假定物体表面温度等于来流总温的局限;同时提供了用这种方法计算气冷叶片表面局部对流换热系数的完整的FORTRAN程序。文中用近似积分法求解边界层方程组,用有限元素法计算叶片的稳定温度场。算例的结果与有关的理论及实验结果相接近。

NUMERICAL CALCULATION OF LOCAL CONVECTIVE HEAT TRANSFER COEFFICIENTS OVER AIR-COOLED VANE SURFACES

An iterative method for solving two-dimensional compressible boundary layer equations and steady state equations of heat conduction simultaneously is presented, and also a FORTRAN program for calculation of the local convec-tive heat transfer coefficients over air-cooled vane surface by means of this method is provided. The approximate integral method is used for solving boun- dary layer equations end the finite element method is applied to calculating the steady temperature field of the blade.The input of the program consists of geometry of the blade, pressure or velocity distribution of gas flow external to the boundary layer, entrance flow conditions, internal cooling conditions, nodal numbers and coordinates of the elements. The output includes all principal boundary layer parameters, such as heat transfer coefficients and temperature distribution on the surface, and temperature distribution inside the blade. A numerical example has been calculated and the results are favourably compared with the theoretical and experimental data given by other authors.