结构化网格在气热耦合计算中的应用

Application of Structured Grids in a Gas-heat Coupled Calculation

采用商用网格生成器生成结构化气热耦合计算网格,应用多块网格技术提高网格质量并对流动边界层和热边界层等流场参数变化较大的区域进行加密,同时采用高精度的数值传递方式在网格块间进行数值传递,从而保证高精度差分格式在网格块间不被破坏,提高耦合计算效率。最后通过MarkII叶片气热耦合的计算,并将耦合计算结果与实验值进行比较,中径处压力沿叶型分布两者相差在1%范围内,而中径处温度沿叶型分布在大部分地方两者相差在4%范围内。

A structured grid for calculating gas-heat coupling was established by adopting a commercial grid generator,and multi-block grid technology was employed to improve the grid quality.The areas of flow-and thermal boundary layers etc.subject to a relatively big change of flow field parameters have been refined.In the meantime,a high-precision numerical transfer mode was used to perform a numerical transfer among various grid blocks,thereby ensuring the high-precision difference scheme among the grid blocks not to be destroyed and thus enhancing the coupled calculating efficiency.Finally,through a gas-heat coupled calculation of Mark II blades and a comparison of the calculation results with test ones,it has been found that the difference of the pressure distribution along the blade profile at the pitch diameter was in a range of 1%,while that of the temperature distribution in a majority of places,in a range of 4%.