ボックスファンの内部流れの非圧縮性LES解析と放射音の音響解析

抄録

In this study, it is clarified the influence of the total number and resolution of the computational grids on the accuracy of the numerical analysis by using the large eddy simulation for a small box fan. It is analyzed the accuracy by using six cases of computational grids with different resolutions and total numbers of the grids. These grids have different resolution in the casing strut and the grid type near the blade-wall surface. As a result, application of the prism-type mesh near the blade-wall surface has been found crucial for resolving thin laminar boundary layers, and thus improving the prediction accuracy of the performance curve. Far field sound prediction are performed by Curle’s equation⁽⁵⁾ or acoustic analysis with calculated fluid force.