材料期刊网

计算域延伸与否对多叶片排计算模式的发展起到了很大的作用。计算域的延伸除了起到使计算域重叠，以便相邻叶片排能相互提供确定应力分布的作用外，还使计算域进出气边远离叶片前后缘，以减少边界反射引起的附加误差。并减少交接边界上周向不均匀性引起的掺混损失。本文探索进行适量延伸，以便在重叠区计算确定应力；不进行背压调整，使用确定应力模型的多叶片排并行计算新的途径

The computational domain extension in the upstream anddownstream of blades plays an important role in the multiblade calculationusing the deterministic stress model. A novel extension method was proposedas follows: The upstream calculation domain of the downstream blade wasextended from the interface plane about a half axial cord, as well as forthe downstream extension for the upstream blade. Both of the two extensionzones constructs a flow channel, within which an inviscid throughflowcalculation allows radial boundary condition profiles to be transferredbetween the inlet of downstream domain and the outlet of the upstreamdomain. There is no need to adjust the back pressure level atcalculation domain outlet for each blade row