Numerical simulations on tip clearance flow in Aachen 1?1/2 axial-flow turbine stages are performed. The formation and development of tip clearance flow and tip vortex and the influences on turbine performances are investigated.

• 以Aachen一级半轴流透平为研究对象；采用数值模拟手段对不同动叶顶部间隙情况下的间隙流进行了分析；研究了间隙流和间隙涡的形成、发展形式及其对透平性能的影响.