hole number meaning in English

孔数

Feature of black hole numbers and its magic generation
黑洞数的性质与它神奇的衍生法
Several conclusions about black - hole numbers
关于黑洞数问题的几个结论
Film cooling of the surface of a gas turbine blade was studied in a large - scale low - speed opening wind tunnel according to actual requirement of the design of aero - engine . the surface of a gas turbine blade was cooled by cylindrical holes in the experiment , with the hole number of fifteen in stator and eight in rotor
应航空发动机设计的要求，在大尺寸低速叶栅传热风洞中分别对发动机涡轮导向叶片和动叶表面的气膜冷却特性进行了研究，具体研究在不同气膜孔出流时，在不同主流雷诺数和吹风比情况下叶片表面局部换热系数的分布规律。