烧蚀速率 meaning in English

ablation rate
ablation velocity

The simulations results show that the spoiler is available to make the fuel and the oxidizer coming from the former to stay in the cavity for a long time , to let the fuel and oxidizer mix and burn completely . since there is a high temperature zone forming by vortex in the middle of the motor , it required a restricted thermal protection . the plate with holes decreased the vortex function in the cavity , which could not promote the combustion efficiency , but to decrease temperature in the cavity and be benefit to thermal protection of the wall
计算结果分析表明:扰流板可以使燃料和氧化剂在扰流腔内的滞留时间加长,促进燃料与氧化剂的掺混燃烧,提高燃烧效率,但由于涡流在发动机的中间部位形成了高温燃烧区域,致使局部燃料和绝热层烧蚀速率增大,加大了热防护的难度;孔板结构减弱了扰流腔内回流区的漩流作用,不能增加推进剂燃烧效率,但可以使扰流腔内的温度降低,给壁面热防护带来好处。