颗粒越大与收缩段壁面碰撞越剧烈，无粒子区越大。
Big size particles had serious collision with wall of convergent region, and the region without particles was larger.
对二维面碰撞简化为一般的点碰撞和点碰撞方程的混合求解法进行了推导。
Two dimensional surface impact can be simplified into general point impact and mixed solution method of point impact equation are produced in this paper.
空气涡流对燃油与空气混合的促进作用主要发生在油束与燃烧室壁面碰撞以后。
The function of air motion, which promotes fuel mixing with air, is great mainly after fuel spray impingement.
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