This paper uses the characteristic line method to get the flute.

论文提出了由砂轮特征线求取刀具螺旋槽的方法.

Based on the reflective theory of characteristic line, a model of shock waves formed by repeatedly reflected pressure waves between piston and fixed wall was established.

基于特征线理论推导了特征线经固壁与活塞多次反射后激波形成模型，设计了计算流程图及给出了应用算例。

One-dimensional unsteady flow characteristic line method is adopted to simulate and calculate the unsteady flow process of two-class turbocharged systems in diesel engines.

并完成了柴油机两级涡轮增压不稳定流动过程模拟计算程序的编制，实现了对过程的模拟计算。