摘要
本文通过UDF对通入脉冲气流的拉瓦尔喷管扩张段进行研究,发现当入口压力变化时,喷管扩张段会出现多重堆叠的压力波,外侧形成边界不断变化的激波。扩张段及之后气流速度随之震荡,离开喷管后的气体也会在一定范围内保持周期性速度变化,并对外部产生周期性冲击。
In this paper,the expansion section of Laval nozzle with pulse airflow is studied by udf.It is found that when the inlet pressure changes,multiple stacked pressure waves appear in the expansion section,and a shock wave with changing boundary is formed.The velocity oscillates in the expansion section and after that,and the gas leaving the nozzle will maintain periodic velocity change in a certain range,and will produce periodic impact.
作者
毕方淇
董晓
Bi Fangqi;Dong Xiao(Zibo Agricultural Machinery Research Institute,Shandong Zibo 255000)
