论文部分内容阅读
利用孔板平动法生成湍流 ,通过调节平板孔径的大小和驱动电机的转速来达到在定容燃烧弹内生成不同频段湍流特性的目的 .运用小波包分析法对容弹内气流速度进行了时 频分析 .结果表明 ,容弹内部存在极强的循环平均流 ,湍流主要处于 4 0 0~ 16 0 0Hz的频率段 ,它的能量衰减期一般不超过 6 0ms .同时 ,也得出了容弹内湍流的产生、发展与平板孔径和电机转速之间的关系 .
Turbulence was generated by the flat plate orifice method, and the turbulent characteristics of different frequency bands generated in the fixed-volume combustion bomble were achieved by adjusting the size of the plate aperture and the rotational speed of the drive motor.The time-frequency analysis The results show that there is a very strong circulation average flow inside the bomb, the turbulence is mainly in the frequency range of 400 ~ 1600Hz, and its energy decay period is generally not more than 6 0ms. At the same time, The emergence, development and the relationship between plate aperture and motor speed.