基于循环分辨分析的湍流特征参数计算法

Computing Method to Calculate Turbulent Characteristic Parameters Based on Cycle-Resolved Analysis

采用不同的孔板结构和不同的驱动电机转速在定容燃烧弹内生成具有不同的湍流特性参数的气流 ,并用热线风速仪进行了测量。在循环分辨分析的基础上 ,计算分析了它们各自的湍流强度、积分时间尺度和时频谱密度。结果表明 ,电机转速越大 ,孔板总通孔面积越小 ,则湍流越强 ,积分时间尺度越小 ;对于不同的孔板结构和电机转速 ,湍流能量分布明显不同。

The airflow of different turbulent characteristic parameters is produced in a constant volume bomb using different moving perforated plate and different driving motor ′s rotating speed.Velocity measurements are performed with HWA and the data are processed with cycle resolved analysis technology.So as to review the development of turbulence and compare them for different perforated plate and different motor ′s speed,turbulent characteristic parameters,such as turbulent intensity,turbulent integral time scales and time frequency spectral density function,are investigated.The results show that the structure of perforated plate and motor ′s speed have strong influences on turbulent generation and development,i.e.the smaller the area of all bores in perforated plate and the faster the motor ′s speed,the stronger turbulence is and the smaller turbulent integral time scales are.The turbulent energy percentage distributions in every frequency band are different.