【摘要】 在对定容燃烧弹内的湍流进行循环分辨分析的基础上 ,计算了湍流的强度、自相关系数、标准一维能谱密度以及泰勒微观时间尺度。同时研究了传统集平均湍流研究方法和循环分辨分析法两者具有较大偏差的根源 ,从频率成分和尺度大小两方面刻画了湍流脉动与集平均脉动之间的区别和联系。通过比较不同“时窗”宽度和不同“相关窗”宽度条件下计算出的湍流能谱、自相关系数等湍流参数 ,找到了“时窗”和“相关窗”各自比较合适的折中值。更多还原

【Abstract】 In this article,based on cycle resolved analysis for the turbulence in a constant volume combustion bomb,the turbulent characteristic parameters such as turbulence intensity,autocorrelation coefficients,1 D energy spectral density function and Taylor micro time scale,etc.have been obtained.At the same time,the sources that make the differences in the two results of ensemble average and cycle resolved analysis are investigated.On the both sides of frequency contents and time scales,the differences and relationships between turbulence and ensemble average fluctuation are obtained.Through calculating and comparing the turbulent characteristics for different time window width and correlation window width,the tradeoff values of them have been acquired.更多还原