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在用于激光束传输和控制模拟实验的湍流池中温度脉动测量结果表明,原始温度变化曲线上有明显的斜坡(ramp)结构.温度三阶及五阶结构函数和理论预计一致,和大气对流边界层的测量结果相似.斜坡结构的出现对二阶结构函数的影响较小,加热面和冷却面附近有明显的猝发现象出现,温度脉动的峰度系数大于3,表现了较大的间歇性。
The results of temperature pulsation measurements in a turbulent flow cell for laser beam propagation and control simulation show a clear ramp structure on the original temperature profile. The third- and fifth-order temperature structure functions are in agreement with the theoretical ones, similar to the atmospheric convective boundary layer. The appearance of slope structure has less influence on the second-order structure function, and obvious burst phenomena appear near the heating surface and cooling surface. The kurtosis coefficient of temperature fluctuation is more than 3, which shows a larger intermittency.