湍流预混滞止火焰冷态流场的实验研究

EXPERIMENTAL STUDY ON NONREACTING FLOW FIELD OF TURBULENT PREMIXED COMBUSTION IN STAGNATION FLOW

本文建立了预混滞止火焰燃烧实验装置,采用激光多普勒技术对湍流冷态流场进行了诊断。对测量的速度信息进行了分析和处理,得到了该测点的欧拉时间关联函数和积分时间尺度,并通过傅立叶转换得出湍流冷态流场的湍谱特性。该实验结果和数据处理方法为将来的热态实验提供了基础数据和技术支持。

Experimental system for study on turbulent premixed combustion in stagnation flow was introduced in this paper. The nonreacting flow field of the system was diagnosed with Laser Doppler Anemometry (LDA). Processing of the raw velocity data presented the Euler temperai correlation function and integral time scale. With the help of isotropic turbulence assumption and Taylor s frozen flow hypothesis, turbulent power density spectrum was obtained through Fourier transform of the correlation function. The result...