平面预混滞止火焰冷态流场湍流特性研究

 本文建立了预混滞止火焰燃烧实验装置，采用激光多普勒测速方法，对平面预混滞止火焰的冷态流场的湍流特性进行了流场相干测量并展开了分析。通过对射流轴线上的湍流度进行测量发现，靠近滞止板的绝对湍流度呈现加速上升的趋势。采用多点相干速度测量的结果表明，靠近滞止板的湍流积分长度尺度逐渐降低。经分析，是由于滞止流动轴线上的流线受到压缩而产生的结果。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。

Study on Turbulent Characteristics of Cold Flow Field of Premixed Stagnant Flame

Experimental system of study on the turbulent premix ed combustion in stagnation flow is introduced in this paper.The non-reacting flo w field of the system is diagnosed with Laser Doppler Anemometry (LDA).The measu rement shows that the absolute turbulence increases with the laser probe approac hing the stagnant panel.The contrary tendency appears in the integral turbulent length scale which is measured with multipoint correlating velocity measurement. It is conjectured to be the result of compressed streamline along the axis of th e stagnant stream.The experimental result and the data processing method provide the database and technical support for the further study on reacting flow.