基于LDA的矩形巷道测风站风速测定与校正实验研究

针对传统接触性瞬时测风方法未能体现风流脉动性及随机性的特点，在15组不同断面平均风速下，采用非接触式湍流测试手段激光多普勒测速仪（LDA），对测风站巷道断面中垂线上24个测点的风速进行测试。实验表明，断面测点瞬时速度时间序列极不规则，但速度大小服从正态分布，具有规则的统计规律。基于湍流统计平均后，测风站断面某点的测点风速与断面平均风速呈线性关系，经验证，通过校正系数，可根据断面任意一点风速值来确定断面平均风速的大小。研究表明，LDA测量技术可以精准测试巷道流场的湍流特性，基于统计平均的结果为井下测风站风速传感器的校正提供一种新的技术途径。

Experimental study on determination and correction method of wind speed in wind station of rectangular roadway based on LDA

Aiming at the problem that traditional contact instantaneous wind measurement method failed to embody the characteristic of pulsation and randomness for wind flow, the non-contact turbulence measurement means of Laser Doppler Anemometer (LDA) was used to measure the wind speeds of 24 measuring points on the perpendicular bisector of roadway section in wind station under 15 groups of different sectional average wind speed. Experimental results showed that the instantaneous speed sequence of sectional measuring points is highly irregular, but the speed vector obeys normal distribution with regular statistical regularity. The wind speed of certain measuring point has a linear relation with the sectional average wind speed in the wind station based on statistical average of turbulence. After verification, the sectional average wind speed can be determined by the wind speed of any measuring point on the section through correction coefficient. It showed that LDA measurement technology can accurately measure the turbulence characteristics of flow field in the roadway. The results by statistical average provide a new technical way for the correction of wind speed sensors in the underground wind station.