初期Taylor弥散实验观察

本文利用激波管所能产生的瞬时定常流场,观察了一种具有间断初始密度分布的物质在这个流场中 Taylor 弥散过程.实验中所测量的物质,是空气中的 CO_2成份;测量手段是红外光谱吸收法;所观察到的过程发生在无量纲时间<0.07的范围内.实验数据与理论结果的比较表明:湍流 Taylor 弥散在初始阶段具有一定的对称性质.

Experimental Observation of Early Stage Taylor Dispersion

Taylor dispersion process of initial density distribution with stepped change was observed in short-duration steady flow field of a shock-tube.The substance measured was the component CO_2 in air.The measurement was carried out by means of infrared spectrums absorption method.The physical process observed in within a duration less than 0.07 dimensionless time.The comparison of measured data with theoretical results shows that turbulent Taylor dispersion is of symmetrical manner in its early stage.