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在对流槽中对对流边界层(CBL)温度场实验研究的基础上,进一步尝试通过实验技术测量速度场并分析研究CBL中的速度场特征.在应用PIV测量技术时选用铝粉作示踪粒子.实验证明了在混合层中速度分布明显具有对流边界层热泡特性;混合层顶部的速度分布很好地反应出夹卷层的结构特征;湍流速度特征量的垂直分布合理,与野外实测结果和类似的对流槽实验结果接近:误差分析表明示踪粒子的跟随性良好,粒子速度的测量结果能真实地反应流体的运动特征,从而得证了分析结果的可靠性.“,”Based on the research of the convective boundary layer (CBL) temperature field in a convectivetank, this paper studies the characteristics of the CBL velocity field in the convective tank. Aluminiumpowder (400 order s) is used as a tracer particle in the application of the particle image velocimetry (PIV)technique. The experiment demonstrates: the velocity distribution in the mixed layer clearly possessesthe characteristics of CBL thermals; the velocity distribution in the top zone of the mixed layer showsentrainment layer characteristics; the vertical distribution of turbulent characteristic variables is reasonable,which is similar to field observations and other tank results; the error analysis demonstrates the validityof aluminium powder, which implies the reliability of the results.