提出了利用流体力学原理在热量表基表进水口设置导流片，来调整水流方向、推动叶轮按预定方向旋转，以及在叶轮式顶盖径向位置设置调节筋条，来调节基表脉冲当量的新方法；开发了专用流量芯片YMS3723B的控制程序，实现了流量信号的准确、可靠采集。对相关研究具有重要的指导作用。

用实验的方法验证了RNG k-ε紊流模型模拟厢式货车外部流场的计算精度明显高于标准k-ε紊流模型；给出了某国产厢式货车外部流场的计算结果，着重分析了当厢式货车基本参数变化时，尾流特性的变化情况。通过计算和分析得出了尾流旋涡的位置和强度与气动阻力的关系，对厢式货车气动外形的设计具有指导作用。

In this paper, the differences in the characteris-tics of airflow around the van-body truck and of the aerodynamic drag, which were caused by the installation of a wind deflector, were studied by experimentally and numerically. The results show that after the installation of the deflector, the airflow around the top and bottom of the truck becoms smooth, the in-tensity of tail-vortex is weakened and its contribution area less-ened. It also indicates that the aerodynamic characteristics of the airflow are changed distinctly and the aerodynamic drag is re-duced considerably. The effect of the thin-wall deflector is better than the solid one in decreasing the drag. It is also concluded that proper design of the gap between the deflector bottom and the top of the driver cab can enhance the effect of the deflector in reduc-ing drag.

The aerodynamic characteristics of the van-body truck were studied by means of theoretical analysis, numerical simu-lation and wind tunnel experiments. The concept of critical length was presented for the van-body truck in wind tunnel experiments, the proper critical Reynolds number was found and the effects of ground parameters in ground effect simulation on the aerodynamic measure-ments were examined. It shows that two structure parameters, van height and the gap between the cab and the van, can obviously influ-ence the aerodynamic characteristics, and the additional aerodynamic devices, the wind deflector and the vortex regulator in the rear, can considerably reduce the aerodynamic drag of the van-body truck. Numerical simulations provided rich information of the flow fields around the van-body trucks.

通过一个简单模型对圆孔和条形孔的泄压减阻特性进行探讨，分别采用标准κ-ε模型对不同流量下的流动状态进行模拟计算，通过计算找到合适的开孔尺寸和形状，并应用于实际生产中，以减少旋翼武机械的压损。