气流中颗粒阻力系数和升力系数讨论

对于颗粒在气流中处于跃移状态时的受力问题,许多学者已作过论述。但是,不同学者在建立跃移模型时所选取的力并不完全相同。而且在力的计算方面见解不一,突出表现在阻力和升力的确定上。鉴于此,文章以阻力、阻力系数和升力、升力系数为出发点论述了阻力系数和升力系数的来源与本质,并针对当前广泛使用的阻力和升力公式进行评价,指出这些公式在应用中的缺陷。建议采用阻力系数和升力系数参数,通过实验测量来确定阻力和升力系数,以精确计算颗粒所受的阻力和升力。并对这种方法的合理性进行了讨论。

DISCUSSION ON DRAG COEFFICIENT AND LIFT COEFFICIENT OF SALTATION PARTICLES IN AIR FLOW

In the sphere of learning, there are many views about the forces which saltating particles are subject to in air flow, but the forces in saltating models established by scholars are not the same totally, and the main difference is the computation of drag and lift force. The paper has evaluated the drag and lift computing formulas being widely used in the present and pointed out the limitation in appling. Having discussed the source and nature of drag coefficient and lift coefficient, it was suggested to use the two coefficient in the formulas. The two coefficients can be determined by experiment.