論云中水滴对气流拖带的动力效果

ON THE DRAG EFFECTS OF THE PRECIPITATION PARTICLE ON THE AIR CURRENT IN CONVECTIVE CLOUD

摘要: 本文进一步研究了对流云中,降水貭点对气流的拖带作用.把降水貭点和空气作为混合介貭看待,根据泥砂輸运理論1,重新推导了問題的基本方程組.在这一基础上,分析了問題的常定和非常定解.得到两点主要的結果:1)按云中实际可能出現的含水量数量,通过拖带作用后,可以产生与观測結果同量級的下沉气流强度;2)云中降水泡(降水集中区),在降落过程中,水量将向泡的前沿区集中,由于水量的这种聚集,降水到达地面时有可能出現陣性,即降水强度一开始就很大.

Abstract: In this paper, the drag effects of the precipitation particles on the air current in connective cloud are investigated, by applying the theory of motion of sand particles. It is found that: 1) the downward velocity of air thus produced is reasonable; 2) the precipitation has the character of a shower.