同©大学 Tongji University Variation of drag coefficient Cpwith Reynolds Number Re 10000 1000 S : 100 Region Region Region Region (a) (b) (c) :(d 10 6ed 0.44 0.1 0.2 ·500 0.01 0.01 0.1 1 10 100 1000 10000 1000001000000 Reynolds Number,Re For Region (a) 104<Re<0.2 For region (b) 0.2<Re<500to1000, For region (c) 500<Re<2*105, In region (d) Re<2*I05Tongji University For Region (a) 10-4＜Re ＜0.2； For region (b) 0.2 ＜Re ＜500 to 1000； For region (c) 500＜Re ＜2*105； In region (d) Re ＜2*105 Variation of drag coefficient CD with Reynolds Number Re