Research on drag reduction mechanism of supercavitation shows that supercavitation can reduce not only the frictiondragcoefficient but also the pressure drag coefficient.
超空泡减阻机理的研究表明：超空泡不仅可以减小回转体的摩擦阻力，还可以减小回转体的压差阻力。
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Based on the achievements obtained. the theoretic formula that determine the rut size of the caterpillar tractor and the frictiondragcoefficientof motion was deduced.