A testing system was designed and implemented to figure out the friction drag of an underwater axisymmetrical vehicle model.
为了研究轴对称回转体水下航行器模型所受到的壁面摩擦阻力，设计并实施了一套测试系统。
Friction drag is the major part of the total drag of a transport, so reducing it is essential for improving the performance and reducing the cost of a transport.
民机受到的摩阻占其总阻力很大比例，减少摩阻对改善民机性能和降低成本具有重要意义。
The underwater high-speed vehicle surfaces are enveloped by cavity entirely or mostly, which reduces skin friction drag and allows the vehicle to obtain high speed.
水下超高速航行体的全部或大部分表面被空泡包裹，使其阻力显著降低而达到高速航行的目的。
Based on the achievements obtained. the theoretic formula that determine the rut size of the caterpillar tractor and the friction drag coefficient of motion was deduced.
笔者将在此基础上．推导出履带式拖拉机的车辙大小的理论公式及其沿疏松土地行走时的运动阻力系数。
Abstract: Friction drag is the major part of the total drag of a transport, so reducing it is essential for improving the performance and reducing the cost of a transport.
摘要：摩擦阻力占民机总阻力的很大比例，减少摩阻对改善民机性能和降低成本具有重要意义。
Research on drag reduction mechanism of supercavitation shows that supercavitation can reduce not only the friction drag coefficient 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。
Experimental and analytical results show that the system can be used to study the friction drag of the vehicle models at certain speed range, which full-fills the design demand.
试验和分析结果表明，该系统在一定的速度范围内可以有效地测试航行器模型所受摩擦阻力，满足了设计要求。
That never changes if there is no air drag or air friction of any kind.
它未曾变过,如果没有空气阻力,或任何摩擦力。
As airfoil thickness is increased, the average pressure drag, affected by leading edge vortex is reduced even to be negative, and meanwhile friction has little increase.
由于前缘涡的影响，翼型厚度增加，平均压差阻力系数变小，甚至会出现负值。
Part of the ship resistance is viscous resistance, which divided into form drag and friction resistance.
船舶航行阻力的一部分为粘性阻力，其中又分为形状阻力和摩擦阻力。
In the engineering project, negative skin friction is the drag force that will reduce the vertical bearing capacity and cause differential settlement of the structure.
工程中由于负摩阻力产生的下拉荷载不仅使桩竖向承载力减小，还会导致结构物的不均匀沉降。
The adding of the drag reduction agent can reduce the friction force of the current and increase the flow speed as well as increase the conveying distance.
引入减阻剂后，可降低湍流磨擦阻力，提高流速。增大输送距离和提高管道输送能力。
It is indicated that the voltage was induced in the films when the rotational electrolytes flow on the carbon nanotube films surface due to electronic friction and electron drag effect.
结果发现，当转动电解液从碳纳米管膜的表面流过时，也会在膜的两端诱导出电势，该电势的大小与电解液的种类、转速、质量浓度和温度等有关。
It is indicated that the voltage was induced in the films when the rotational electrolytes flow on the carbon nanotube films surface due to electronic friction and electron drag effect.
结果发现，当转动电解液从碳纳米管膜的表面流过时，也会在膜的两端诱导出电势，该电势的大小与电解液的种类、转速、质量浓度和温度等有关。
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