| 释义 |
form drag
form drag n (Aeronautics) the drag on a body moving through a fluid as a result of the shape of the body. It can be reduced by streamlining form drag
form drag[′fȯrm ‚drag] (fluid mechanics) The drag from all causes resulting from the particular shape of a body relative to its direction of motion, as of fuselage, wing, or nacelle. At supersonic speed, the drag caused by losses due to shock waves, exclusive of losses due to skin friction. form drag Flow over low drag body. Flow over body with high form drag. Relationship between form drag and speed. Form lines are broken/dotted lines and sketched from visual observations.A type of parasitic drag. Form drag is caused by the frontal area of the airplane components being exposed to the airstream. Drag is caused by the form or shape of the body and, hence, the name. It can be reduced by streamlining the exposed parts and by area ruling. Also called boundary-layer normal-pressure drag. See also area rule. |