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在旋成体模型表面粘贴铝基沟槽蒙皮,研究沟槽表面对模型阻力的影响。给出基于来流单位雷诺数的沟槽尺寸无量纲公式,用于设计沟槽齿高和齿宽,依据试验风洞的单位雷诺数范围,选定3种尺寸的沟槽进行减阻试验。结果表明,在旋成体表面湍流流动区域顺流向布置沟槽,当沟槽齿高和齿宽的无量纲值h+、s+均小于25时,在小迎角下具有减阻作用,当s+约为15时减阻效果最明显,可减小约3%～4%的阻力。
Aluminum-based grooved skin was attached to the surface of spin body model to study the effect of grooved surface on model resistance. A dimensionless formula of the groove size based on the Reynolds number of the incoming flow unit is given to design the groove tooth height and tooth width. Three types of grooves are selected for the drag reduction test according to the unit Reynolds number range of the test wind tunnel. The results show that when the dimensionless values h + and s + of groove height and tooth width are less than 25, the grooves are arranged downstream in the turbulent flow area on the surface of spin body, and have a drag reduction effect at a small angle of attack. When s + is about 15 when the drag reduction effect is most obvious, can reduce the resistance of about 3% to 4%.