CAJ | 학술논문

为得到雷达天线罩的绕流特性以开展结构设计,采用风洞试验方法研究了2.224 2×106≤Re≤8.896 9×106 范围内变截面正八边形结构表面压力系数周向分布及其随Re数、倾角和风向角的变化规律,以及Re数对结构的气动力和气动力矩系数的影响. 试验结果表明:周向平均压力系数变化较大,且受风向角的影响较为明显,在一定范围内Re数和倾角仅对边界层分离区域压力分布产生作用,而升力系数与阻力系数、升阻比、侧力系数以及气动力矩系数受Re数影响较大,且与风向角的相关性较为显著.
위득도뢰체천선조적요류특성이개전결구설계,채용풍동시험방법연구료2.224 2×106≤Re≤8.896 9×106 범위내변절면정팔변형결구표면압력계수주향분포급기수Re수、경각화풍향각적변화규률,이급Re수대결구적기동력화기동력구계수적영향. 시험결과표명:주향평균압력계수변화교대,차수풍향각적영향교위명현,재일정범위내Re수화경각부대변계층분리구역압력분포산생작용,이승력계수여조력계수、승조비、측력계수이급기동력구계수수Re수영향교대,차여풍향각적상관성교위현저.
In order to obtain wind flow characteristics past a radome for structural design purpose, the distribution of circumferential average pressure coefficient of a regular octagon structure was studied with Reynolds number from 2. 224 2×106 to 8.896 9×106 via wind tunnel experiment, and influence of Reynolds number, inclination and wind di-rection on pressure distribution and influence of Reynolds number on aerodynamic force coefficient and aerodynamic moment coefficient were explored. The experiment results show that the distribution of average pressure coefficient varies more in the circumferential direction and is mainly impacted by wind direction. Reynolds number and inclina-tion only affect the distribution of pressure near the boundary layer separation point with certain limits. Lift coeffi-cient, drag coefficient, lift-drag ratio, side force coefficient and aerodynamic moment coefficient are affected largely by Reynolds number with remarkable dependency on wind direction.