摘要
本文介绍了关于气流紊流度对碟形抛物面模型气动力特性影响的风洞实验研究结果。实验是在1.2m×0.8m开口低速风洞中进行的。用更换格栅的方法改变气流的紊流度,通过应变式五分量天平测量了作用在模型上不同俯仰角和偏转角时的阻力、横侧力、俯仰力矩、偏转力矩和倾侧力矩。实验结果表明:气流的紊流度增大会使模型上的气动力和力矩增大,特别是在高紊流度时(ε>10％)尤为显著。
This paper describes an experimental investigation on the effect of free-stream turbulence on the aerodynamic charatcristics of a paraboloidal dish-type model. The experiment was made in the 1.2m ×0.8m low speed wind tunnel. The free-stream turbulence in the working section was changed by turbulence grids. A five component strain gage balance was used to measure two forces and three moments of the model at various angles of elevation and yaw. It is worth noticing that the aerodynamic forces and moments increase with the increase of free-stream turbulence.
关键词
紊流度
抛物面
低速
气动力
风洞
turbulence, parabolic body, aerodynamic characteristics, wind tunnel tests, low speed wind tunnel
