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机构地区:[1]北京空气动力研究所
出 处:《流体力学实验与测量》1998年第1期38-43,共6页Experiments and Measurements in Fluid Mechanics
基 金:国家自然科学基金
摘 要:对后掠角70°尖前、后缘三角翼进行了低速风洞试验。用五分量内式应变天平测量了静、动态气动力。考核了动态试验装置、测试系统和数据采集/处理方法。模型静态法向力测量结果跟文献[1]实验符合;在一定折合频率范围内作大振幅动态运动时,法向力和俯仰力矩出现过冲量;动态失速延迟;上仰和下俯运动产生的气动载荷形成滞后环。用俯仰气动阻尼表示滞后度并确定振荡稳定特性。文中还对实验结果用傅里叶分析作了预测,二者趋势一致。A series of lowspeed wind tunnel tests on a 70° sween sharp leadingedge delta wing were conducted.Forces and moments were measured at both static and dynamic conditions using five component internal strain gauge balance to assess the validity of dynamic rig,apparatus,data acquisition system and reduced method.Static results compared well with the previous experimental findings.Large amplitude dynamic motion was produced by sinusoidally oscillation the model over range of reduced frequencies.Substantial force and moment overshoots,a delay in dynamic stall and hysteresis loops between the values of aerodynamic loads in upstroke and downstroke motion were observed.All of which were strong functions of the reduced frequency.The degree of hysteresis which determines oscillating stability were represented by the pitch aerodynamic damping parameter.Results obtained from Fourier functional analysis were compared with the original test data,the variation tendency of them are consistent.
分 类 号:V211.41[航空宇航科学与技术—航空宇航推进理论与工程]
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