Unsteady Characteristics over Dynamic Delta Wings
A study of flow and frequency characteristics of the leading-edge vortices over a delta wing undergoing pitching up-stop motions is presented. The experiments with the dynamic delta wings were conducted in a water channel and a wind tunnel respectively. Among them, the test of the flow visualization was completed in the water channel with the delta wing with pitching up-stop motions. The result shows that in the case of pitching up-stop movement the vortex breakdown position is dependent on the range of incidence at which the wing is subject to pitching up-stop and the reduced frequency k (k=α c/2U∞). Analysis of the pressure signal measured in the wind tunnel shows when the delta wing is subject to pitching-up the nondimensional spiral wave frequency at nominal incidence in post-breakdown is higher than that at corresponding static state and the bigger the k is, the higher the nondimensional spiral wave frequency is. The same conclusion is fitted with different sweep delta wing.
delta wing reduced frequency pitching up-stop vortex breakdown spiral wave
Zhang Minglu Yang Yiren Lu Zhiyong
School of Mechanics and Engineering, Southwest Jiaotong University, Chengdu 610031,China School of Aeronautic Science and Engineering, Beijing University of Aeronautics and Astronautics,Bei
国际会议
三亚
英文
350-353
2012-01-06（万方平台首次上网日期，不代表论文的发表时间）