Correlative Analysis between Pressure Distributions and VortexPattern of DoubleDelta Wings at High Angles of Attack
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摘要: 将双三角翼翼面测压试验结果与空间涡态观察测量结果进行了定性的相关对比分析,分析表明:垂直于双三角翼翼面的典型横截面上展向压强系数Cp分布与空间涡态有明显的对应关系,Cp分布的峰值数目反映了双三角翼的双涡态和单涡态,Cp峰值随α变化反映了涡强随α的变化,Cp峰值所在展向位置反映着涡核的展向位置,Cp峰形的平坦反映了涡的破裂.Abstract: The pressure distributions on two models of doubledelta wing were measured in the low speed wind tunnel in BUAA.They are 75°/45° and 75°/60° doubledelta wings with sharp or round outboard leadingedge.The analysis indicates that two peaks of the pressure distributions on some typical cross sections of the doubledelta wing characterize the double vortices while the one peak of those characterize the single or merged vortex patterns.The position of the vortex core can be marked by the location of the spanwise pressure peak.The vortex breakdown can be displayed by the decrease of the pressure peak and flat pressure distribution with increasing angle of attack.The outboard leadingedge of the doubledelta wing being blunted causes inboard and outboard vortices close each other and stronger interaction.The pressure distributions and vortex breakdown positions will be unsymmetric about the centreline of the wing due to a side slip.All of the unsymmetric vortex flow characteristics that can be found on the correlative pressure distributions.
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Key words:
- separated flow /
- double delta wings /
- vortex flow /
- high angle of attack
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1.Kulfan R M.Wing geomety on leading edge vortices.AIAA Paper 1979,791872 2. 冯亚南,刘日之,邢玉山.双三角翼外翼前缘钝度对气动特性的影响.北京航空航天大学学报,1993,(1):57~62 3. 冯亚南,吴 成,熊善文,等.75°/45°双三角翼外翼前缘形状对大迎角分离流特性影响.空气动力学学报,1994,12(3):301~306 4. 冯亚南,吴 成,熊善文.两种典型双三角翼外翼前缘钝化对涡流特性的影响.北京航空航天大学学报,1997,23(3):341~345 -
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