文章摘要
张昊哲,段富海.Z形折叠翼厚度对其气动特性影响分析[J].,2024,64(1):40-47
Z形折叠翼厚度对其气动特性影响分析
Influence analysis of airfoil thickness on aerodynamic characteristics of Z-shaped folding wing
  
DOI:10.7511/dllgxb202401005
中文关键词: Z形折叠翼  CFD法  升力面法  气动力
英文关键词: Z-shaped folding wing  CFD method  lift surface method  aerodynamic force
基金项目:国家自然科学基金资助项目(51975082).
作者单位
张昊哲,段富海  
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中文摘要:
      Z形折叠翼飞行器可在飞行过程中改变机翼面积,改善气动特性,执行多种任务.然而机翼折叠过程中有效气动面积、重心、气动焦点等参数的变化,会对飞行器气动特性产生较大影响.此外,机翼表面相互靠近,由机翼厚度引发的气动干扰也会导致升力、折叠铰链力矩等气动力发生变化.为此,首先利用薄翼理论和升力面法推导理想气体来流条件下折叠翼的定常气动力表达式.然后,采用CFD法分析折叠过程中折叠角、攻角和机翼厚度对飞行器升力、折叠铰链力矩等气动特性的影响,并将分析结果与升力面法结果对比.结果表明机翼折叠过程中,有效气动面积减小,升力、阻力系数总体呈下降趋势;随着折叠角增大,机翼表面相互靠近产生的低压区强度增加,机翼厚度对折叠翼气动特性影响显著增强.另外相比于CFD法,忽略机翼厚度项的升力面法对于折叠翼的气动力计算会产生较大误差.
英文摘要:
      Z-shaped folding wing aircraft can change the wing area, improve the aerodynamic characteristics and perform a variety of tasks during flight. However, the changes of effective aerodynamic area, center of gravity, aerodynamic focus and other parameters will have a great impact on the aerodynamic characteristics of the aircraft during the wing folding process. In addition, when the wing surfaces are close to each other, the aerodynamic interference caused by the airfoil thickness will also lead to changes in the aerodynamic forces such as lift and folding hinge moment. For this reason, the steady aerodynamic expression of folding wing under the condition of ideal gas flow is derived by using thin wing theory and lift surface method. Then, the effects of folding angle, attack angle and airfoil thickness on the aerodynamic characteristics of the aircraft such as lift and folding hinge moment are analyzed by CFD method, and the analysis results are compared with those of the lift surface method. The results show that in the process of wing folding, the effective aerodynamic area decreases, and the lift and drag coefficients generally show a downward trend. With the increase of folding angle, the strength of the low-pressure region, generated by the wing surfaces approaching each other, increases, and the influence of airfoil thickness on the aerodynamic characteristics of the folding wing increases significantly. Compared with the CFD method, the lift surface method, which neglects the airfoil thickness term, has a larger error in the aerodynamic calculation of folding wings.
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