Aerodynamic interference effects on aerostatic coefficients of typical sections in tandem arrangement

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Journal of Vibration and Shock ›› 2015, Vol. 34 ›› Issue (5) : 6-13.

Aerodynamic interference effects on aerostatic coefficients and Strouhal numbers of two sections in tandem, namely, two rectangular sections in tandem, two Π-type sections in tandem and two streamlined sections in tandem, were investigated using numerical methods and wind tunnel tests. To validate the accuracy of the numerical methods, the numerical simulation of flow passing a fixed rectangular section with a width-to-depth ratio of 5 was carried out, and the numerical results agree well with the experimental results. Totally, two rectangular sections in tandem, two Π-shaped sections in tandem and two streamlined sections in tandem with a varying separation ratio of D/B(D is the net distance between two sections in tandem, B is the width of the single section) were simulated separately with numerical methods. The results show that the drag coefficients of windward section is close to that of the single section, the drag coefficients of leeward section increase with the increasing of D/B. The RMS of lift and pitching moment coefficients of windward are significantly less than that of the leeward section, and they first increase and then decrease with the increasing of D/B.

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Abstract

Aerodynamic interference effects on aerostatic coefficients and Strouhal numbers of two sections in tandem, namely, two rectangular sections in tandem, two Π-type sections in tandem and two streamlined sections in tandem, were investigated using numerical methods and wind tunnel tests. To validate the accuracy of the numerical methods, the numerical simulation of flow passing a fixed rectangular section with a width-to-depth ratio of 5 was carried out, and the numerical results agree well with the experimental results. Totally, two rectangular sections in tandem, two Π-shaped sections in tandem and two streamlined sections in tandem with a varying separation ratio of D/B(D is the net distance between two sections in tandem, B is the width of the single section) were simulated separately with numerical methods. The results show that the drag coefficients of windward section is close to that of the single section, the drag coefficients of leeward section increase with the increasing of D/B. The RMS of lift and pitching moment coefficients of windward are significantly less than that of the leeward section, and they first increase and then decrease with the increasing of D/B.

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two sections in tandem arrangement / aerostatic coefficients / aerodynamic interference effects / numerical simulations / wind tunnel experiments

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Liu Zhiwen, Chen Zhengqing. Aerodynamic interference effects on aerostatic coefficients of typical sections in tandem arrangement[J]. Journal of Vibration and Shock, 2015, 34(5): 6-13

References

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