High-lift-to-drag ratio balance applied to low-speed wind tunnel

Abstract

The invention provides a high-lift-to-drag ratio balance applied to a low-speed wind tunnel. The high-lift-to-drag ratio balance comprises a test model connecting cone, combined force measuring elements, a balance base body, resistance measuring elements, support sheets and a support rod connecting cone, wherein two ends of the balance base body are connected with the model connecting base and the support rod connecting cone through the combined force measuring elements; the balance base body is divided into an upper part and a lower part by an inclined groove which penetrates through the design center of the balance and runs through back and forth; the upper part and the lower part of the balance base body are connected into a whole through front, rear, left and right four groups of support sheets which are symmetrical about the design center of the balance; grooves are formed in the front part and the rear part of the balance base body symmetrically about the design center of the balance; the resistance measuring elements are arranged in the two grooves; and the resistance measuring elements are n-shaped beams (described in the specification); two ends of each n-shaped beam are connected with the balance base body through flexible hinges; and every two adjacent n-shaped beams are arranged anti-symmetrically about a longitudinal symmetric shaft in an up-front and down-back manner. The high-lift-to-drag ratio balance is high in high-lift-to-drag ratio balance, strong in antijamming capability and good in torsion resisting stiffness.

Description

technical field [0001] The invention relates to a balance with a high lift-drag ratio applied in a low-speed wind tunnel, in particular to a six-component force-measuring balance in a low-speed wind tunnel, which is mainly used in conventional wind tunnel tests of aircraft with a large aspect ratio. Background technique [0002] In conventional dynamometric tests in low-speed wind tunnels, the lift-to-drag ratio of the dynamometer balance is generally relatively small because the aspect ratio of the aircraft is not large. In recent years, with the rapid development of UAV technology, high-altitude and long-endurance UAVs have played an important role in the military field. If high-altitude and long-endurance UAVs want to fly high, fast, and long-lasting, their aerodynamic shape and layout generally adopt unconventional designs such as wings with a large aspect ratio, so that the lift-to-drag ratio of the whole aircraft reaches more than 30. In order to adapt to the research...

AI Technical Summary

Problems solved by technology

Due to the limitation of experimental equipment and other reasons, the experimental technology of large aspect ratio aircraft in my country started relatively late, and there are still many deficiencies in the design of high-lift-drag ratio high-precision force-measuring balances

[0003] At present, the FD-09 wind tunnel large-aspect-ratio drone is still using traditional force-measuring balances for force-measuring tests, which are difficult to meet the requirements of high lift-to-drag ratio

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