Design and optimization method for low-Reynolds-number flow large-lift rotor wing

Abstract

The invention relates to a low Reynolds number flow large lift rotor design and optimization method. The invention relates to the technical field of low Reynolds number flow large lift rotor design, and the method comprises the following steps: selecting a two-dimensional airfoil based on a profili airfoil database; determining a torsion angle and a chord length based on the selected two-dimensional airfoil profile; according to the determined torsion angle and chord length, the blade flow Reynolds number is determined, and a span chord is selected; establishing a simulation model, selecting a proper turbulence model equation, and linking a pulsation item and a time-average item to solve the equation; a five-point method is adopted, and the number of grids is continuously increased for grid verification; and the model is corrected, and the design of the low-Reynolds-number flow large-lift rotor wing is completed. The nonlinear torsion design has the best performance in the aspect of lift force improvement, and the lift force and the lift force per unit volume are the highest in all models.

Description

technical field [0001] The invention relates to the technical field of low Reynolds number flow high lift rotor design, and relates to a low Reynolds number flow high lift rotor design and an optimization method. Background technique [0002] Various deep space exploration projects mainly based on Mars helicopters have low flow Reynolds number due to the low pressure and low density of the working environment of the aircraft. It is difficult for conventional rotor designs to obtain sufficient lift for flight in such a thin environment, so the low Reynolds number is improved. The lower rotor lift becomes the focus of the design. [0003] Existing research results mostly focus on the correction of low pressure and low density performance of traditional rotors, while ignoring the special atmospheric environment of Mars, that is, changes in flow sound speed caused by changes in gas composition and day and night temperature, which will affect the two-dimensional wing. At the sam...

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Problems solved by technology

[0003] Existing research results mostly focus on the low pressure and low density performance correction of traditional rotors, ignoring the special atmospheric environment of Mars, that is, the change of flow sound velocity caused by gas composition and diurnal temperature changes, which will affect the two-dimensional wing. The reselection of the type and the determination of the limitation of the motor speed; at the same time, due to the small drag torque brought by the low Reynolds number flow, the negative torsion used by the conventional rotor is not suitable for use due to poor lift performance.

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