Helicopter rotor aerodynamic interference control method based on propeller tip mass jet

Abstract

The invention provides a helicopter rotor aerodynamic interference control method based on propeller tip mass jet. The helicopter rotor aerodynamic interference control method includes the steps: configuration parameters and flight parameters of rotors and blades are read, and a solver based on a CFD technology and jet boundary conditions is established, wherein the solver is used for a rotor propeller tip vortex field high-precision simulation and jet control simulation; under the given flight state, vortex core characteristic parameters of propeller tip vortexes of the rotor blades at different azimuth angles are calculated on the premise that mass jet control is not applied; the position and direction of a mass jet orifice are selected at a rotor propeller tip, and the jet velocity andmode of air mass jet are given; based on the given jet scheme, under the given flight state, the vortex core characteristic parameters of the propeller tip vortexes of the rotor blades at the different azimuth angles are calculated again; the jet velocity and mode are changed, the vortex core characteristics of the rotor propeller tip vortexes at the different azimuth angles under different jet schemes are calculated, and an evolvement rule of the vortex core characteristics along with the jet schemes is obtained; and the evolvement characteristics of the propeller tip vortexes obtained aftercontrol is applied are compared with results before control is applied, and a control mode of the vortex core rotating velocity decreasing to the minimum is obtained.

Description

technical field [0001] The invention relates to a helicopter aerodynamic technology, in particular to a helicopter rotor aerodynamic disturbance control method based on blade tip mass jet. Background technique [0002] The rotor is one of the most important parts of the helicopter, which makes the helicopter have excellent characteristics such as vertical take-off and landing, hovering in the air, etc., but it also brings serious aerodynamic interference problems to the helicopter. During the rotation of the rotor blades, a strong and concentrated tip vortex will be generated. The tip vortex moves with the local airflow and interferes with the fuselage, tail rotor and vertical tail of the helicopter. In some specific flight states, the propeller The blade tip vortex that comes out of the blade will also approach or even collide with other blades, resulting in serious blade-vortex interference (Blade-Vortex Interaction, BVI) problems. Blade-vortex interference and aerodynamic...

AI Technical Summary

Problems solved by technology

Although with the rapid development of CFD technology, the high-precision numerical simulation of rotor blade tip vortex has basically been realized, but the mechanism and parameter influence of rotor blade tip vortex generation and evolution have not been well understood.

In terms of numerical research on rotor tip vortex mass jet control, according to the search results, foreign scholars have carried out computational research on rotor tip vortex control in hovering state by different jet modes. The generation, evolution and active control of the sharp vortex have not yet been carried out

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