Helicopter rotor aerodynamic disturbance control method based on tip mass jet

Abstract

The invention provides a helicopter rotor aerodynamic interference control method based on the tip mass jet, comprising: reading the configuration parameters and flight parameters of the rotor and blades, and establishing the vortex field height of the rotor tip based on CFD technology and jet boundary conditions The solver for precision simulation and jet control simulation; in a given flight state, calculate the vortex core characteristic parameters of the tip vortex of the rotor blade at different azimuth angles without applying mass jet control; The position and direction of the jet port with a given mass, the jet velocity and the jet mode of the jet with a given air quality; based on the given jet scheme, the vortex of the tip vortex of the rotor blade at different azimuth angles is analyzed again in a given flight state Calculate the core characteristic parameters; transform the jet velocity and mode, calculate the vortex core characteristics of the rotor blade tip vortex at different azimuth angles under different jet flow schemes, and obtain its evolution law with the jet flow scheme; the evolution characteristics of the blade tip vortex obtained after applying the control Compared with the results before the control is applied, the control mode in which the rotation speed of the vortex core is reduced to the lowest 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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