A Numerical Simulation Method of Helicopter Rotor/Tail Rotor Aerodynamic Disturbance

Abstract

The helicopter rotor / tail rotor aerodynamic interference numerical simulation method disclosed by the present invention establishes an accurate numerical simulation model of rotor / tail rotor aerodynamic interference according to the relevant parameters of the helicopter, and the rotor / tail rotor is controlled by the numerical simulation model in various states. The CFD calculation of the propeller disturbance flow field is carried out, and the calculation results are compared and analyzed. The numerical simulation model of rotor / tail rotor aerodynamic disturbance established by the numerical simulation method of the present invention is closer to the actual disturbance result in result. Input different rotor / tail rotor parameters into the calculation input file and perform calculations to obtain the interference flow field results, which can simulate the interference of helicopter rotor / tail rotor in different flight states, and avoid the traditional vortex system method The error caused by the calculation of rotor / tail rotor aerodynamic interference can directly serve the helicopter design, flight performance calculation and flight quality analysis.

Description

technical field [0001] The invention relates to the technical field of helicopters, in particular to a numerical simulation method for helicopter rotor / tail rotor aerodynamic interference. Background technique [0002] The aerodynamic interference between the parts of the helicopter is very complicated, which is directly related to the performance and flight quality of the helicopter. In the past, a lot of work has been done on the isolated rotor or tail rotor of helicopters, however, there are relatively few studies on unsteady rotor / tail rotor disturbances considering the real situation. In 1977, Leverton et al. conducted flight measurements on the Lynx helicopter to determine the cause of the "burble" noise produced when the helicopter flew forward. In the original design of the Lynx helicopter, the direction of rotation of the tail rotor was "bottom-to-back". When changing the direction of rotation of the tail rotor to "bottom-to-forward", the problem of "burble" noise ...

AI Technical Summary

Problems solved by technology

Different flight states and rotor / tail rotor parameters will lead to different meeting positions between the rotor wake and the tail rotor, which will lead to different characteristics of the tail rotor affected by disturbance

If the test method is used to study the characteristics of the rotor and tail rotor being disturbed, one is that the cost is too high, and the other is that it cannot simulate various actual flight situations, such as particularly dangerous situations

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