Numerical simulation method of aerodynamic interactions of helicopter rotor/tail-rotor

Abstract

The invention discloses a numerical simulation method of aerodynamic interactions of a helicopter rotor/tail-rotor. A precise numerical simulation model of rotor/tail-rotor aerodynamic interactions is established according to related parameters of a helicopter; rotor/tail-rotor interactive flow fields are subjected to CFD (computational fluid dynamics) computing in various states through the model; the computing results are subjected to contrastive analysis. The results of the numerical simulation model of rotor/tail-rotor aerodynamic interactions are closer to actual results; with interactive flow field results acquired by entering different rotor/tail-rotor parameters into a computing input file for computing, interaction conditions of the helicopter rotor/tail-rotor can be simulated; the errors caused by computing of the rotor/tail-rotor aerodynamic interactions in the traditional vortex system method are avoided; the method is directly applicable to the design of the helicopter, computing of flight performance and analysis of flight quality.

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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