High-reliability method for rapidly forecasting rolling dynamic derivative of aircraft

Abstract

The invention discloses a high-reliability method for rapidly forecasting a rolling dynamic derivative of an aircraft. The high-reliability method includes the steps of generation of model surface grids and division of spatial grids, calculation of aerodynamic parameters under a rotating coordination system, and difference calculation of the rolling dynamic derivative. A calculation method for the aerodynamic parameters under the rotating coordination system includes (1), transforming a Navier-Stokes equation under an inertial system to the rotating coordinate system; (2), performing numerical solution on the transformed equation to acquire a flow field of each state; (3), acquiring aerodynamic force through surface integration of object-plane pressure and viscous stress, taking moment from the center of mass through surface force and integrating to acquire aerodynamic moment acting on the center of mass. The difference calculation includes calculating the aerodynamic force and the aerodynamic moment of a model at two different revolving speeds, and acquiring the rolling dynamic derivative of the model by a difference method. The method is high in reliability of calculation results, has a much smaller calculated amount as compared with a non-steady forced vibration method which is time-consuming for accurate solution, and can quickly forecast the rolling dynamic derivative of the aircraft in a highly reliable manner.

Description

technical field [0001] The invention relates to the field of fluid mechanics, in particular to a method for rapidly predicting the rolling derivative of an aircraft with high reliability. Background technique [0002] The dynamic derivative is the change of aerodynamic force or moment caused by the change of unit velocity or angular velocity in the motion of the aircraft, expressed in the form of derivative. The rolling derivative of the aircraft is an indispensable original aerodynamic parameter for the design of the aircraft navigation system and control system and the analysis of the dynamic quality. The accurate evaluation of the rolling derivative is of great significance to the design and flight of the aircraft. With the expansion of the flight envelopes of advanced fighter jets and missiles, and the maneuvering flight under high angle of attack and sideslip conditions, people pay more attention to the research of aircraft dynamic stability in complex flow fields. In ...

AI Technical Summary

Problems solved by technology

This numerical method based on CFD technology can take into account the nonlinear characteristics of the flow field, and is applicable to conditions such as a larger range of angle of attack, and can be used to carry out aerodynamic calculations of complex shapes. Large, when the simulated shape is complex, the demand for computing resources is even greater, which cannot meet the requirements of model design

Images