螺旋桨飞机俯仰力矩特性改进方法

doi:10.7527/S1000-6893.2018.22341

Abstract

Abstract: The aerodynamic disturbance caused by propeller slipstream on various parts of a propeller airplane results in the deterioration of pitching moment characteristics of a propeller airplane, and endangers flight safety. It is very important to study the influence mechanism of propeller slipstream on pitching moment characteristics and methods for improving pitching moment characteristics with propeller slipsteam for a propeller airplane. Numerical simulation of the flow field around a propeller airplane with different pull coefficients is carried out by using multi-block structured grids which are dynamically overlapped. The governing equation is unsteady Reynolds average compressible Navier-Stokes equations. The results show that the aerodynamic interference of propeller slipstream on wings and flat tails is the main reason of the deterioration of pitching moment characteristics of a propeller airplane. The key to improve pitching moment characteristics of a propeller airplane is to improve lift characteristics of its flat tails. Using the falling configuration when its thrust coefficient is 0.4 as the optimization object, methods for improving pitching moment characteristics of a propeller airplane are studied, in terms of lowering the height of flat tails, changing the dihedral angle of flat tails, and raising the axis of propellers. It is found that pitching moment characteristics of a propeller airplane can be significantly improved by reducing the vertical distance between the flat tails and the axis of propellers without increasing the overall downwash strength of the wings.

Key words: pitching moment characteristics, dynamically overlapped grids, propeller slipstream, downwash, flat tails

CLC Number:

V211.3

CHEN Bo, MIAO Tao, MA Shuai, GENG Jianzhong, JIANG Xiong. Methods for improving pitching moment characteristics of a propeller airplane[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2019, 40(4): 622341-622341.

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Methods for improving pitching moment characteristics of a propeller airplane

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