Methods for improving pitching moment characteristics of a propeller airplane

CHEN Bo; MIAO Tao; MA Shuai; GENG Jianzhong; JIANG Xiong

doi:10.7527/S1000-6893.2018.22341

ACTA AERONAUTICAET ASTRONAUTICA SINICA >

2019 , Vol. 40 >Issue 4: 622341 - 622341

DOI: https://doi.org/10.7527/S1000-6893.2018.22341

Special Column on Key Technology in Aerodynamic Strength and Landing Safety of Carrier-based Aircraft

Methods for improving pitching moment characteristics of a propeller airplane

CHEN Bo ,
MIAO Tao ,
MA Shuai ,
GENG Jianzhong ,
JIANG Xiong

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1. Computational Aerodynamics Institute, China Aerodynamic Research and Development Center, Mianyang 621000, China;
2. AVIC The First Aircraft Design Institute, Xi'an 710089, China

Received date: 2018-05-18

Revised date: 2018-06-11

Online published: 2018-08-30

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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

Cite this article

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 . DOI: 10.7527/S1000-6893.2018.22341

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