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Rapid computation of rotary derivatives for subsonic and low transonic flows

Jian-Ming Fu (Shanghai Electro-Mechanical Engineering Institute, Shanghai, China)
Hai-Min Tang (Shanghai Electro-Mechanical Engineering Institute, Shanghai, China)
Hong-Quan Chen (College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, China)

Engineering Computations

ISSN: 0264-4401

Article publication date: 7 August 2019

Issue publication date: 19 November 2019

Abstract

Purpose

The purpose of this paper is to develop a new approach for rapid computation of subsonic and low-transonic rotary derivatives with the available steady solutions obtained by Euler computational fluid dynamics (CFD) codes.

Design/methodology/approach

The approach is achieved by the perturbation on the steady-state pressure of Euler CFD codes. The resulting perturbation relation is established at a reference Mach number between rotary derivatives and normal velocity on surface due to angular velocity. The solution of the reference Mach number is generated technically by Prandtl–Glauert compressibility correction based on any Mach number of interest under the assumption of simple strip theory. Rotary derivatives of any Mach number of interest are then inversely predicted by the Prandtl–Glauert rule based on the reference Mach number aforementioned.

Findings

The resulting method has been verified for three typical different cases of the Basic Finner Reference Projectile, the Standard Dynamics Model Aircraft and the Orion Crew Module. In comparison with the original perturbation method, the performance at subsonic and low-transonic Mach numbers has significantly improved with satisfactory accuracy for most design efforts.

Originality/value

The approach presented is verified to be an efficient way for computation of subsonic and low-transonic rotary derivatives, which are performed almost at the same time as an accounting solution of steady Euler equations.

Keywords

Citation

Fu, J.-M., Tang, H.-M. and Chen, H.-Q. (2019), "Rapid computation of rotary derivatives for subsonic and low transonic flows", Engineering Computations, Vol. 36 No. 9, pp. 3108-3121. https://doi.org/10.1108/EC-09-2018-0399

Publisher

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Emerald Publishing Limited

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