Numerical Simulation of Isolated Main Rotor and Full Helicopter Configuration in Vertical Autorotative Descent

Zineb Elkhaldi; Lahouari Adjlout; Omar Imine; Ondrej Sikula

doi:10.15866/ireme.v14i6.18271

Numerical Simulation of Isolated Main Rotor and Full Helicopter Configuration in Vertical Autorotative Descent

Zineb Elkhaldi^(1*), Lahouari Adjlout⁽²⁾, Omar Imine⁽³⁾, Ondrej Sikula⁽⁴⁾

^(*) Corresponding author

Authors' affiliations

DOI: https://doi.org/10.15866/ireme.v14i6.18271

Abstract

This paper presents and discusses the results of the transient numerical simulation carried out for an isolated main rotor model and a helicopter in vertical descent autorotation by developing the 6-degree of freedom, rigid-body equations of helicopter motion. The Unsteady Reynolds Averaged Navier-Stokes model is used to simulate the unsteady flow field surrounding four-bladed BO-105 isolated main rotor and complete helicopter which includes the fuselage and the tail rotor. The principal autorotation characteristics for the helicopter such as induced velocity, rate of descent, main rotor angular speed, thrust and torque have been calculated. The simulation results show the creation of a spanwise flow on the upper surface of the blade, and moving fluid in the direction of the blade tip in a region downstream and beneath the leading edge vortex. The aerodynamic characteristics on the complete helicopter are similar to the ones attained for the isolated rotor simulation.
Copyright © 2020 Praise Worthy Prize - All rights reserved.

Keywords

Helicopter Autorotation; Axial Autorotation; Computational Fluid Dynamics; Reynolds Average Navier Stokes (RANS); Rigid Body Dynamics (RBD); Six Degrees of Freedom

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