A New Coupled Free Wake-CFD Method for Calculation of Helicopter Rotor Flow-Field in Hover
ABSTRACT: This paper concerns a new coupled free wake-CFD method for proper calculation of aerodynamic loads on a two bladed helicopter rotor in hovering flight. Loading is computed by solving the three dimensional Euler equations in a rotating coordinate system. However, since direct simulation of the tip vortices and wake requires a very fine grid, the rotor's wake effects are modeled by a free wake approach and included into the CFD calculation by a transpiration boundary condition at the rotor surface. An influence coefficient solution method is used to find the rotor's wake shape, being steady in a rotating frame. Euler equations are also considered in the form of absolute flow variables and solved by a multi grid Jameson's finite-volume method. The accuracy of the proposed method is illustrated by comparing numerical results to the available experimental results for the pressure distribution on a blade of a model helicopter rotor at different tip Mach numbers.
Main Authors: | Farrokhfal,Hamid, Pishevar,Ahmad Reza |
---|---|
Format: | Digital revista |
Language: | English |
Published: |
Departamento de Ciência e Tecnologia Aeroespacial
2014
|
Online Access: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2175-91462014000200129 |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Similar Items
-
Optimization of Airfoils for Minimum Pitching Moment and Compressibility Drag Coefficients
by: Farrokhfal,Hamid, et al.
Published: (2014) -
Anti-swing Controller Based on Time-delayed Feedback for Helicopter Slung Load System near Hover
by: Omar,Hanafy Mohammad
Published: (2012) -
Comparative Study of Coaxial Main Rotor Aerodynamics in the Hover with the Usage of Two Methods of Computational Fluid Dynamics
by: Konstantinov,Sergey Gennadievich, et al.
Published: (2021) -
Performance and Wake Analysis of Rotors in Axial Flight Using Computational Fluid Dynamics
by: Mohd,Nik Ahmad Ridhwan Nik, et al.
Published: (2017) -
A Numerical Study of a Rotor Induced Flow Based on a Finite-State Dynamic Wake Model
by: FERREIRA,L. G. A., et al.
Published: (2021)