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research-article

Numerical Modelling of Stall and Post Stall Events of a Single Pitching Blade of a Cycloidal Rotor

[+] Author and Article Information
Kuldeep Singh

Department of Electromechanical Engineering, University of Beira Interior, R. Marquês D’Avila e Bolama, 6201-001 Covilhã, Portugal
k.singh@ubi.pt

José Páscoa

Professor, Department of Electromechanical Engineering, University of Beira Interior, R. Marquês D’Avila e Bolama, 6201-001 Covilhã, Portugal
pascoa@ubi.pt

1Corresponding author.

ASME doi:10.1115/1.4040302 History: Received January 26, 2018; Revised May 10, 2018

Abstract

In the present work, a numerical study is carried out to compare the performance of seven turbulence models on a single pitching blade of cycloidal rotor operating in deep dynamic stall regime at moderate Reynolds number. The investigated turbulence models were: (i) k?-SST (ii) k?-SST with ? (iii) Transition SST (?-Re?) (iv) Scale Adaptive Simulation (SAS) (v) SAS coupled with Transition SST (vi) SAS with ? (vii) Detached Eddy Simulation (DES) coupled with Transition k?-SST. The wake vortices evolution and shedding analysis is also carried out for the pitching blade. The performance of the investigated turbulence models is evaluated at various critical points on the hysterias loop of lift and drag coefficients. The predictions of the investigated turbulence models are in good agreement at lower angle of attack i.e. ?u ? 20°. The detailed quantitative analysis at critical points showed that the predictions of SAS and Transition SST-SAS turbulence models are in better agreement with the experimental results as compared to the other investigated models. The wake vortices analysis and FFT analysis showed that the wake vortex characteristics of a pitching blade is significantly different than that for the low amplitude oscillating blade at the higher reduced frequency.

Copyright (c) 2018 by ASME
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