A Parametric CFD Study for the Effect of Spanwise Parabolic Chord Distribution on the Thrust of an Untwisted Helicopter Rotor Blade

Elfarra, Munir; Kaya, Mustafa; Kadıoğlu, Ferhat

doi:10.2514/6.2018-1795

Cited by 5 publications

(2 citation statements)

References 15 publications

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“…The domain is finely meshed before the analysis to get an accurate result. The blades and the computational domain are meshed in a very finer way [25]. The meshing of the blade with domain is shown in Fig.…”

Section: Grid Generation and Solver Settingmentioning

confidence: 99%

Forward Flight Performance Analysis of Supercritical Airfoil in Helicopter Main Rotor

Hasan¹,

Mukesh²,

Krishnan³

et al. 2022

Intelligent Automation &Amp; Soft Computing

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In this research, the aerodynamic performance and flow characteristics of NASA SC (2)-0714 airfoil and HH02 airfoil in the helicopter main rotor are evidently analyzed. The supercritical airfoil is used in the aircraft for attaining better transonic and high-speed flow characteristics. Moreover, a specialized helicopter airfoil called HH02 is used in the Apache helicopter rotor for increasing the operational speed. As most of the high-speed helicopters are using four-bladed main rotor configuration, it is analyzed with prior attention. The lift and thrust act in different directions for the forward phase of the flight whereas the lift and thrust act in the same direction for the other phases of flight, which is analyzed in this work. The computational analysis is done by using ANSYS Fluent whereas the rotational analysis is done by using the Multiple Reference Frame (MRF) method. An analysis is carried out for different RPM of 400,600 and 800 with the combination of 0.3, 0.4 and 0.5 Mach numbers with the assistance of grid independence test. The result shows that the NASA SC (2)-0714 rotor increases the thrust of the rotor around 5% to 10% under various rotor and forward speeds. Thus, the results proves that the supercritical airfoil is highly capable of producing higher thrust and good aerodynamic characteristics.

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Section: Grid Generation and Solver Settingmentioning

confidence: 99%

Forward Flight Performance Analysis of Supercritical Airfoil in Helicopter Main Rotor

Hasan¹,

Mukesh²,

Krishnan³

et al. 2022

Intelligent Automation &Amp; Soft Computing

View full text Add to dashboard Cite

show abstract

“…There are many researches about the Caradonna-Tung helicopter rotor blade, some of which can be seen in references (Doerffer & Szulc, 2008;Elfarra, Kaya, & Kadioglu, 2018;Mohd & Barakos, 2012;Steijl, Barakos, & Badcock, 2006).…”

Section: Introductionmentioning

confidence: 99%

Optimization of helicopter rotor blade performance by spline-based taper distribution using neural networks based on CFD solutions

Elfarra

2019

Engineering Applications of Computational Fluid Mechanics

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The taper distribution along the span of a helicopter blade is defined using a novel method applied for the first time and considered as the main contribution of this work. This method uses cubic splines to generate modified blade shapes. The thrust and the torque values, computed by a 3-D Reynolds Average Navier Stokes solver, are used to train a Neural Networks based model. After that a constrained optimization is conducted based on this model for two different rotor speeds under hover condition. The optimization variables are the chord lengths at three different span locations: root, mid-span and tip. The optimization constraints are the torque or thrust values of the original blade and the practical limits for the chord lengths. Two optimum cases are investigated: maximum Figure of Merit with greater thrust and maximum Figure of Merit with less torque than the baseline. The major challenge of this work is to use the taper distribution as the only design parameter to obtain comparable results to other studies in literature in which more than one parameter is used. The results show that the Figure of Merit can improve by around 5% and the torque can be reduced by around 20%.

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Blade planform improvement and airfoil shape optimization of helicopters in hover flight

Shahmiri

Badihi

2020

J Braz. Soc. Mech. Sci. Eng.

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A Parametric CFD Study for the Effect of Spanwise Parabolic Chord Distribution on the Thrust of an Untwisted Helicopter Rotor Blade

Cited by 5 publications

References 15 publications

Forward Flight Performance Analysis of Supercritical Airfoil in Helicopter Main Rotor

Forward Flight Performance Analysis of Supercritical Airfoil in Helicopter Main Rotor

Optimization of helicopter rotor blade performance by spline-based taper distribution using neural networks based on CFD solutions

Blade planform improvement and airfoil shape optimization of helicopters in hover flight

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