Efficient Numerical Techniques for Simulating a Rotorcraft Flow Field with Overlapping Grids

Yang, Xiaoquan; Yang, An-Shik; Si, Jiangtao

doi:10.2514/1.j053426

Cited by 6 publications

(3 citation statements)

References 31 publications

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“…As this study is focused on the basic flow characteristic of such a device, implementing a simple structure for the open fan was more suitable to this study’s purpose. Hence, the Caradonna and Tung’s rotor 18,19 was selected as the open fan model. Because it is a classic case used in the rotor community for validation of the CFD method, this open fan consists of two rectangular, untwisted, and untampered NACA0012 rigid blades.…”

Section: Ducted Fan With Tip-jet Systemmentioning

confidence: 99%

Effects of tip-jet on the performance of a ducted fan

Huang

Chen

2019

Proceedings of the Institution of Mechanical Engineers, Part G:

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Tip-jet technology has potential value for application in vertical take-off and landing or short take-off and landing concept aircraft. The main objective of this current work is to investigate the effects of the tip-jet on the performance of a ducted fan in hover. The overall flow field of the ducted fans with tip-jet was simulated by using the shear-stress transport k-omega turbulence model with a refined high-quality structured grid at various rotational speeds. The comparative analysis of the performances of the ducted fans with different tip-jet locations was carried out. The results indicate that the circulation of the blade with tip-jet is affected by the flow blockage, Coanda effect, and edge-shed vortex. These flow features were formed by the tip-jet. The fan’s thrust could be augmented when the nozzle was a little farther from the blade trailing edge. However, a higher jet flow utility efficiency could be achieved when the nozzle was close to the blade trailing edge.

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Section: Ducted Fan With Tip-jet Systemmentioning

confidence: 99%

Effects of tip-jet on the performance of a ducted fan

Huang

Chen

2019

Proceedings of the Institution of Mechanical Engineers, Part G:

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“…The governing equations are defined in the ground coordinate system, and the absolute physical quantities are used as the parameters. The Navier-Stokes (N-S) equation in conservation integral form is established as follows 14,15 ∂ ∂t…”

Section: Air Flow Field Calculationmentioning

confidence: 99%

“…The calculation results are in good agreement with the experimental results 27 and the calculation results. 15 The phenomenon of shock wave is indicated by the obvious pressure step in the middle of curve at the azimuth angle of 90°. It can be seen that the unsteady method used in this article can effectively simulate the flow characteristics of rotor in forward flight.…”

Section: Flow Field Verificationmentioning

confidence: 99%

Numerical simulation for three-dimensional rotor icing in forward flight

Wang

Zhao

Zhu

2018

Advances in Mechanical Engineering

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Icing will occur when helicopters pass through clouds containing supercooled droplets. The ice accreted on rotor blade affects the safety of helicopter. A numerical simulation method of helicopter rotor icing in forward flight is presented, and the icing characteristics of rotor are studied. The flow field is calculated based on the overlapping grids, and the Eulerian model is applied in the droplet trajectory calculation. The unsteady method is used to calculate rotor flow field and droplet trajectory. The icing model considering the effect of centrifugal force is adopted to simulate the ice shapes of rotor in forward flight. The average ice growth rate is compared with the ice growth rate at each azimuth angle, and the effects of blade pitch and forward flight speed on the droplet impingement and icing characteristics are summarized. Finally, the influence of time step on the calculation results is analyzed. The calculation results show that the droplet impingement characteristics and icing characteristics change continuously in forward flight. The ice growth rate and droplet collection efficiency are larger on the advancing blade and smaller on the retreating blade.

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Aerodynamics and vibration analysis of a helicopter rotor blade

Pulok,

Chakravarty

2024

Acta Mech

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Efficient Numerical Techniques for Simulating a Rotorcraft Flow Field with Overlapping Grids

Cited by 6 publications

References 31 publications

Effects of tip-jet on the performance of a ducted fan

Effects of tip-jet on the performance of a ducted fan

Numerical simulation for three-dimensional rotor icing in forward flight

Aerodynamics and vibration analysis of a helicopter rotor blade

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