Effect of Lift-Share Ratio on Aerodynamic Performance of Winged Compound Helicopter

2021 ◽  
pp. 1-13
Author(s):  
Hideaki Sugawara ◽  
Yasutada Tanabe ◽  
Masaharu Kameda
Keyword(s):  
Aerodynamic Performance ◽  
Compound Helicopter

Aerodynamic Interactions on Airbus Helicopters' Compound Helicopter RACER in Cruise Flight

2020 ◽  
Vol 65 (4) ◽  
pp. 1-14
Author(s):  
Felix Frey ◽  
Jakob Thiemeier ◽  
Constantin Öhrle ◽  
Manuel Keßler ◽  
Ewald Krämer
Keyword(s):  
Mutual Influence ◽  
Aerodynamic Characteristics ◽  
Individual Performance ◽  
Aerodynamic Performance ◽  
High Fidelity ◽  
Main Rotor ◽  
Compound Helicopter ◽  
Cost Efficient ◽  
Cruise Flight

With the pursuit of extending the flight envelopes of helicopters toward higher cruise speed, helicopter manufacturers increasingly have come up with nonconventional configurations in recent years. Among these, Airbus Helicopters' RACER (Rapid And Cost-Efficient Rotorcraft) is a compound helicopter equipped with a boxwing and lateral pusher rotors. In combination with the main rotor, these additional components determine the aerodynamic characteristics of the helicopter. Thereby, depending on the flight conditions, their individual performance is influenced by a variety of interactions. As the understanding of these interactions is vital for the evaluation of the overall system, the respective mutual influence of main rotor, wings, and lateral rotors is analyzed in this paper for cruise flight. For this reason, high-fidelity coupled aerodynamic simulations are conducted not only for the full RACER configuration but also for reduced setups omitting individual components to isolate the effect of these components on the helicopter's aerodynamic performance.

Aerodynamic Interactions on Airbus Helicopters' Compound Helicopter RACER in Hover

2021 ◽  
Author(s):  
Felix Frey ◽  
Jakob Thiemeier ◽  
Constantin Öhrle ◽  
Manuel Keβler ◽  
Ewald Krämer
Keyword(s):  
Mutual Influence ◽  
Aerodynamic Performance ◽  
Second Order ◽  
High Fidelity ◽  
Main Rotor ◽  
Compound Helicopter ◽  
Cost Efficient

In recent years, helicopter manufacturers have developed an increasing number of nonconventional configurations in order to extend flight envelopes of helicopters towards higher cruise speed. Airbus Helicopters' approach is the compound helicopter RACER, which is equipped with a boxwing and lateral pusher rotors. As the combination of these components with the main rotor induces a variety of mutual interactions, influencing their individual aerodynamic performance depending on the flight conditions, the understanding of these interactions is vital for the evaluation of the overall system. For this reason, the respective mutual influence of main rotor, wings, and lateral rotors is analyzed in this paper for hover. With the help of high-fidelity coupled aerodynamic simulations for the full RACER (Rapid And Cost-Efficient Rotorcraft) configuration as well as for setups omitting individual components, first- and second-order interactions of these components are isolated and analyzed for their effect on the helicopter's aerodynamic performance.

Effects of stator splitter blades on aerodynamic performance of a single-stage transonic axial compressor

2020 ◽  
Vol 14 (4) ◽  
pp. 7369-7378
Author(s):  
Ky-Quang Pham ◽  
Xuan-Truong Le ◽  
Cong-Truong Dinh
Keyword(s):  
Stokes Equations ◽  
Three Dimensional ◽  
Axial Compressor ◽  
Aerodynamic Performance ◽  
Numerical Results ◽  
Single Stage ◽  
Navier Stokes ◽  
Navier Stokes Equations ◽  
Operating Stability ◽  
Length Coverage

Splitter blades located between stator blades in a single-stage axial compressor were proposed and investigated in this work to find their effects on aerodynamic performance and operating stability. Aerodynamic performance of the compressor was evaluated using three-dimensional Reynolds-averaged Navier-Stokes equations using the k-e turbulence model with a scalable wall function. The numerical results for the typical performance parameters without stator splitter blades were validated in comparison with experimental data. The numerical results of a parametric study using four geometric parameters (chord length, coverage angle, height and position) of the stator splitter blades showed that the operational stability of the single-stage axial compressor enhances remarkably using the stator splitter blades. The splitters were effective in suppressing flow separation in the stator domain of the compressor at near-stall condition which affects considerably the aerodynamic performance of the compressor.

Numerical Study of the Roughness Influence on NACA 63-430 Profile Aerodynamic Performance

2016 ◽  
Vol 10 (4) ◽  
pp. 231
Author(s):  
Abdekarim Tebbal ◽  
Fethi Saidi ◽  
Boualem Noureddine ◽  
Bachir Imine ◽  
Benameur Hamoudi
Keyword(s):  
Numerical Study ◽  
Aerodynamic Performance

Aerodynamic Performance of a Helicopter Rotor Hovering in Close Proximity to the Obstacles with Penetration Boundary Condition

2016 ◽  
Vol 64 (1) ◽  
pp. 65-70
Author(s):  
Naohiro IBOSHI ◽  
Noriaki ITOGA ◽  
Yasuhide YAMANAKA ◽  
Abdul KADIR, ◽  
Yuzaburou HAYASHI ◽  
...  
Keyword(s):  
Boundary Condition ◽  
Aerodynamic Performance ◽  
Helicopter Rotor ◽  
Close Proximity
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