Numerical Study of Aerodynamics of a Wing-in-Ground-Effect Craft

Qu, Qiulin; Lu, Zhe; Liu, Peiqing; Agarwal, Ramesh K.

doi:10.2514/1.c032531

Cited by 48 publications

(20 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…CFD simulations were performed using ANSYS Fluent 17.0 (ANSYS, Inc., Canonsburg, PA, USA), which has been extensively used in various studies [9][10][11][12][13]. Steady and unsteady Reynolds-averaged Navier-Stokes (RANS) equations for the mean flow quantities were solved.…”

Section: Boundary Condition and Simulation Setupmentioning

confidence: 99%

Numerical Study of Transition of an Annular Lift Fan Aircraft

Jiang

Zhang

2016

Aerospace

View full text Add to dashboard Cite

The present study aimed at studying the transition of annular lift fan aircraft through computational fluid dynamics (CFD) simulations. The oscillations of lift and drag, the optimization for the figure of merit, and the characteristics of drag, yawing, rolling and pitching moments in transition are studied. The results show that a two-stage upper and lower fan lift system can generate oscillations of lift and drag in transition, while a single-stage inner and outer fan lift system can eliminate the oscillations. The characteristics of momentum drag of the single-stage fans in transition are similar to that of the two-stage fans, but with the peak of drag lowered from 0.63 to 0.4 of the aircraft weight. The strategy to start transition from a negative angle of attack −21 • further reduces the peak of drag to 0.29 of the weight. The strategy also reduces the peak of pitching torque, which needs upward extra thrusts of 0.39 of the weight to eliminate. The peak of rolling moment in transition needs differential upward thrusts of 0.04 of the weight to eliminate. The requirements for extra thrusts in transition lead to a total thrust-weight ratio of 0.7, which makes the aircraft more efficient for high speed cruise flight (higher than 0.7 Ma).

show abstract

Section: Boundary Condition and Simulation Setupmentioning

confidence: 99%

Numerical Study of Transition of an Annular Lift Fan Aircraft

Jiang

Zhang

2016

Aerospace

View full text Add to dashboard Cite

show abstract

“…CFD simulations were performed using ANSYS Fluent 17.0, which has been extensively used in various studies [15][16][17][18][19]. The 3D Reynolds-averaged Navier-Stokes (RANS) equations for the mean flow quantities were solved.…”

Section: Boundary Condition and Simulation Setupmentioning

confidence: 99%

CFD Study of a New Annular Lift Fan Configuration with High Lift Efficiency

Jiang

Zhang

2017

Aerospace

View full text Add to dashboard Cite

Abstract:A new annular lift fan configuration that has very high lift efficiency is explored by using a numerical scheme. The inlet lip radius and diffuser angle are maximized by semicircle duct walls and the location of the lift fan is moved from the throat to the diffuser area to maximize the diffusion effect of the ducted fan. The improved lift fan achieves the figure of merit of 0.772 and the power loading of 9.03 lbs/hp without ground effect, very close to the theoretical limit. Under the ground effect, the figure of merit reaches 0.822 with the power loading of 9.62 lbs/hp. The improved lift efficiency deteriorates the transition characteristics with higher momentum drag and pitching moment. However, with the aid of jet thrusts directly providing part of the lift during transition, the peak of momentum drag and pitching moment can be lowered. A total thrust to weight ratio of 0.7 is enough for all of the requirements in transition and in hover and for the maximum speed of 0.75 Mach in cruise flight.

show abstract

“…Fluid dynamic simulations were performed using ANSYS Fluent 14.5, which has been used in various studies [6,[9][10][11][12]. The 3D Reynolds-averaged Navier-Stokes (RANS) equations for the mean flow quantities were solved with different turbulence models.…”

Section: Boundary Condition and Simulation Setupmentioning

confidence: 99%

CFD Study of an Annular-Ducted Fan Lift System for VTOL Aircraft

2015

View full text Add to dashboard Cite

Abstract:The present study aimed at assessing a novel annular-ducted fan lift system for VTOL aircraft through computational fluid dynamics (CFD) simulations. The power and lift efficiency of the lift fan system in hover mode, the lift and drag in transition mode, the drag and flight speed of the aircraft in cruise mode and the pneumatic coupling of the tip turbine and jet exhaust were studied. The results show that the annular-ducted fan lift system can have higher lift efficiency compared to the rotor of the Apache helicopter; the smooth transition from vertical takeoff to cruise flight needs some extra forward thrust to overcome a low peak of drag; the aircraft with the lift fan system enclosed during cruise flight theoretically may fly faster than helicopters and tiltrotors based on aerodynamic drag prediction, due to the elimination of rotor drag and compressibility effects on the rotor blade tips; and pneumatic coupling of the tip turbine and jet exhaust of a 300 m/s velocity can provide enough moment to spin the lift fan. The CFD results provide insight for future experimental study of the annular-ducted lift fan VTOL aircraft.

show abstract

Numerical Study of Aerodynamics of a Wing-in-Ground-Effect Craft

Cited by 48 publications

References 20 publications

Numerical Study of Transition of an Annular Lift Fan Aircraft

Numerical Study of Transition of an Annular Lift Fan Aircraft

CFD Study of a New Annular Lift Fan Configuration with High Lift Efficiency

CFD Study of an Annular-Ducted Fan Lift System for VTOL Aircraft

Contact Info

Product

Resources

About