Numerical Calculations on the Unsteady Aerodynamic Force of the Tilt-Rotor Aircraft in Conversion Mode

Chen, Hao

doi:10.1155/2019/2147068

Cited by 5 publications

(3 citation statements)

References 25 publications

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“…Compared to fixed-wing airplanes, tilt-rotors can perform vertical takeoff and landing, require less runway, and exhibit better adaptability to various terrains. In contrast to conventional helicopters, tilt-rotors boast higher cruise speeds, extended ranges, reduced vibrations, lower fuel consumption, and increased payload capacity [3]. Furthermore, when compared to both helicopters and fixed-wing aircraft, tilt-rotor aircraft possess a wider flight envelope [4].…”

Section: Aerodynamic Layout Design and Characteristics Of Tilt-rotor ...mentioning

confidence: 99%

Analysis of the Pneumatics principles of several aircrafts

Zhan

2023

TNS

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In recent years, the advancement of science and technology, particularly the development of flight control technology, has driven the progress of aircraft technology, which facilitates the rapid development of many kinds of aircraft. Pneumatics, the mechanics of gas flow, is used to study aerodynamics. In the design and manufacturing of aircraft, gas flow has a significant impact on the movement, control, attitude, stability, and other aspects of the aircraft. This paper describes the basic Pneumatics principles in aircraft design: aerodynamics is the discipline that studies the interaction between airflow and aircraft, it is the core foundation of aircraft external shape design, a pivotal discipline in overall design, and a prerequisite for conducting design analyses in fields, it plays a crucial role in aircraft design and force analysis for the aircraft, and this paper also introduces the aerodynamic layout design and aerodynamic characteristics of tilt-rotor Unmanned Aerial Vehicle (UAV), multi-rotor aircraft and bionic flapping wing aircraft, so as to offer some references for future study of air vehicles.

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Section: Aerodynamic Layout Design and Characteristics Of Tilt-rotor ...mentioning

confidence: 99%

Analysis of the Pneumatics principles of several aircrafts

Zhan

2023

TNS

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“…Figure 3 shows the surface grid of the wing and symmetry plane. International Journal of Aerospace Engineering the three-dimensional RANS equation in a conservative differential form is shown as follows [14]:…”

Section: Geometry Modeling and Grid Generationmentioning

confidence: 99%

Lift Enhancement of Tiltrotor Wing Using a Gurney Flap

Chen

2022

International Journal of Aerospace Engineering

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A numerical investigation was undertaken to explore the lift-enhancing characteristics of the Gurney flap on a tiltrotor wing. The heights of Gurney flaps range from 1 to 4% wing chord lengths. The Navier-Stokes equations with the Spalart-Allmaras turbulence model were solved to simulate the flow structure around the Gurney flap. The computational results show that the presence of the Gurney flap can dramatically improve the tiltrotor wing lift coefficient. Compared with the baseline configuration, the maximum lift coefficient is increased by 10.67, 15.33, and 20.67% for the 1, 2, and 4% height Gurney flaps. On the other hand, the Gurney flap also results in a drag penalty, and the overall effect on the wing lift-to-drag is detrimental. In particular, at an angle of attack of 2°, use of a 4% chord length Gurney flap decreases the lift-to-drag ratio by 31.47%. Further studies demonstrate that the wing lift increments are proportional to the square root of the Gurney flap height.

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“…The incoming flow and the aerodynamic environment of the rotor blades change markedly, complicating the structural deformation and strongly affecting the aerodynamics of the blades. Former researchers, from the viewpoints of aerodynamics [1][2][3] and structural dynamics [4][5][6][7], simulated and analyzed conversion flight, demonstrating the relationship between tilt angle and the unsteady characteristics of the aerodynamic environment and the problem of aeroelastic stability that occurs in conversion flight. However, the influence of blade deformation on the aerodynamic characteristics of conversion flight is not deeply researched, and the coupling method has rarely been used in such investigations.…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of Soft In-Plane and Stiff In-Plane Tiltrotor Blade Aerodynamics in Conversion Flight, Using CFD-CSD Coupling Approach

Hu,

Yu,

et al. 2024

Aerospace

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Tiltrotors permit aircrafts to operate vertically with lift, yet convert to ordinary forward flight with thrust. The challenge is to design a tiltrotor blade yielding maximum lift and thrust that converts smoothly without losing integrity or efficiency. The two types of blades, soft in-plane and stiff in-plane—the designation depending on the value of the blade’s natural lag frequency—exhibit different structural responses under the same flight conditions, differently affecting the aerodynamics of the blades, especially in the complex aerodynamic environment of conversion flight where the aerodynamic differences are significant. This phase of flight is not deeply researched, nor is the analytical coupling method much used. To study the influence of blade type on aerodynamics during conversion, models suitable for the conversion flight simulation are established for the application of coupled computational fluid dynamics and computational structural dynamics (CFD-CSD) methods. Each method is implemented with well-accepted techniques (the Unsteady Reynolds-Averaged Navier–Stokes (URANS) equations, the Reverse Overset Assembly Technique (ROAT), and the Timoshenko beam model. To improve the solving efficiency, a loose coupling strategy is used in constructing the two-way coupled model. The XV-15 tiltrotor is used for verification. The aeroelastic simulation of soft in-plane and stiff in-plane blades in conversion flight indicates an impactful role on the modal shapes, with a significant difference in the third flap modal shapes for the XV-15 rotor. However, the effect on aerodynamic performance is relatively small. In the first half of the flight conversion, the thrust of stiff in-plane blades is larger than that of soft in-plane blades, but in the last half, the influence of structural characteristics on aerodynamic performance is negligible and the thrust of the blades tends to be equal.

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Numerical Calculations on the Unsteady Aerodynamic Force of the Tilt-Rotor Aircraft in Conversion Mode

Cited by 5 publications

References 25 publications

Analysis of the Pneumatics principles of several aircrafts

Analysis of the Pneumatics principles of several aircrafts

Lift Enhancement of Tiltrotor Wing Using a Gurney Flap

Comparative Study of Soft In-Plane and Stiff In-Plane Tiltrotor Blade Aerodynamics in Conversion Flight, Using CFD-CSD Coupling Approach

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