Comprehensive Aeromechanics Predictions on Air and Structural Loads of HART I Rotor

Na, Deokhwan; You, nghyun; Jung, Sung Nam

doi:10.5139/ijass.2017.18.1.165

Cited by 2 publications

(3 citation statements)

References 6 publications

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“…The variations in the angle β do not provide significant effects on the lift coefficient since the proposed tail-sitter has a swept trapezoidal wing. This behavior matches those reported in the literature for the trapezoidal wings [1,19,55,56]. Figure 19b shows the behavior of the drag coefficient against changes in the angles α and β.…”

Section: Aerodynamic Properties Of the Tail-sittersupporting

confidence: 87%

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Design and Determination of Aerodynamic Coefficients of a Tail-Sitter Aircraft by Means of CFD Numerical Simulation

et al. 2022

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Vertical take-off and landing (VTOL) aircraft have become important aerial vehicles for various sectors, such as security, health, and commercial sectors. These vehicles are capable of operating in different flight modes, allowing for the covering of most flight requirements in most environments. A tail-sitter aircraft is a type of VTOL vehicle that has the ability to take off and land vertically on it elevators (its tail) or on some rigid support element that extends behind the trailing edge. Most of the tail-sitter aircraft are designed with a fixed-wing adaptation rather than having their own design. The design of the tail-sitter carried out in this work had the particularity of not being an adaptation of a quad-rotor system in a commercial swept-wing aircraft, but, rather, was made from its own geometry in a twin-rotor configuration. The design was performed using ANSYS SpaceClaim CAD software, and a numerical analysis of the performance was carried out in ANSYS Fluent CFD software. The numerical results were satisfactorily validated with empirical correlations for the calculation of the polar curve, and the performance of the proposed tail-sitter was satisfactory compared to those found in the literature. The results of velocity and pressure contours were obtained for various angles of attack. The force and moment coefficients obtained showed trends similar to those reported in the literature.

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Section: Aerodynamic Properties Of the Tail-sittersupporting

confidence: 87%

“…The drag coefficient reaches its minimum value of 0.02017 when the angle of attack is 0°and reaches 0.17 when α = 14. This magnitude is within the adequate range for trapezoidal wings as reported in the literature [1,19,55,56].…”

Section: Aerodynamic Properties Of the Tail-sittersupporting

confidence: 83%

Design and Determination of Aerodynamic Coefficients of a Tail-Sitter Aircraft by Means of CFD Numerical Simulation

et al. 2022

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“…140) condition of HART rotor is considered. It is noted that a pitch-bearing stiffness of 1706 N-m/rad is used to match the first torsion frequency and to represent the control system characteristic of HART rotor [21].…”

Section: Resultsmentioning

confidence: 99%

Data Transfer Schemes in Rotorcraft Fluid-Structure Interaction Predictions

You

Jung

2018

International Journal of Aerospace Engineering

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For a CFD (computation fluid dynamics)/CSD (computational structural dynamics) coupling, appropriate data exchange strategy is required for the successful operation of the coupling computation, due to fundamental differences between CFD and CSD analyses. This study aims at evaluating various data transfer schemes of a loose CFD/CSD coupling algorithm to validate the higher harmonic control aeroacoustic rotor test (HART) data in descending flight. Three different data transfer methods in relation to the time domain airloads are considered. The first (method 1) uses random data selection matched with the timewise resolution of the CSD analysis whereas the last (method 2) adopts a harmonic filter to the original signals in CFD and CSD analyses. The second (method 3) is a mixture of the two methods. All methods lead to convergent solutions after a few cycles of coupling iterations are marched. The final converged solutions for each of the data transfer methods are correlated with the measured HART data. It is found that both method 1 and method 2 exhibit nearly identical results on airloads and blade motions leading to excellent correlations with the measured data while the agreement is less satisfactory with method 3. The reason of the discrepancy is identified and discussed illustrating CFD-/CSD-coupled aeromechanics predictions.

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Comprehensive Aeromechanics Predictions on Air and Structural Loads of HART I Rotor

Cited by 2 publications

References 6 publications

Design and Determination of Aerodynamic Coefficients of a Tail-Sitter Aircraft by Means of CFD Numerical Simulation

Design and Determination of Aerodynamic Coefficients of a Tail-Sitter Aircraft by Means of CFD Numerical Simulation

Data Transfer Schemes in Rotorcraft Fluid-Structure Interaction Predictions

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