Comparison and evaluation of blade element methods against RANS simulations and test data

Bergmann, Ole; Götten, Falk; Braun, Carsten; Janser, Frank

doi:10.1007/s13272-022-00579-1

Cited by 22 publications

(9 citation statements)

References 36 publications

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“…Validation The aerodynamic module was previously compared to other available methods, including approaches based on potential flow theory, commercial CFD tools applying RANS simulations, and experimental test data. The aerodynamic module agrees well with experimental and CFD data in most investigated cases, even though aeroelastic deformations were not considered [24].…”

Section: Numerical Approach: Propcodesupporting

confidence: 68%

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On the influence of elasticity on propeller performance: a parametric study

et al. 2023

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The aerodynamic performance of propellers strongly depends on their geometry and, consequently, on aeroelastic deformations. Knowledge of the extent of the impact is crucial for overall aircraft performance. An integrated simulation environment for steady aeroelastic propeller simulations is presented. The simulation environment is applied to determine the impact of elastic deformations on the aerodynamic propeller performance. The aerodynamic module includes a blade element momentum approach to calculate aerodynamic loads. The structural module is based on finite beam elements, according to Timoshenko theory, including moderate deflections. Several fixed-pitch propellers with thin-walled cross sections made of both isotropic and non-isotropic materials are investigated. The essential parameters are varied: diameter, disc loading, sweep, material, rotational, and flight velocity. The relative change of thrust between rigid and elastic blades quantifies the impact of propeller elasticity. Swept propellers of large diameters or low disc loadings can decrease the thrust significantly. High flight velocities and low material stiffness amplify this tendency. Performance calculations without consideration of propeller elasticity can lead to decreased efficiency. To avoid cost- and time-intense redesigns, propeller elasticity should be considered for swept planforms and low disc loadings.

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Section: Numerical Approach: Propcodesupporting

confidence: 68%

“…The nonlinear momentum approach also incorporates corrections for tip and root losses, sweep, and post-stall behavior. Further information on the model can be found in [24].…”

Section: Numerical Approach: Propcodementioning

confidence: 99%

On the influence of elasticity on propeller performance: a parametric study

et al. 2023

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“…The flow field is calculated with ANSYS CFX 2020R1 with the multiple reference frames(MRF) model. MRF simulations are sufficient for thrust and torque prediction of an open propeller and can reduce the CPU time of rigid body motion simulations [27]. In the rotation domain, the flow around a propeller by assigning a constant rotational velocity while the solid structure of the propeller itself remains fixed [28][29][30][31].…”

Section: Mesh and Cfd Setupmentioning

confidence: 99%

Rapid Design Method of Heavy-Loaded Propeller for Distributed Electric Propulsion Aircraft

Shi,

Huo,

Liu

et al. 2024

Energies

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On Distributed Electric Propulsion (DEP) aircraft, the deployment of numerous high-lift propellers with small diameters on the wing’s leading edge significantly enhances lift during low-speed flight. The increase in the number of propellers leads to a decrease in diameter, which increases the disc loading. In this paper, a rapid design method applicable to heavy-loaded propellers is developed and does not require iterative calculations compared to traditional heavy-loaded propeller design methods, enabling rapid completion of the propeller design. The results of CFD computation show that the relative thrust error of the method proposed in this paper is within 5% for disc loading ranging from 600 Pa to 1400 Pa, features a high-accuracy design of propellers with required thrust, and high thrust coefficients are achieved within large advance ratio range.

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“…Prandtl's tip and root loss correction attenuate the lift distribution [31]. The second author presents a detailed explanation and validation cases in reference [32].…”

Section: Steady-state Analysismentioning

confidence: 99%

Rapid Dynamic Load Estimation Procedure for Lifting Propellers in Forward Flight

Möhren,

Bergmann,

Janser

et al. 2024

Preprint

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Lifting propellers operate at oblique inflow and thus encounter severe dynamic loads during forward flight, impacting structural integrity, fatigue, and vibration. Numerical optimization approaches consider aerodynamic, structural mechanical, and aeroacoustic aspects within preliminary design. To also account for dynamic loads during forward flight, a novel procedure allows their rapid estimation. Based on steady-state simulations combining strip theory and finite beam elements, aerodynamic excitation, damping, and stiffness are defined in the frequency domain. Loads are derived through a linear inflow model and quasi-steady aerodynamics. Damping and stiffness loads are linearized and transferred into matrix form to calculate the frequency response. The computationally expensive need for simulations in the time domain is thus avoided. Applicability extends to both fixed and variable pitch lifting propellers utilized in large multicopters for cargo or passenger transportation. Comparisons to time-marching simulations show good agreement with deviations of approximately \SI{10}{\percent}. The analytical derivation yields physical insights to understand and reduce dynamic loads and their magnification due to resonance.

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Comparison and evaluation of blade element methods against RANS simulations and test data

Cited by 22 publications

References 36 publications

On the influence of elasticity on propeller performance: a parametric study

On the influence of elasticity on propeller performance: a parametric study

Rapid Design Method of Heavy-Loaded Propeller for Distributed Electric Propulsion Aircraft

Rapid Dynamic Load Estimation Procedure for Lifting Propellers in Forward Flight

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