Effect of geometric parameters on the noise generated by rod-airfoil configuration

Sharma, Sparsh; Geyer, Thomas; Giesler, Jens

doi:10.1016/j.apacoust.2021.107908

Cited by 17 publications

(3 citation statements)

References 49 publications

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“…p ref has a reference value of 2 × 10 −5 N/m 2 . The implementation of Curle's equation is validated in [25,26].…”

Section: Noise Generationmentioning

confidence: 99%

Efficient Prediction of Turbulent Inflow and Leading-Edge Interaction Noise Using a Vortex Particle Method with Look-up Table Approach

Sharma,

Herr

2024

J. Phys.: Conf. Ser.

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This paper presents a new, efficient approach for predicting turbulent inflow, also known as leading-edge interaction noise. The method combines a low-fidelity Vortex Particle Method (VPM) with a look-up table approach. Its goal is to reconstruct realistic inflow turbulence and airfoil contours using stochastic control variables within a limited vortex window. To model far-field sound emission, Curle’s equation and a vortex sound database are employed. To increase confidence in the methodology, an analysis of inflow turbulence parameters and source characteristics was performed using systematic Large Eddy Simulations (LES). A generic NACA 0012 airfoil test case with different inflow turbulence grids was used for direct comparisons with semi-theoretical and semi-empirical predictions from the literature. The comparison is restricted to Amiet/Gershfeld predictions as the current model is only capable of dealing with homogeneous and isotropic turbulence. However, their usefulness is limited to narrower parameter ranges when compared to the more generally applicable new method. A satisfactory agreement of the results demonstrates the versatility of the proposed method.

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“…p ref has a reference value of 2 × 10 −5 N/m 2 . The implementation of Curle's equation is validated in [25,26].…”

Section: Noise Generationmentioning

confidence: 99%

Efficient Prediction of Turbulent Inflow and Leading-Edge Interaction Noise Using a Vortex Particle Method with Look-up Table Approach

Sharma,

Herr

2024

J. Phys.: Conf. Ser.

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“…The RANS method was used in the turbulent core region, which can significantly reduce the calculated amount and ensure the calculation efficiency without sacrificing calculation precision [26]. Since the DES model's detailed derivation process can be seen in [27][28][29][30], it is not repeated in this study.…”

Section: Turbulence Modelmentioning

confidence: 99%

Study on Vibration Attenuation Performance of Pump-Jet Propulsor Duct with an Axial Slot Structure

Ke,

Ye,

Zou

2023

JMSE

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To reduce the structural vibration of the duct structure in pump-jet propulsors (PJPs) and lower the induced vibration noise, this study learned from the “processor box” in an aero-engine and set a certain number of axial slots in the PJP. First, using finite element analysis, both dry and wet modes of the PJP ducts with and without an axial slot structure were simulated for analysis. Next, with the two-way fluid–solid coupling calculation method, the vibration performances of the PJP ducts with and without axial slots were contrasted and studied. The differences in calculation results under different duct structures were compared from three aspects—the vibration displacement, velocity, and acceleration of the duct and mesh nodes. According to the present results, after the addition of axial slots, the vibration displacement, the vibration velocity, and the vibration acceleration can be significantly reduced, especially in the back segment of the duct. Meanwhile, it can be concluded that it is quite important to select vibration acceleration for structural analysis in evaluating the PJP vibration. This study can provide a reference for further designs of low-noise PJPs.

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“…Wind turbine performance depends considerably on the design of the blades, and in particular, the geometry of the airfoil. The airfoil is the core element of a blade [4]- [6] and it can also be used in many engineering applications [7]. Two of the most important factors that impact the performance of the airfoil are the lift/drag ratio (Cl/Cd) and lift coefficient.…”

Section: Introductionmentioning

confidence: 99%

Modified Trailing Edge Impact on the Aerodynamic Performance of Wind Turbine Airfoil

Jaafar

Abdelrahman

Mourad

et al. 2022

ARFMTS

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One of the most important factors affecting wind turbine performance is the airfoil. The impact of the NACA 0012 trailing edge design on airfoil performance is investigated numerically in this paper. Computational fluid dynamics calculations are used to design and simulate the airfoils. The thick trailing edge is inclined to various angles to achieve further improvement in the lift/drag ratio and lift coefficient. The results reveal that, when compared with baseline airfoil, all the designed airfoils demonstrated higher lift coefficients. The lift coefficient increases with the angle of the inclined trailing edge. The maximum lift coefficient improvement inclined airfoil is 74%. In addition, the lift/drag ratio increases with the increase of the inclined angle, and the maximum improvement ratio reaches 39.495% for the inclined airfoil with Ꝋ=15º. Any further increase in the inclined angle decreases the lift/drag ratio as a result of drag increase. This study contributes toward the design of efficient wind turbine airfoils.

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Effect of geometric parameters on the noise generated by rod-airfoil configuration

Cited by 17 publications

References 49 publications

Efficient Prediction of Turbulent Inflow and Leading-Edge Interaction Noise Using a Vortex Particle Method with Look-up Table Approach

Efficient Prediction of Turbulent Inflow and Leading-Edge Interaction Noise Using a Vortex Particle Method with Look-up Table Approach

Study on Vibration Attenuation Performance of Pump-Jet Propulsor Duct with an Axial Slot Structure

Modified Trailing Edge Impact on the Aerodynamic Performance of Wind Turbine Airfoil

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