Fan noise reduction of an aircraft engine by inclining the outlet guide vanes

Khaletskiy, Yu. D.; Pochkin, Y.S.

doi:10.1134/s1063771014060098

Cited by 7 publications

(3 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The plane sound wave in a space filled with moving from the right to the left (against x-direction) medium with averaged Mach number M and limited from the left by plane 0 x  on which the acoustic source specified by (5), and on the right by an acoustically perfect reflecting plane xL  is considered. The wave equation (1) in this case is simplified to the form:…”

Section: Plane Wave Reflectionmentioning

confidence: 99%

“…These issues in the developed world receive increasing attention, which is reflected in a significant tightening of the requirements for limiting the noise level in accordance with ISO standards [1,2] . Numerical modeling of the computer cooling fan acoustics becomes an engineering problem of current interest [3] as well as for train fans [4] and modern aircraft turbofan engines [5].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical Method for Modeling the Turbofan Engine Tonal Fan BPF Noise Generation and Propagation Accounting the SAS Complex Acoustic Impedance

Timushev¹,

Gavrilyuk²,

Aksenov³

et al. 2018

IJET

View full text Add to dashboard Cite

Noise reduction issues in the developed world receive an increasing attention, which is reflected in a great tightening of the noise level requirements. For the practical solution of this problem authors propose a new high-performance numerical modeling method of three-dimensional tonal noise acoustic field generated by the fan as a bladed machine. The method is based on solving a boundary value problem for Fourier transformed convective wave equation with complex variables in a Cartesian coordinate system in the arbitrary domain with impedance boundary conditions by finite volume method. The noise source is set in the form of sound power on the surface near the rotor that bounds the area of the vortex perturbations (pseudosound). Sound power is determined by acoustic-vortex method. There are shown examples of the method validation and application.

show abstract

Section: Plane Wave Reflectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Method for Modeling the Turbofan Engine Tonal Fan BPF Noise Generation and Propagation Accounting the SAS Complex Acoustic Impedance

Timushev¹,

Gavrilyuk²,

Aksenov³

et al. 2018

IJET

View full text Add to dashboard Cite

show abstract

“…This is because the traditional guide vane is fixed on the guide vane hub with a fixed angle for the design condition and cannot be adjustable with the change in working conditions. The literature on OGV investigations for aircraft engine mainly falls into the following categories: effects of OGV on aircraft engine's noise [2][3][4], unsteady interaction between the stationary OGVs and the rotor [5], and flow characteristics of OGVs [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Improvement of the Efficiency of the Axial-Flow Pump at Part Loads due to Installing Outlet Guide Vanes Mechanism

Yang

Zhao

Liu

2016

Mathematical Problems in Engineering

View full text Add to dashboard Cite

In order to investigate the influence of adjustable outlet guide vane on the hydraulic performance of axial-flow pump at part loads, the axial-flow pump with 7 different outlet guide vane adjustable angles was simulated based on the RNG k-ε turbulent model and Reynolds time-averaged equations. The Vector graphs of airfoil flow were analyzed in the different operating conditions for different adjustable angles of guide vane. BP-ANN prediction model was established about the effect of adjustable outlet guide vane on the hydraulic performance of axial-flow pump based on the numerical results. The effectiveness of prediction model was verified by theoretical analysis and numerical simulation. The results show that, with the adjustable angle of guide vane increasing along clockwise, the high efficiency area moves to the large flow rate direction; otherwise, that moves to the small flow rate direction. The internal flow field of guide vane is improved by adjusting angle, and the flow separation of tail and guide vane inlet ledge are decreased or eliminated, so that the hydraulic efficiency of pumping system will be improved. The prediction accuracy of BP-ANN model is 1%, which can meet the requirement of practical engineering.

show abstract

Flow-induced noise and vibration in axial fan: a case study

Bakhtar,

Alsahafi,

Almehmadi

et al. 2024

J. Umm Al-Qura Univ. Eng.Archit.

View full text Add to dashboard Cite

Reducing axial fan noise is crucial in residential, commercial, and industrial applications. This study explores how attaching different add-on designs to axial fans reduces aerodynamic noise. Eight design cases were examined, including extending the outlet and inlet ducts, using Chevron nozzles, placing internal spherical balls in staggered and straight patterns, applying a wavy inner wall treatment, and combining some of these nozzle designs. CFD and acoustic analyses were performed using Ansys Fluent 2022 R1. Noise reduction was measured at the nozzle outlet in each design case. All nozzle modifications reduced noise levels, with noise reductions ranging from 3 to 10% at the blade tip and 26–55% at the outlet. As an add-on to existing fan cases, the design cases investigated in this study can potentially improve the acoustic environment in various settings. The findings of this study can contribute to the development of quieter axial fans.

show abstract

Fan noise reduction of an aircraft engine by inclining the outlet guide vanes

Cited by 7 publications

References 6 publications

Numerical Method for Modeling the Turbofan Engine Tonal Fan BPF Noise Generation and Propagation Accounting the SAS Complex Acoustic Impedance

Numerical Method for Modeling the Turbofan Engine Tonal Fan BPF Noise Generation and Propagation Accounting the SAS Complex Acoustic Impedance

Improvement of the Efficiency of the Axial-Flow Pump at Part Loads due to Installing Outlet Guide Vanes Mechanism

Flow-induced noise and vibration in axial fan: a case study

Contact Info

Product

Resources

About