Aeroakustische Auslegung von Triebwerksfans mittels multidisziplinärer Optimierungen

Jaron, Robert

doi:10.14279/depositonce-7057

Cited by 4 publications

(18 citation statements)

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“…This source results from the aerodynamic flow around the rotor blade and its interaction with the stator leading edge. Particularly, the velocity boundary layers on the suction and pressure sides of the rotor blades lead both to an inhomogeneous velocity distribution (rotor wake) and to an increased turbulence intensity behind the rotor [2]. These flow disturbances interact with the downstream stator vanes and generate the interaction noise.…”

Section: Rotor-stator Interaction Noisementioning

confidence: 99%

“…In general, the noise emission of fan stages is composed of several sources that can radiate noise at discrete frequencies (tonal noise) and throughout a wide frequency range (broadband noise). Typically, for low-speed fan stages, the rotor-stator interaction noise represents the dominant source [2]. An important challenge is to reduce the tonal component, as it is often perceived as unpleasant [3,4].…”

Section: Introductionmentioning

confidence: 99%

“…Analytical and numerical studies on low-speed fan stages indicate that the excitation of tonal rotor-stator interaction noise is significantly affected by the propagation angles of the acoustic modes relative to the stator leading edge angle [2,5,6]. In [6], an analytical and numerical acoustic investigation of fan stages with fewer stator than rotor blades is performed.…”

Section: Introductionmentioning

confidence: 99%

“…In [6], an analytical and numerical acoustic investigation of fan stages with fewer stator than rotor blades is performed. These designs are called low-count outer guide vane (OGV) fans [2,6]. It is shown that, for certain blade count numbers, a tonal advantage is achieved if the propagation angles of the dominantly excited modes are nearly parallel to the stator leading edge angle [2,6].…”

Section: Introductionmentioning

confidence: 99%

“…These designs are called low-count outer guide vane (OGV) fans [2,6]. It is shown that, for certain blade count numbers, a tonal advantage is achieved if the propagation angles of the dominantly excited modes are nearly parallel to the stator leading edge angle [2,6]. In recent measurements on a low-speed fan stage, the effect was also confirmed experimentally in design operating conditions [7].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Smart Blade Count Selection to Align Modal Propagation Angle with Stator Stagger Angle for Low-Noise Ducted Fan Designs

Schade,

Jaron,

Klähn

et al. 2024

Aerospace

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The rotor–stator interaction noise is a major source of fan noise. Especially for low-speed fan stages, the tonal component is typically a dominant noise source. A challenge is to reduce this tonal noise, as it is typically perceived as unpleasant. Therefore, in this paper, we analytically, numerically and experimentally investigate an acoustic effect to lower the tonal noise excitation. Our study on an existing low-speed fan indicates a reduction in tonal interaction noise of more than 9 dB at the source if the excited acoustic modes propagate parallel to the stator leading edge angle. Moreover, a design-to-low-noise approach is demonstrated in order to apply this effect to two new fan stages with fewer stator than rotor blades. The acoustic design of both fans is determined by an appropriate choice of the rotor and stator blade numbers in order to align the modal propagation angle with the stator stagger angle. The blade geometries are obtained from aerodynamic optimization. Both fans provide similar aerodynamic but opposing acoustic radiation characteristics compared to the baseline fan and a significant tonal noise reduction resulting from the impact of the modal propagation angle on noise excitation. To ensure that this effect can also be applied to other low-speed fans, a design rule is derived and validated.

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Section: Rotor-stator Interaction Noisementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Smart Blade Count Selection to Align Modal Propagation Angle with Stator Stagger Angle for Low-Noise Ducted Fan Designs

Schade,

Jaron,

Klähn

et al. 2024

Aerospace

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Mechanisms to reduce the blade passing frequency tone for subsonic low-count OGV fans

Schade

Jaron

Moreau

et al. 2022

Aerospace Science and Technology

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Multidisciplinary Design Optimization of a Low-Noise and Efficient Next-Generation Aero-Engine Fan

Jaron¹,

Moreau²,

Guérin

et al. 2021

Journal of Turbomachinery

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Due to the increasing bypass ratios of modern engines, the fan stage is increasingly becoming the dominant source of engine noise. Accordingly, it is becoming more and more important to develop not only efficient but also quiet fan stages. In this paper the noise emission of a fan for an aero-engine with bypass ratio of 19 is reduced within a multidisciplinary design optimization (MDO) by means of a hybrid noise prediction method while at the same time optimizing the aerodynamic efficiency. The aerodynamic performance of each configuration in the optimization is evaluated by stationary Reynolds-Averaged Navier- Stokes (RANS) simulations. These stationary flow simulations are also used to extract the aerodynamic excitation sources for the analytical fan noise prediction. The resulting large database of the optimization provides new insights into which extent an MDO can contribute to the design of both quiet and efficient fan stages. In addition to that the hybrid approach of numerical flow solutions and analytical description of the noise sources enables to understand the noise reduction mechanisms. In particular, the influence of rotor blade loading on the aerodynamic efficiency and the noise sources as well as the potential of configurations with a comparatively low number of outlet guide vanes (OGV) is explored.

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Aeroakustische Auslegung von Triebwerksfans mittels multidisziplinärer Optimierungen

Cited by 4 publications

References 0 publications

Smart Blade Count Selection to Align Modal Propagation Angle with Stator Stagger Angle for Low-Noise Ducted Fan Designs

Smart Blade Count Selection to Align Modal Propagation Angle with Stator Stagger Angle for Low-Noise Ducted Fan Designs

Mechanisms to reduce the blade passing frequency tone for subsonic low-count OGV fans

Multidisciplinary Design Optimization of a Low-Noise and Efficient Next-Generation Aero-Engine Fan

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