Dynamic mode decomposition of the acoustic field in radial compressors

Broatch, A.; García-Tíscar, J.; Roig, Ferran; Sharma, Sudhaa

doi:10.1016/j.ast.2019.05.015

Cited by 50 publications

(27 citation statements)

References 58 publications

(80 reference statements)

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“…Gaudé et al [12] used arrays of pressure sensors for the inlet and outlet ducts in order to decompose the in-duct pressure wave to determine SIL. A similar approach was then used by Broatch et al [15,18] and Torregrosa et al [16,19] demonstrating the robustness of a beamforming based pressure decomposition approach over conventional two port and single sensor methods. The authors [16,19] also demonstrated a good correlation between internal and external noise measurement results.…”

Section: Introductionmentioning

confidence: 96%

Acoustic characterisation of a small high-speed centrifugal compressor with casing treatment: An experimental study

Sharma

Broatch

García-Tíscar

et al. 2019

Aerospace Science and Technology

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With the advancements in manufacturing, materials and computational methods, turbomachinery designs have become more efficient providing higher specific power and reliability with lower weight and cost. The rotational speed of turbomachines has increased while the overall machine size has decreased for a similar power output leading to the pervasive presence of small, high-speed turbomachines, specifically centrifugal compressors in helicopters, unmanned aerial vehicles (UAVs), auxiliary power units (APUs), turbochargers and micro gas turbines. In addition to superior aerodynamic performance over a wide range, increased operating speeds have made the acoustic emissions of small centrifugal compressors a critical aspect of design. Therefore, this work presents an experimental campaign to characterise the acoustic behaviour of a compressor with an intent to quantify the dominant features of the flow-induced noise for design and near surge operating conditions. Furthermore, the campaign is extended to establish the impact of the ported shroud casing treatment and operating speed on the acoustic emission of the compressor. The induct noise measurement method is used in this work to quantify the noise generated in the compressor by measuring pressure fluctuations near the inducer and diffuser while the propagation of the generated noise to the ducts is computed from an array of piezoelectric sensors. Spectra at the design operating point are dominated by tonal noise while broadband noise content is the dominant feature of spectra for near surge operation. Although the ported shroud cavity does not significantly alter the overall noise levels of the compressor operating at design condition, it does seem to propagate tonal noise. For near surge operation, the casing treatment positively impacts the acoustic emission with a reduction of approximately 10 dB in the range up to the blade pass frequency. Furthermore, various broadband features are also observed to be alleviated by the casing treatment.

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Section: Introductionmentioning

confidence: 96%

Acoustic characterisation of a small high-speed centrifugal compressor with casing treatment: An experimental study

Sharma

Broatch

García-Tíscar

et al. 2019

Aerospace Science and Technology

Self Cite

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“…Schmid presented dynamic mode decomposition (DMD) by improving SVD, and the aim of isolating modes of a single frequency was accomplished [29]. Broatch successfully solved the problem that the decomposition effect of the acoustic pressure signal of a centrifugal compressor was not ideal using DMD [30]. Semlitsch successfully separated the flow characteristic signal of a centrifugal compressor during surging using DMD [31].…”

Section: Introductionmentioning

confidence: 99%

A Linear Narrowband Filtering Method Based on Migration-Enhanced Singular Value Decomposition and Its Application to Reduce Noise

Zeng

Tao

et al. 2020

IEEE Access

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With the development of the aviation industry, the limit of aeroengine noise is becoming increasingly stringent. Vibration mode extraction is the most commonly used method for reducing the noise of compressor, which is the main source of aeroengine noise. In vibration mode extraction, inherent errors occur due to the inherent defects in the measurement and analysis. To solve the problem, the acoustic pressure signal, which is among the most common and accurately measured signals and contains much useful information, is selected for analysis to eliminate the inherent errors. In addition, to compensate for the lack of analysis methods, based on the characteristics of the singular value decomposition (SVD) and acoustic pressure signals, a linear narrowband filtering method based on migration-enhanced singular value decomposition (LNF-MSVD) is proposed to accurately extract the acoustic mode from acoustic pressure signal to reduce the noise of a high-pressure-ratio axial flow compressor. The steps of LNF-MSVD are listed after determining the method's feasibility and effectiveness, as well as the amplitude and frequency standards of the excitation signal. Using this method, the acoustic mode was extracted accurately and clearly shown using an acoustic modal diagram, which was used to acquire experimental acoustic modal order. The superiority of LNF-MSVD for extracting acoustic mode was confirmed by a comparison with SVD and wavelet analyses. By comparing experimental acoustic modal order with theoretical acoustic modal order calculated through an empirical formula, the likely source of noise of the compressor was successfully located. INDEX TERMS Acoustic mode, high-pressure-ratio axial flow compressor, migration-enhanced singular value decomposition, noise source location.

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“…Recent attempts to understand the relationship between flow and acoustic features of a PS compressor are made by decomposing the numerical flow field using proper orthogonal decomposition 11,12 and dynamic mode decomposition 13 Order (RO) tones or 'buzz-saw' tones 11,18 and Blade Pass Frequency (BPF) while broadband features include the so called 'whoosh' noise which is observed within the plane wave frequency range and Tip Clearance Noise (TCN) 18,19 seen beyond the plane wave frequency.…”

Section: Introductionmentioning

confidence: 99%

Evolution of flow characteristics in a centrifugal compressor with an increase in operating speed

Sharma

García-Tíscar

Allport

et al. 2020

International Journal of Engine Research

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Developments in materials, manufacturing and computing methods have catalysed the generation of efficient compressor designs with higher specific power outputs. Centrifugal compressors have become pervasive in environments demanding a combination of higher power with smaller sizes such as unmanned aerial vehicles, micro gas turbines and turbochargers. These compressors are expected to perform optimally in a range of operational speeds and mass flow states with low acoustic emissions. The impact of operating speed on the flow and acoustic characteristics of a ported shroud compressor has been explored in this work. The operation of the open and blocked configurations of the compressor at the design and near surge points each of a lower and a higher speedline was numerically and experimentally investigated. Comparing the results, the model was shown to predict the operation of the compressor for both configurations at the investigated operating points satisfactorily in terms of both performance and dominant acoustic features. With an increase in the velocity and the Mach number due to increased operational speed, changes in the flow behaviour in the inducer and diffuser were observed. An increase in operational speed was shown to generally increase the overall acoustic emission of the compressor for both configurations. The number of distinct tones in the acoustic output and their magnitude were also seen to be a function of operating speed.

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Dynamic mode decomposition of the acoustic field in radial compressors

Cited by 50 publications

References 58 publications

Acoustic characterisation of a small high-speed centrifugal compressor with casing treatment: An experimental study

Acoustic characterisation of a small high-speed centrifugal compressor with casing treatment: An experimental study

A Linear Narrowband Filtering Method Based on Migration-Enhanced Singular Value Decomposition and Its Application to Reduce Noise

Evolution of flow characteristics in a centrifugal compressor with an increase in operating speed

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