Generation Mechanism of Broadband Whoosh Noise in an Automotive Turbocharger Centrifugal Compressor

Dehner, Rick; Sriganesh, Pranav; Selamet, Ahmet; Miazgowicz, Keith

doi:10.1115/1.4051274

Cited by 6 publications

(1 citation statement)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Numerical simulation of compressor noise usually couples computational fluid dynamics (CFD) and computational aerodynamic acoustics (CAA) methods [18][19][20]. Dehner et al [21] studied the noise emissions of a turbocharger centrifugal compressor from a spark-ignition engine using the experiments, CFD and modal decomposition methods. The results showed the whooshing noise primarily propagated along the duct in acoustic azimuthal modes.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Mechanism Study of Aerodynamic Noise Emission Characteristics from a Turbocharger Compressor of Heavy-Duty Diesel Engine Based on Full Operating Range

Huang

Wang

et al. 2023

Sustainability

View full text Add to dashboard Cite

Heavy-duty diesel engines equipped with turbochargers is an effective way to alleviate energy shortage and reduce gas emissions, but their compressor aerodynamic noise emissions have become an important issue that needs to be addressed urgently. Therefore, to study the aerodynamic noise emission characteristics of a compressor during the full operating range, experimental and numerical simulation methods were used to analyze the aerodynamic noise emissions. The results showed that aerodynamic noise’s total sound pressure level (SPL) increased with increased speed under the test conditions. At low speeds, the total SPL of aerodynamic noise was affected by the mass flow of the compressor more obviously. The maximum difference of aerodynamic noise total SPL was 1.55 dB at 60,000 r/min under different mass flows. At the same speed, the compressor could achieve lower aerodynamic noise emissions by operating in the high-efficiency region (middle mass flows). In the compressor aerodynamic noises, the blade passing frequency (BPF) noise played a dominant role. The transient acoustic-vibration spectral characteristics and fluctuation pressure analysis indicated that BPF and its harmonic frequency noises were mainly caused by the unsteady fluctuation pressure. As the speed increased, the BPF noise contributed more to the total SPL of the aerodynamic noise, and its percentage was up to 75.35%. The novelty of this study was the analysis of the relationship between compressor aerodynamic noise and internal flow characteristics at full operating conditions. It provided a theoretical basis for reducing the heavy-duty diesel engine turbocharger compressor aerodynamic noise emissions.

show abstract

Section: Introductionmentioning

confidence: 99%

Experimental and Mechanism Study of Aerodynamic Noise Emission Characteristics from a Turbocharger Compressor of Heavy-Duty Diesel Engine Based on Full Operating Range

Huang

Wang

et al. 2023

Sustainability

View full text Add to dashboard Cite

show abstract

Mechanism of Axial Compressor Tip Clearance Noise Based on Taylor–Couette Flow Rotating Instability

Joe

Kim

Hong

et al. 2022

Journal of Turbomachinery

View full text Add to dashboard Cite

Prediction of the tip clearance noise (TCN) of axial compressors is essential to accurately determine the noise level of the compressor, because it is left unattenuated during propagation. The existing studies on numerical methods are inadequate for accurate determination of the TCN owing to the limited understanding of the physical phenomenon. The most convincing explanation is that the TCN is generated because of the instability in shear waves in the tip clearance region. In this study, the rotating instability theory was developed further by modeling the physical phenomenon of the instability as a Taylor-Couette (T–C) flow. The TCN sources were obtained using T–C flow modeling, and duct noise analysis was performed to obtain the TCN at various locations and frequencies. The TCN predictions were compared with the existing experimental results and noise results obtained using FW–H. Results showed that the T–C flow modeling is sufficiently accurate for predicting the frequencies, wavenumber distributions, and SPL of the tip clearance noise of axial compressors.

show abstract

Physical Insight Into Whoosh Noise in Turbocharger Compressors Using Computational Fluid Dynamics

Dehner,

Selamet,

Sriganesh

et al. 2023

Journal of Engineering for Gas Turbines and Power

View full text Add to dashboard Cite

Whoosh is typically the primary noise concern for turbocharger centrifugal compressors without ported shroud recirculating casing treatments, utilized for spark-ignition automotive applications. Whoosh is characterized by broadband elevation of noise in approximately the 4–13 kHz range, where the lower frequency boundary is dictated by the cut-on frequency of the first multidimensional acoustic mode. At mid-to-low compressor flow rates, swirling, reversed flow emanates from the leading-edge tip region of the main impeller blades, comprising an annular zone at the inducer plane. High velocity gradients are observed near the shear layer between the bidirectional forward and reverse flow which results in the formation of rotating instability cells. Whoosh noise is generated due to the interaction of these rotating instabilities with the leading edge of main impeller blades. Along a line of constant rotational speed, whoosh noise exhibits a dome-like character, where its maximum value occurs in the mid-to-low flow region and the levels decrease at elevated and reduced mass flow rates. To provide insight into the variation of broadband whoosh noise with flowrate, this work includes experimentally validated computational fluid dynamics predictions for five mass flow rates at a fixed rotational speed. These predictions span the constant speed flow range from just below the peak efficiency to near the surge boundary. Computational predictions capture the physical mechanism responsible for the dome-like character of whoosh noise as a function of flowrate at a given rotational speed.

show abstract

Generation Mechanism of Broadband Whoosh Noise in an Automotive Turbocharger Centrifugal Compressor

Cited by 6 publications

References 16 publications

Experimental and Mechanism Study of Aerodynamic Noise Emission Characteristics from a Turbocharger Compressor of Heavy-Duty Diesel Engine Based on Full Operating Range

Experimental and Mechanism Study of Aerodynamic Noise Emission Characteristics from a Turbocharger Compressor of Heavy-Duty Diesel Engine Based on Full Operating Range

Mechanism of Axial Compressor Tip Clearance Noise Based on Taylor–Couette Flow Rotating Instability

Physical Insight Into Whoosh Noise in Turbocharger Compressors Using Computational Fluid Dynamics

Contact Info

Product

Resources

About