Turbocharger Centrifugal Compressor Casing Treatment for Improved BPF Noise Using Computational Fluid Dynamics

Karim, Ahsanul; Mckean, Matthew; Dehner, Rick; Selamet, Ahmet; Tiernan, Chris; Morelli, Anthony; Miazgowicz, Keith; Mull, Ted

doi:10.4271/2019-01-1484

Cited by 2 publications

(1 citation statement)

References 21 publications

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“…With respect to the movement of the rotor, several strategies are found in the literature and they can be divided in a transient configuration, known as rigid body motion (RBM) [31,32], and a steady configuration with a moving reference frame (MRF). This one, in turn, is divided in two possible options: a frozen rotor [33] or a mixing plane (MP) [34].…”

Section: Compressormentioning

confidence: 99%

Methodology for a Numerical Multidimensional Optimization of a Mixer Coupled to a Compressor for Its Integrationin a Hyperloop Vehicle

et al. 2022

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The current environmental concern has led both the industry and researchers to look for alternate means of transport. Amongst them, the hyperloop has become a quite promising idea. In order to overcome some of its limitations, including a compressor in its propulsive system has been investigated. In this paper, a strategy to improve the design of the mixer, which will blend the bypass and core streams coming out of the compressor, was addressed. Due to the lack of ad hoc compressors and the impossibility of experimental testing, a multidimensional optimization methodology with CFD tools was developed. A Taguchi DOE was employed for a preliminary 2D optimization from an initial geometry, whereas a numerical adjoint method was explored for the whole 3D mixer. By using this method, an initial decrease in the pressure drop of 16% was obtained with the 2D stage, whereas an additional 10% reduction was achieved in the 3D optimization. With this, the propulsive efficiency of the whole hyperloop system will be improved.

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Section: Compressormentioning

confidence: 99%

Methodology for a Numerical Multidimensional Optimization of a Mixer Coupled to a Compressor for Its Integrationin a Hyperloop Vehicle

et al. 2022

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An Experimental Investigation of the Acoustic Performance of a High-Frequency Silencer for Turbocharger Compressors

Sriganesh¹,

Selamet²

2023

SAE Technical Paper Series

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<div class="section abstract"><div class="htmlview paragraph">Conventional silencers have extensively been used to attenuate airborne pressure pulsations in the breathing system of internal combustion engines, typically at low frequencies as dictated by the crankshaft speed. With the introduction of turbocharger compressors, however, particularly those with the ported shroud recirculating casing treatment, high-frequency tones on the order of 10 kHz have become a significant contributor to noise in the induction system. The elevated frequencies promote multi-dimensional wave propagation, rendering traditional silencing design methods invalid, as well as the standard techniques to assess silencer performance. The present study features a novel high-frequency silencer designed to target blade-pass frequency (BPF) noise at the inlet of turbocharger compressors. The concept uses an acoustic straightener to promote planar wave propagation across arrays of quarter-wave resonators, achieving a broadband attenuation. The effectiveness of the silencer is evaluated on a turbocharger gas stand where the compressor is the noise source. The experiment utilizes a unique rotating inlet duct upstream of the silencer to perform a modal decomposition of the acoustic field in order to compute sound power levels across the operating flow range at various compressor rotational speeds. The results are then compared to those from an earlier experiment with a straight duct installed at the compressor inlet to determine silencer insertion loss, defined here as the difference between upstream (with respect to flow direction) sound power levels without and with the silencer. The study also addresses the resulting compromise in compression system performance and noise generated due to flow-acoustic coupling within the silencer. Hence, the current effort demonstrates the effectiveness of a novel silencer in terms of insertion loss derived from a modal decomposition of the multi-dimensional acoustic field at the compressor inlet.</div></div>

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Turbocharger Centrifugal Compressor Casing Treatment for Improved BPF Noise Using Computational Fluid Dynamics

Cited by 2 publications

References 21 publications

Methodology for a Numerical Multidimensional Optimization of a Mixer Coupled to a Compressor for Its Integrationin a Hyperloop Vehicle

Methodology for a Numerical Multidimensional Optimization of a Mixer Coupled to a Compressor for Its Integrationin a Hyperloop Vehicle

An Experimental Investigation of the Acoustic Performance of a High-Frequency Silencer for Turbocharger Compressors

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