Browse Publications Technical Papers 2018-01-1527
2018-06-13

Influence of Compressor Recirculation Valve and Piping Design on the Acoustic Response of an Automotive Turbocharger 2018-01-1527

Turbochargers are nowadays, with the emerging technology of downsized combustion engines, an essential part of automotive engines. The demand of full boost pressure at low engine speeds while avoiding over boosting at high engine speeds constitutes boost pressure control systems such as multi-stage boosting systems (e.g. Regulated Two-Stage System) an important part of turbocharged engines. These systems contain integrated controlling valves in order to function correctly. A good example for the regulating feature in Regulated Two-Stage System (R2S) systems is an integrated recirculation valve in the compressor housing (CRV). This comes with various NVH issues, since the recirculation process and the piping of such valves can be the root cause of such acoustic problems. The aim of this paper is to conduct an acoustical comparison between three different CRV designs as a part of centrifugal compressor stage. Aim is to find a compromise in terms of aero-acoustics and performance. The method used is in this paper is a hybrid Computational Aero Acoustics calculation (CAA) consisting of Unsteady Reynolds Averaged Navier Stokes (URANS) accompanied by the acoustic evaluation. Firstly, the fluid dynamical behavior of the compressor stage containing CRV is calculated with the help of Computational Fluid Dynamics (CFD) followed by calculating the noise sources on the basis of acoustic analogies. Additional investigations are conducted based on the system’s cavity resonances that could aggravate the associated acoustics. The simulation results reveal a clear acoustical dependency of the CRV volume and the shape of the connecting pipes. There is a specific design tendency for both the CRV chamber volume and the piping depicting a positive acoustic response. This tendency relays on the functionality of the recirculation in the compressor stage, which helps to regulate the pressure ratio. These patterns are also identified and confirmed by measurements.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
TECHNICAL PAPER

Unsteady Performance Simulation Analysis of a Waste-Gated Turbocharger Turbine under Different Valve Opening Conditions

2017-01-2417

View Details

JOURNAL ARTICLE

Simulation of Mild Surge in a Turbocharger Compression System

2010-01-2142

View Details

TECHNICAL PAPER

Variable Inlet Guide Vanes in a Turbocharger Centrifugal Compressor: Local and Global Study

2008-01-0301

View Details

X