Improvement of Turbocharger Aeroacoustic Performance When Opening Wastegate

Abstract

AbstractThe paper addresses the results of calculation studies of turbocharger aeroacoustic performance when opening the wastegate. The modern methods of computational aeroacoustics (CAA) are considered, allowing reduction of the noise level and including the turbocharger, when the wastegate is opened. The finite element model of the internal volume of the wastegate with the turbocharger “cold” end was developed. The hybrid approach with Mohring's analogy was chosen for the aeroacoustic noise calculation when opening the turbocharger wastegate. The aeroacoustic noise of the turbocharger when opening the wastegate was calculated, and the noise source density areas were localized according to Mohring. Experimental validation of the calculation was performed on the engine and vehicle test bench. Parametric optimization was performed in order to reduce the noise when opening the turbocharger wastegate. Aeroacoustic noise reduction when opening the turbocharger wastegate was confirmed experimentally on the engine test bench and within the road tests. Based on the results of the optimization research, the 5 dBA reduction in the noise of the turbocharger at opening was registered.KeywordsComputational aeroacousticsTurbocharger noiseFinite element modelingAeroacoustic noise calculationMohring's analogyExperimental validation of calculationParametric optimizationEngine testsRoad tests