Experimental analysis of turbocharger interaction with a pulsatile flow through time-resolved flow measurements upstream and downstream the turbine

Authors: Laurantzon, F, Örlü, R., Segalini, A. S., Tillmark, N.T., Alfredsson, P.H.
Document Type: Conference
Pubstate: Published
Journal: 10th International Conference on Turbochargers and Turbocharging (iMechE), London, UK, May 15-16, 2012
Volume:    405-415
Year: 2012


The inflow to and outflow from turbochargers are highly complex and, in particular, pulsating. Nevertheless, most studies of turbocharger performance are conducted under steady conditions. Hence, there is a great interest in determining and under-standing turbocharger performance maps under pulsatile conditions. The highly complex flow field constitutes a challenge for time-resolved flow measurements by means of conventional measurement techniques. In a recent paper by Laurantzon et al [Meas. Sci. Technol. 20 123001 (2010)], time-resolved bulk flow measure-ments under pulsatile conditions have been obtained via wavelet analysis of the signal from a vortex flow meter. Here, this method has been used in order to obtain time-resolved performance maps based on the mass flow both upstream and down-stream of the turbine. The results show that the turbine has a large damping effect on the mass flow pulsations, but that the pulse shape is to a high degree preserved while passing through the turbine, and that the time-dependent filling and emptying of the turbine case make the quasi-steady assumption invalid, if the whole turbine stage is considered.