Experimental Investigation of Twin Scroll Turbocharger Performance Under Pulsating Conditions

The pulsating nature of automotive internal combustion engines (ICE) is one of the main challenges in the modeling of turbochargers in process simulation. Radial compressors and turbines are characterized by maps containing parameters such as wheel speed, mass flow rate, temperatures and pressure ratios. Those parameters are obtained by standardized test bench measurements, which require stationary flow conditions. In this paper an advanced experimental setup is introduced to investigate the turbine behavior under pulsating conditions. Pressure, temperature, mass flow and turbine torque are measured with an equivalent to a resolution of 0.1 degrees camshaft rotation to obtain working cycle resolved parameters. This way, the turbine performance can be evaluated under pulsating conditions.