The current paper introduces a new concept in turbocharger development, namely, that of active turbocharger flow control. In the Active (Flow) Control Turbocharger (ACT) the nozzle is able to alter the inlet area at the throat of the turbine inlet casing in phase and at the same frequency as that of the incoming exhaust stream pulses. Actuated by an electrodynamic shaker the nozzle can adapt according to the engine exhaust gas pulse pressure variation, thus taking advantage of the lower energy levels existent before and after each pulse pressure peak, which the current systems do not take advantage of. Thus, ACT makes better use of the exhaust gas energy of the engine than a conventional VGT. The numerical simulation and experimental work concentrates on the potential gain in turbine expansion ratio and eventual power output as well as the corresponding effects on efficiency.

This content is only available via PDF.
You do not currently have access to this content.