Turbocharger Radial Turbine Response to Pulse Amplitude

Abstract Under on-engine operating conditions, a turbocharger turbine is subject to pulsating flow and, consequently, experiences deviations from the performance measured in gas-stand conditions. Furthermore, due high exhaust gases temperatures, heat transfer further deteriorates performance. The complex interaction of aerothermodynamic mechanisms occurring inside hot-side, and consequently behavior, largely affected by shape pulse, which can be parameterized through three parameters: pulse amplitude, frequency, temporal gradient. This paper investigates hot-side system response amplitude via detached eddy simulations (DES) radial including manifold. First, computational model validated against experimental data obtained Then, two different mass pulses, characterized difference ≈5%, are compared. An exergy-based post-processing approach shows beneficial effects increasing amplitude. improvement power 1.3%, despite increment total internal irreversibilities 5.8% 3.4%, respectively, reported. As result higher maximum speeds, losses caused viscous friction responsible for growth as increases.