Abstract
Modern pressure-wave supercharging devices offer many degrees of freedom in operation with an internal combustion engine. Both the independent set of wave rotor speed and the offset between air and gas casing can guarantee optimum efficiency even under problematic operating conditions. However, these systems require very accurate models that can reproduce the physical effects occurring in the charger. In this paper, a finite difference tool is presented where a set of Euler-type partial differential equations is numerically solved to simulate the 1-dimensional unsteady gas dynamics in the cell wheel, taking into account such phenomena as leakage, heat transfer, and friction. In order to show its general applicability, the model was validated with measurement results from two different PWS-boosted engines on a test rig.
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