Open AccessImprovement in accuracy of engine cycle simulations by using a turbocharger prediction model instead of measured efficiency map
Author(s) -
Y Misono,
Tatsuya Kuboyama,
Yasuo Moriyoshi,
Takemasa Yamada
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1909/1/012027
Subject(s) - turbocharger , extrapolation , range (aeronautics) , thermal efficiency , turbine , internal combustion engine , performance prediction , flow (mathematics) , combustion , computer science , grid , automotive engineering , simulation , engineering , mechanical engineering , mechanics , mathematics , physics , aerospace engineering , mathematical analysis , chemistry , geometry , organic chemistry
In the downsizing concept, the turbocharger (T/C) is one of the key devices for improving thermal efficiency and exhaust emissions of internal combustion engines for automobiles. In order to maximize the supercharged engine performance, the size of the T/C applied for the given engine system has been optimized by using a 1-D engine cycle simulation. For this reason, T/C performance prediction model for engine cycle simulation is required to be accurate over a wide operating range. In the conventional T/C performance prediction model, the turbine performance was predicted by extrapolating from the efficiency map measured under steady flow. However, the accuracy of the extrapolation method is uncertain, and it has been pointed out that the prediction accuracy is low in the low load operations. In this study, a 1-D T/C model developed based on hydrodynamics and thermodynamics was used. Using the 1-D T/C model, a grid efficiency map over the entire operating range was calculated and the grid map was applied to 1-D engine cycle simulation. The accuracy of the T/C model was verified by comparing the experimentally measured efficiency under steady flow.