Turbocharger Thermal Transfer Model Initialization: Quasi-Adiabatic Map Calculation 2019-24-0232
To comply with the evermore stringent polluting emission regulation, such as Euro 6c and its new homologation WTLP cycle, the use of turbocharger has been widely adopted amongst modern IC Engines, either in Diesel or Gasoline ones. It has also leaded to a large variety of implementation as single / two stage(s) or even parallel functioning. In the meantime, car manufacturer intend to decrease development cost and time by using more and more simulation over experimental measurements. However usual turbocharger model have not followed this trend of modernity and are still map based from turbocharger manufacturer data.
While the heating part of the standard cycle becomes a major issue and simulation accuracy is the keystone of the new development strategies , turbocharger models have not followed this trend of modernity. They are still map based from turbocharger manufacturer data, measured in hot conditions, as this is usually the only available entry data. To improve their accuracy, new turbocharger model needs to take into account the thermal transfer. Different models have been offered to solve this problem but requires specific data for calibration. This is hardly compatible with the industry habits.
Using a turbocharger model with thermal transfer, this paper presents a methodology to evaluate quasi-adiabatic turbine and compressor maps from the standard turbocharger ones and geometrical data. Furthermore, to comply with the industry constraints, two calibration level are proposed, depending on which geometrical are data available. In order to test this methodology, an implementation in the commercial software Simcenter Amesim™ software has been done. Finally, a validation against experimental measurements is conducted for different turbochargers of various sizes.
Guillaume Goumy, Pierre Marty, Pascal Chesse, Nicolas Perrot, Rémi Dubouil, Georges Salameh