Through-Flow Modeling For Gasoline Engine Turbo System Matching

Nowadays due to public opinion pressure and governments awareness of environment protection issue, the regulations implemented become more and more stringent. To improve the engine performance, turbocharger has become a critical component to design and should be well modeled. By controlling turbocharger operating conditions, it is now possible to associate turbochargers with gasoline engines. The traditional way to model the engine turbocharger is to use the MAP method. By interpolating and extrapolating experimental data, turbocharger performance maps can be generated.To model an engine using the VGT technology, compressor and turbine performance maps are necessary for each nozzle blades position. Using the traditional map generation method implies to collect experimental data for each nozzle blades position which is very expensive. The same problem occurs when studying Two Stages Turbocharging Systems.Because the traditional MAP method has obvious disadvantages, a new advanced map generation method based on the through flow theory has been developed. This theory which is already commonly used to develop axial compressors and turbines for aeronautical applications was applied to automotive radial turbocharger development. This advanced map generation method was validated against experimental data to show that it has a satisfactory accuracy. A further work has been done to couple directly GT-Power (engine model) and Concepts NREC (turbocharger model).