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Technical Paper

Development and Application of a Quasi-3D Model for the Simulation of Radial Compressors of Turbochargers for Internal Combustion Engines

2019-09-09
2019-24-0187
Although the characterization of turbochargers group has been historically performed by means of experimental analysis, the development of processors and software, together with the necessity of reducing the prototyping costs, has lead computational fluid-dynamic to be a possible alternative for determining the engine-turbo matching without resorting to detailed maps. In this work 3Dcell method, a quasi3D approach, developed by the Internal Combustion Engine Group at Politecnico di Milano, has been customized and applied to for the fluid dynamic simulation of fluid machines with rotating components (compressor impellers or turbine rotors). The 3Dcell is based on a pseudo-staggered leapfrog method applied to the governing equation to a 1D problem arbitrarily oriented in space. As mention above, 3Dcell has been developed for acoustic simulation for simple and motionless geometries.
Technical Paper

Direct Evaluation of Turbine Isentropic Efficiency in Turbochargers: CFD Assisted Design of an Innovative Measuring Technique

2019-04-02
2019-01-0324
Turbocharging is playing today a fundamental role not only to improve automotive engine performance, but also to reduce fuel consumption and exhaust emissions for both Spark Ignition and Diesel engines. Dedicated experimental investigations on turbochargers are therefore necessary to assess a better understanding of its performance. The availability of experimental information on turbocharger steady flow performance is an essential requirement to optimize the engine-turbocharger matching, which is usually achieved by means of simulation models. This aspect is even more important when referred to the turbine efficiency, since its swallowing capacity can be accurately evaluated through the measurement of mass flow rate, inlet temperature and pressure ratio across the machine.
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