Simulations and measurements of automotive turbocharger compressor whoosh noise

Improved Performance Prediction Model for Turbocharger Compressor

In order to improve centrifugal compressor performance predictive capability, an improved recirculation loss model in two-zone modeling system is presented in this paper. The new loss model correlates Reynolds number of the impeller with the recirculation loss. Performance prediction by the improved model is carried out on two turbochargers with different sizes based on COMPAL mode of the code ...

Precision Monitoring of Automotive Compressor Capacity Values Determined From Calorimeter Measurements

In routine mobile A/C compressor testing, Secondary Refrigerant Calorimetry and the First Law of Thermodynamics are employed in the determination of calorimeter primary mass flow rate of volatile refrigerants. An energy balance is performed on the secondary refrigerant calorimeter (SRC) to yield the primary system mass flow rate. This term is the ratio of energy transferred as heat into the SRC...

Compressor Noise Control

Design of a Multi-Chamber Silencer for Turbocharger Noise

A multi-chamber silencer is designed by a computational approach to suppress the turbocharger whoosh noise downstream of a compressor in an engine intake system. Due to the significant levels and the broadband nature of the source spanning over 1.5 – 3.5 kHz, three Helmholtz resonators are implemented in series. Each resonator consists of a chamber and a number of slots, which can be modeled as...

Automotive Fuel Cell System simulation, component and compressor modelling

Future fuel cell (FC) systems for automotive applications will significantly depend on the development and realization of efficient and reliable components. The screw compressor for charging of the FC stack constitutes one important component in the system. In the European project NFCCPP (Numerical Fuel Cell Component Performance Prediction tool) within the EC 5 FP, a modular simulation environ...