Abstract
Over the past few decades, the aerodynamic improvements of turbocharger turbines contributed significantly to the overall efficiency augmentation and the advancements in downsizing of internal combustion engines. Due to the compact size of automotive turbochargers, the experimental measurement of the complex internal aerodynamics has been insufficiently studied. Hence, turbine designs mostly rely on the results of numerical simulations and the validation of zero-dimensional parameters as efficiency and reduced mass flow. To push the aerodynamic development even further, a precise validation of three-dimensional flow patterns predicted by applied computational fluid dynamics (CFD) methods is in need. This paper presents the design of an up-scaled volute-stator model, which allows optical experimental measurement techniques. In a preliminary step, numerical results indicate that the enlarged geometry will be representative of the flow patterns and characteristic non-dimensional numbers at defined flow sections of the real size turbine. Limitations due to rotor-stator interactions are highlighted. Measurement sections of interest for available measurement techniques are predefined.
Highlights
European standards on pollution emissions regulate the acceptable limits for exhaust emissions of newly purchased vehicles with internal combustion engines in the European Union
This work showed a methodology developed to validate the application of a new tool on the fluid surface, as demonstrated by several authors, among which the work carried out on the structure that behavior study in the inside of very small radial turbines used in automotive gasoline, diesel, or hybrid acquires the flow inside the boundary layer can be highlighted [90]
The obtained results in both modeled turbines demonstrated that there was an interaction between the stator and the rotor, which could not be replicated by the scaled model
Summary
The information of the flow behavior is important to feed mathematical models that do not require a great computational capacity as 1D models [18] These models are used to simulate the supercharging system in the engine. There are few works dedicated to the experimental measurement of internal flow in small-sized centripetal turbines [22,23,24], such as those used in automotive supercharging systems. This work is focused on characterizing the internal flow of a larger scale turbine volute and stator. The limitations for the validity of the scaled model and recommendations for measurements to characterize the flow of the presented and future geometries are given
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