Turbocharger turbine rotor tip leakage loss and mass flow model valid up to extreme off-design conditions with high blade to jet speed ratio

JR Serrano, R Navarro, LM García-Cuevas… - Energy, 2018 - Elsevier
Due to the power consumption restriction of the turbocharger compressor, common turbine
maps are rather narrow. To extrapolate them, reliable physical submodels are needed that …

An innovative losses model for efficiency map fitting of vaneless and variable vaned radial turbines extrapolating towards extreme off-design conditions

JR Serrano, FJ Arnau, LM García-Cuevas, LB Inhestern - Energy, 2019 - Elsevier
Pulsating flow in automotive turbocharger turbines makes it necessary to know performance
characteristics in difficult to measure off-design conditions. Physically based extrapolation …

Contribution to tip leakage loss modeling in radial turbines based on 3D flow analysis and 1D characterization

JR Serrano, R Navarro, LM García-Cuevas… - International Journal of …, 2019 - Elsevier
The characterization of tip leakage flow plays an important role for one-dimensional loss
modeling and design in radial turbine research. Tip leakage losses can be expressed as …

Numerical evaluation in a scaled rotor-less nozzle vaned radial turbine model under variable geometry conditions

JR Serrano, AO Tiseira, JA López-Carrillo… - Applied Sciences, 2022 - mdpi.com
The widespread trend of pursuing higher efficiencies in radial turbochargers led to the
prompting of this work. A 3D-printed model of the static parts of a radial variable geometry …

[HTML][HTML] Choking dynamic of highly swirled flow in variable nozzle radial turbines

A Tiseira, V Dolz, LB Inhestern… - Aerospace Science and …, 2022 - Elsevier
This paper presents the results of a computational investigation of the aerodynamic choking
mechanism in a variable geometry turbine, which is widely used in automotive …

Numerical analysis of the effects of different rotor tip gaps in a radial turbine operating at high pressure ratios reaching choked flow

J Galindo, A Tiseira, R Navarro, LB Inhestern… - Energies, 2022 - mdpi.com
To operate, radial turbines used in turbochargers require a minimum tip gap between the
rotor blades and the stationary wall casing (shroud). This gap generates leakage flow driven …

Development of choked flow in variable nozzle radial turbines

A Tiseira, LM García-Cuevas… - … Journal of Engine …, 2022 - journals.sagepub.com
In commonly applied one-dimensional choking models for radial turbines, choked flow is
assumed to appear in the geometrical throat of each stator and rotor. Coupled and complex …

Design and numerical analysis of flow characteristics in a scaled volute and vaned nozzle of radial turbocharger turbines

AO Tiseira Izaguirre, R Navarro García, LB Inhestern… - Energies, 2020 - mdpi.com
Over the past few decades, the aerodynamic improvements of turbocharger turbines
contributed significantly to the overall efficiency augmentation and the advancements in …

Numerical Analysis of the Effects of Grooved Stator Vanes in a Radial Turbine Operating at High Pressure Ratios Reaching Choked Flow

J Galindo, A Tiseira, R Navarro, LB Inhestern… - Aerospace, 2023 - mdpi.com
The flow through the stator vanes of a variable geometry turbocharger turbine can reach
supersonic conditions and generates a shock wave on the stator vanes, which has a …

Numerical Simulation of a Radial Turbine at Off-Design Conditions in Presence of Choked Flow

A Tiseira, LM García-Cuevas… - … Expo: Power for …, 2020 - asmedigitalcollection.asme.org
In the application of turbocharging and organic Rankine cycles (ORCs) the radial turbine
can operate at high pressure ratio leading to the presence of choking inside the turbine …