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Multi-objective Optimization of a Variable Geometry Turbocharger (VGT)

Advanced Design Technology was asked by a leading automotive manufacturer to use TURBOdesign Suite to optimize their turbine stage efficiency at four different operating conditions.

ADT used 3D Inverse Design code TURBOdesign1 and its integration with Ansys to provide a final optimized design with a clear improvement in total efficiency compared to the already highly optimized baseline design.

VGT-featured-image-3 

Design Target

To optimize turbine nozzle and rotor blades in order to maximize the turbine stage efficiency at four different operating conditions with different nozzle setting angles. It was also necessary to maintain or improve the Moment of Inertia (MoI), maximum stress and vibration frequencies (first and second mode).

 

Deliverables

Final optimized nozzle and rotor blade geometries which meet the client's design targets.

A response surface model (RSM), built using Kriging, based on the design matrix obtained from a number of Design of Experiment (DoE), CFD and FEA calculations that can be used to quickly perform optimization using different constraints and objectives.

 

Impact

CFD results showed that the final optimized design provided a 1.2 percentage point improvement in total efficiency, which is defined using different weighing factors at the four different operating conditions. The results showed a 6.6% lower MoI, 2.1% lower blade stress, 8% lower backplate stress, same first mode frequency and 4% lower second mode frequency compared to the baseline, which was already a highly optimized design.

VGT-Fig-3-comparison

The design process presented in the consultancy summary is applicable to all types of turbines and turbomachinery designs where complex multi-disciplinary, multi-objective and multi-point operations are required.

 

Download the Consultancy Summary
 
 
About Advanced Design Technology

We provide software and services for the design and optimization of turbomachinery, based on our unique 3D Inverse Design technology. Our tools and services help customers achieve innovative “breakthrough” designs, delivering market leading solutions at dramatically reduced development costs.

ADT, headquartered in London, UK, was established in 1999 as a joint venture between University College London and The Ebara Research Co Limited of Japan. We are considered as one of the leading global turbomachinery design software providers, with our TURBOdesign Suite tool set in use across a very wide range of applications and sectors. 

Our design consultancy services deliver cutting-edge solutions to our global customers. Whether the task involves a complete solution, from concept to final design for manufacturing, or is facing challenging multi-point / multi-objective design optimization, we work closely with our customers and support them throughout the entire design process.

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