CONTACT US
THERMAL ENERGY SYSTEMS LAB
School of Mechanical and Aerospace Engineering
Nanyang Technological University / Materials Lab 1 / Block N3.1 - B2b - 02
50 Nanyang Avenue, 639798 Singapore
For enquiries please contact:
Asst. Prof. Alessandro Romagnoli
email: a.romagnoli@ntu.edu.sg
CONTACT US
THERMAL ENERGY SYSTEMS LAB
School of Mechanical and Aerospace Engineering
Nanyang Technological University / Materials Lab 1 / Block N3.1 - B2b - 02
50 Nanyang Avenue, 639798 Singapore
For enquiries please contact:
Asst. Prof. Alessandro Romagnoli
email: a.romagnoli@ntu.edu.sg
Mission: In our lab we aim to improve energy efficiency through design and optimization of thermal systems
Activity: our work explores a number of thematic ideas that challenges the energy research area
CONTACT US
THERMAL ENERGY SYSTEMS LAB
School of Mechanical and Aerospace Engineering
Nanyang Technological University / Materials Lab 1 / Block N3.1 - B2b - 02
50 Nanyang Avenue, 639798 Singapore
For enquiries please contact:
Asst. Prof. Alessandro Romagnoli
email: a.romagnoli@ntu.edu.sg
CONTACT US
THERMAL ENERGY SYSTEMS LAB
School of Mechanical and Aerospace Engineering
Nanyang Technological University / Materials Lab 1 / Block N3.1 - B2b - 02
50 Nanyang Avenue, 639798 Singapore
For enquiries please contact:
Asst. Prof. Alessandro Romagnoli
email: a.romagnoli@ntu.edu.sg
Dr. Jia Yin Sze - Research Fellow
Dr. Jia Yin Sze - Research Fellow
Dr. Jia Yin Sze - Research Fellow
CONTACT US
THERMAL ENERGY SYSTEMS LAB
School of Mechanical and Aerospace Engineering
Nanyang Technological University / Materials Lab 1 / Block N3.1 - B2b - 02
50 Nanyang Avenue, 639798 Singapore
For enquiries please contact:
Asst. Prof. Alessandro Romagnoli
email: a.romagnoli@ntu.edu.sg



Our group: a multi-disciplinary team which contributes to push boundaries and deliver high impact research output
Activity: our work explores a number of thematic ideas that challenges the energy research area

Multi-injection Turbine Housing
Supported by: CARES C4T, 2018-2023
Researchers from NTU
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Assoc. Prof. Alessandro Romagnoli, PI
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Dr. Zheng Liu, Research Fellow
University of Cambridge
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Prof. Epaminondas Mastorakos, Project Coordinator for CARES C4T
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Prof. Markus Kraft, Programme Director for CARES C4T
Collaborators
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Prof. Srithar Rajoo, Director of the Low Carbon Research Centre in Collaboration with Imperial College London
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Dr. Torsten Palenschat, R&D Engineer at Daimler
Description of the project
This research seeks to improve the turbine performance by injecting the secondary flow through an injector over the shroud section. A secondary flow injection system has been developed to fit for an asymmetric twin-scroll turbocharger turbine, designed for a 6-cylinder heavy-duty diesel engine, aiming at reducing the brake specific fuel consumption at 1100 rpm under full-loading conditions. The shape of the flow injector is similar to a single-entry volute but can produce the flow angle in both circumferential and meridional directions, when the flow leaves the injector and enters the shroud.
In order to find the optimal injector design that maximizes the turbine performances, ten design parameters have been considered, which control circumferential area distributions, exit flow angles, and flow velocities. The source for the flow injection can be either from the engine exhaust flow or an external compressor. With the flow injection, the blade loading is significantly improved downstream to the location where the flow is injected. The lower pressure of the blade’s suction side is the main reason that leads to the improvement of performance.
The secondary flow can effectively reduce the vortex separation on the suction side and reduce associated losses. A secondary flow injection system can be integrated into a conventional turbine without affecting its original design parameters, including the rotor, volute, and back disk. Therefore, the swallowing capacity and thrust loading characteristics are kept the same as the original turbine, thereby maintaining the same turbocharger-engine matching and turbine-compressor matching.

