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20 mins
A revised TESLA turbine concept for ORC applications
Giampaolo Manfrida, Leonardo Pacini, Lorenzo Talluri
Session: Session 3C: Turbomachinery (1)
Session starts: Wednesday 13 September, 16:30
Presentation starts: 16:50
Room: Building 27 - Lecture room 03

Giampaolo Manfrida (Università degli Studi di Firenze)
Leonardo Pacini (Università degli Studi di Firenze)
Lorenzo Talluri (Università degli Studi di Firenze)

The TESLA turbine is an original expander working on the principle of torque transmission by wall shear stress. The principle – demonstrated for air expanders at lab scale, and developed at commercial level as a pump - has some attractive features when applied to ORC expanders: it is suitable for handling limited flow rates (as is the case for machines in the range from 500W to 5 kW), it can be developed to a reasonable size (rotor of 0,1 to 0,3 m diameters), and with possible rotational speeds (from 1000 to 8000 rpm). The original concept has been revisited, improving the stator layout (which is typically responsible for a poor performance) and developing a modular design philosophy allowing to cover a wide power range, and a perfectly sealed operation, as well as other fluid dynamics improvements. The flow model was developed using complete real fluid assumptions, and includes several new concepts such as bladed channels for the stator and rotor disk profiling, and detailed treatment of losses. Detailed design sketches are presented and preliminary results discussed and evaluated.