Two-phase flow expansion: development of an innovative test-rig for flow characterisation and CFD validation

Traverso, Alberto; Reggio, Federico; Silvestri, Paolo; Rizzo, Sergio; Engelbrecht, Geoff; Chasoglou, Alexandros

doi:10.1051/e3sconf/201911303017

Cited by 2 publications

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References 5 publications

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“…In the last year, a few research papers have been published, reporting the development of an innovative test rig for the characterization of the flow within a 2phase Tesla turbine [16], the possible benefits of utilizing a Tesla turbine instead of an expansion valve within a high-efficiency HVAC system [17], or for the energy harvesting when replacing the expansion valves in high-pressure natural gas pipelines [18,19].…”

Section: Tesla Turbinementioning

confidence: 99%

A revised Tesla Turbine concept for 2-phase applications

et al. 2021

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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 has some attractive features when applied to two-phase 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 0.25 m diameters), with acceptable rotational speeds (which range from 500 to 10000 rpm). The original concept was revisited, designing it for two-phase operation and considering not only the rotor configuration but the whole machine. The flow model was developed using complete real fluid assumptions including several new concepts such as bladed channels for the stator, labyrinth seals, and a rotating diffuser. Preliminary design sketches are presented, and results discussed and evaluated.

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