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Session: Complex and rotating flows
Session starts: Wednesday 05 November, 11:40
Presentation starts: 12:00
Room: Commission roon 2

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Kosuke Wakimizu (Shizuoka University)
Mitsuhiro Fukuta (Shizuoka University)
Masaaki Motozawa (Shizuoka University)

Abstract:
The application of Tesla turbine to refrigeration cycles as an expansion device has a possibility to enhance the energy efficiency. Since Tesla turbine has a simple structure, there are many advantages such as low cost, high reliability, and operation without lubrication. Although these features make the turbine suitable for integration into the refrigeration cycle, its operation with two-phase flow during expansion process has been unclear yet. This study aims to investigate the basic performance of Tesla turbine and its applicability to two-phase conditions. The basic performance was evaluated using air as the working fluid. To assess its adaptability to two-phase flow, internal flow behavior in the turbine was visualized. As a result, the maximum output and efficiency under single-phase flow conditions were found to be approximately 16.0 W and 7.5%, respectively. In the visualization experiment under two-phase flow, water was observed to accumulate near the outer periphery of the turbine and rotate along the edge of the disks. Comparing with single-phase operation, the rotational speed decreased.