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Session: Poster session
Session starts: Tuesday 13 October, 13:30

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Aleksandr Sebelev (St. Petersburg State Polytechnical University)
Roland Scharf (Leibniz University Hannover)
Nikolay Zabelin (St. Petersburg State Polytechnical University)
Maksim Smirnov (St. Peterburg State Polytechnical University)

Abstract:
The problem of decreasing of fossil fuel consumption and energy efficiency is one of today’s major conceptions in the field of energy economics. Waste heat recovery is one of the promising solutions for this problem. One of the ways to increase efficiency of the waste heat recovery process is using siloxanes as working fluids for organic Rankine cycles (ORC). SPbPU scientists have analyzed peculiarities of the steady-state expansion process in the siloxane vapor driven turbine. The design of the nozzle and the blade wheel of the turbine is supersonic due to the low speed of sound of siloxanes. Initial parameters of siloxane were subcritical; a pressure ratio of the turbine was 25. Progressive steps of the initial temperature, pressure ratio and rotational velocity were used to obtain convergence of the solution process. The changings of positions of the nozzle and blade wheel critical sections were established. The details of the supersonic vortices interaction in the blade wheel flow range were analyzed. The efficiency and power output of the investigated turbine stage were estimated as 0.699 and 309.1 kW, respectively.