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2 D.Maksiuta, L.Moroz, M.Burlaka, Y.Govorushenko / Energy Procedia 00 (2017) 000–000 working fluid. It is known from thermodynamics that the expansion of steam is characterized by high enthalpy drops, high volumetric flows and high volumetric ratios. Thus, a significant number of stages is needed to convert the enthalpy drop of the fluid into mechanical energy [1]. Nowadays, turbines for ORC are widely used. Organic fluids have high molecular weight which leads to significantly lower enthalpy drops. Moreover, application of a non-standard design approach which is based on non- equal enthalpy drop distribution between stages allows for the design of radial-outflow turbines with high efficiency - even higher than equal axial and radial-inflow turbines at times[2]. A schematic view of the radial-outflow turbine is shown in Fig. 1. Fig. 1. Radial-outflow turbine (schematic view) Obviously the possibility of applying ROT in organic Rankine cycle requires more detailed study. In paper [3] ORC using heat of the exhaust gases of the petrol engine CAT G3612 was proposed. It was shown that the usage of the ORC allows for achievement of an 18% power boost for the internal combustion engine without burning additional fuel. Wherein the source of generated additional power was two radial turbines. This article presents the theoretical basis of the radial-outflow turbine development. The second part of the paper is dedicated to the problem of the most optimal turbine design selection (axial, radial-inflow, radial-outflow) for its usage in the WHR organic Rankine cycle [3]. Nomenclature Symbols: c absolute velocity c0 spouting velocity D diameter H0 isentropic enthalpy drop Hu real enthalpy drop Ku circumferential velocity ratio Kz axial velocity component ratio u circumferential velocity α velocity flow angle η peripheral efficiency Indexes: 0 stage inlet parameters 1 parameters after nozzle 2 parameters after blade j index u circumferential velocity component z axial velocity componentPDF Image | radial-outflow turbine type for 3 MW WHR organic Rankine cycle
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