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ACCEPTED MANUSCRIPT Nomenclature A B b C c CL D, d ds f h H l K k m N ns o P 𝑄 Rn r S s T t U V W w 𝑊 area (m2) constant of tip clearance loss (-) axial chord (m)/tip width (m) absolute velocity (m s-1) chord length (m) lift coefficient (-) diameter (m) specific diameter (-) correction/friction coefficient’s (-) specific enthalpy (kJ/kg) blade height (m) length (m) losses coefficient (-) specific turbulence kinetic energy (m2 s-2) mass flow rate (kg s-1) number of blade (-) specific speed (-) throat (m) pressure (bar) heat (kW) reaction (-) radius (m) blade space (pitch) (m) entropy (kJ kg-1.K-1) temperature (K) time (s)/ blade thickness (m) blade velocity (m/s)/ mean flow velocity (m s-1) velocity (m/s) relative velocity (m s-1) specific work (kJ kg-1) power (kW) AS blds cr e ex f H hyd is L m nbp P p R Re S Sec sec eff sh T t th TC TE ts tt x * Acronyms 1D, 3D AFT BDA CFD EES GWP ODP ORC PD RANS RIT ROT SST aspect ratio blade critical evaporator exergy friction high hydraulic isentropic low mean normal boiling point profile pump rotor Reynolds number stator secondary second law efficiency shock total turbine/tip thermal tip clearance trailing edge total-to-static total-to-total axial tangential/circumferential direction uncorrected one and three dimensional axial flow turbine blade geometric discharge angle computational fluid dynamics Engineering Equation Solver global warming potential ozone depletion potential organic Rankine cycle preliminary mean-line design Reynolds-averaged Navier-Stokes radial-inflow turbine radial-outflow turbine shear stress transport Greek symbols α absolute flow angle (degree) β relative flow angle (degree) η efficiency (%) clearance (m) flow coefficient (-) loading coefficient (-) ω specific turbulence dissipation rate (m2 sec-3) Ω angular velocity (rad s-1) ρ density (kg m-3) τ tip clearance (m) enthalpy loss coefficient (-) Subscript/superscript 1-7 station within the turbine and cycle respectively. accel accelerating 1. Introduction Recently, with increasing concern regarding the climate change and the need for sustainable efficient power system has led to a huge attention in organic Rankine cycle (ORC) technologies. Particularly with low power output and low-temperature heat sources (<100 °C), for a small-scale system, further development is still vital to achieve efficient small-scale ORC turbines. Some ORC systems based on small-scale single and two- 2PDF Image | turbine configuration for low-power organic Rankine cycle
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