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SMALL-SCALE RADIAL INFLOW TURBINE FOR WHR ORC

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SMALL-SCALE RADIAL INFLOW TURBINE FOR WHR ORC ( small-scale-radial-inflow-turbine-for-whr-orc )

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FIGURE 3-2 SCHEMATIC OF RADIAL INFLOW TURBINE COMPONENTS, (TOP LEFT) FRONT VIEW, (TOP RIGHT) MERIDIONAL VIEW, (BOTTOM) ENTHALPY-ENTROPY DIAGRAM OF TURBINE STAGE EXPANSION ............................................................................................................................................................... 58 FIGURE 3-3 OVERVIEW OF THE METHODOLOGY (ADOPTED AND MODIFIED FROM (JAPIKSE ET AL. 1994)) ............................................................................................................................................................... 60 FIGURE 3-4 SCHEMATIC OF MULTI-LEVEL DESIGN AND OPTIMIZATION OF RIT ................................... 61 FIGURE 3-5 FLOWCHART OF THE MEAN-LINE MODEL ADOPTED FROM (RAHBAR ET AL. 2015 [A])....... 63 FIGURE 3-6 ROTOR INLET AND EXIT VELOCITY TRIANGLES (A, B), MERIDIONAL VIEW OF THE TURBINE ROTOR WITH NOTION OF PRINCIPAL DIMENSIONS (C)............................................................................ 65 FIGURE 3-7 ALGORITHM FOR CALCULATING VELOCITY TRIANGLES AND STATIC THERMODYNAMIC PROPERTIES FOR ANY Α5 ........................................................................................................................ 68 FIGURE 3-8 SCHEMATIC OF THE NOZZLE RING WITH CORRESPONDING GEOMETRY AND VELOCITY VECTORS................................................................................................................................................ 70 FIGURE 3-9 EFFECT OF INLET TOTAL PRESSURE AND TEMPERATURE ON THE POWER, SIZE AND EFFICIENCY............................................................................................................................................ 76 FIGURE 3-10 EFFECT OF MASS FLOW RATE AND EXPANSION RATIO ON THE POWER, SIZE AND EFFICIENCY ............................................................................................................................................................... 77 FIGURE 3-11 EFFECT OF VELOCITY RATIO AND ROTATIONAL SPEED ON THE POWER, SIZE AND EFFICIENCY............................................................................................................................................ 79 FIGURE 3-12 EFFECT OF ROTOR INLET AND EXIT ABSOLUTE FLOW ANGLES ON THE POWER, SIZE AND EFFICIENCY............................................................................................................................................ 80 FIGURE 3-13 EFFECT OF ROTOR RADII RATIO ON THE POWER, SIZE AND EFFICIENCY........................... 82 FIGURE 3-14 SCHEMATIC DIAGRAM OF THE DETAILED PHASE (CFD & FEA) ...................................... 86 FIGURE 3-15 SCREEN SHOTS OF THE BLADEGEN GUI. (TOP) ROTOR, ANGLE/THICKNESS MODE, (BOTTOM) NOZZLE, PRESSURE/SUCTION MODE ..................................................................................... 87 FIGURE 3-16 COMPUTATIONAL FLUID DOMAINS FOR NOZZLE AND ROTOR .......................................... 89 FIGURE 3-17 SELECTED GRID SIZE FOR THE NOZZLE AND ROTOR BLADE PASSAGES ............................ 91 FIGURE 3-18 BLADE ANGLE DISTRIBUTION AT HALF SPAN FOR 4 DIFFERENT BLADE PROFILES ........... 92 FIGURE 3-19 THE POSITION OF THE SPANS ACROSS THE MERIDIONAL CHANNEL FOR PRESENTATION OF RESULTS................................................................................................................................................. 93 FIGURE 3-20 VELOCITY VECTORS AT HALF SPAN FOR THE BLADE PROFILE “A” .................................. 94 FIGURE 3-21 VELOCITY VECTORS AT HALF SPAN FOR THE BLADE PROFILE “B” .................................. 94 FIGURE 3-22 VELOCITY VECTORS AT HALF SPAN FOR THE BLADE PROFILE “C” .................................. 95 FIGURE 3-23 VELOCITY VECTORS AT HALF SPAN FOR THE BLADE PROFILE “D” .................................. 95 FIGURE 3-24 CONTOURS OF ENTROPY DISTRIBUTION AT HALF SPAN FOR THE BLADE PROFILE “A” .... 97 X

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