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 3-25 CONTOURS OF ENTROPY DISTRIBUTION AT HALF SPAN FOR THE BLADE PROFILE “B” .... 97 FIGURE 3-26 CONTOURS OF ENTROPY DISTRIBUTION AT HALF SPAN FOR THE BLADE PROFILE “C” .... 98 FIGURE 3-27 CONTOURS OF ENTROPY DISTRIBUTION AT HALF SPAN FOR THE BLADE PROFILE “D” .... 98 FIGURE 3-28 VARIATION OF HUB-TO-TIP BLADE THICKNESS (A) ORIGINAL THICKNESS, (B) MODIFIED THICKNESS........................................................................................................................................... 100 FIGURE 3-29 BLADE-TO-BLADE VIEW OF THE ORIGINAL AND MODIFIED THICKNESSES AND LE SHAPES AT HALF SPAN ...................................................................................................................................... 100 FIGURE 3-30 VELOCITY STREAMLINES AT HALF SPAN (A) ORIGINAL LE – SQUARE CUT-OFF (B) MODIFIED LE – ELLIPTICAL CURVE .................................................................................................... 102 FIGURE 3-31 ABSOLUTE FLOW VELOCITY AT THE ROTOR OUTLET FOR THE ORIGINAL AND MODIFIED PROFILE "D” ........................................................................................................................................ 103 FIGURE 3-32 BLADE LOADING (LEFT) AND MACH NUMBER (RIGHT) FOR ZROTOR =11........................... 104 FIGURE 3-33 BLADE LOADING (LEFT) AND MACH NUMBER (RIGHT) FOR ZROTOR =13........................... 104 FIGURE 3-34 BLADE LOADING (LEFT) AND MACH NUMBER (RIGHT) FOR ZROTOR =15 .......................... 104 FIGURE 3-35 BLADE LOADING (LEFT) AND MACH NUMBER (RIGHT) FOR ZROTOR =16 .......................... 105 FIGURE 3-36 MERIDIONAL PRESSURE (LEFT), MACH NUMBER (MIDDLE) AND ENTROPY (RIGHT) DISTRIBUTION CONTOUR PLOTS .......................................................................................................... 106 FIGURE 3-37 3-D VELOCITY STREAMLINES WITHIN NOZZLE AND ROTOR PASSAGES .......................... 107 FIGURE 3-38 FINAL 3-D GEOMETRY OF THE ROTOR AND NOZZLE ...................................................... 107 FIGURE 3-39 CASING 1 WITH PERPENDICULAR INLET AND INTERNAL BAFFLES .................................. 109 FIGURE 3-40 CASING 2 WITH SIDE INLET ............................................................................................. 109 FIGURE 3-41 MESH FOR CASING 1 (LEFT), CASING 2 (RIGHT) ............................................................. 110 FIGURE 3-42 CFD SETUP OF THE COMPLETE TURBINE STAGE WITH CASING 1.................................... 111 FIGURE 3-43 CFD SETUP OF THE COMPLETE TURBINE STAGE WITH CASING 2.................................... 111 FIGURE 3-44 NOZZLE BLADE LOADING OBTAINED FROM THE COMPLETE STAGE CFD ANALYSIS ..... 112 FIGURE 3-45 VELOCITY STREAMLINES FOR COMPLETE TURBINE STAGE (TOP) WITH CASING 1, (BOTTOM) WITH CASING 2 .................................................................................................................................... 113 FIGURE 3-46 CONTOURS OF ENTROPY DISTRIBUTION IN BLADE-TO-BLADE VIEW AT HALF SPAN, (LEFT) WITH CASING 1, (RIGHT) WITH CASING 2 ............................................................................................ 114 FIGURE 3-47 SPECIFIED BOUNDARY CONDITIONS FOR THE FEA, (TOP) FIXED SUPPORT, (MIDDLE) IMPORTED PRESSURE FROM CFD SIMULATION, (BOTTOM) ROTATIONAL SPEED AND AXIS OF ROTATION ............................................................................................................................................................. 116 FIGURE 3-48 FEA TETRAHEDRON MESH, (LEFT) COARSE MESH, (MIDDLE) MEDIUM MESH, (RIGHT) FINE MESH.................................................................................................................................................... 117 XI

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