S CO2 Radial Turbine Design as a Function of Turbine Size

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S CO2 Radial Turbine Design as a Function of Turbine Size ( s-co2-radial-turbine-design-as-function-turbine-size )

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Case no. A B1a 0.28 0.82 0.29 200 113 71.15 􏰐32.74 􏰐55.96 28.55 8.57 14.38 1.33 5.81 78.60 2.13 293.12 112.60 338.29 94.72 169.19 101.49 6.706 B2 C 0.32 0.21 0.81 0.88 0.30 0.20 200 100 113 120 68.44 76.58 􏰐30.70 􏰐29.75 􏰐51.85 􏰐61.87 28.25 26.54 8.48 7.96 13.90 12.41 1.23 0.94 5.42 4.45 76.01 82.03 2.20 1.02 291.51 301.76 124.57 80.67 334.72 333.55 107.11 70.04 173.40 148.57 100.42 100.06 7.459 4.594 Table 3 Details for four turbine designs Comparison of the different designs shows that tip clearance losses are similar for all the designs, but that passage, exit energy, and incident losses are increased and decreased for designs B2 and C, respectively, resulting in the overall efficiency trends. Sections 3.5.1 to 3.5.8 review the primary losses in detail to demonstrate their accuracy for sCO2 and to elucidate the cause of the losses and how they can be reduced. 3.5.1 Passage Loss. The passage loss is calculated using the Concept ETI (CETI) model presented in Moustapha et al. [14] Fig. 11 Turbine profiles for three turbine cases u 0.28 w 0.82 Ns 0.29 Wout (kW) N (kRPM) a4 (deg) b4 (deg) b6rms (deg) r4 (mm) r6h (mm) r (mm) 6t b4 (mm) b6 (mm) gts (%) m_ ðkgs􏰐1Þ C4 (m s􏰐1) W4 (m s􏰐1) U4 (m s􏰐1) C6 (m s􏰐1) W6rms (m s􏰐1) U6h (m s􏰐1) Rer (􏰔 106) aNonfeasible. 100 160 71.15 􏰐32.74 􏰐56.53 20.15 6.05 10.44 0.97 4.40 78.25 1.07 292.48 112.36 337.55 94.51 171.37 101.26 4.637 23 􏰕􏰖 􏰕􏰖2!! 4L r􏶥b5 r4 b5=ct ð12Þ Dh 1⁄40:11m h þ0:68 1􏰐 5 b;5 passage f Dh W2 þW2 􏰔4 6rms 2 here mf 1⁄4 1.0 for ðr4 􏰐 r5t=b5Þ 􏰘 0:2 and mf 1⁄4 2.0 otherwise, and r􏶥5 is the mean radius for the throat in the rotor passage. 3.5.2 Exit Energy Loss. The exit energy loss (Dhexit) corre- sponds to the kinetic energy exiting the rotor, which is calculated as Fig. 12 081008-8 / Vol.139,AUGUST2017 Turbine losses decomposition for three turbine cases TransactionsoftheASME Downloaded From: http://turbomachinery.asmedigitalcollection.asme.org/pdfaccess.ashx?url=/data/journals/jotuei/936123/ on 04/05/2017 Terms of Use: http://www.asme.org/a b

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