Fluid Mechanics and Thermodynamics of Turbomachinery, 5e

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Thus, the total-to-static efficiency is Radial Flow Gas Turbines 255 The actual specific work output to the shaft, after allowing for the bearing friction loss, is Thus, the turbine overall total-to-static efficiency is h0 = D Wact ( h01 -h3ss)= 73. 18% By rearranging eqn. (8.9a) the rotor enthalpy loss coefficient can be obtained: At rotor exit c3 is assumed to be uniform <strong>and</strong> axial. From the velocity triangles, Figure 8.3, ignoring blade to blade velocity variations. Hence, (8.13) The lowest value <strong>of</strong> this relative velocity ratio occurs when r3 is least, i.e. r 3 = r 3h = (34.4 - 20.1)/2 = 7.15mm, so that Ê Ë w w 3 2av ˆ ¯ min 2 2 12 [ ] = = 0. 475 ¥ 2. 904 0. 415 + 0. 7536 1. 19 The relative velocity ratio corresponding to the mean exit radius is
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Fluid Mechanics, Thermodynamics of
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Preface to the Fifth Edition In the
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Preface to the Fourth Edition It is
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Preface to Third Edition Several mo
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List of Symbols A area A2 area of a
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z enthalpy loss coefficient, total
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Contents PREFACE TO THE FIFTH EDITI
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Velocity diagrams of the compressor
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10. Wind Turbines 323 Introduction
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2 Fluid Mechanics, Thermodynamics o
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10 Fluid Mechanics, Thermodynamics
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CHAPTER 2 Basic Thermodynamics, Flu
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CHAPTER 3 Two-dimensional Cascades
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CHAPTER 4 Axial-flow Turbines: Two-
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CHAPTER 7 Centrifugal Pumps, Fans a
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Page 494: 230 Fluid Mechanics, Thermodynamics
Page 526: CHAPTER 8 Radial Flow Gas Turbines
Page 548: Now, Loss coefficients in 90deg IFR
Page 552: P S P S c 2 Direction of rotation (
Page 556: and, combining this with eqns. (8.2
Page 560: (ii) Rewriting eqn. (8.26), (iii) U
Page 564: Thus, combining eqns. (8.39) and (8
Page 568: U 2/c o 0.8 0.7 0.6 88 Radial Flow
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Page 576: (a) (2) (1) w 2 b2 ¢ w 2 ¢ b2, op
Page 580: Radial Flow Gas Turbines 273 This e
Page 584: Radial Flow Gas Turbines 275 FIG. 8
Page 588: Radial Flow Gas Turbines 277 FIG. 8
Page 592: Radial Flow Gas Turbines 279 occurs
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Radial Flow Gas Turbines 281 FIG. 8
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(a) f = 0.83 a 0 = q 0 U 0 = -7.18
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Measured performance Radial Flow Ga
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Radial Flow Gas Turbines 287 Whitfi
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Radial Flow Gas Turbines 289 Absolu
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Hydraulic Turbines 291 TABLE 9.1. D
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TABLE 9.3. Operating ranges of hydr
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Hydraulic Turbines 295 ridge splits
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Hydraulic Turbines 297 (9.3) (9.4)
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Hydraulic Turbines 299 FIG. 9.8. Me
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Hydraulic Turbines 301 (9.10) The e
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Neglecting bearing and windage loss
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Hydraulic Turbines 305 Figure 9.12
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Hydraulic Turbines 307 It is of int
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Hydraulic Turbines 309 constant. Th
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(a) (b) Hydraulic Turbines 311 FIG.
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TABLE 9.4. Calculated values of flo
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Hydraulic Turbines 315 gave measure
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Hydraulic Turbines 317 using Thoma
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Avoiding cavitation Hydraulic Turbi
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Hydraulic Turbines 321 nozzles. The
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CHAPTER 10 Wind Turbines Take care
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FIG. 10.2. Tower Windmill, Bidston,
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Brake discs Flexible coupling Build
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Small HAWTs Small wind turbines wit
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(iii) no flow rotation produced by
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It is convenient to define an axial
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Example 10.2. Determine the radii o
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where a - T = 0.3262. Sharpe (1990)
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each element must have an associate
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In the actuator disc analysis the v
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operate in post-stall conditions wh
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Solving the equations The foregoing
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Pitch angle, b (deg) 30 20 10 0 0.2
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TABLE 10.4. Data used for summing t
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F 1.0 0.8 0.6 0.4 0.2 0 0.4 dX = 4
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TABLE 10.5. Summary of results for
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Power coefficient, C P 0.6 0.4 0.2
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C X/(JC L) 0.14 0.12 0.10 0.08 0.06
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The flow angle j at optimum power c
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R 1 2 3 8 3 CP = P ( prR cx )= ( -a
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caused by this increased roughness
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Airfoil S820 S819 r/R 0.95 0.75 pro
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Airfoil S817 S816 r/R 0.95 0.75 NRE
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C C 0.4 0.2 -0 -0.2 -0.4 -0.6 twist
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According to Tangler (2002), some l
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understanding of the complex phenom
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References Wind Turbines 375 Abbott
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Bibliography Cumpsty, N. A. (1989).
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APPENDIX 2 Answers to Problems Chap
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Chapter 8 1. 586 m/s, 73.75 deg. 2.
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Index Terms Links Axial flow compre
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Index Terms Links Cascades, two-dim
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Index Terms Links Coefficient of, c
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Index Terms Links Diffusers (Cont.)
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Index Terms Links Francis turbine 2
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Index Terms Links Illustrative exam
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Index Terms Links Mollier diagram,
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Index Terms Links Pressure head 4 P
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Index Terms Links Rotor configurati
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Index Terms Links Thoma’s coeffic
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Index Terms Links U Units Imperial
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