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CHAPTER 3: Methodology for Developing Radial Inflow Turbine (RIT) 3.5.4.6. Windage loss (ππ )0.1 ππ = 3.7 π4 π π0.5 (ππ)0.1 ππ = 0.102 π4 π π0.2 Nozzle friction loss πππ π π < 105 πππ π π > 105 Equation 3-51 Equation 3-52 π₯hππ₯ππ‘ = 5 2 Equation 3-49 π₯hπ€ππππππ = π 4 4 4πΜ πΆ2 The only external loss that is usually considered in the modelling of RIT is the windage (disc friction) loss due to the fluid leakage between the back face of the rotor disc and the stationary turbine back plate (Whitfield et al. 1990) shown in Figure 3-6. Equation 3-50 depicts the windage loss. Equation 3-50 π πΜ π3π2 Where πΜ is the average density between the rotor inlet and exit, Ξ΅b is the rotor back plate clearance obtained by Equation 3-48 and kf is calculated as below (Whitfield et al. 1990). 3.5.4.7. Nozzle friction loss is found by Equation 3-53 (Whitfield et al. 1990) where πΆΜ is the average of the nozzle inlet and exit absolute velocities and f is obtained by Equation 3-39. π₯hπππππ‘πππ,πππ§π§ππ = 4ππΆΜ 2 πhπ¦π,πππ§π§ππ πhπ¦π,πππ§π§ππ Equation 3-53 Equation3-54 Equation3-55 Further details regarding the developed mean-line code in EES is provided in Appendix (B). π =π βπ hπ¦π,πππ§π§ππ 2 3 πhπ¦π,πππ§π§ππ =0.5( 2 3 2 + 4ππ π 8ππ π cosπΌ 8ππ π cosπΌ 3 3 3) 4ππ π 4ππ + 3 3 4ππ + 2 3 2π3π 74 | P a g ePDF Image | SMALL-SCALE RADIAL INFLOW TURBINE FOR WHR ORC
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