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A schematicdrawingshowingtheradialoutflow(ROF)turbine geometryappearsinFigure1. The2factorsassociatedwith several detailed ROF turbines are shown plotted in Figure 5. datausedtocomputethesefactorsisincludedinFigure6. The shape of the curve is uniquely associated to the characteristics of the ROF turbine. As stages are added to the single stage design,the2factordecreases. Thisisbecausetheadditional stages are forced to operate at non-optimum u/c ratios--due to reduced tip speeds imposed on the inner stages of the ROF geometry. For turbines of five or more stages, the 2 factor increases. This results from two ROF turbine characteristics stated earlier: (1) individual stages in an ROF design increase in efficiency from inlet to exit due to improved blade jet (u/c) velocity ratios at the larger diameters, and (2) the energy release per stage increases from inlet to exit, In summary, the overall dry expansion efficiency is aefined 10.650 Re0.02661 as: Where 2 is obtained from Figure 5 and-Re is defined by the fol- lowing equation: with, Re = 2.59 bN' K b= mveN 60060 (VSp)' N = 141957 (E)-0*2947-6533 (See Figure 10) An ideal turbine expansion enthalpy drop (Ah-)is shown plotted onaMollierChartinFigure7. Designspectficationsforthis steam Rankine cycle being as follows: TurbineInletTemperature: llOOOF TurbineInletPressure: 1000psia Condenser Pressure: 1.0 psia The computing of m from Ahi is a reiterative process, which is described in the section on Steam Rankine Cycle Performance. TURBINE EFFICIENCY (WET) -- ;>vera11turbine efficiency (nd) must be adjusted whenever the quality of the turbine's exhaust steam is less than a value ofone. Theequationcorrectingformoistureinaturbine expansion is a modified Baumann rule, as follows: 7 ThePDF Image | Radial Outflow Turbine for Solar Steam Rankine Engines
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