Performance Characteristics of the Lysholm Engine

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Performance Characteristics of the Lysholm Engine ( performance-characteristics-lysholm-engine )

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t qualities are more efficient, It is true that water has a much higher , energy density than steam,therefore implying the enercy l o s t due t o similar volumetric leakage isgreater for high water ratios, but it appears that most of the leakage is i n the stcam phase, even at very low qualities, Second,leakageisaboutconstantoverrpmforsteam, butdecreaseswithmm f h First, leakage is greater f o r higher qualities, helping t o explain why lower is gmphed in Figure 27, showing three interesting tendencies. 8. Both of these tendencies can be explained by the viscosity ratio of mter to steam, the more viscous water tends to resist leakage more, This effect i s especially pronounced a t higher rgm, . . ' ., where thereisless time for the water toleakandwhore centrifugal forces throwthewatertotherotoredges, ineffectscalingtheedgesasinst steam leakage. The third tendency is that of leakage t o increase with increasing inlet pressures, This Ps t o be expected since the pressure differential across the . rotor edges isthedriving force for the leakage, If the stcam lcakage flowisassumed to be choked flow, then one can calculate theareaacross increase f o r higher water ratios, which the leakage occurs, thus giving the rotor clearances, relation: 97 where i,= mass leakaee (lb/s) A* = leakage area (cubic inches) p1 = inlet pressure (pia) From Grashof's -. : 1

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