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Expansion Ratio of a Lysholm Screw Expander

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Expansion Ratio of a Lysholm Screw Expander ( expansion-ratio-lysholm-screw-expander )

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Introduction 2 versity of California. Previous experiments have revealed that, while the expansionisefficient,.a’great deal of energy is lost due to leakage. High leakage rates are an inherent difficulty with the design. The sealing of the expansion chamber is defined by the meshline between the two rotors, the circum- ference of the rotors against the case and by the high pressure ends of the rotors against the inlet plate. This complicated sealline resultsin a large area over which leakage may pass. The leakage fraction typically has been fifty percent of the total flow. There are several ways that the leakage fraction may be decreased. For instance,clearances may be decreased. Increasing engine speed is another way to reduce the leakage fraction. Problems are encountered with eitheroneof these approaches. In the c t confi~irations,clearancesare already close enough that the rotors have locked together Increasing the speed is not 0 rpm,we are already exceeding of the flexible belt between 00 rpm. Failure of this the engine. Also,at higher speed,dynamic losses increase, associated with accelerating the water. eakage flowisto se omplished by in rough which t h .

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