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INTRODUCTION are dependent on these parameters 3s well as on pressure ratio. The Lysholm engine has been proposed for use in a hybrid system with conventional steam turbines. In t h i s hybrid system, the total flow from the wellhead isexpanded in the Lysholm engine, exhausting a t some intermediate pressure. The fluid is then direeted to a separator where the liquid phase is discarded. The steam phase is then expanded in conventional impulse turbines exhausting at subatmospheric pressures. The turbine exhaust nust then be condensed and pumped to atmospheric pressure. This hybrid system represents a trade-off between the advantages of the total-flow concept and the practical limitations considered when operating with large pressure drops. Because the Lysholm engine efficiency drops off at higher pressure ratios, more than one stage would be required to utilize the pressure drop available at most sites. Much of the fluid flashes to vapor during the Lysholm expansion process, resulting in an increase in volume of the fluid. Since the Lysholm engine is a positive displacement device, increasad volumetric flow requires larger engines. The size and cost of larger engines required by the increased volume for each sucessive stage would be prohibitive. A conventional steam turbine is thus being considered for the bottom stage of a hybrid cycle. Such a system is currently being tested and evaluated a t U.C. Berkeley. To best demonstrate the feasibility of a hybrid systen. the maximum power from the system for a given resource must be obtained. Optimization of the hybrid system performance requires detailed knowledge of the operating characteristics of a l l the system components, especially the Lysholm engine. Because the flow through the turbine nozzles is choked, the interstage pressure is dependent on the tot31 mass flow rate through the Lysholm, the Lyshol; exhaust quality and the characteristics of the separator. Of course, the system performance is also dependent on the power output and efficiency of the Lysholm engine. Unfortunately, the least well known of the components of the system is the Lysholm engine. It is the purpose of this 3PDF Image | EMPIRICAL MODELING OF A LYSHOLM HELICAL SCREW EXPANDER
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