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MODEL1NC 29 A simulation model would be an attempt to explain the engine performance in terms of the physical processes occur.ring inside the engine. One promising approach would follow the state of the steam in the chambers as they expand down the mesh line. The idealized isentropic expansion of the fluid in the chambers, the leakage fro3 chamber to chamber and into the exhaust, the acceleration of the fluid as it moves into the engine, and the frictional heating of fluid resulting from drag are among the processes to be considered. The rotation of the rotors and expansion of the chambers is simulated incrementally. The effects of a l l processes involving the fluid i n a given chamber at the end of the increment are combined using the principles of conservation of mass and energy to fix the resulting state of the fluid. This becones the initial condition for the next increment. A stable simulation, starting with sone arbitrary set of intermediate chamber conditions, would reach some set of equilibriun intermediate chamber conditions after the model has run for a time. The exhaust s t a t e is thus predicted, allowing determination of the exhaust enthalpy and exhaust quality. The enthalpy change and any heat transfer from the engine could be combined to predict the power extracted from the engine. The mass flow rate, predicted from simulation of the inlet, could then be used to predict efficiency. The simualtion nodel could predict improvements in performance resulting from design changes affecting the engine processes without further testing. This model could also be applied imaediately i n simulation of larger engines, predicting the effects of scale. Unfortunately, a simulation model as described is beyond the scope of t h i s investigation. The constuction of t h i s model would be a very difficult and extensive task. Since not all leakage in the engine is choked flow, closed form solutions for the state in any given chamber are not possible. Another problem with the simulation approach is the difficulty i n obtaining information about the physical processes and the geometry inside the engine.PDF Image | EMPIRICAL MODELING OF A LYSHOLM HELICAL SCREW EXPANDER
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