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' investigation to define the Lysholm engine operating characteristics and develop a model which can be used in the prediction of the optimum operating conditions for the hybrid system. Several types of engine model are possible. A model based on conventional dimensionless parameters, a simulation model considering the physical processes inside the engine and a "black box" empirical model were all considered. To limit the scope of t h i s project to a manageable level, because sufficient knowledge about t h e engines physical processes and important dimensionless paraneters is lacking and because the empirical model is easiest to implement, the empirical model was chosen for initial use in t h e hybrid system optimization. To obtain the data required for construction of the model, a program of engine testing in an operating domain including the range expected to be used in the hybrid system had to be undertaken. Data control methods ha3 to be develope3 to allow the taking of test data with operating conditions controlled to a discrete matrix suitable for the empirical curve fit. A computer program was required to manage the huge task of organizing, storing and reducing data for approximately 100 data points. As a part of t h i s cmputer program, a steam table subroutine had to be developed for evaluation of thermodynamic properties. Once a conplete set of data is obtained, curve fitting methods in several paraneters can be applied to obtain algebraic expressions for system performance in terms of operating conditions. Expressions must be obtained for power, efficiency, mass flow rate and exhaust quality in terms of pressure ratio, inlet quality and engine speed for the maximum obtainable inlet pressure of 120 psia. Tnese expressions inust then be converted to the form of a coinputer code subroutine for implenentation in t h e hybrid model. Tne model should be tested for validity by predicting performance under a new set of operating conditions, then testing the engine under these conditions. Points within the current INTRODUCTION 4 bPDF Image | EMPIRICAL MODELING OF A LYSHOLM HELICAL SCREW EXPANDER
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