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IQ Important performance measures for the Lysholm engine include power output and efficiency. Exhaust quality and total mass flow rate are parameters also needed for optimization of the hybrid system. The description of engine performance in dimensionless terms requires the calculation of other paraieters including specific size and specific speed. Calculation of most of these parameters requires knowledge of the state and properties of the steam at the inlet and exhaust. In practice, stean table interpolation is required. Manual data reduction involving the many required calculations on the large number of data points taken would have comprised an almost unmanageable task. The manual calculations are both tedious and impossible to perform without error. Steam table interpolation is particularly prone t o innaccuracy and error. The organization and storage of raw data is also a difficult task to perform manually. To handle these tasks, FORTRAN computer codes were #developed. The codes were runon a PDP-11/60 miniconputer using the RSX-11M operating system. As a part of the codes, a steam table subroutine was constructed and tested. Listings of programs described in this section can be found in the Appendix. The raw data necessary for a l l calculations are the uncorrected flow signals, the hot water and calorimeter tenperatures, the inlet and exhaust temperatures, and the speed and torque signals. Other information requiring storage for each data point include the run number, the run date, the barometric pressure, a conment code, and a calibration code specifying the appropriate flow calibration constants for determination of the flow rates. The data values from all scans were averaged for each run, prior to storage in the computer. The raw data entered and stored is i n the sane form as the output from the Autodata. For the Autodata channel usage and output format, refer to the Appendix PERFORMANCE MEASURES AND CALCULATIONS Performance Measures and Calculations 19 . \PDF Image | EMPIRICAL MODELING OF A LYSHOLM HELICAL SCREW EXPANDER
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