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...-.. PERFORMANCE MEASURES AND CALCULATIONS 20 The computer code utilizes a direct access file for data storage. Each numbered record line in the file holds the raw data for a single point. The data are organized into a three dimensional matrix corresponding to the matrix used for data acquisition. The dimensions of the matrix are flow ratio, speed and exhaust pressure. When accepting data, the computer prompts for a +digit code which explicitly specifies the position along each of the three axes of the matrix. The three digits are then converted into a one dimensional array element number corresponding to the number of a record line in the file. When reduction or output of data is desired, a point or set of points can be obtained using the same 3-digit code. Organization of data in this manner makes the program very versatile in the creation of data files for plotting or analysis. Two versions of the program were used to produce different types of reduced output. One program produces output files with headers and peripheral information such as run number and run date. The other program produces output files in a bare form suitable for use as source files for plotting routines. Another important feature of the computer codes is a steam table subroutine linked to the main program for determination of stean states. The subroutine is essentially a look-up table with logarithmic interpolation routines for determination of properties inside a skeleton of steam data points. Steam data was obtained from the 1967 ASYE Steam Tables173. The current range of the table includes the region inside the vapor dome extending out to 70 OF superheat. The upper and lower pressure l i m i t s are 0.95 psia and 153 psia, respectively. The table was originally designed to accept an input state specified by pressure or temperature and one other property including specific volume, enthalpy, entropy or quality. A state specified by pressure and tenperature is allowed i n the superheated region. The capability for specification of state by specific volume and entropy was later appended for future use in simulation modeling. The state specifying properties are passed as arguments to thePDF Image | EMPIRICAL MODELING OF A LYSHOLM HELICAL SCREW EXPANDER
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