EMPIRICAL MODELING OF A LYSHOLM HELICAL SCREW EXPANDER

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EMPIRICAL MODELING OF A LYSHOLM HELICAL SCREW EXPANDER ( empirical-modeling-lysholm-helical-screw-expander )

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DATA MATRIX 12 D3ta Matrix Engine testing was performed at the maximum consistently attainable inlet pressure of 120 psia including speeds fron 4530 RPM to 9300 RPM, inlet qualities fron 0.17 to 0.99 and over a range of exhaust pressures frm the lowest attainable to over 35 psia. The data points obtained formed a three dimensional matrix in speed, inlet quality and exhaust pressure. Obtaining test data in matrix form facilitated correlation of the data and allowed empirical relations for perfornance parameters to be obtained. The matrix consists of sets of data points obtained at each of the four speeds: 4500, 6000, 7500 and 9000 RPi4. Subsets of data points were taken at each of 5 inlet qualities for each of the four speeds. Water/stea?l flow ratios of 011, 111, 2/1, 311 and 5/1 corresponding to inlet qualities of 0.99, 0.50, 0.33, 0.25 an3 0.17, respectively, were used. Each of these 20 subsets of data points consisted of tests run with -identical conditions except for varying exhaust pressure. Thus, a subset of data points with varying exhaust pressure was obtained for each combination of speed and inlet quality. An attempt was made to obtain the sane set of exhaust pressures for each canbination of speed and inlet quality. Tnis was only partially successful for two reasons. F i r s t , the limitations on .exhaust pressure due to the exhaust piping allowed much lower exha.ust pressures for some combinations of speed and i n l e t qualit y attaining of high exhaust pressures very difficult. To save time, some data from preliminary hybrid system tests with uncontrolled exhaust pressures was used to fill in the subsets of data points. The construction of t h i s data matrix was important i n correlating the data. It allows the examination of variations in performance parameters with one variable while the others are held constant. The degradation of the data matrix du; to inconsistent exhaust pressures limits these correlations to some Second, system control problems made the

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