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TESTING PROCEDURES 15 Other procedures to insure data consistency included an engine warm-up specification and consistent a i r and water seal operation. The o i l return temperature from the engine was always allowed to reach 140 OF before data was taken. The oil pressure, adjusted by manipuatiion of a bypass valve, was always maintained a t approximately 9 psig. An a i r seal pressure of 40 psig was maintained. The operation of the water seal depended on testing conditions. If only pure steam was used to produce an i n l e t quality of 99Z,the water seal was operated. If any hot water was mixef with the steam to produce other qualities, the-water seals were turned off. Control of operating conditions for the engine was accomplished by varying the load, flow rate, flow ratio, and exhaust pressure. Since flow r a t e , flow r a t i o and exhaust pressure are dependent on other operating conditions, automatic control of these variables was required. Load on the engine is independent of other variables, allowing manual control. Varying the load on the engine was acconplished by varying the current applied to the eddy current brake. Increasing the load increased the inlet pressure while decreasing the speed. If uncontrolled, the exhaust pressure also increased with an increase in load, The steam flow rate was maintained at a given setpoint by a pneunatic PI-type controller. Increasing the mass flow rate increased both speed and i n l e t pressure a s well a s uncontrolled exhaust pressure. The flow ratio, the ratio between water and steam flow rates, was maintained by a pneumatic PI-type controller working i n conjunction with the steam flow controller. Because the controller uses the uncorrected flow rate signals, the controller setpoint corrosponds to different flow ratios at different flow levels. This means that adjustment of the setpoint for changing conditions was necessary.PDF Image | EMPIRICAL MODELING OF A LYSHOLM HELICAL SCREW EXPANDER
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