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1 TESTING PROCEDURES 14 Testing Procedures Testing procedures to improve consistency of data .included a prescribed engine warm-up period and checks for residual readings on the flow meters. Data acceptance criteria were followed to insure the quality of the data matrix. In-lab data control calculation methods were developed to aid in evaluating the data. Actual control of the engine was achieved by varying the engine load, the exhaust pressure, the flow rate and the flow ratio. During start-up, steam is first run through the system to warm the lines (refer to engine start-up check list in the Appendix). At some time during this warm-up, the steam is shut off to insure that the flow meters go to zero. The meters were also checked for zeroes at shutdown. A persistent problem during a residual reading on the stean flow meter upon It is thought that non-condensible gases(air1 were in the low side seal pot. This caused a lowering of level in this seal pot during testing, resulting in a testing was shutdown. building up the water level differential of several inches between the seal pots and a residual reading of 5-101 of full scale. Because the flow rate is proportional to the square root of the pressure drop across the orifice plate, this residual translates into only a 1-22 error under normal operating conditions. It was, however, decided to bleed steam from thetopoftheseal pots to eliminate this problem. Though the bleeding of steam did no doubt eliminate the build-up of non-condensible gases, it caused another problem. The stearn bleeding through the low side seal pot was superheated due to the pressure drop across the orifice plate. This superheated steam did not allow normal condensation, causing a fluctuation in the water level in the seal pot. The residual reading from t h i s fluctuation was even more severe than the original residual from the non-condensible gases. The problem was finally solved by the manufacture of water cooling jackets for the lines between the orifice plates and the seal pots. This cooled the bleeding steam to the point where enough would condense to maintain a level in the seal pots. \PDF Image | EMPIRICAL MODELING OF A LYSHOLM HELICAL SCREW EXPANDER
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