The tracer gas method is investigated as a means to study scavenging in fuel-injected large-bore two-stroke cycle engines. The investigation is performed on a Cooper-Bessemer GMV-4TF natural gas engine, with a 36-cm bore and a 36-cm stroke. Two important parameters are evaluated from the tracer gas measurements, which are scavenging efficiency and trapped A/F ratio. Measurements with the tracer gas method are compared with in-cylinder sampling techniques to evaluate the accuracy of the method. Two different tracers are evaluated, monomethylamine and nitrous oxide. Monomethylamine is investigated because of its common use historically as a tracer gas. Nitrous oxide is a new tracer gas that overcomes many of the difficulties experienced with monomethylamine. The tracer gas method with nitrous oxide is determined to be accurate for evaluating scavenging efficiency and trapped A/F ratio in comparison to the in-cylinder sampling techniques implemented.
Development of the Tracer Gas Method for Large Bore Natural Gas Engines—Part I: Method Validation
Contributed by the Internal Combustion Engine Division of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS for publication in the ASME JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received by ICE Division, July 2000; final revision received by the ASME Headquarters August 20001. Editor: D. N. Assanis.
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Olsen , D. B., Hutcherson, G. C., Willson , B. D., and Mitchell, C. E. (June 19, 2002). "Development of the Tracer Gas Method for Large Bore Natural Gas Engines—Part I: Method Validation ." ASME. J. Eng. Gas Turbines Power. July 2002; 124(3): 678–685. https://doi.org/10.1115/1.1454116
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