Browse Publications Technical Papers 670477
1967-02-01

The Pressure-Time History in the Exhaust System of a High-Speed Reciprocating Internal Combustion Engine 670477

Measurement of pressure-time histories in the exhaust system of a naturally aspirated internal combustion engine poses some difficult instrumentation problems. This paper describes an experimental and theoretical approach in tackling this research. The exhaust system is simulated by pulses of compressed air at a frequency of up to 4000 pulses/minute, that is, a 1 cyl 4 stroke cycle engine running at 8000 rpm. The pressure-time histories are calculated by digital computer in terms of the cylinder, exhaust valve, and pipe friction characteristics and compared with the experimental pressure-transducer records at various positions in the exhaust system.

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