LARGE AMPLITUDE WAVE PROPAGATION IN EXHAUST SYSTEMS OF TWO-STROKE ENGINES
The characteristics of large amplitude wave propagation in variable area ducts were investigated in order to gain a more thorough understanding of exhaust systems for power-tuned two-stroke engines. An apparatus to simulate the power stroke of a two-stroke motorcycle engine was developed, using a stock Yamaha 360 MX barrel, cylinder head, piston, and ring. In this way, a single pulse of pressurized air could be introduced into virtually any duct geometry. An oscilloscope trace of the subsequent exhaust pulse and duct interaction was photographed. The resulting pressure-time histories were used to experimentally evaluate the effects of several duct terminations on the shape and timing of the reflected wave. The investigation resulted in quantifying the effects of an orifice plate and converging cone termination and in determining the best termination for a Yamaha 360 MX engine. The method used in this experiment has application in predicting the wave shapes of waves reflected off of various surfaces. The results of this analysis can be applied to computer models as a basis for determining the system parameters or to confirm whether a computer program realistically simulates an actual system.
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Availability:
- Find a library where document is available. Order URL: http://worldcat.org/issn/01487191
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Supplemental Notes:
- Presented at SAE West Coast Meeting, San Diego, 7-10 August 1978.
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Corporate Authors:
Society of Automotive Engineers (SAE)
400 Commonwealth Drive
Warrendale, PA United States 15096 -
Authors:
- Murphy, M J
- Margolis, D L
- Publication Date: 1978
Media Info
- Features: References;
- Pagination: 14 p.
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Serial:
- SAE Technical Paper
- Publisher: Society of Automotive Engineers (SAE)
- ISSN: 0148-7191
- EISSN: 2688-3627
- Serial URL: http://papers.sae.org/
Subject/Index Terms
- TRT Terms: Emission control systems; Exhaust gases; Motorcycles; Two stroke cycle engines; Wave motion
- Subject Areas: Safety and Human Factors; Vehicles and Equipment;
Filing Info
- Accession Number: 00396995
- Record Type: Publication
- Source Agency: National Highway Traffic Safety Administration
- Report/Paper Numbers: SAE 780708, HS-025 563U
- Files: HSL, USDOT
- Created Date: Aug 31 1985 12:00AM