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A Method for Turbocharging Single-Cylinder, Four-Stroke Engines

SAE International Journal of Engines

Massachusetts Institute of Technology-Michael Buchman, Devarajan Ramanujan, Amos G. Winter
  • Journal Article
  • 03-11-04-0028
Published 2018-07-24 by SAE International in United States
Turbocharging can provide a low cost means for increasing the power output and fuel economy of an internal combustion engine. Currently, turbocharging is common in multi-cylinder engines, but due to the inconsistent nature of intake air flow, it is not commonly used in single-cylinder engines. In this article, we propose a novel method for turbocharging single-cylinder, four-stroke engines. Our method adds an air capacitor-an additional volume in series with the intake manifold, between the turbocharger compressor and the engine intake-to buffer the output from the turbocharger compressor and deliver pressurized air during the intake stroke. We analyzed the theoretical feasibility of air capacitor-based turbocharging for a single-cylinder engine, focusing on fill time, optimal volume, density gain, and thermal effects due to adiabatic compression of the intake air. Our computational model for air flow through the intake manifold predicted an intake air density gain of 37-60% depending on heat transfer rates; this density translates to a proportional to power gain. An experimental setup was constructed to measure peak power, density gain, and manifold pressure. With an…
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