Miniature homogeneous charge compression ignition free-piston engine compressor

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Miniature homogeneous charge compression ignition free-piston engine compressor

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Tian, Lei

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2013-06

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Thesis or Dissertation

Abstract

Utilizing the high energy density of hydrocarbon fuels, an internal combustion engine based free-piston engine compressor is a promising solution as a power supply for miniature size mobile fluid power applications. A free-piston engine is a type of engine without crankshaft, and piston motion depends on force balance instead of mechanical constraints. Homogeneous charge compression ignition (HCCI) is a combustion mode in which homogeneous fuel air mixture is compressed to the point of auto-ignition. The objective of the thesis work is building a miniature size engine compressor to work as a compact fluid power supply, while combining the HCCI and free-piston engine configuration. Mathematical models for components were calibrated and verified by components testing. The overall engine compressor model correlated well with testing results of a proof-of-concept prototype. Although the prototype only achieved 0.6% overall efficiency from fuel energy to cooled compressed air because of poor compressor efficiency and high fuel short circuiting loss, the miniature free-piston engine compressor showed the potential to be a high energy density, compact fluid power supply.

Keywords

Engine compressor

Free-piston

HCCI

Miniature engine

Description

University of Minnesota Ph.D. dissertation. June 2013. Major: Mechanical Engineering. Advisors: David B. Durfee, David B. Kittelson. 1 computer file (PDF); xii, 152 pages, appendices A-E.

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Tian, Lei. (2013). Miniature homogeneous charge compression ignition free-piston engine compressor. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/156242.

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