Design, development, and experimental analysis of a two-stage flameless combustion engine by method of homogenous charge compression ignition

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Davani, Sina
Asmatulu, Ramazan

The future of the internal combustion (IC) engine continues to be at risk as many industries are gravitating towards alternative power generation. The motivation behind constructing this technology is not to reinvent the IC engine but to recreate interest on combustion. Homogenous Charge Compression Ignition (HCCI) has the capability to increase efficiency and produce low levels of Hydrocarbon (HC) and (Nitric Oxide) NOx emissions. The concept of HCCI uniquely combines the characteristics of conventional gasoline engines as well as those of diesel engines. Conventional gasoline engines use spark plugs to ignite the air fuel mixture in the cylinder, while diesel engines combine a stratified charge (SC) and compression to create ignition. HCCI injects fuel and air during the intake stroke; however, rather than using a spark plug to ignite the mixture within the cylinder, HCCI increases the density and pressure in the cylinder exponentially by compression, causing auto-ignition of the air fuel mixture. In this thesis, the IC engine was further enhanced through a unique reconfiguration of the piston and cylinder head of a single-cylinder 5 horsepower (HP) spark ignited karting engine. The unique design idea required for total elimination of the spark plug, to allow HCCI to take place. After the design process and development of the redesigned engine parts, the prototype was assembled and experimented for proof of concept. A fully functional prototype is shown to support this proposal, leading to a new approach on HCCI with higher engine power and lower emissions using various fuels.

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Thesis (M.S.)-- Wichita State University, College of Engineering, Dept. of Mechanical Engineering