"Homogeneous charge compression ignition (HCCI) combustion introduces great opportunity for decreased emissions along with greater engine efficiencies. Implementing an innovative combustion mode such as HCCI presents a great challenge for the engine research community. One such challenge is controlling the innate cyclic variability from this chemical kinetics controlled auto-ignition event when transitioning to or from a SI operating mode. This work includes the study of cycle-to-cycle dynamics that occur within the partial burn regime of an HCCI engine as it approaches the misfire limit. Within this regime there are many successive incomplete combustion events that will impact the next cycle through the fuel/air residual, the chemical kinetics, and the pressure-temperature history of the cylinder during the combustion process. A better understanding of this process will provide information relevant to developing control methods for multi-mode operating strategies. Experiments were conducted using a single cylinder HCCI engine operating in an unstable combustion regime in order to observe cyclic variability using rapid exhaust pressure and temperature measurements to appropriately capture any deterministic behavior of the combustion dynamics. On-board syn-gas strategies were also explored by injecting a reactive species gas, carbon-monoxide, directly into the cylinder in order to perturb the intake charge and study the effects this mass injection had on the onset of combustion in HCCI. This could be utilized as one method of control by an engine control unit in order to push the limits of unstable combustion as well as keep the engine within stable operating regions"--Abstract, page iii.
Drallmeier, J. A.
Isaac, Kakkattukuzhy M.
Mechanical and Aerospace Engineering
M.S. in Mechanical Engineering
National Science Foundation (U.S.)
Missouri University of Science and Technology
xiv, 155 pages
© 2012 Aaron David Attebery, All rights reserved.
Thesis - Open Access
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Attebery, Aaron David, "Investigating the effects of internally trapped residuals on the performance of a homogeneous charge compression ignition (HCCI) engine" (2012). Masters Theses. 6926.