Insights into Conventional and Low Temperature Diesel Combustion Using Combustion Trajectory Prediction Model
MetadataShow full item record
Attempting to bridge the gap between typical off-line engine simulations and online real-time control strategies a computationally efficient model has been created that predicts the combustion trajectory (path through the ϕ-T plane). To give an indication of time progression in the combustion event the results are first shown as a function of crank angle, but most discussion is focused on the behavior of the combustion trajectory on the ϕ-T plane. The conditions investigated here include injection timing sweeps between a conventional and late timing (8° and 0° before top dead center, or bTDC, respectively) as well as full exhaust gas recirculation (EGR) sweeps at both timings. These test conditions highlight how EGR influences the combustion trajectory at different timings – i.e., showing the typical soot-NOx trade-off and the defeat of this trade-off when low temperature combustion (LTC) is obtained. The major insight gained from this modeling approach is how LTC trajectory is different from conventional case in the ϕ-T plane. Attempting to understand the differences and hypothesizing about the causes suggests that there is no specific region that is defined as LTC. In fact the LTC trajectory looks very similar to a conventional one with just subtle differences that keep it from moving into the soot formation region. Additionally, the traditional conceptual explanations for diesel combustion are explored relative to how they are illustrated in the combustion trajectory, especially the transition from pre-mixed to mixing controlled combustion. Understanding this behavior in this context aids in explaining the different observations for the LTC modes.
Bittle, Joshua A (2014). Insights into Conventional and Low Temperature Diesel Combustion Using Combustion Trajectory Prediction Model. Doctoral dissertation, Texas A & M University. Available electronically from
Showing items related by title, author, creator and subject.
Combustion Assisted Gravity Drainage (CAGD): An In-Situ Combustion Method to Recover Heavy Oil and Bitumen from Geologic Formations using a Horizontal Injector/Producer Pair Rahnema, Hamid (2012-11-21)Combustion assisted gravity drainage (CAGD) is an integrated horizontal well air injection process for recovery and upgrading of heavy oil and bitumen from tar sands. Short-distance air injection and direct mobilized oil ...
A High Efficiency and Clean Combustion Strategy for Compression Ignition Engines: Integration of Low Heat Rejection Concepts with Low Temperature Combustion Li, Tingting (2017-07-18)Reciprocating engines are pervasively used in the transportation industry. The transportation industry is centered on achieving two important but often conflicting goals: 1) improved energy efficiency and 2) decreased ...
Penberthy, Walter Lawren (Texas A&M University, 1965)Not available