A5026587404- Advanced Combustion Engine Technologies
- Combustion and flame dynamics
- Heat transfer and supercritical fluids
- Biodiesel Production and Applications
- Catalytic Processes in Materials Science
- Vehicle emissions and performance
- Combustion and Detonation Processes
- Advanced Thermodynamic Systems and Engines
- Thermodynamic and Exergetic Analyses of Power and Cooling Systems
- Rocket and propulsion systems research
- Advancements in Solid Oxide Fuel Cells
- Refrigeration and Air Conditioning Technologies
- Nuclear reactor physics and engineering
- Thermochemical Biomass Conversion Processes
- Phase Equilibria and Thermodynamics
- Advanced Algorithms and Applications
- Advanced Control Systems Optimization
- Heat Transfer and Boiling Studies
- Solar-Powered Water Purification Methods
- Spacecraft and Cryogenic Technologies
- Nuclear Materials and Properties
- Catalysis and Oxidation Reactions
- Electrocatalysts for Energy Conversion
- Fuel Cells and Related Materials
Stony Brook University
2014-2020
University of Michigan
2010-2012
National Technical University of Athens
2006
Advanced combustion concepts, like homogeneous charge compression ignition, are limited by their narrow operating range, which stems from a lack of control over the heat release process. This study explores new advanced mode, called thermally stratified uses direct water injection event to process in low-temperature combustion. A three-dimensional computational fluid dynamics model coupled with detailed chemical kinetics is used better understand effects on thermal stratification cylinder...
Natural gas (NG) is a gaseous fuel, which has been extensively used and investigated in spark-ignition automotive engines (SI). Combining it with lean combustion shown the potential to reduce emissions improve efficiency compared stoichiometric gasoline engines. The main limitations of NG are instability ignitability. Supplementing hydrogen (H2) considered solution studied literature. This study focused on reviewing work performed by researchers effect partial supplementation H2 combustion,...
Low-temperature combustion has shown the potential to provide solutions for future clean and efficient powertrain systems. Traditional approaches using first law of thermodynamics have been established describing energy flows within engine systems comparing losses between low-temperature traditional modes. An augmented approach, second thermodynamics, can be utilized gain insight into exergy system thus identify areas irreversibilities inefficiencies. The present article aims at introducing...
The development of gasoline compression ignition engines operating in a low temperature combustion mode depends heavily on robust control the heat release profile. Partial fuel stratification is an effective method for controlling by creating stratified mixture prior to autoignition, which can be beneficial operation across wide load range. In this study, three-dimensional large eddy simulations were used model double direct injection strategy 80% was injected during intake stroke, and 20%...
Homogeneous Charge Compression Ignition (HCCI) combustion has the potential for high efficiency with very low levels of NOx and soot emissions. However, HCCI thus far only been achievable in a laboratory setting due to following challenges: 1) there is lack control over start rate combustion, 2) limited narrow operating range. In present work, injection water directly into chamber was investigated solve aforementioned limitations HCCI. This new advanced mode called Thermally Stratified...
There is continuously growing interest in renewable biofuels for combustion engines to help reduce transportation energy consumption. In the present work, ethanol and a Primary Reference Fuel (PRF) were studied an advanced LTC concept using CFD. A split injection strategy was used where majority of fuel injected early during intake stroke create well-mixed charge, while portion charge direct closer ignition induce forced thermal equivalence ratio stratification similar partial (PFS). This...
This study discusses a novel approach toward homogeneous charge compression ignition operation in the 5 - 10 bar net indicated mean effective pressure range. is based on combination of boosting and variable valve actuation to maximize engine efficiency. Compression ratio plays key role determines low-temperature combustion feasibility modern gasoline concepts. In order explore interactions between ratio, system actuation, multi-cylinder models were utilized which employed University Michigan...
High heat release rates limit the operating range of homogeneous charge compression–ignition engines to low and medium loads. Thermal stratification has been shown stagger autoignition, lower rates, extend engines. However, dependence naturally occurring thermal on engine size, speed, internal residual dilution is not fully understood. A three-dimensional computational fluid dynamics model with large eddy simulations detailed chemical kinetics was developed using CONVERGE. This used simulate...
Homogeneous charge compression ignition (HCCI) combustion has shown the potential to improve gasoline engine efficiency, by integration into future dual-mode spark ignition/HCCI engines. With current trend of downsizing and boosting, it is critical implement HCCI under elevated pressure, assess its for high load efficient operation. Thermodynamic analysis such engines provides insight energy flows systems, enables optimal design efficiency. This study focused on modeling a 4-cylinder boosted...
The operating range of Homogeneous Charge Compression Ignition (HCCI) engines is limited to low and medium loads by high heat release rates. Negative valve overlap can be used control ignition timing diluting the mixture with residual gas introducing thermal stratification. Cyclic variability in HCCI NVO result reduced efficiency, unstable operation, excessive pressure rise Contrary spark-ignition engines, where sources cyclic are well understood, there a lack understanding effects...
Homogeneous charge compression ignition (HCCI) combustion has the potential for high efficiency with very low levels of NOx and soot emissions. However, HCCI thus far only been achievable in a laboratory setting due lack control over start rate its narrow operating range. In present work, direct water injection (WI) was investigated to solve aforementioned limitations HCCI. This new advanced mode is called thermally stratified (TSCI). A three-dimensional computational fluid dynamics (3D CFD)...