Visualization and understanding of combustion processes using spatially and temporally resolved laser diagnostic techniques

2011 ◽  
Vol 33 (1) ◽  
pp. 69-97 ◽  
Author(s):  
Marcus Aldén ◽  
Joakim Bood ◽  
Zhongshan Li ◽  
Mattias Richter
Keyword(s):  
Diagnostic Techniques ◽  
Laser Diagnostic ◽  
Combustion Processes

scholarly journals Measuring the effectiveness of high-performance Co-Optima biofuels on suppressing soot formation at high temperature

2020 ◽  
Vol 117 (7) ◽  
pp. 3451-3460 ◽  
Author(s):  
Samuel Barak ◽  
Ramees K. Rahman ◽  
Sneha Neupane ◽  
Erik Ninnemann ◽  
Farhan Arafin ◽  
...  
Keyword(s):  
High Temperature ◽  
Shock Tube ◽  
High Performance ◽  
High Efficiency ◽  
Soot Formation ◽  
Diagnostic Techniques ◽  
Department Of Energy ◽  
Negative Consequences ◽  
Shock Heating ◽  
Combustion Processes

Soot emissions in combustion are unwanted consequences of burning hydrocarbon fuels. The presence of soot during and following combustion processes is an indication of incomplete combustion and has several negative consequences including the emission of harmful particulates and increased operational costs. Efforts have been made to reduce soot production in combustion engines through utilizing oxygenated biofuels in lieu of traditional nonoxygenated feedstocks. The ongoing Co-Optimization of Fuels and Engines (Co-Optima) initiative from the US Department of Energy (DOE) is focused on accelerating the introduction of affordable, scalable, and sustainable biofuels and high-efficiency, low-emission vehicle engines. The Co-Optima program has identified a handful of biofuel compounds from a list of thousands of potential candidates. In this study, a shock tube was used to evaluate the performance of soot reduction of five high-performance biofuels downselected by the Co-Optima program. Current experiments were performed at test conditions between 1,700 and 2,100 K and 4 and 4.7 atm using shock tube and ultrafast, time-resolve laser absorption diagnostic techniques. The combination of shock heating and nonintrusive laser detection provides a state-of-the-art test platform for high-temperature soot formation under engine conditions. Soot reduction was found in ethanol, cyclopentanone, and methyl acetate; conversely, an α-diisobutylene and methyl furan produced more soot compared to the baseline over longer test times. For each biofuel, several reaction pathways that lead towards soot production were identified. The data collected in these experiments are valuable information for the future of renewable biofuel development and their applicability in engines.

Application of laser diagnostic techniques to the catalytic oxidation of carbon monoxide in a tubular wall reactor

1988 ◽  
Vol 37 ◽  
pp. 259-272 ◽  
Author(s):  
W.A. England ◽  
A. Gilmore ◽  
D.A. Greenhalgh ◽  
W.J. Thomas ◽  
U. Ullah ◽  
...  
Keyword(s):  
Carbon Monoxide ◽  
Catalytic Oxidation ◽  
Diagnostic Techniques ◽  
Laser Diagnostic ◽  
Oxidation Of Carbon Monoxide

APPLICATION OF LASER DIAGNOSTIC TECHNIQUES FOR THE EXAMINATION OF LIQUID FUEL SPRAY STRUCTURE

1990 ◽  
Vol 90 (1) ◽  
pp. 75-102 ◽  
Author(s):  
C. PRESSER ◽  
A.K. GUPTA ◽  
H.G. SEMERJIAN ◽  
R.J. SANTORO
Keyword(s):  
Liquid Fuel ◽  
Diagnostic Techniques ◽  
Fuel Spray ◽  
Spray Structure ◽  
Laser Diagnostic

Diagnostic Techniques for PACVD Systems for Depositing Protective Coatings

1988 ◽  
Vol 117 ◽  
Author(s):  
Ward C. Roman ◽  
John H. Stufflebeam ◽  
Alan C. Eckbreth
Keyword(s):  
Protective Coatings ◽  
Plasma Chemistry ◽  
Diagnostic Techniques ◽  
Gas Temperature ◽  
Remote Sensors ◽  
Science Base ◽  
Starting Point ◽  
Plasma Species ◽  
Laser Diagnostic

AbstractPACVD techniques for depositing protective coatings are an emerging field in plasma processing technology. Technology transfer is limited by a lack of understanding of the basic mechanisms involved in the gas phase plasma chemistry. The aspects of plasma species concentration and distribution and plasma gas temperature are fragmentary and unclear. Laser diagnostic techniques represent a critical starting point for providing some of this needed information. The techniques are in-situ, nonintrusive, and give excellent spatial and temporal resolution. Numerous diagnostic techniques for detailed coating characterization are available, but a correlation of the PACVD parameters with some of the key coating properties is required. Thus, a predictive capability that is lacking in the present science base can be established together with important phenomenological aspects needed for efficient deposition of high quality protective coatings. As the mechanisms become better understood, use of remote sensors and A.I may then be introduced. This paper will review selected diagnostic techniques available for characterizing these nonequilibrium reactive plasmas and the coatings.

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