Download or read book Effects of N Propylbenzene Addition on Soot Formation in an N Dodecane Laminar Coflow Diffusion Flame written by Liyun Zhao and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first part of this thesis addresses the validation of combined laser extinction and two-angle elastic laser scattering diagnostics for soot characterization. The results from three measurement heights (30, 40, 50 mm) of a non-smoking ethylene-air laminar coflow diffusion flame were found to agree well with those from the literatures. The second part of this thesis applies the optical diagnostics mentioned above to investigate the effects of n-propylbenzene addition on soot formation in an n-dodecane laminar coflow diffusion flame. All of the tested flames had similar temperature profiles. Soot volume fraction was found to increase at all flame heights as the mole fraction of n-propylbenzene increases. Along the centerline, the increase of the soot formation was mainly caused by the combined effect of higher soot inception rate and surface growth rate, while along the wing, the higher soot formation was mainly because of the higher surface growth rate.

Download or read book Experimental and Numerical Studies on the Soot Formation of Liquid Fuel Relevant Compounds written by Tongfeng Zhang and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In the present thesis, fundamental experimental and numerical studies are performed for the soot formation of liquid fuel relevant compounds. The thesis is composed of four research studies. The first develops an improved data analysis approach for the combined laser extinction and two-angle elastic light scattering diagnostics to relate the various measured optical cross sections to soot aggregate properties. Compared to previously reported studies, the proposed approach can be applied to a wider range of soot sources by removing the assumption made to scattering regime or moment ratio of aggregate size distribution. The second study investigates the effects of n-propylbenzene addition to n-dodecane on soot formation and aggregate structure in a laminar coflow diffusion flame using the combined laser extinction and two-angle elastic light scattering method. It is shown that the relative importance of soot inception and surface growth affected by n-propylbenzene addition is different along the flame wing and centerline, with the aromatic fuel chemistry effect being stronger along the centerline. The third study extends the investigation on the same issue using a numerical model. The simulation results show that mixing n-propylbenzene into the liquid fuel mixture accelerates soot inception, and increases soot surface growth per unit surface area by PAH addition, while soot surface growth per unit surface area by HACA is shown to decrease modestly with n-propylbenzene addition. The fourth and final study investigates the soot formation from jet fuel in a laminar coflow diffusion flame using both numerical and experimental methods. The results demonstrate the robustness of the soot model to changes of fuel and also show that the HyChem model (i.e., lumped fuel breakdown approach, Xu et al., 2017) can be used to predict soot formation from real jet fuel combustion in laminar coflow diffusion flames by adding a PAH growth scheme to the model.

Download or read book The Effect of Aromatic Structure on Soot Formation in a Laminar Co flow Diffusion Flame written by Carson Noel Chu and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The current study presents an experimental approach to investigate the effect of the structure of aromatics on soot formation. Aromatics including 1,2,4-trimethylbenzene and n-propylbenzene were chosen as the fuels in this study. A small amount of naphthalene was added to the fuel to assess the effect of naphthalene addition on soot formation. Quantitative measurements including soot volume fraction, flame temperature, and soot primary particle diameter were obtained by the Laser-induced Incandescence and Spectral Soot Emission techniques. Despite having the same molecular mass, 1,2,4-trimethylbenzene was found to be sootier than n-propylbenzene. On the other hand, the addition of naphthalene affected n-propylbenzene more than 1,2,4-trimethylbenzene on soot formation. A numerical modelling was also performed to obtain better insight of the fuel chemistry and it was shown that the models do not fully agree with the experimental results.

Download or read book Hydrodynamic Effects on Soot Formation in Laminar Hydrocarbon fueled Diffusion Flames written by Guozheng Lin and published by . This book was released on 1996 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effects of Fuel Doping and Fuel Chemistry on Soot Formation in Co flow Laminar Diffusion Flames at Elevated Pressures written by Silin Yang and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Effects of fuel doping and fuel chemistry on soot formation were studied in laminar diffusion flames at elevated pressures. Soot spectral emission is used to obtain radial temperature, soot volume fraction, and soot yield profiles. This thesis first investigated addition of 0%-40% ethanol in ethylene flames at 3-10 bar. 10% ethanol-doped flames didn't exhibit measurable soot synergy, whereas 20%-40% ethanol displayed lower soot yields. Secondly, 7.5% of benzene, cyclo-hexane and n-hexane was added into methane flames at 1.4-10 bar. Pressure dependence of sooting propensity is lowest for benzene. Thirdly, 3% of m-xylene and n-octane was mixed with methane at 1.4-10 bar. m-Xylene doped methane flames produced highest soot yields but lowest pressure dependency in soot yields. Results indicate that pressure dependence of highly sooting aromatics weakens compared to that of less sooting n-alkanes at high pressures.

Download or read book Detailed Studies of Soot Formation in Laminar Diffusion Flames for Application to Modeling Studies written by and published by . This book was released on 1993 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: An investigation of soot formation in laminar diffusion flames has shown that soot particle surface growth under laminar diffusion flame conditions ceases because of the depletion of hydrocarbon species, in particular acetylene and benzene, and not due soot particle reactivity loss due to thermal aging of the particles. This results has been obtained through direct species concentration measurements under well controlled conditions while the particle reactivity effects were calculated based on premixed flame results along with particle temperature/time information available from earlier laminar diffusion flame studies. Comparisons with a soot formation model which incorporated detailed chemistry effects showed good agreement in terms of predicted and measured species concentration and soot particle field evolution. In addition, a novel technique for measuring soot volume fraction has been developed based on laser-induced incandescence and applied to similar laminar diffusion flame, studies with good success. This technique represents a major development in terms of its ability to make soot volume fraction measurements in unsteady inhomogeneous combusting flows. Soot formation, Soot particles, Diffusion flames.

Download or read book A Fundamental Study of Soot Formation in Diffusion Flames written by Richard L. Axelbaum and published by . This book was released on 1988 with total page 510 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Soot Formation in Laminar Diffusion Flames written by eO L. Geulder and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Soot Formation in Laminar Jet Diffusion Flames written by Peter Bradford Sunderland and published by . This book was released on 1995 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Detailed Modeling of Soot Formation Oxidation in Laminar Coflow Diffusion Flames written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: PhD.

Download or read book Effect of Pressure on Soot Formation in Laminar Diffusion Flames written by Adel Maurice Iskander and published by . This book was released on 1987 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effects of Elevated Pressure on Soot Formation in Laminar Diffusion Flames written by L. L. McCrain and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effects of Pressure on the Mechanisms of Soot Formation and Oxidation in Laminar Diffusion Flames written by Chul Han Kim and published by . This book was released on 2005 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effect of Chlorine on Soot Formation in Laminar Hydrocarbon Diffusion flames written by Venkatesh B. Shyam and published by . This book was released on 1992 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Effect of Elevated Pressure on Soot Formation in a Laminar Jet Diffusion Flame written by Laura Lynne McCrain and published by . This book was released on 2003 with total page 69 pages. Available in PDF, EPUB and Kindle. Book excerpt: Keywords: diffusion flame, high pressure, soot formation.

Download or read book Effect of Oxygen Content on Soot Formation in a Co flow Diffusion Flame Fueled with Canola Methyl Ester and Diesel written by Stephanie Virginia Prado Carbonell and published by . This book was released on 2021 with total page 103 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effects of Fuel Preheat on Soot Formation in 1 G and 0 G Laminar Diffusion Flames written by Bogdan Konsur and published by . This book was released on 1997 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: