Evaporation characteristics of fuel spray and low emissions in a lean premixed-prevaporization combustor for a 100 kW automotive ceramic gas turbine

Ohkubo, Yoichiro; Idota, Yoshinori; Nomura, Yoshihiro

doi:10.1016/s0196-8904(96)00159-8

Cited by 8 publications

(3 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Fuel (natural gas) and air undergo separately extensive mixing with recirculating furnace gases (products of combustion) and arrive at the reaction zone diluted by furnace gases, thus, lowering the temperature of the reaction and reducing NO, emissions. The burner has NO, emission levels from 2 to 40 ppm at 3 A lean premixed-prevaporization combustor (PPL-1) for a 100 kW automotive ceramic gas turbine has been developed to meet the Japanese emission standards for passenger cars withont using after treatment [169]. To study the evaporation characteristics, which arc indispensable for improvement of a fnel atomizer, the authors built a €tiel-air preparation tube that consists of prevaporization-premixing hibe (P,P-hibe) and swirl chamber.…”

Section: Impact Of No Emissions On Burner Technologymentioning

confidence: 99%

Oxidation of Fuels in the Cool Flame Regime for Combustion and Reforming for Fuel Cells.

Naidja

Butcher²,

Mahajan

2002

View full text Add to dashboard Cite

2 3 4 The pmpose of this review was to integrate the most recent and relevcant investigations on the auto-oxidation of fuel oils and their reforming into hydrogen-rich gas that conld serve as a feed for fiiel cells and combustion systems. We consider the incorporation of partial oxidation under cool flame conditions to be a significant step in the reforming process for generation of hydrogen-rich gas. Therefore, we have paid particnlm attention to the partial oxidation of fiiels at low temperatnre in the cool flame region. This is still not a well-understood featnre in the oxidation of fiiels and can potentially serve as a precursor to low NO, emissions and low soot formation. Pretreatment, including atomization, vaporization and burner technology are also briefly reviewed. The oxidation of reference fuels (n-heptane C7H16, iso-octane CaHls and to a lesser extent cetane Cl~H34) in the intermediate and high temperahire ranges have been stndied extensively and it is examined here to show the significant progress made in modeling the kinetics and mechanisms, and in the evaluation of ignition delay times. However, due to the complex nature of real fuels such as petroleum distillates (diesel and jet fuel)

show abstract

Section: Impact Of No Emissions On Burner Technologymentioning

confidence: 99%

Oxidation of Fuels in the Cool Flame Regime for Combustion and Reforming for Fuel Cells.

Naidja

Butcher²,

Mahajan

2002

View full text Add to dashboard Cite

show abstract

“…As a result, in detailed computational fluid dynamics (CFD) simulations of conventional combustion systems, it is common practice to effectively describe the high-temperature oxidative region, which is the most important in terms of heat release and pollutant formation [3]. However, there are specific applications, where the low-and intermediate-temperature oxidative regions become important, for example, homogeneous charge compression ignition (HCCI) internal combustion engines (ICE) [4][5][6], lean premixed prevaporized (LPP) combustors in gas turbines [7,8], and liquid fuel reformers for fuel cell applications [9][10][11] or industrial safety [12,13]; in these cases, cool flame reactions largely determine the overall reactivity and have to be taken into account.…”

Section: Introductionmentioning

confidence: 99%

Development and Parametric Evaluation of a Tabulated Chemistry Tool for the Simulation of n-Heptane Low-Temperature Oxidation and Autoignition Phenomena

Vourliotakis

Kolaitis

Founti

2014

Journal of Combustion

View full text Add to dashboard Cite

Accurate modelling of preignition chemical phenomena requires a detailed description of the respective low-temperature oxidative reactions. Motivated by the need to simulate a diesel oil spray evaporation device operating in the "stabilized" cool flame regime, a "tabulated chemistry" tool is formulated and evaluated. The tool is constructed by performing a large number of kinetic simulations, using the perfectly stirred reactor assumption. n-Heptane is used as a surrogate fuel for diesel oil and a detailed n-heptane mechanism is utilized. Three independent parameters (temperature, fuel concentration, and residence time) are used, spanning both the low-temperature oxidation and the autoignition regimes. Simulation results for heat release rates, fuel consumption and stable or intermediate species production are used to assess the impact of the independent parameters on the system's thermochemical behaviour. Results provide the physical and chemical insight needed to evaluate the performance of the tool when incorporated in a CFD code. Multidimensional thermochemical behaviour "maps" are created, demonstrating that cool flame activity is favoured under fuel-rich conditions and that cool flame temperature boundaries are extended with increasing fuel concentration or residence time.

show abstract

“…The ignition of a fuel stream injected into surrounding hot oxidizer is a problem encountered in many practical situations: for example, multi-staged or sequential combustors and afterburners where fresh fuel is injected at the outlet of the principal combustion chamber and burns in a second chamber, or the so-called lean premixed prevaporized (LPP) burners (Ohkubo et al 1997) where liquid fuels are atomized by injection into hot air to accelerate the evaporation process (Fig. 1a).…”

mentioning

confidence: 99%

Comparison of computational methodologies for ignition of diffusion layers

Knikkerr

Dauptain

Cuenot

et al. 2003

Combustion Science and Technology

View full text Add to dashboard Cite

The prediction of the auto-ignition delay time of fresh fuel in hot air is studied.This problem, encountered in many combustion systems, is in practice often calculated using a simple method, hereafter called homogeneous mixing ignition (HMI).This method however neglects transport effects and calculates local instead of global ignition properties. A second method is therefore studied called linear mixing ignition (LMI) and consists of the direct simulation of a one-dimensional mixing layer.This method is tested in a hydrogen and methane fuel configuration using detailed and reduced chemistry mechanisms. The results indicate that molecular transport increases the ignition delay, for the methane fuel by about a factor three, but this effect is compensated in the hydrogen case by the small Lewis number of the fuel.Such detailed information is not provided by the HMI method and the LMI approach appears therefore as a minimum requirement for the correct estimation of the ignition delay time.

show abstract

Evaporation characteristics of fuel spray and low emissions in a lean premixed-prevaporization combustor for a 100 kW automotive ceramic gas turbine

Cited by 8 publications

References 5 publications

Oxidation of Fuels in the Cool Flame Regime for Combustion and Reforming for Fuel Cells.

Oxidation of Fuels in the Cool Flame Regime for Combustion and Reforming for Fuel Cells.

Development and Parametric Evaluation of a Tabulated Chemistry Tool for the Simulation of n-Heptane Low-Temperature Oxidation and Autoignition Phenomena

Comparison of computational methodologies for ignition of diffusion layers

Contact Info

Product

Resources

About