317 Study on Ignition and Combustion of a Fuel Spray in Low Oxygen Mole Fraction Condition

2004 ◽  
Vol 2004.79 (0) ◽  
pp. _3-33_-_3-34_
Author(s):  
Hideaki NAKANO ◽  
Takuji ISHIYAMA ◽  
Masahiro SHIOJI ◽  
Tadayoshi IHARA ◽  
Tsuneki MATSUO
Keyword(s):  
Mole Fraction ◽  
Fuel Spray ◽  
Low Oxygen ◽  
Ignition And Combustion ◽  
Oxygen Mole Fraction

scholarly journals Effects of Injection Conditions and Oxygen Mole Fraction on Ignition Process of a Fuel Spray

2003 ◽  
Vol 2003.78 (0) ◽  
pp. _3-53_-_3-54_
Author(s):  
Tsunenari FUTAGI ◽  
Takuji ISHIYAMA ◽  
Masahiro SHIOJI ◽  
Tadayoshi IHARA ◽  
Hideaki NAKANO
Keyword(s):  
Mole Fraction ◽  
Fuel Spray ◽  
Ignition Process ◽  
Oxygen Mole Fraction

scholarly journals Surface tension of liquid Ti with adsorbed oxygen and a simple associate model for its prediction

2020 ◽  
Vol 49 (1-2) ◽  
pp. 89-105 ◽  
Author(s):  
J. BRILLO ◽  
J. WESSING ◽  
H. KOBATAKE ◽  
H. FUKUYAMA
Keyword(s):  
Experimental Data ◽  
Surface Tension ◽  
Simple Model ◽  
Chemical Analysis ◽  
Mole Fraction ◽  
Tio2 Powder ◽  
Bulk Oxygen ◽  
Electromagnetically Levitated ◽  
Oxygen Mole Fraction ◽  
Good Agreement

Surface tensions of electromagnetically levitated liquid Ti-samples were measured under the influence of oxygen. For this purpose, Ti-O samples were prepared by adding different amounts of TiO2 powder to pure Ti. The surface tension was found to strongly depend on the bulk oxygen mole fraction determined by chemical analysis. The results could be described by a simple model presented in the present work. In this model the Butler equation is applied and the formation of TiO2 – associates are taken into account. Non-ideal interactions ΔH≠0 between titanium and the associates also need to be taken into account. Good agreement with the experimental data is evident and also with a different model developed earlier by us.

Comparative Study on Spray Auto-Ignition of Di-n-Butyl Ether and Diesel Blends at Engine-Like Conditions

2020 ◽  
Vol 143 (4) ◽  
Author(s):  
Yuanhang Guan ◽  
Wang Liu ◽  
Dong Han
Keyword(s):  
Heat Release ◽  
Oxygen Concentration ◽  
Pressure Rise ◽  
Fuel Spray ◽  
Release Rates ◽  
Butyl Ether ◽  
Auto Ignition ◽  
Ambient Oxygen ◽  
Ignition And Combustion ◽  
Oxygen Concentrations

Abstract Di-n-butyl ether (DBE), a promising lignocellulosic biofuel, has been suggested as a potential alternative fuel for compression ignition engines. In this study, the spray auto-ignition characteristics of diesel/DBE blends were experimentally measured on a constant volume combustion chamber. Time-resolved pressure traces and heat release rates in fuel spray combustion were measured at changed fuel blending fractions, ambient temperatures, and oxygen concentrations. Further, ignition delay and combustion delay that evaluates fuel spray ignition tendency were derived and compared for different test blends. Experimental results indicated that fuel spray ignition tendency is promoted with DBE addition, evidenced by the advanced pressure rise and heat release processes, and the shortened ignition and combustion delays. Peak heat release rates are fuel-dependent at high ambient oxygen concentrations since the relative fractions of the premixed and diffusive burns alter with changed DBE addition. However, as the oxygen concentration drops to 11%, fuel effects on the peak heat release rates become less noticeable. Reduced ambient oxygen concentration effectively extends fuel ignition and combustion delays, and typical two-stage pressure rises and heat releases are observed for all test blends, as the oxygen concentration drops to 11%.

scholarly journals Ignition and combustion characteristics of wall-impinged kerosene (RP-3) fuel spray with varying injection parameters

2020 ◽  
Vol 24 (1 Part A) ◽  
pp. 171-181
Author(s):  
Wei Du ◽  
Qiankun Zhang ◽  
Meng Li ◽  
Jinchi Hou
Keyword(s):  
High Speed ◽  
Ignition Delay Time ◽  
Injection Pressure ◽  
Combustion Characteristics ◽  
Fuel Spray ◽  
Injection Parameters ◽  
Combustion Duration ◽  
Main Emphasis ◽  
Ignition And Combustion ◽  
Engine Condition

The fuel quantity and injection pressure are two essential factors to optimize the injection strategy. In this paper, we focus on the investigation for the ignition and combustion characteristics of wall-impinged kerosene (RP-3) fuel spray at different injection quantities and pressures. Experiments are conducted in a constant volume combustion vessel to simulate the Diesel engine condition, adopting a single-hole nozzle with 0.22 mm. The flame images are captured using a high-speed camera, and then the behaviors of ignition and combustion are processed and analyzed. The main emphasis is placed on the variation laws of the ignition position distance, the ignition delay time, the combustion duration, the flame area, spatially integrated natural luminosity and time integrated natural luminosity.

A Model of CoO Oxidation

1993 ◽  
Vol 58 (12) ◽  
pp. 2853-2866
Author(s):  
Marcela Tkadlecová
Keyword(s):  
Experimental Data ◽  
Temperature Dependence ◽  
Mole Fraction ◽  
Rate Constant ◽  
Surface Reaction ◽  
Energy Of Activation ◽  
The Given ◽  
Oxygen Mole Fraction

A model of CoO oxidation was proposed which assumes the diffusion of cobalt atoms from the bulk of crystalline to its surface and the surface reaction of these atoms with surrounding oxygen. It depends on the comparison of expressions D/a20 and kxox/a0 to what extent these two processes will manifest themselves for the given temperature and oxygen mole fraction xox. The value of diffusivity D and its temperature dependence were estimated from the data in literature and the size of crystallites a0 from roentgenographic measurements. The value of rate constant of surface reaction k and its energy of activation were evaluated from experimental data for CoO oxidation.

Modeling of Auto-Ignition and Combustion Processes for Dual-Component Fuel Spray

2011 ◽  
Vol 4 (2) ◽  
pp. 2193-2206 ◽  
Author(s):  
Yoshimitsu Kobashi ◽  
Kenta Fujimori ◽  
Hiroki Maekawa ◽  
Satoshi Kato ◽  
Daisuke Kawano ◽  
...  
Keyword(s):  
Fuel Spray ◽  
Auto Ignition ◽  
Ignition And Combustion ◽  
Combustion Processes
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