scholarly journals Single Droplet Combustion Characteristics of Petroleum Diesel- Philippine Tung Biodiesel Blends

2021 ◽  
Vol 18 (24) ◽  
pp. 1409
Author(s):  
Nurkholis Hamidi ◽  
Joko Nugroho
Keyword(s):  
Burning Rate ◽  
Ignition Delay ◽  
Delay Time ◽  
Ignition Delay Time ◽  
Ambient Pressure ◽  
Flame Temperature ◽  
Combustion Characteristics ◽  
Chamber Pressure ◽  
Droplet Combustion ◽  
Fuel Blends

The purpose of the present study is to investigate the effects of fuel blending of petroleum diesel and biodiesel made from Philippine Tung on the combustion characteristics of fuel droplets. In this study, petroleum diesel was mixed with biodiesel at volume percentages of 0 to 100 % to produce 5 fuel blends. The ratios of fuel blends (petroleum volume/biodiesel volume) were 100:0 (P100), 75:25 (BP25), 50:50 (BP50), 25:75 (BP75) and 0:100 (B100). Single droplet combustion experiments were prepared to understand the combustion characteristics at 3 levels of ambient pressure (100, 200 and 300 kPa). Observations were carried out on the ignition delay time, the burning rate constant, droplet temperature, and the flame visualization. The results showed some effects of the adding of biodiesel in petroleum diesel and the chamber pressure on droplet combustion characteristics.  The adding of biodiesel into petroleum diesel resulted in a shorter ignition delay time and higher burning rate constants. But, the lower heating value of biodiesel caused the lower flame temperature. The possibility of micro-explosion also increased due to the mixing of fuel. On the other hand, increasing the chamber pressure also resulted in shorter ignition delay, higher burning rate, and higher combustion temperature. The higher ambient pressure also compressed the flame dimension and enhanced the onset of micro-explosion. HIGHLIGHTS The adding of biodiesel into petroleum diesel with different physical and chemical properties impacts the droplet combustion behavior, especially on the characteristics of burning rate, ignition delay time, flame temperature, and micro explosion The high content of unsaturated fatty acids and oxygen in Philippine Tung biodiesel improves the ignition delay time and burning rate constants of the blended fuel, but, the lower heating value causes the lower flame temperature The multi-components of fatty acids with different boiling points in Philippine Tung oil promote the micro-explosion in the combustion of the mixtures of biodiesel and petroleum diesel fuel GRAPHICAL ABSTRACT

scholarly journals UJI KARAKTERISTIK PEMBAKARAN HASIL DESTILASI KARET BEKAS-MINYAK DIESEL DENGAN MENGGUNAKAN DROPLET

JTAM ROTARY ◽  
2020 ◽  
Vol 1 (1) ◽  
pp. 1
Author(s):  
Aji Indra Hartono ◽  
Aqli Mursadin
Keyword(s):  
Burning Rate ◽  
Ignition Delay ◽  
Delay Time ◽  
Ignition Delay Time ◽  
Diesel Oil ◽  
Combustion Characteristics ◽  
Flash Point ◽  
Rubber Compound ◽  
Oil Droplet

This study aims to look at the combustion characteristics of destillates of used rubber and diesel oil using droplet, the characteristics observed were flash point, ignition delay time, burning rate, and visualization (hight) of fire. Variation in mix RCO 10%, 20%, 30%, 40%, 50%. The tool used is a tool designed by researchers. The result of the flash point study found that the highest velue was found in the mixture of RCO 10% which was 105,7oC and the lowest value was found in mixture of 50% which was 56,6oC. then the highest value of the ignition delay time is in the mixture of 10% which is 1,64 seconds and the lowest value in the mixture is 30% which is 0,98 seconds, then are result of the highest burning rate are found in the mixture 0f 40% which is 3,83 seconds and lowest value is mixed with 20% which is 3,1 second. Then the highest level of fire in the mixture of 10% is 82,3 mm and the lowest is in the mixture of 50% which is 73,2 mm. Keywords: Rubber Compound Oil, Droplet, Flash Point, Ignition Delay Time, Burning Rate

Experimental Study of Mass Burning Rate of Liquid Pool Fires Under Dynamic Pressure in an Altitude Chamber

2017 ◽  
Author(s):  
Zhenxiang Tao ◽  
Rui Yang ◽  
Cong Li ◽  
Yina Yao ◽  
Wei Wang
Keyword(s):  
Burning Rate ◽  
Dynamic Pressure ◽  
Ambient Pressure ◽  
Flame Temperature ◽  
Great Influence ◽  
Liquid Pool ◽  
Combustion Characteristics ◽  
Chamber Pressure ◽  
Pool Fires ◽  
Mass Burning Rate

To study the influence of dynamic pressure on the liquid combustion characteristics, two kind sizes of pool fires were studied under varied pressure rates, namely 100Pa/s, 200Pa/s, 300Pa/s from 90kPa to 38kPa in an altitude chamber which size is 2m*3m*4.65m. Combustion characteristics of n-heptane pool fires, such as mass burning rate, flame temperature, chamber pressure were measured in this research. Experiment results show that the mass burning rate of 20cm pool fires, decreases when the ambient pressure reduces, and the variation trend become more sharply when the dynamic pressure rate is increased, while 30cm pool fires at the beginning of the combustion stage almost remain constant, this is because fire heat feedback have a great influence on it. The results also show that compared to the radiation model, pressure model could be linear fitting better in a double logarithm coordinate, and oil pool fires under 300Pa/s of 20cm, 100Pa/s of 30cm the value of α obtained by the fitted curves were more closer to fixed pressure ones.

scholarly journals Ignition delay time measurements of primary reference fuel blends

2017 ◽  
Vol 178 ◽  
pp. 205-216 ◽  
Author(s):  
Mohammed AlAbbad ◽  
Tamour Javed ◽  
Fethi Khaled ◽  
Jihad Badra ◽  
Aamir Farooq
Keyword(s):  
Ignition Delay ◽  
Delay Time ◽  
Ignition Delay Time ◽  
Fuel Blends ◽  
Primary Reference

scholarly journals Ignition and combustion of high-energy materials containing aluminum, boron and aluminum diboride

2018 ◽  
Vol 194 ◽  
pp. 01055
Author(s):  
Alexander Korotkikh ◽  
Ivan Sorokin ◽  
Ekaterina Selikhova
Keyword(s):  
Burning Rate ◽  
Ignition Delay ◽  
Delay Time ◽  
Solid Propellant ◽  
Ignition Delay Time ◽  
High Energy ◽  
Solid Propellants ◽  
Amorphous Boron ◽  
Aluminum Diboride ◽  
Ignition And Combustion

Boron and its compounds are among the most promising metal fuel components to be used in solid propellants for solid fuel rocket engine and ramjet engine. Papers studying boron oxidation mostly focus on two areas: oxidation of single particles and powders of boron, as well as boron-containing composite solid propellants. This paper presents the results of an experimental study of the ignition and combustion of the high-energy material samples based on ammonium perchlorate, ammonium nitrate, and an energetic combustible binder. Powders of aluminum, amorphous boron and aluminum diboride, obtained by the SHS method, were used as the metallic fuels. It was found that the use of aluminum diboride in the solid propellant composition makes it possible to reduce the ignition delay time by 1.7–2.2 times and significantly increase the burning rate of the sample (by 4.8 times) as compared to the solid propellant containing aluminum powder. The use of amorphous boron in the solid propellant composition leads to a decrease in the ignition delay time of the sample by a factor of 2.2–2.8 due to high chemical activity and a difference in the oxidation mechanism of boron particles. The burning rate of this sample does not increase significantly.

NEPE Propellant Ignition and Combustion under Laser Irradiation

2014 ◽  
Vol 1042 ◽  
pp. 10-14 ◽  
Author(s):  
Hong Mei Wang ◽  
Xiong Chen ◽  
Chao Zhao
Keyword(s):  
Heat Flux ◽  
Laser Irradiation ◽  
Ignition Delay ◽  
Delay Time ◽  
Ignition Delay Time ◽  
Flame Temperature ◽  
Heat Fluxes ◽  
Short Delay ◽  
Laser Heat ◽  
Nepe Propellant

An experimental study was conducted to get the ignitibility of NEPE propellant under different CO2 laser heat fluxes. The combustion flame temperature distribution of NEPE propellant was measured using an infrared thermometer. Results show that the ignition delay time tends to decrease with the increase of laser heat flux, and there exists a significant value. The ignition delay time decreases fast when the heat flux is less than this value, but varies little when the heat flux is greater than this value. Laser irradiation had a significant effect on the combustion of NEPE propellant and after the laser unloading, the flame temperature of the propellant dose not decline immediately, but fall rapidly after a short delay.

scholarly journals Numerical Investigation of Combustion Characteristics of a Wave Rotor Combustor Based on a Reduced Reaction Mechanism of Ethylene

2018 ◽  
Vol 2018 ◽  
pp. 1-21 ◽  
Author(s):  
Jianzhong Li ◽  
Li Yuan ◽  
Wei Li ◽  
Kaichen Zhang
Keyword(s):  
Reaction Mechanism ◽  
Flame Propagation ◽  
Ignition Delay ◽  
Delay Time ◽  
Ignition Delay Time ◽  
Pressure Rise ◽  
Combustion Characteristics ◽  
Wave Rotor ◽  
Elementary Reactions ◽  
Coupling Time

To improve simulations of the flame and pressure wave propagation process and investigate the combustion characteristics of a wave rotor combustor (WRC), direct relation graphs with error propagation (DRGEP), quasi-steady-state assumption (QSSA), and sensitivity analysis were used to establish a reduced reaction mechanism comprised of 23 species and 55 elementary reactions, based on the LLNL N-Butane mechanism. The reduced reaction mechanism of ethylene was combined with an eddy dissipation concept (EDC) model to simulate the flame propagation characteristics in a simplified WRC channel. The effects of spoilers with different blockage ratios and hot-jets of different species on combustion characteristics of flame propagation and pressure rise in the WRC channel were investigated. When the heated inert air was used as hot-jet, the ignition delay time of WRC would increase, which indicated that the activity of the burned gas from the hot-jet igniter would affect the ignition delay time. The spoiler facilitates the coupling of flame and shock waves to reduce the coupling time and distance. With the blockage ratio of the spoiler increasing, the coupling time and distance would be reduced.

Understanding the Effect of Oxygenated Biofuels Addition on Combustion Characteristics of Gasoline

2018 ◽  
Author(s):  
Shrabanti Roy ◽  
Saeid Zare ◽  
Omid Askari
Keyword(s):  
Ignition Delay ◽  
Delay Time ◽  
Equivalence Ratio ◽  
Ignition Delay Time ◽  
Combustion Characteristics ◽  
Wide Range ◽  
Oxygenated Fuels ◽  
Laminar Burning Speed

The change in laminar burning speed and ignition delay time of iso-octane with the addition of oxygenated fuels are investigated. As oxygenated fuels, ethanol and 2,5 dimethyle furan (DMF) are used. To confirm the process and mechanism a detailed validation is done on laminar burning speed and ignition delay time. Further, three different blending ratios of 5%, 25% and 50% for both ethanol/iso-octane and DMF/iso-octane are investigated separately. Wide range of equivalence ratio from 0.6–1.4 is considered in calculating laminar burning speed. Ignition delay time is measured under various temperatures from 650 K to 1100 K. Results of each blending are compared with the pure fuels. A comparison is also done between the effects of these two oxygenates. It has found that for each blending case presence of DMF brings larger change in the behavior of iso-octane than ethanol. This observation refers to further study on comparison of these two oxygenates.

The Kinetic Model Including Singlet Oxygen and Ozone in Hydrogen-Air Mixture

2013 ◽  
Vol 772 ◽  
pp. 239-245
Author(s):  
Yan Nan Chang ◽  
Chang Hui Wang ◽  
Tong Guang Cheng
Keyword(s):  
Experimental Data ◽  
Kinetic Model ◽  
Singlet Oxygen ◽  
Ignition Delay ◽  
Delay Time ◽  
Ignition Delay Time ◽  
Flame Temperature ◽  
Combustion System ◽  
Basic Model ◽  
System A

To analysize the influence of singlet oxygen O2(a1Δg) and ozone O3on the hydrogen-air combustion system, a kinetic model must be defined. By simulating the ignition delay time, flame speed, flame temperature and the component changes of Starik model, GRI3.0 model, Konnov model and Mueller model using the software Chemkin4.1 and comparing the results with the experimental data, the Starik model is chosen as the basis of the study. Then singlet oxygen O2(a1Δg) and ozone O3is added in the basic model to form a new mechanism. The presence of singlet oxygen O2(a1Δg) and ozone O3is demonstrated to result in noticeable enhancement on flame propagation.

scholarly journals Research on Combustion Characteristics of Air–Light Hydrocarbon Mixing Gas

Processes ◽  
2020 ◽  
Vol 8 (6) ◽  
pp. 730 ◽  
Author(s):  
Zhiqun Meng ◽  
Jinggang Wang ◽  
Chuchao Xiong ◽  
Jiawen Qi ◽  
Liquan Hou
Keyword(s):  
Residence Time ◽  
Ignition Delay ◽  
Delay Time ◽  
Ignition Delay Time ◽  
Laminar Flame ◽  
Combustion Characteristics ◽  
Light Hydrocarbon ◽  
Laminar Flame Speed ◽  
Emission Index ◽  
Co Emission

Air–light hydrocarbon mixing gas is a new type of city gas which is composed of light hydrocarbon with the main component of n-pentane and air mixed in a certain proportion. To explore the dominant reactions for CO production of air–light hydrocarbon mixing gas with different mixing degrees at the critical equivalence ratios, a computational study was conducted on the combustion characteristics, including the ignition delay time, laminar flame speed, extinction residence time, and emission of air–light hydrocarbon mixing gas at atmospheric pressure and room temperature in the present study. The calculated results indicate that the ignition delay time of air–light hydrocarbon mixing gas at temperatures of 1000–1118 K is greater than that of n-pentane, while the opposite at temperatures of 1118–1600 K. From the study of the laminar flame speed and ignition delay time, it was found that the essence of air–light hydrocarbon mixing gas is that its attribute parameter is determined by the ratio of n-pentane to the total amount of air at the moment of combustion. The changes in the extinction residence time and the CO emission index of air–light hydrocarbon mixing gas are not synchronized, that is the CO emission index is not necessarily small for air–light hydrocarbon mixing gas with excellent extinction residence time. CO sensitivity analysis and CO rate of production identified key species and reactions that are primarily responsible for CO formation and annihilation. The mixing degree plays a key role in the CO emission index of air–light hydrocarbon mixing gas, which has a constructive opinion on the future experiment and application of air–light hydrocarbon mixing gas.

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