In this paper, FLUENT software coupled with the chemical reaction mechanism is used to study the ignition characteristics of methane-air mixtures at low temperature.
To investigate the ignition characteristics of ammonia-methanol blended fuel, ignition delay time measurement and fast gas sampling under stoichiometric conditions with four ammonia blending ratios (20 % ammonia, A20; 40 % ammonia, A40; 80 % ammonia, A80; 95 % ammonia, A95) were carried out on a rapid compression machine under engine-relevant ...
In order for an ignition source to ignite a material at its flash point temperature, the ignition source must be at the ignition temperature of the liquid. For example, if you placed gasoline in a container and used a lit cigarette to ignite the gasoline, you would be wasting your time. The temperature of a lit cigarette is around 400°F, and ...
The discharge characteristic tests and ignition characteristic experiments are conducted in NH 3 /air mixtures, with the excess air ratio (λ) maintained at λ = 1 and the initial temperature (T 0) at T 0 = 363 K. The discharge parameters employed in the experiments are presented in Table 1.
Auto-ignition temperature (AIT), defined as the lowest temperature at which the fuel can ignite in air at atmospheric pressure without the aid of external energy sources, is usually used in the fire risk assessment of liquid fuels [9, 10].
Ignition characteristics and temperature measurements for silane/N 2 Air opposed jet diffusion flames. Author links open overlay panel Seiichiro Koda, ... experimental investigations covering a wide range of release conditions to enable a full understanding of silane ignition and explosion characteristics.
investigated, including ignition probability and characteristic ignition temperature. It was found that the ignition of liquid fuel on the hot surface was probabilistic. The boil-over phenomenon was observed for transformer oil when the hot surface temperature was above 693 K, where the liquid fuel burned over the pan.
In this study, thermogravimetric analysis and hot surface tests were systematically conducted for some typical liquid fuels. In the hot surface tests, ignition parameters were …
Temperature Distribution 5.1.7. Heat Transfer Rate Dependencw e on f 5.1.8. Dependence ofw Dj ^ on f 5.2. Results of the Opposed-Jet Case ... The ignition characteristics of a combustible mixture in opposed flow with a hot inert gas have been considered. Two cases were studied: (i) a jet of a combustible mixture ...
It also conducts a mechanism analysis on the transient ignition characteristics under successful ignition conditions for both igniters, providing valuable references for future igniter design and engine performance enhancements. ... Fig. 8 illustrates the contours of temperature after ignition using two igniters at φ = 0.25, and the change in ...
The lowest ignition temperature and the highest ignition temperature of the hot surface are significantly negatively correlated with the oil volume. As the oil quantity increases from 0.1 mL to 0.5 mL, the minimum ignition temperature decreases from 370 °C to 312 °C, and the maximum ignition temperature decreases from 415 °C to 355 °C.
reaction temperature and the peak weight loss rate temper-ature.13 Liu et al., utilizing a temperature programming test system (TPTS), assessed the reignition process of noncaking coal subjected to water immersion and prior oxidation, subsequently calculating its self-ignition characteristics and low-temperature oxidation limit parameters.
Ignition temperatures of n-hexane, n-octane, n-decane, JP-6 jet fuel and aircraft engine oil MIL-L-7808 (0-60-18) were determined in air using heated Pyrex cylinders of 0.314-inch to 1.38-inch …
NISTIR89-3911 IGNITIONCHARACTERISTICSOFTHE NICKEL-BASEDALLOYUNSN07718 INPRESSURIZEDOXYGEN N JamesW.Bransford PhillipA.Billiard JamesA.Hurley KathleenM.McDermott ...
The coal ignition temperature and ignition characteristics are important factors for boiler design and for choosing the feeding temperature during the transition from air-firing to oxy-firing. The ...
Obtaining the temperature profile of fuel during combustion is essential. Fuel profiles with long ignition times prolong engine operation over a given fuel volume. This …
The temperature ranges from 778 K to 1035 K provided the full history of heat release rate during the reaction proceeding of T eoc = 770 K. It is observed that within the temperature range of 778 K to 984 K, the ignition mode was auto-ignition, in which maximum HRR increased from 1400 to 12,000 kW/cm 3 as the chemical reaction proceeds. The ...
The initial ignition characteristic of fuel spray in a diesel engine is of great significance in the cold start problem. In this paper, the constant volume combustion vessel was applied to simulate the practical diesel engine condition near the end of the compression stroke and investigate the autoignition threshold temperature and other ignition characteristics for the …
ignition characteristics of kerosene [11]. Vasu et al. used shock tubes to investigate the ignition characteristics of Jet-A and JP -8. The experimental pressure range was 1.7 -5.1 MPa, and the temperature range was 715-1229 K. but oxygen content is only 10% and 21% [12-15]. Korzhavin et al. studied the spread of oil film fire on metal plates
The ignition temperature was taken as the temperature at which these curves reached a value of 10%. Coal rank and particle size were found to influence the ignition temperatures of the coal and char particles. ... The influence of char rank on ignition behavior and characteristic temperature is shown in Table 3. All characteristic temperatures ...
Ignition Temperature is defined as the lowest temperature at which a material can ignite and sustain combustion without the need for a spark or flame. AI generated definition based on: …
The above studies have shown that the co-combustion of CH 4 /H 2 /NH 3 ternary fuel has significant potential as an alternative fuel for ICE and GT. To gain further insight into the fundamental combustion characteristics of the ternary combustion system, this study aims to measure the high-temperature ignition IDT of CH 4 /H 2 /NH 3 ternary fuel using an ST …
According to the test data of the minimum ignition temperature of the gas–liquid two-phase phase, the smaller the characteristic size of the cloud droplets, the lower the minimum ignition temperature. In the range of 10 0 –10 1 μm D 32, the test data show that the minimum ignition temperature increases linearly with the droplet size ...
Effect of ethanol on auto-ignition characteristics and laminar burning velocity of gasoline under elevated temperature and pressure. Author links open overlay panel Xun Wang a, ... Low temperature auto-ignition characteristics of methylcyclohexane/ethanol blend fuels: Ignition delay time measurement and kinetic analysis. Energy, 177 (2019), pp ...
In this work, the ignition characteristics of single particles of two biomass samples (CS, WS) and four coal samples (XM, IM, ... Experimental and theoretical analyses on ignition and surface temperature of dispersed coal particles in O 2/N 2 and O 2/CO 2 ambients. Fuel, 201 (2017), pp. 93-98. View PDF View article View in Scopus Google Scholar
Key words: Ignition characteristics; HSI; thermal mechanism; multi-factor influence; ship engine room fire ... temperature. Ignition height above the hot surface is studied by Bennett [10-11], the ...
Xu analyzed the re-ignition characteristics of high-temperature oxidized water-immersed coal samples and concluded that the pore diameter of high-temperature oxidized water-immersed coal samples was increased, which improved the …
Various marine fuels exhibit different ignition characteristics on high-temperature surfaces, and the time required for HSI has discrepancies. There are two basic prerequisites for the local ignition of marine fuel that has leaked onto a hot surface. One is a suitable ratio of fuel vapor/air in the ignition area, which can promote the formation ...
In this paper, the ignition and combustion characteristics of kerosene fueled supersonic combustor at low temperature were studied using hydrogen-guided flame ignition and no-support palate spark block and spark block with support block under the incoming flow condition of Ma = 2.0, total temperature 700 K and total pressure 520 kPa.
Ignition temperature of biomass is predictable via its chemical compounds. Abstract. Ignition behaviour of biomass is an essential knowledge for plant design and process control of biomass combustion. Understanding of ignition characteristics of its main chemical components, i.e. cellulose, hemicellulose, lignin and their mixtures will allow ...
Babrauskas et al. further established that hot surface ignition is probabilistic event, identifying a specific temperature range that defines two critical temperatures: the minimum …
The goal of this study was to propose a new method for determining the characteristic temperatures and acquire the criticality criteria and regions of ignition …
The increase of equivalent ratio increases the flame temperature after ignition. It increased the expansion of hot gases that promotes flame speed. ... To establish the coupling connection of the ignition characteristics between the multi-injector burner and the annular combustor. The flame propagation was investigated experimentally in a multi ...
Highly active metal fuels (Al, B) are used in explosives and propellants can enhance the energy density and combustion performance [1, 2].Boron (B) shows great potential applications due to high calorific value (58.28 kJ/g 136.38 kJ/cm 3), which is 1.9 and 1.66 times of Al [3, 4].However, it is limited by low combustion efficiency and long ignition delay time …
Large differences in ignition temperature (150 °C) can also be observed for biomass fuels with very similar volatile matter content. At the same time, fuels with lower volatile content (60–65 %) have the lowest ignition temperature (400–450 °C) which: •
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Experimental study on the spark ignition characteristics at elevated temperature and pressure under flow conditions. Author links open overlay panel Myoungsoo ... focusing on spark discharge energy and the shapes of spark channels. The pressure, temperature, and mean flow velocity conditions were independently controlled (up to 20 bar, 567 K ...
As for the temperature of the electrode, the larger current causes a higher electrode temperature. A semi-infinite solid ignition model is used to deal with the ignition process of the combustibles. Experimental results show that there is a good linear relationship between the current (I 2) and the ignition time (t ig − 1 / 2). This study ...
HF was reported capable of a pre-ignition reaction with alumina shell to produce AlF 3, whose sublimation in the high temperature region could help the aluminum core to participate in the oxidation reaction and thus promoted the ignition of μ-Al [29]. Meanwhile, it is supposed that the generated metal oxides are also capable of thermal ...