Ignition delay times of conventional and alternative fuels behind reflected shock waves

2015 ◽  
Vol 35 (1) ◽  
pp. 241-248 ◽  
Author(s):  
Yangye Zhu ◽  
Sijie Li ◽  
David F. Davidson ◽  
Ronald K. Hanson
Keyword(s):  
Shock Waves ◽  
Ignition Delay ◽  
Alternative Fuels ◽  
Reflected Shock ◽  
Ignition Delay Times ◽  
Delay Times

Low hydrocarbon mixtures ignition delay times investigation behind reflected shock waves

Shock Waves ◽  
2002 ◽  
Vol 11 (4) ◽  
pp. 309-322 ◽  
Author(s):  
N. Lamoureux ◽  
C.-E. Paillard ◽  
V. Vaslier
Keyword(s):  
Shock Waves ◽  
Ignition Delay ◽  
Hydrocarbon Mixtures ◽  
Reflected Shock ◽  
Ignition Delay Times ◽  
Delay Times

Ignition delay times of very-low-vapor-pressure biodiesel surrogates behind reflected shock waves

Fuel ◽  
2014 ◽  
Vol 126 ◽  
pp. 271-281 ◽  
Author(s):  
Matthew F. Campbell ◽  
David F. Davidson ◽  
Ronald K. Hanson
Keyword(s):  
Shock Waves ◽  
Vapor Pressure ◽  
Ignition Delay ◽  
Reflected Shock ◽  
Ignition Delay Times ◽  
Delay Times

An Experimental and Modelling Study of Ignition Delays in Shock-Heated Ethane-Oxygen-Argon Mixtures Inhibited by 2H-Heptafluoropropane

2001 ◽  
Vol 215 (8) ◽  
Author(s):  
K. Ikeda ◽  
J.C. Mackie
Keyword(s):  
Shock Waves ◽  
Ignition Delay ◽  
Kinetic Modelling ◽  
Pressure Rise ◽  
Reflected Shock ◽  
Ignition Delay Times ◽  
Delay Times ◽  
Modelling Study

Ignition delay times have been measured behind reflected shock waves in ethane-oxygen-argon mixtures at temperatures between 1150 and 1500 K and pre-ignition pressures between 10 and 14 atm. Delay times have been measured both by pressure rise and OH absorption at 307 nm. Kinetic modelling of the ignition delays has been made using the GRIMech 3.0 mechanism which with addition of several reactions involving HO

Ignition delay times of methyl oleate and methyl linoleate behind reflected shock waves

2013 ◽  
Vol 34 (1) ◽  
pp. 419-425 ◽  
Author(s):  
M.F. Campbell ◽  
D.F. Davidson ◽  
R.K. Hanson ◽  
C.K. Westbrook
Keyword(s):  
Methyl Oleate ◽  
Methyl Linoleate ◽  
Shock Waves ◽  
Ignition Delay ◽  
Reflected Shock ◽  
Ignition Delay Times ◽  
Delay Times

Study on the Effects of Hydrogen Addition on Ignition Delay of Surrogate Fuel for RP-3 Kerosene

2014 ◽  
Vol 1070-1072 ◽  
pp. 549-552
Author(s):  
Yu Liu ◽  
Wen Zeng ◽  
Hong An Ma ◽  
Kang Yao Deng
Keyword(s):  
Ignition Delay ◽  
Alternative Fuels ◽  
Volume Fraction ◽  
Aviation Industry ◽  
Promising Alternative ◽  
The Sustainable Development ◽  
Hydrogen Addition ◽  
Ignition Delay Times ◽  
Delay Times ◽  
Surrogate Fuel

In order to reduce the emission and realize the sustainable development in aviation industry, looking for alternative fuel as kerosene has become more and more important. Hydrogen is regarded as one of the most promising alternative fuels. In our study RP-3 kerosene with hydrogen addition is used as the alternative kerosene. A RP-3 kerosene surrogate includes n-decane, toluene and propyl cyclohexane (volume fraction is 0.65/0.1/0.25) was chosen and the ignition delay times are calculated in CHEMKIN-PRO, it is found that hydrogen addition can shorten ignition delay.

DME as a Potential Alternative Fuel for Gas Turbines: A Numerical Approach to Combustion and Oxidation Kinetics

2011 ◽  
Author(s):  
Pierre A. Glaude ◽  
Rene´ Fournet ◽  
Roda Bounaceur ◽  
Michel Molie`re
Keyword(s):  
Natural Gas ◽  
Gas Turbine ◽  
Heat Input ◽  
Ignition Delay ◽  
Gas Turbines ◽  
Ignition Temperature ◽  
Alternative Fuels ◽  
Ignition Delay Times ◽  
Auto Ignition ◽  
Delay Times

Many investigations are currently carried out in order to reduce CO2 emissions in power generation. Among alternative fuels to natural gas and gasoil in gas turbine applications, dimethyl ether (DME; formula: CH3-O-CH3) represents a possible candidate in the next years. This chemical compound can be produced from natural gas or coal/biomass gasification. DME is a good substitute for gasoil in diesel engine. Its Lower Heating Value is close to that of ethanol but it offers some advantages compared to alcohols in terms of stability and miscibility with hydrocarbons. While numerous studies have been devoted to the combustion of DME in diesel engines, results are scarce as far as boilers and gas turbines are concerned. Some safety aspects must be addressed before feeding a combustion device with DME because of its low flash point (as low as −83°C), its low auto-ignition temperature and large domain of explosivity in air. As far as emissions are concerned, the existing literature shows that in non premixed flames, DME produces less NOx than ethane taken as parent molecular structure, based on an equivalent heat input to the burner. During a field test performed in a gas turbine, a change-over from methane to DME led to a higher fuel nozzle temperature but to a lower exhaust gas temperature. NOx emissions decreased over the whole range of heat input studied but a dramatic increase of CO emissions was observed. This work aims to study the combustion behavior of DME in gas turbine conditions with the help of a detailed kinetic modeling. Several important combustion parameters, such as the auto-ignition temperature (AIT), ignition delay times, laminar burning velocities of premixed flames, adiabatic flame temperatures, and the formation of pollutants like CO and NOx have been investigated. These data have been compared with those calculated in the case of methane combustion. The model was built starting from a well validated mechanism taken from the literature and already used to predict the behavior of other alternative fuels. In flame conditions, DME forms formaldehyde as the major intermediate, the consumption of which leads in few steps to CO then CO2. The lower amount of CH2 radicals in comparison with methane flames seems to decrease the possibility of prompt-NO formation. This paper covers the low temperature oxidation chemistry of DME which is necessary to properly predict ignition temperatures and auto-ignition delay times that are important parameters for safety.

Shockless Explosion Combustion: Experimental Investigation of a New Approximate Constant Volume Combustion Process

2016 ◽  
Author(s):  
Thoralf G. Reichel ◽  
Bernhard C. Bobusch ◽  
Christian Oliver Paschereit ◽  
Jan-Simon Schäpel ◽  
Rudibert King ◽  
...  
Keyword(s):  
Shock Waves ◽  
Ignition Delay ◽  
Gas Turbines ◽  
Control Algorithm ◽  
Ambient Pressure ◽  
Pressure Sensors ◽  
Constant Volume ◽  
Ignition Delay Times ◽  
Delay Times ◽  
Constant Volume Combustion

Approximate constant volume combustion (aCVC) is a promising way to achieve a step change in the efficiency of gas turbines. This work investigates a recently proposed approach to implement aCVC in a gas turbine combustion system: shockless explosion combustion (SEC). The new concept overcomes several disadvantages such as sharp pressure transitions, entropy generation due to shock waves, and exergy losses due to kinetic energy which are associated with other aCVC approaches like, e.g., pulsed detonation combustion. The combustion is controlled via the the fuel/air mixture distribution which is adjusted such that the entire fuel/air volume undergoes a spatially quasi-homogeneous autoignition. Accordingly, no shock waves occur and the losses associated with a detonation wave are not present in the proposed system. Instead, a smooth pressure rise is created due to the heat release of the homogeneous combustion. An atmospheric combustion test rig is designed to investigate the autoignition behavior of relevant fuels under intermittent operation, currently up to a frequency of 2Hz. Application of OH*- and dynamic pressure sensors allows for a spatially- and time-resolved detection of ignition delay times and locations. Dimethyl ether (DME) is used as fuel since it exhibits reliable autoignition already at 920K mixture temperature and ambient pressure. First, a model-based control algorithm is used to demonstrate that the fuel valve can produce arbitrary fuel profiles in the combustion tube. Next, the control algorithm is used to achieve the desired fuel stratification, resulting in a significant reduction in spatial variance of the auto-ignition delay times. This proves that the control approach is a useful tool for increasing the homogeneity of the autoignition.

Ignition Delay Times of Syngas and Methane in sCO2 Diluted Mixtures for Direct-Fired Cycles

2019 ◽  
Author(s):  
Samuel Barak ◽  
Owen Pryor ◽  
Erik Ninnemann ◽  
Sneha Neupane ◽  
Xijia Lu ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Ignition Delay ◽  
High Pressures ◽  
Chemical Kinetic ◽  
Time Data ◽  
Fuel Loading ◽  
Supercritical Regime ◽  
Reflected Shock ◽  
Ignition Delay Times ◽  
Delay Times

Abstract In this study, a shock tube is used to investigate combustion tendencies of several fuel mixtures under high carbon dioxide dilution and high fuel loading. Individual mixtures of oxy-syngas and oxy-methane fuels were added to CO2 bath gas environments and ignition delay time data was recorded. Reflected shock pressures maxed around 100 atm, which is above the critical pressure of carbon dioxide in to the supercritical regime. In total, five mixtures were investigated within a temperature range of 1050–1350K. Ignition delay times of all mixtures were compared with predictions of two leading chemical kinetic computer mechanisms for accuracy. The mixtures included four oxy-syngas and one oxy-methane combinations. The experimental data tended to show good agreement with the predictions of literature models for the methane mixture. For all syngas mixtures though the models performed reasonably well at some conditions, predictions were not able to accurately capture the overall behavior. For this reason, there is a need to further investigate the discrepancies in predictions. Additionally, more data must be collected at high pressures to fully understand the chemical kinetic behavior of these mixtures to enable the supercritical CO2 power cycle development.

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