High-temperature laminar flame speed measurements in a shock tube

2019 ◽  
Vol 205 ◽  
pp. 241-252 ◽  
Author(s):  
Alison M. Ferris ◽  
Adam J. Susa ◽  
David F. Davidson ◽  
Ronald K. Hanson
Keyword(s):  
High Temperature ◽  
Shock Tube ◽  
Laminar Flame ◽  
Flame Speed ◽  
Laminar Flame Speed

Calculation of Laminar Flame Speed and Autoignition Delay at High Temperature and Pressures

2013 ◽  
Author(s):  
Hui Xu ◽  
Leon A. LaPointe
Keyword(s):  
High Temperature ◽  
Relative Humidity ◽  
Laminar Flame ◽  
Engine Performance ◽  
Simulation Software ◽  
Flame Speed ◽  
Laminar Flame Speed ◽  
Gaseous Fuels ◽  
Wide Range ◽  
Engine Development

Recent developments in emissions regulations, costs of conventional fuels, and new gas extraction drilling technologies have resulted in an increased emphasis in gaseous fueled spark ignited engine development. However the composition of gaseous fuels can vary greatly. Homogenous Charge Spark Ignited (HCSI) engine performance is heavily dependent upon fuel properties, and robust engine design to utilize gaseous fuels must accommodate these fuel property variances. Accurate prediction of fuel energy release characteristics and knock tendency is critical in the process of HCSI engine development. Combustion characteristics, such as Laminar Flame Speed (LFS) and Autoignition Interval (AI), are used to characterize performance of various gaseous fuels in HCSI engine applications. Combustion duration is related to the LFS. The likelihood of Knock is related to the AI. Overall engine performance is estimated by appropriately incorporating these parameters into cycle simulation software. Experimental data of LFS is often at low temperature and low pressure and thus does not represent the high temperature and pressure conditions typically prevalent in HCSI engine combustion chambers at the time of ignition. Lack of reliable LFS data at high temperature and pressures represents a major opportunity of development for better engine performance simulations [1]. In this paper, the commercially available chemical kinetics solver Chemkin Pro using an appropriate mechanism was employed to compute LFS and AI at typical HCSI engine in-cylinder conditions. It is challenging to compute LFS at such extreme conditions mainly because of autoignition as a competing process. This paper describes development of a robust methodology to compute LFS over a wide range of Temperature (up to 1300 K), Pressure (up to 250 bar), Relative Humidity, and Lambda for Methane. A regression for LFS with Pressure, Temperature, Lambda, and Relative Humidity as independent variables was generated for Methane. Methodology robustness was suggested with similar LFS calculations using other fuels. The form of the regression is similar for all of the fuels investigated.

A Numerical Study on the Reactivity of Biogas/Reformed-Gas/Air and Methane/Reformed-Gas/Air Mixtures at Gas Turbine Relevant Conditions

2016 ◽  
Author(s):  
Pablo Diaz Gomez Maqueo ◽  
Philippe Versailles ◽  
Gilles Bourque ◽  
Jeffrey M. Bergthorson
Keyword(s):  
Gas Turbine ◽  
Laminar Flame ◽  
Numerical Study ◽  
Flame Temperature ◽  
Flame Speed ◽  
Flame Stability ◽  
Laminar Flame Speed ◽  
Fuel Reforming ◽  
Numerical Work ◽  
Chemical Effects

This study investigates the increase in methane and biogas flame reactivity enabled by the addition of syngas produced through fuel reforming. To isolate thermodynamic and chemical effects on the reactivity of the mixture, the burner simulations are performed with a constant adiabatic flame temperature of 1800 K. Compositions and temperatures are calculated with the chemical equilibrium solver of CANTERA® and the reactivity of the mixture is quantified using the adiabatic, freely-propagating premixed flame, and perfectly-stirred reactors of the CHEMKIN-Pro® software package. The results show that the produced syngas has a content of up to 30 % H2 with a temperature up to 950 K. When added to the fuel, it increases the laminar flame speed while maintaining a burning temperature of 1800 K. Even when cooled to 300 K, the laminar flame speed increases up to 30 % from the baseline of pure biogas. Hence, a system can be developed that controls and improves biogas flame stability under low reactivity conditions by varying the fraction of added syngas to the mixture. This motivates future experimental work on reforming technologies coupled with gas turbine exhausts to validate this numerical work.

An experimental and reduced modeling study of the laminar flame speed of jet fuel surrogate components

Fuel ◽  
2013 ◽  
Vol 113 ◽  
pp. 586-597 ◽  
Author(s):  
J.D. Munzar ◽  
B. Akih-Kumgeh ◽  
B.M. Denman ◽  
A. Zia ◽  
J.M. Bergthorson
Keyword(s):  
Laminar Flame ◽  
Jet Fuel ◽  
Flame Speed ◽  
Laminar Flame Speed ◽  
Reduced Modeling ◽  
Fuel Surrogate ◽  
Modeling Study

Laminar flame speed measurements of dimethyl ether in air at pressures up to 10atm

Fuel ◽  
2011 ◽  
Vol 90 (1) ◽  
pp. 331-338 ◽  
Author(s):  
Jaap de Vries ◽  
William B. Lowry ◽  
Zeynep Serinyel ◽  
Henry J. Curran ◽  
Eric L. Petersen
Keyword(s):  
Dimethyl Ether ◽  
Laminar Flame ◽  
Flame Speed ◽  
Laminar Flame Speed

Laminar flame speed correlations for methane, ethane, propane and their mixtures, and natural gas and gasoline for spark-ignition engine simulations

2017 ◽  
Vol 18 (9) ◽  
pp. 951-970 ◽  
Author(s):  
Riccardo Amirante ◽  
Elia Distaso ◽  
Paolo Tamburrano ◽  
Rolf D Reitz
Keyword(s):  
Natural Gas ◽  
Laminar Flame ◽  
Spark Ignition ◽  
Flame Speed ◽  
Operating Conditions ◽  
Spark Ignition Engine ◽  
Computational Time ◽  
Laminar Flame Speed ◽  
Spark Ignition Engines ◽  
Empirical Correlations

The laminar flame speed plays an important role in spark-ignition engines, as well as in many other combustion applications, such as in designing burners and predicting explosions. For this reason, it has been object of extensive research. Analytical correlations that allow it to be calculated have been developed and are used in engine simulations. They are usually preferred to detailed chemical kinetic models for saving computational time. Therefore, an accurate as possible formulation for such expressions is needed for successful simulations. However, many previous empirical correlations have been based on a limited set of experimental measurements, which have been often carried out over a limited range of operating conditions. Thus, it can result in low accuracy and usability. In this study, measurements of laminar flame speeds obtained by several workers are collected, compared and critically analyzed with the aim to develop more accurate empirical correlations for laminar flame speeds as a function of equivalence ratio and unburned mixture temperature and pressure over a wide range of operating conditions, namely [Formula: see text], [Formula: see text] and [Formula: see text]. The purpose is to provide simple and workable expressions for modeling the laminar flame speed of practical fuels used in spark-ignition engines. Pure compounds, such as methane and propane and binary mixtures of methane/ethane and methane/propane, as well as more complex fuels including natural gas and gasoline, are considered. A comparison with available empirical correlations in the literature is also provided.

Measurement of Laminar Flame Speed and Flammability Limits of a Biodiesel Surrogate

2016 ◽  
Vol 30 (10) ◽  
pp. 8737-8745 ◽  
Author(s):  
Carlos A. Gomez Casanova ◽  
Edwin Othen ◽  
John L. Sorensen ◽  
David B. Levin ◽  
Madjid Birouk
Keyword(s):  
Laminar Flame ◽  
Flame Speed ◽  
Laminar Flame Speed ◽  
Flammability Limits

Influence of water vapour and tar compound on laminar flame speed of gasified biomass gas

2012 ◽  
Vol 98 ◽  
pp. 114-121 ◽  
Author(s):  
Nur Farizan Munajat ◽  
Catharina Erlich ◽  
Reza Fakhrai ◽  
Torsten H. Fransson
Keyword(s):  
Water Vapour ◽  
Laminar Flame ◽  
Flame Speed ◽  
Laminar Flame Speed ◽  
Influence Of Water
Sign in / Sign up

Export Citation Format

Share Document