A method to determine ignition delay times for Diesel surrogate fuels from combustion in a constant volume bomb: Inverse Livengood–Wu method

Reyes, Miriam; Fluixá, Francisco V. Tinaut; Andrés, Celia; Pérez, Armando

doi:10.1016/j.fuel.2012.07.041

Cited by 20 publications

(7 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Petroleum researchers often formulate surrogate fuel mixtures in an effort to understand the combustion behavior of fuels containing a large number of components. Surrogates containing from one to 14 components have been formulated for petroleum-based and renewable diesel fuel and jet fuel and for rocket propellants. − Components of the fuel are used to develop formulations whose properties match those of the fuel of interest. Pitz and Mueller reported that the primary components that have been used in preparing diesel fuel surrogates are aromatic compounds, cycloalkanes, n -hexadecane (to represent n -alkanes), and isoalkanes.…”

Section: Introductionmentioning

confidence: 99%

Density, Viscosity, Speed of Sound, Bulk Modulus, Surface Tension, and Flash Point of Binary Mixtures of Butylcyclohexane with Toluene or n-Hexadecane

Prak

2016

J. Chem. Eng. Data

View full text Add to dashboard Cite

The viscosities and densities ((293.15 to 353.15) K), speeds of sound ((293.15 to 333.15) K), surface tensions (room temperature), and flash points were measured for binary mixtures of n-butylcyclohexane with either toluene or n-hexadecane. Increasing the temperature decreased the densities, and the excess molar volumes of the mixtures were generally positive, suggesting increased spacing due to differences in packing and intermolecular forces. Increasing the temperature also decreased the viscosities, and the McAllister three-body model successfully modeled the viscosity with the larger fitting term corresponding to two molecules of the more viscous substance. The mixture surface tensions and flash points fell between the pure-component values, which ranged from (26.7 to 28.6) mN•m −1 and (324.7 to 406.2) K, respectively. The speed of sound decreased with increasing mole fraction of n-butylcycylohexane in nhexadecane, but several speed of sound values for mixtures of n-butylcyclohexane and toluene were lower than those of either component. For both sets of mixtures, the isentropic bulk moduli of several mixtures were lower than those of their components. These results show that simple blending rules cannot be used to predict the speed of sound and bulk modulus of these mixtures.

show abstract

Section: Introductionmentioning

confidence: 99%

Density, Viscosity, Speed of Sound, Bulk Modulus, Surface Tension, and Flash Point of Binary Mixtures of Butylcyclohexane with Toluene or n-Hexadecane

Prak

2016

J. Chem. Eng. Data

View full text Add to dashboard Cite

show abstract

“…, where several runs of ignition delay, together with P ( t ) and T ( t ) history of each run, can be used in the inverse L‐W approach to extract the IDT as an explicit function of constant conditions, i.e., τ ( T , P ). A similar idea was also demonstrated by Reyes et al , where the authors tried to obtain the ignition delay under constant conditions based on spark‐ignition experiments conducted in a constant‐volume combustion bomb. However, their experimental data were largely biased by the low‐to‐intermediate temperature heat release and NTC, and there was insufficient vigor on the convergence of the algorithm they adopted.…”

Section: Introductionmentioning

confidence: 73%

On the Interpretation and Correlation of High‐Temperature Ignition Delays in Reactors with Varying Thermodynamic Conditions

Tao

Laich

Lynch

et al. 2018

Int J of Chemical Kinetics

View full text Add to dashboard Cite

Ignition delay time (IDT) is a useful global metric for fuel performance screening and a major target for kinetic modeling. Measurements of IDT are conceptually straightforward; however, interpretation could be complicated, especially for systems with changing temperature and pressure. Some experimental conditions in the high repetition rate miniature shock tube (HRRST) exhibit complex temperature and pressure state histories. To better interpret and correlate IDTs, especially those obtained in reactors with varying thermodynamic conditions, an inverse Livengood-Wu (L-W) integral technique is applied to deconvolve the constant condition IDTs from measured IDTs in the HRRST using information on the varying state history. In this paper, the approximate problem is demonstrated using only the measured pressure history

show abstract

“…Several authors have also recently proposed its use to predict the autoignition in HCCI or diesel engines 8–10 or to calculate the ignition delay (as a function of pressure and temperature) from the autoignition time obtained in constant volume combustion bomb. 11 It is clear that, even considering the great advances in the development of complex reaction mechanisms and CFD codes that allow the calculation of autoignition phenomena more accurately, the integral method will still keep being used when calculation time is a constraint, such as for control or on-line diagnostic purposes.…”

Section: Introductionmentioning

confidence: 99%

Autoignition prediction capability of the Livengood–Wu correlation applied to fuels of commercial interest

Hernández

Lapuerta

Sanz-Argent

2014

International Journal of Engine Research

View full text Add to dashboard Cite

The integral method proposed by Livengood and Wu has been traditionally used to predict the occurrence of knock on spark-ignition engines. Due to its simplicity and low computational demand, this is a method of great interest for the prediction of another autoignition phenomenon, such as the onset of combustion in compression ignition or homogeneous charged compression ignition engines. However, the simplicity of the method is a consequence of the restrictive assumptions considered during its development, which may limit the applicability of the equation. In this study, the validity of the correlation proposed by Livengood and Wu has been evaluated at different initial operative conditions under pure homogeneous charged compression ignition combustion mode for fuels with practical interest (hydrogen, methane, ethanol and n-heptane). The integral method has shown very good prediction capability for the fuels, which do not present two-stage heat release (hydrogen, methane and ethanol) except in those cases when the onset of combustion is very delayed. When cool flames appear (as in the case of n-heptane), the integral method overpredicts the autoignition times since it does not consider the first stage of heat release. In these cases, the prediction of the integral method may be improved if the whole combustion process is considered as two individual processes. This approach shows fairly good prediction capacity although it is unpractical since the simulation of the second-stage combustion requires the previous calculation of the composition of the mixture and the temperature increase at the end of the first stage. Finally, two alternatives to the original integral method are tested which keep its simplicity and universality while taking into account both first and second heat release, one of them showing better results than the original Livengood and Wu equation.

show abstract

A method to determine ignition delay times for Diesel surrogate fuels from combustion in a constant volume bomb: Inverse Livengood–Wu method

Cited by 20 publications

References 25 publications

Density, Viscosity, Speed of Sound, Bulk Modulus, Surface Tension, and Flash Point of Binary Mixtures of Butylcyclohexane with Toluene or n-Hexadecane

Density, Viscosity, Speed of Sound, Bulk Modulus, Surface Tension, and Flash Point of Binary Mixtures of Butylcyclohexane with Toluene or n-Hexadecane

On the Interpretation and Correlation of High‐Temperature Ignition Delays in Reactors with Varying Thermodynamic Conditions

Autoignition prediction capability of the Livengood–Wu correlation applied to fuels of commercial interest

Contact Info

Product

Resources

About