Experimental and Computational Study of n-Heptane Autoignition in a Direct-Injection Constant-Volume Combustion Chamber

Allen, James; Pitz, William J.; Fisher, Brian T.

doi:10.1115/1.4027194

Cited by 4 publications

(5 citation statements)

References 35 publications

(45 reference statements)

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“…Additional work in modeling the IQT as a 0D reactor for longer IDs across a wide range of conditions is currently underway. Other researchers (Baumgardner et al and Allen et al) have also had some success with modeling constant volume fuel ignition devices (fuel ignition tester and cetane ID 510) similar to the IQT as 0D reactors for investigating ignition kinetics of butanol, isooctane, and n -heptane.…”

Section: Resultsmentioning

confidence: 99%

Experiments and Computational Fluid Dynamics Modeling Analysis of Large n-Alkane Ignition Kinetics in the Ignition Quality Tester

Bogin¹,

Osecky²,

Chen

et al. 2014

Energy Fuels

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This paper presents experimental measurements of ignition delays from low-to high-volatility n-alkanes representative of diesel and jet fuel compounds that are supplemented with a computational fluid dynamics (CFD) analysis. The ignition quality tester (IQT) is shown to be effective for studying ignition of low-volatility fuels, such as n-hexadecane, which are typically difficult to measure. Ignition delays, both experimental and modeled, are presented using an eight-point experimental design matrix (1.5 and 3.0 MPa, 823 and 723 K, and 15 and 21% O 2 ). A detailed n-alkane mechanism (C 8 −C 16 with a total of 2115 species) was reduced to a skeletal 237 species n-hexadecane mechanism using a targeted search algorithm. A CFD model of the IQT (developed using KIVA-3V) coupled with skeletal mechanisms predicted ignition delays of n-heptane and n-hexadecane with reasonable accuracy over the eight-point matrix, with the exception of the highest temperature, lowest pressure, and oxygen concentration conditions. Temperature sweeps across a range of pressures (0.1−1.0 MPa) and temperatures (673−973 K) were performed for n-heptane, n-decane, n-dodecane, and n-hexadecane. The negative temperature coefficient (NTC) region was observed experimentally for the first time for n-hexadecane. The NTC region for n-dodecane and n-decane has previously been observed in shock tubes and rapid compression machines and is reported here for the first time in the IQT. The IQT is thus capable of capturing NTC behavior for large alkanes and can serve as an additional experimental validation tool for chemical kinetic mechanisms of low-volatility surrogates for diesel and jet fuels.

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Section: Resultsmentioning

confidence: 99%

Experiments and Computational Fluid Dynamics Modeling Analysis of Large n-Alkane Ignition Kinetics in the Ignition Quality Tester

Bogin¹,

Osecky²,

Chen

et al. 2014

Energy Fuels

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“…Figure a shows that there is a good agreement between the FIT and IQT ignition delay times. However, the results of Allen et al are at variance with both the FIT and IQT data. This comparison suggests that the FIT behaves more like the IQT and not the constant volume combustion chamber (CVCC) of Allen et al Similar comparative results for n -butanol are presented in Figure b.…”

Section: Resultsmentioning

confidence: 99%

“…However, the results of Allen et al are at variance with both the FIT and IQT data. This comparison suggests that the FIT behaves more like the IQT and not the constant volume combustion chamber (CVCC) of Allen et al Similar comparative results for n -butanol are presented in Figure b. The n -butanol results from the study of Hou et al are significantly faster than the current FIT data.…”

Section: Resultsmentioning

confidence: 99%

“…The simplest approach of carrying out homogeneous constant volume reactive simulations was adopted. A previous study with direct injection into a constant volume combustion chamber by Allen et al concluded that a homogeneous combustion model was reasonably accurate for ignition delays greater than 5 ms. Similarly, Bogin et al .…”

Section: Experimental Methodsmentioning

confidence: 99%

“…The development and validation of comprehensive reaction mechanisms is supported by fundamental experimental data from diverse, well-characterized experiments, which are complementary in nature and cover a wide range of thermophysical conditions. Such experiments that have been conducted with n -butanol include shock tubes, − laminar nonpremixed flames, − outwardly propagating flames, − steady premixed flames, ,− jet stirred reactors, ,− rapid compression machines, − and constant volume combustion chambers − like the Fuel Ignition Tester (FIT) and Ignition Quality Tester (IQT). − Besides these fundamental experiments, theoretical studies concerning the chemical kinetics of n -butanol combustion have also been carried out. These include the thermochemistry of species relevant to n -butanol combustion, rate constants for hydrogen abstraction by radicals at different carbon atom sites, , and the decomposition kinetics of butanol derived radicals .…”

Section: Introductionmentioning

confidence: 99%

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Influence of Blending n-Butanol with Isooctane and n-Heptane on Ignition Delay Times in a Fuel Ignition Tester

Leathers

Savage

et al. 2018

Energy Fuels

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Experimental results on the ignition delay trends of n-heptane, isooctane, n-butanol, and the binary blends of n-butanol/n-heptane and n-butanol/isooctane are reported. Fuel sprays were injected into a quiescent, pressurized, and preheated air in a constant volume combustion chamber using the Waukesha Fuel Ignition Tester. The averaged initial oxidizer pressure and temperature were 24 bar and 812 K, respectively. The fuel injection duration was held constant at 5.0 ms. The results were used to obtain the dependence of the derived cetane number (DCN) on the volumetric fuel blending ratios. A monotonic, nonlinear reduction in reactivity of both n-heptane and isooctane was observed when blended with n-butanol, while a larger change in DCNs was observed for n-butanol/n-heptane blends than that for n-butanol/isooctane blends. The temperature dependence of the ignition delay times for the three neat fuel constituents were also obtained. Both first stage and overall ignition delay times are reported. In addition, global equivalence ratios were derived from exhaust gas composition measurements. Furthermore, the experimental ignition delay results of the blends and temperature dependence studies were compared to homogeneous zero-dimensional simulations based on the corresponding global equivalence ratios. Chemical kinetic models validated for autoignition of the aforementioned neat fuels and their blends were used in the simulations. The simulations indicate that homogeneous kinetics performs well for cases with long ignition delay times and also for a fuel exhibiting only single-stage ignition. This study provides insights into the influence of n-butanol blending on ignition delay time and emissions, and it provides information regarding the autoignition response of the pure fuel components for varying oxidizer temperatures.

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Shock tube study of normal heptane first-stage ignition near 3.5 atm

Campbell

Wang

Davidson

et al. 2018

Combustion and Flame

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Experimental and Computational Study of n-Heptane Autoignition in a Direct-Injection Constant-Volume Combustion Chamber

Cited by 4 publications

References 35 publications

Experiments and Computational Fluid Dynamics Modeling Analysis of Large n-Alkane Ignition Kinetics in the Ignition Quality Tester

Experiments and Computational Fluid Dynamics Modeling Analysis of Large n-Alkane Ignition Kinetics in the Ignition Quality Tester

Influence of Blending n-Butanol with Isooctane and n-Heptane on Ignition Delay Times in a Fuel Ignition Tester

Shock tube study of normal heptane first-stage ignition near 3.5 atm

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