Species quantification during n-heptane autoignition using filtered natural emission of species

Piehl, J. A.; Abianeh, O. Samimi

doi:10.1016/j.fuel.2021.121563

Cited by 5 publications

(19 citation statements)

References 25 publications

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“…To remedy this discrepancy, an offset was applied to the timing of the temperature profile so that the timing of maximum temperature rise (i.e., maximum d T /d t , where T is temperature and t is time) coincided with the pressure rise associated with the first-stage ignition delay. While this offset does create a discrepancy between the temperature and pressure profiles at the second-stage ignition, the measured species concentrations exhibit atypical behaviors when the temperature rise at the second-stage ignition occurs after the pressure rise (as discussed in ref ). For this reason, the constrained pressure models with this correction were used to simulate the temperature profile for the tests in this work.…”

Section: Introductionmentioning

confidence: 84%

“…As shown in our previous works (refs and ), the 0D models are insufficient to explain the complex combustion phenomena that occur within the combustion chamber. As such, 3D simulations were performed to elucidate further details about the experiments.…”

Section: Introductionmentioning

confidence: 84%

“…ITHR reactions are more enhanced when an LTHR is present but is typically combined with the HTHR as the chemistry is attributed to alkyl peroxy radical chain branching, propagation, and termination . The works with the three-stage heat release (i.e., refs , ) differ from the multistage heat release reported in engines as three distinct heat releases are reported.…”

Section: Introductionmentioning

confidence: 99%

“…For some filters, the observed radiation was so intense that it saturated the camera’s sensor despite the transmission losses. This was documented in a previous study for the observation of CO 2 in particular . To observe the emissions throughout the combustion process, different broadband filters were used to reduce the emission intensity further.…”

Section: Introductionmentioning

confidence: 99%

“…The iterative FNES methodology has been described in detail in ref but will be briefly described herein. First, the measured emissions, pressure, and temperature data are aligned temporally to ensure accurate concentration measurements.…”

Section: Introductionmentioning

confidence: 99%

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Quantification of Three-Stage n-Pentane Autoignition Using Filtered Natural Emission of Species

Piehl

Abianeh

2022

Energy Fuels

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Multistage autoignition of n-pentane is investigated by measuring the filtered natural emissions of species (FNES). This technique was applied to quantify the concentrations of CO, CO2, and H2O during three distinct heat releases within a rapid compression machine at temperatures between 670 and 700 K and a pressure of 20.3 bar. The application of new filters enabled, for the first time, the quantification of CO, CO2, and H2O concentrations for the entirety of the combustion process using the FNES technique. The empirical data was compared to the simulated results in both zero-dimensional (0D) and three-dimensional (3D) numerical models. A detailed kinetic mechanism was reduced for application in the 3D model with minor loss of accuracy for the species of interest. The empirical CO data agreed well with the peak concentrations from the simulations, and the unique field of view of the FNES methodology observed a prolonged CO concentration due to spatial effects within the chamber. This measured data was captured with the 3D models but not the 0D models. The simulation was able to accurately predict the timing at which the CO2 concentration would appear in the combustion chamber. However, the simulation overpredicted the time it would take for the CO2 concentration to reach its steady-state value. Conversely, the measured H2O concentrations were higher than the simulated values.

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Section: Introductionmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Quantification of Three-Stage n-Pentane Autoignition Using Filtered Natural Emission of Species

Piehl

Abianeh

2022

Energy Fuels

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Optical diagnostics of pentane autoignition using corrected filtered natural emission of species (C-FNES) technique

Molana

Abianeh

2023

Journal of Quantitative Spectroscopy and Radiative Transfer

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Autoignition Characteristics of Ammonia Dimethyl Ether Blends

Goyal,

Samimi-Abianeh

2024

Energy Fuels

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The autoignition characteristics of ammonia (NH 3 ) and dimethyl ether (DME) blends were examined in this research project. The study investigates the autoignition characteristics by measuring ignition delay times across a range of gas temperatures from 621 to 725 K and at pressures of 5, 10, and 20 bar by using a rapid compression machine (RCM). Ignition delays of NH 3 /DME blends, with DME concentrations in the fuel mixture ranging from 0 to 50%, were measured, simulated, and compared with JP-8 and JP-5 fuel ignition delays. At a pressure of 20 bar, blends containing 30 and 50% DME concentrations exhibited ignition delay times similar to those of JP-8 and JP-5. Furthermore, the fuel blend with a 30% DME concentration showed similar ignition delays at the lower pressures of 5 and 10 bar. Several kinetic models were used to model the autoignition and compared with the measured data. Simulation results fairly matched the measured ignition delays. Through rigorous experimental verification, this comprehensive analysis evaluated the reliability of existing chemical models and paved the way for further studies on customized fuel blends, thereby contributing to the ongoing debate on sustainable energy alternatives.

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Species quantification during n-heptane autoignition using filtered natural emission of species

Cited by 5 publications

References 25 publications

Quantification of Three-Stage n-Pentane Autoignition Using Filtered Natural Emission of Species

Quantification of Three-Stage n-Pentane Autoignition Using Filtered Natural Emission of Species

Optical diagnostics of pentane autoignition using corrected filtered natural emission of species (C-FNES) technique

Autoignition Characteristics of Ammonia Dimethyl Ether Blends

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