Autoignition of isolated n-heptane droplets in air and hot combustion products at microturbine conditions

Spontaneous ignition of isolated n-heptane droplets with initial diameters of 20-100  is simulated using air at 4 atm and 700-1200 K, which includes the typical operating conditions of recuperated microturbines. Because some fuel droplets in a combustor may be sprayed or carried to near the recircul...

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Published inCombustion theory and modelling Vol. 26; no. 3; pp. 541 - 559
Main Authors Wang, Jiayi, Mastorakos, Epaminondas
Format Journal Article
LanguageEnglish
Published Abingdon Taylor & Francis 16.04.2022
Taylor & Francis Ltd
Subjects
Autoignition
Combustion chambers
Combustion products
Delay time
Dilution
Droplets
Fuels
Heptanes
hot products
Ignition
Low temperature
low-temperature chemistry
microturbine
Mixtures
single droplet
Spontaneous combustion
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ISSN1364-7830
1741-3559
DOI10.1080/13647830.2022.2034976

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Abstract Spontaneous ignition of isolated n-heptane droplets with initial diameters of 20-100  is simulated using air at 4 atm and 700-1200 K, which includes the typical operating conditions of recuperated microturbines. Because some fuel droplets in a combustor may be sprayed or carried to near the recirculation zone, the simulations use a mixture of pure air and hot combustion products as the oxidiser. The flame structures, evaporation times, and autoignition times in both physical and mixture fraction spaces for the different conditions are presented and compared. The variables examined include the air preheat temperature, amount of dilution with hot products, initial fuel droplet diameter, oxidiser temperature, and oxygen concentration. The results show that droplets in pure air at microturbine conditions fully evaporate before ignition, suggesting that a prevaporised concept is suitable for microturbines. The dilution with hot combustion products decreases the ignition delay time mainly by raising the oxidiser temperature. Low-temperature chemistry does not have a significant effect on droplet ignition because adding even a small amount of hot combustion products can increase the oxidiser temperature to higher than the temperatures favourable for low-temperature kinetics. The cool flame is only observed for 100  droplets at low temperatures, but two-stage ignition is not observed.
AbstractList Spontaneous ignition of isolated n-heptane droplets with initial diameters of 20–100  is simulated using air at 4 atm and 700–1200 K, which includes the typical operating conditions of recuperated microturbines. Because some fuel droplets in a combustor may be sprayed or carried to near the recirculation zone, the simulations use a mixture of pure air and hot combustion products as the oxidiser. The flame structures, evaporation times, and autoignition times in both physical and mixture fraction spaces for the different conditions are presented and compared. The variables examined include the air preheat temperature, amount of dilution with hot products, initial fuel droplet diameter, oxidiser temperature, and oxygen concentration. The results show that droplets in pure air at microturbine conditions fully evaporate before ignition, suggesting that a prevaporised concept is suitable for microturbines. The dilution with hot combustion products decreases the ignition delay time mainly by raising the oxidiser temperature. Low-temperature chemistry does not have a significant effect on droplet ignition because adding even a small amount of hot combustion products can increase the oxidiser temperature to higher than the temperatures favourable for low-temperature kinetics. The cool flame is only observed for 100  droplets at low temperatures, but two-stage ignition is not observed.
Spontaneous ignition of isolated n-heptane droplets with initial diameters of 20-100  is simulated using air at 4 atm and 700-1200 K, which includes the typical operating conditions of recuperated microturbines. Because some fuel droplets in a combustor may be sprayed or carried to near the recirculation zone, the simulations use a mixture of pure air and hot combustion products as the oxidiser. The flame structures, evaporation times, and autoignition times in both physical and mixture fraction spaces for the different conditions are presented and compared. The variables examined include the air preheat temperature, amount of dilution with hot products, initial fuel droplet diameter, oxidiser temperature, and oxygen concentration. The results show that droplets in pure air at microturbine conditions fully evaporate before ignition, suggesting that a prevaporised concept is suitable for microturbines. The dilution with hot combustion products decreases the ignition delay time mainly by raising the oxidiser temperature. Low-temperature chemistry does not have a significant effect on droplet ignition because adding even a small amount of hot combustion products can increase the oxidiser temperature to higher than the temperatures favourable for low-temperature kinetics. The cool flame is only observed for 100  droplets at low temperatures, but two-stage ignition is not observed.
Author Wang, Jiayi
Mastorakos, Epaminondas
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CitedBy_id crossref_primary_10_1049_rpg2_12777
crossref_primary_10_1016_j_proci_2024_105639
crossref_primary_10_1177_17568277231159173
crossref_primary_10_1016_j_combustflame_2024_113626
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Snippet Spontaneous ignition of isolated n-heptane droplets with initial diameters of 20-100  is simulated using air at 4 atm and 700-1200 K, which includes the...
Spontaneous ignition of isolated n-heptane droplets with initial diameters of 20–100  is simulated using air at 4 atm and 700–1200 K, which includes the...
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SubjectTerms Autoignition
Combustion chambers
Combustion products
Delay time
Dilution
Droplets
Fuels
Heptanes
hot products
Ignition
Low temperature
low-temperature chemistry
microturbine
Mixtures
single droplet
Spontaneous combustion
Title Autoignition of isolated n-heptane droplets in air and hot combustion products at microturbine conditions
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