Numerical study on the combustion and emissions characteristics of liquid ammonia spray ignited by dimethyl ether spray

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dc.contributor.authorLeng, Yupeng
dc.contributor.authorDai, Liming
dc.contributor.authorWang, Qian
dc.contributor.authorLu, Jiayu
dc.contributor.authorYu, Ouqing
dc.contributor.authorSimms, Nigel John
dc.date.accessioned2025-01-27T14:01:39Z
dc.date.available2025-01-27T14:01:39Z
dc.date.freetoread2025-01-27
dc.date.issued2024-12-31
dc.date.pubOnline2024-12-31
dc.description.abstractAmmonia has attracted considerable attention as a zero-carbon fuel for decarbonizing energy-intensive industries. However, its low reactivity and narrow flammability limit efficient ignition and efficient combustion. By using CONVERGR software, this study numerically investigates the ignition and combustion characteristics of liquid ammonia spray ignited by dimethyl ether spray in a constant-volume chamber at an ambient temperature of 900 K. Critical parameters, including injection angles (90°–150°), liquid ammonia injection pressures (60–90 MPa), and ambient pressures (2.8–5.8 MPa), were systematically analyzed to evaluate their effects on ignition conditions and emissions. Results indicate that increasing the injection angle improves mixing between liquid ammonia and dimethyl ether sprays, enhancing combustion efficiency and achieving a maximum efficiency of 92.47% at 120°. Excessively large angles cause incomplete combustion or misfire. Higher liquid ammonia injection pressures improve atomization and promote earlier interactions between the sprays but reduce combustion efficiency, decreasing by approximately 2% as injection pressure increases from 60 MPa to 90 MPa. Higher ambient pressures improve combustion stability but decrease ammonia combustion efficiency. Post-combustion NO emissions at 5.8 MPa are reduced by 60.48% compared to 3.8 MPa. The formation of NO is strongly correlated with the combustion efficiency of liquid ammonia. A higher combustion rate of liquid ammonia tends to result in elevated NO. Based on these findings, an injection angle of 120°, an NH3 injection pressure of 75 MPa, and an ambient pressure of 3.8 MPa are recommended to optimize combustion efficiency.
dc.description.journalNameFire
dc.description.sponsorshipThis research was funded by the National Natural Science Foundation of China (grant No. 52206149).
dc.identifier.citationLeng Y, Dai L, Wang Q, et al., (2024) Numerical study on the combustion and emissions characteristics of liquid ammonia spray ignited by dimethyl ether spray. Fire, Volume 8, Issue 1, December 2024, Article number 14
dc.identifier.eissn2571-6255
dc.identifier.elementsID561721
dc.identifier.issn2571-6255
dc.identifier.issueNo1
dc.identifier.paperNo14
dc.identifier.urihttps://doi.org/10.3390/fire8010014
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/23438
dc.identifier.volumeNo8
dc.languageEnglish
dc.language.isoen
dc.publisherMDPI
dc.publisher.urihttps://www.mdpi.com/2571-6255/8/1/14
dc.rightsAttribution 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subject30 Agricultural, Veterinary and Food Sciences
dc.subject4102 Ecological Applications
dc.subject4104 Environmental Management
dc.subject41 Environmental Sciences
dc.subject3007 Forestry Sciences
dc.subject13 Climate Action
dc.subject7 Affordable and Clean Energy
dc.subject3007 Forestry sciences
dc.subject4102 Ecological applications
dc.subject4104 Environmental management
dc.subjectammonia
dc.subjectdimethyl ether
dc.subjecthigh-pressure direct injection
dc.subjectammonia ignition enhancement
dc.titleNumerical study on the combustion and emissions characteristics of liquid ammonia spray ignited by dimethyl ether spray
dc.typeArticle
dcterms.dateAccepted2024-12-29

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