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Hybrid Oxygen Enrichment and Preheating Strategy for Performance Recovery in Ultra‐Lean Micro–Trapped Vortex Combustors.

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Title: Hybrid Oxygen Enrichment and Preheating Strategy for Performance Recovery in Ultra‐Lean Micro–Trapped Vortex Combustors.
Authors: Benzitouni, Anouar1 (AUTHOR), Settar, Abdelhakim2 (AUTHOR), Naouam, Boudinar1 (AUTHOR), Azzouz, Salaheddine1 (AUTHOR), Mansouri, Zakaria3 (AUTHOR) zak.mansouri@ntu.ac.uk
Source: Energy Science & Engineering. Jun2026, Vol. 14 Issue 6, p3028-3041. 14p.
Subject Terms: *Lean combustion, *Hydrogen flames, *Combustion chambers, *High temperatures, *Abatement (Atmospheric chemistry), *Energy consumption, *Combustion
Abstract: Ultra‐lean operation in micro‐combustion‐based thermophotovoltaic systems offers significant benefits including low pollutant emissions and increased longevity due to reduced thermal stresses, but it is hindered by low thermal performance. This paper numerically addresses the potential of oxygen enrichment and preheating to counteract performance losses in a hydrogen‐powered micro‐trapped vortex combustor operating under ultra‐lean conditions. A Taguchi design of 16 cases was conducted at a fixed equivalence ratio of ϕ = 0.3, varying inlet temperature from 300 to 450 K and O2 levels from 21% to 30%, to evaluate their impact on radiative power, energy conversion efficiency, combustion efficiency, and NOx emissions. Results indicate that excessive enrichment (30% O2) at high inlet temperature (≥ 400 K) leads to flame flashback, establishing an upper safety limit. Within the stable operating region, O2 enrichment substantially improved radiative power by up to 56%, while preheating enhanced radiative efficiency by up to 73%, with both factors exhibiting equal influence on combustion efficiency. However, the use of oxygen‐enriched air remarkably increased NOx emissions compared to the baseline case at 21% O2. Moreover, the optimal configuration with Tin = 450 K and XO2 = 0.27 has achieved 41% higher energy efficiency and 99% lower pollutant emissions compared to the lean case at ϕ = 0.8. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
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Header DbId: enr
DbLabel: Energy & Power Source
An: 194418756
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Items – Name: Title
  Label: Title
  Group: Ti
  Data: Hybrid Oxygen Enrichment and Preheating Strategy for Performance Recovery in Ultra‐Lean Micro–Trapped Vortex Combustors.
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  Data: <searchLink fieldCode="AR" term="%22Benzitouni%2C+Anouar%22">Benzitouni, Anouar</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Settar%2C+Abdelhakim%22">Settar, Abdelhakim</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Naouam%2C+Boudinar%22">Naouam, Boudinar</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Azzouz%2C+Salaheddine%22">Azzouz, Salaheddine</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Mansouri%2C+Zakaria%22">Mansouri, Zakaria</searchLink><relatesTo>3</relatesTo> (AUTHOR)<i> zak.mansouri@ntu.ac.uk</i>
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  Data: <searchLink fieldCode="JN" term="%22Energy+Science+%26+Engineering%22">Energy Science & Engineering</searchLink>. Jun2026, Vol. 14 Issue 6, p3028-3041. 14p.
– Name: Subject
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  Group: Su
  Data: *<searchLink fieldCode="DE" term="%22Lean+combustion%22">Lean combustion</searchLink><br />*<searchLink fieldCode="DE" term="%22Hydrogen+flames%22">Hydrogen flames</searchLink><br />*<searchLink fieldCode="DE" term="%22Combustion+chambers%22">Combustion chambers</searchLink><br />*<searchLink fieldCode="DE" term="%22High+temperatures%22">High temperatures</searchLink><br />*<searchLink fieldCode="DE" term="%22Abatement+%28Atmospheric+chemistry%29%22">Abatement (Atmospheric chemistry)</searchLink><br />*<searchLink fieldCode="DE" term="%22Energy+consumption%22">Energy consumption</searchLink><br />*<searchLink fieldCode="DE" term="%22Combustion%22">Combustion</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Ultra‐lean operation in micro‐combustion‐based thermophotovoltaic systems offers significant benefits including low pollutant emissions and increased longevity due to reduced thermal stresses, but it is hindered by low thermal performance. This paper numerically addresses the potential of oxygen enrichment and preheating to counteract performance losses in a hydrogen‐powered micro‐trapped vortex combustor operating under ultra‐lean conditions. A Taguchi design of 16 cases was conducted at a fixed equivalence ratio of ϕ = 0.3, varying inlet temperature from 300 to 450 K and O2 levels from 21% to 30%, to evaluate their impact on radiative power, energy conversion efficiency, combustion efficiency, and NOx emissions. Results indicate that excessive enrichment (30% O2) at high inlet temperature (≥ 400 K) leads to flame flashback, establishing an upper safety limit. Within the stable operating region, O2 enrichment substantially improved radiative power by up to 56%, while preheating enhanced radiative efficiency by up to 73%, with both factors exhibiting equal influence on combustion efficiency. However, the use of oxygen‐enriched air remarkably increased NOx emissions compared to the baseline case at 21% O2. Moreover, the optimal configuration with Tin = 450 K and XO2 = 0.27 has achieved 41% higher energy efficiency and 99% lower pollutant emissions compared to the lean case at ϕ = 0.8. [ABSTRACT FROM AUTHOR]
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=enr&AN=194418756
RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1002/ese3.70518
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      – Code: eng
        Text: English
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        PageCount: 14
        StartPage: 3028
    Subjects:
      – SubjectFull: Lean combustion
        Type: general
      – SubjectFull: Hydrogen flames
        Type: general
      – SubjectFull: Combustion chambers
        Type: general
      – SubjectFull: High temperatures
        Type: general
      – SubjectFull: Abatement (Atmospheric chemistry)
        Type: general
      – SubjectFull: Energy consumption
        Type: general
      – SubjectFull: Combustion
        Type: general
    Titles:
      – TitleFull: Hybrid Oxygen Enrichment and Preheating Strategy for Performance Recovery in Ultra‐Lean Micro–Trapped Vortex Combustors.
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            NameFull: Benzitouni, Anouar
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            NameFull: Settar, Abdelhakim
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            NameFull: Naouam, Boudinar
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            NameFull: Azzouz, Salaheddine
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            – D: 01
              M: 06
              Text: Jun2026
              Type: published
              Y: 2026
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              Value: 14
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            – TitleFull: Energy Science & Engineering
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