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arxiv: 2606.12302 · v1 · pith:QDNR6YTVnew · submitted 2026-06-10 · ⚛️ physics.flu-dyn

Effect of Additively Manufactured Wall Lattice Structures on Flashback Limits in a Hydrogen Jet Flame Combustor

Alexander Jaeschke , Thomas Ludwig Kaiser , Lukas Melzig , Michael F. Zaeh , Kilian Oberleithner , Christian Oliver Paschereit This is my paper

Pith reviewed 2026-06-27 08:08 UTC · model grok-4.3

classification ⚛️ physics.flu-dyn
keywords hydrogen combustionflashback mitigationadditive manufacturinglattice structuresporous mediajet flame combustorflame dynamicswall cooling
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The pith

Additively manufactured lattice walls in a hydrogen jet flame nozzle improve flashback resistance primarily through cooling by unburnt mixture flowing through the porous structure.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

This paper tests whether body-centered cubic lattice structures built into the walls of a jet flame combustor nozzle can lower the risk of hydrogen flames flashing back into the mixing duct. Five nozzle configurations were compared, with lattice volume fraction and strut diameter varied against a solid-wall reference, using pure hydrogen at atmospheric pressure and Reynolds numbers from 9,000 to 12,000. The coarsest lattice version raised the flashback limit most clearly. The authors identify the main cause as unburnt mixture passing through the porous wall and cooling it, which alters the flame-wall thermal coupling while leaving the overall flow field and dominant shear-layer instabilities largely unchanged. If this holds, additive manufacturing offers a direct way to tune wall thermal conditions for safer hydrogen combustion hardware.

Core claim

The nozzle with the coarsest porous wall structure significantly improved the flashback resistance compared to a nozzle with a solid wall. The primary mitigation mechanism was a cooling effect by unburnt mixture flowing through the porous media. Flow fields and flame shapes showed only minor effects from wall modifications, preserving general flow characteristics across configurations, while combustion-chamber dynamics remained dominated by large-scale coherent structures in the shear layer, specifically Kelvin-Helmholtz instabilities. The findings confirmed that the integration of lattice structures through additive manufacturing provides a viable strategy for hydrogen flashback mitigation

What carries the argument

Body-centered cubic lattice structures in the mixing-duct walls that permit unburnt mixture to flow through and cool the wall surface.

If this is right

  • The approach works under the tested conditions of atmospheric pressure, pure hydrogen, and Reynolds numbers 9,000–12,000.
  • General flow characteristics and flame shapes stay similar across solid and lattice configurations.
  • Coarser lattice parameters (lower volume fraction, larger strut diameter) produce stronger flashback resistance than finer ones.
  • The dominant instability mechanism in the chamber remains Kelvin-Helmholtz structures in the shear layer regardless of wall type.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • The same lattice approach could be tested in other burner geometries where wall temperature controls flashback.
  • Blocking or enabling the through-flow in the lattice while keeping the wall geometry identical would isolate the cooling contribution from any geometric effects.
  • Extending the tests to elevated pressure or to hydrogen–air mixtures would check whether the cooling benefit scales to practical operating conditions.
  • The method might be combined with other flashback controls such as boundary-layer suction or catalytic coatings to achieve larger safety margins.

Load-bearing premise

The measured gain in flashback resistance is produced by the lattice-induced cooling rather than by small unintended differences in manufacturing tolerance, surface roughness, or internal flow geometry.

What would settle it

Direct wall-temperature measurements showing no cooling difference between the coarsest lattice nozzle and the solid wall, or an experiment in which porous flow is blocked yet flashback resistance remains equally improved, would show the cooling mechanism is not the cause.

Figures

Figures reproduced from arXiv: 2606.12302 by Alexander Jaeschke, Christian Oliver Paschereit, Kilian Oberleithner, Lukas Melzig, Michael F. Zaeh, Thomas Ludwig Kaiser.

Figure 1
Figure 1. Figure 1: Close-ups of the porous walls with the solid plate at the nozz [PITH_FULL_IMAGE:figures/full_fig_p016_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: Thermal conductivity κ of Inconel 718 (solid line) and 304 stainless steel (1.4301) (dashed line) with increasing temperature [PITH_FULL_IMAGE:figures/full_fig_p016_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: Test rig with the optical measurement setup. The flow dire [PITH_FULL_IMAGE:figures/full_fig_p016_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: Detailed cross-section of the jet burner with the mixing du [PITH_FULL_IMAGE:figures/full_fig_p017_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: OH*-chemiluminescence flame images at an adiabatic flame te [PITH_FULL_IMAGE:figures/full_fig_p017_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: Axial velocity component ¯ux shown at the axial positions x/d in the downstream direction over the combustion chamber width y/d. The operating condition was at an adiabatic flame temperature of Tad = 1600 K and an inlet velocity of ¯ux = 11.5 m/s [PITH_FULL_IMAGE:figures/full_fig_p018_6.png] view at source ↗
Figure 7
Figure 7. Figure 7: Turbulence intensity of the axial velocity component down [PITH_FULL_IMAGE:figures/full_fig_p018_7.png] view at source ↗
Figure 8
Figure 8. Figure 8: Flashback limits with the inlet velocity of the unburnt gas mixt [PITH_FULL_IMAGE:figures/full_fig_p018_8.png] view at source ↗
Figure 9
Figure 9. Figure 9: Measured wall temperatures (black marker) at the mixing [PITH_FULL_IMAGE:figures/full_fig_p019_9.png] view at source ↗
Figure 10
Figure 10. Figure 10: Effect of an inlet temperature variation (∆ [PITH_FULL_IMAGE:figures/full_fig_p019_10.png] view at source ↗
Figure 11
Figure 11. Figure 11: PSD of the machined nozzle at ¯ubulk = 9 m/s. The bottom plot shows the signals of the five axial measurement positions (p1 to p5). Line brightness decreases with increasing distance to the mixing duct outlet. The top plot shows the PSD of pressure sensor p5 for the non-reacting cases (green lines) and the cases with flame at Tad = 1600 K (black lines) both with (solid lines) and without (dashed lines) co… view at source ↗
Figure 12
Figure 12. Figure 12: Power spectra of the machined nozzle and the nozzle N-9 [PITH_FULL_IMAGE:figures/full_fig_p020_12.png] view at source ↗
Figure 13
Figure 13. Figure 13: SPOD modes j = 1 – 30 calculated from the PIV data. Shown is the machined case for u¯x = 11.5 m/s at a flame temperature of Tad = 1600 K [PITH_FULL_IMAGE:figures/full_fig_p020_13.png] view at source ↗
Figure 14
Figure 14. Figure 14: Leading SPOD modes for the machined nozzle (orange lines [PITH_FULL_IMAGE:figures/full_fig_p020_14.png] view at source ↗
Figure 15
Figure 15. Figure 15: Real part of the leading SPOD mode at f = 171 Hz indicated in [PITH_FULL_IMAGE:figures/full_fig_p021_15.png] view at source ↗
read the original abstract

This study investigated how additively manufactured nozzles with body-centered cubic lattice structures reduce the flame flashback propensity in a hydrogen jet flame burner. Five different configurations of a jet flame combustor were investigated, with a focus on mixing duct walls incorporating porous media. The nozzles were manufactured by the powder bed fusion of metals using a laser beam process. The lattice parameters were varied by the volume fraction and the strut diameter. For the experiments, pure hydrogen was used as fuel under atmospheric conditions at various equivalence ratios and Reynolds numbers of 9,000 - 12,000. Flow field measurements, flame imaging, and spectral proper orthogonal decomposition of the flame dynamics were employed to identify possible transition mechanisms from a stable operation to flashback. The flow fields and the flame shapes showed only minor effects from wall modifications, preserving general flow characteristics across configurations. The flow dynamics in the combustion chamber were dominated by large-scale coherent structures in the shear layer, specifically Kelvin-Helmholtz instabilities. The results demonstrated that the nozzle with the coarsest porous wall structure significantly improved the flashback resistance compared to a nozzle with a solid wall. It is concluded that the primary mitigation mechanism was a cooling effect by unburnt mixture flowing through the porous media. The findings confirmed that the integration of lattice structures through additive manufacturing provides a viable strategy for hydrogen flashback mitigation by manipulating the coupled interaction between the flame and the thermal conditions of the wall.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

3 major / 2 minor

Summary. The manuscript experimentally compares five additively manufactured hydrogen jet-flame nozzles whose mixing-duct walls incorporate body-centered-cubic lattice structures of varying volume fraction and strut diameter. Flow-field PIV, flame imaging, and SPOD show only minor differences across configurations; the coarsest lattice nozzle nevertheless exhibits a markedly higher flashback limit than the solid-wall reference. The authors conclude that the improvement arises primarily from cooling of the wall by unburnt mixture flowing through the porous lattice.

Significance. If the reported improvement is robust and the cooling mechanism is confirmed, the work supplies a concrete, AM-enabled design route for raising flashback margins in hydrogen combustors without major changes to the bulk flow field. The result is directly relevant to safe operation of hydrogen-fired gas turbines.

major comments (3)
  1. [Abstract, §4] Abstract and §4 (results): the central claim that the coarsest lattice improves flashback resistance 'primarily' via cooling by unburnt mixture through the porous media is not supported by any wall or near-wall temperature measurements. Only flow-field data are shown, which exhibit only minor differences; without temperature data the cooling attribution remains an inference rather than a demonstrated mechanism.
  2. [§2, §3] §2 (experimental methods) and §3 (manufacturing): all nozzles are produced by the same LPBF process, yet no quantitative bounds are given on actual strut diameter, surface roughness, or effective permeability deviations from nominal lattice parameters. These uncontrolled variations could alter flashback limits independently of the intended porous-flow cooling and are not ruled out by the reported data.
  3. [§4] §4 (flashback limits): the improvement is described as 'significant' but no error bars, repeatability statistics, or number of independent runs are reported for the flashback equivalence-ratio or velocity thresholds. Without these, it is impossible to judge whether the observed difference exceeds manufacturing or measurement variability.
minor comments (2)
  1. [Abstract, §2] The abstract states Reynolds numbers of 9,000–12,000 but does not specify whether these are based on the mixing-duct hydraulic diameter or another reference length; this should be clarified in §2.
  2. [Figures] Figure captions and axis labels in the flow-field and SPOD panels should explicitly state the color scale and normalization used for the velocity or mode amplitude fields.

Simulated Author's Rebuttal

3 responses · 0 unresolved

We thank the referee for the constructive comments, which help strengthen the manuscript. We address each major comment below, indicating where revisions will be made to clarify inferences, discuss manufacturing aspects, and improve statistical reporting.

read point-by-point responses

  1. Referee: [Abstract, §4] Abstract and §4 (results): the central claim that the coarsest lattice improves flashback resistance 'primarily' via cooling by unburnt mixture through the porous media is not supported by any wall or near-wall temperature measurements. Only flow-field data are shown, which exhibit only minor differences; without temperature data the cooling attribution remains an inference rather than a demonstrated mechanism.

    Authors: We agree that the cooling mechanism is inferred rather than directly measured. The PIV results demonstrate only minor flow-field differences across nozzles, indicating that the flashback improvement is unlikely to stem from bulk aerodynamic changes. Combined with the porous lattice permitting unburnt mixture permeation, cooling remains the most plausible explanation. We will revise the abstract and §4 to state that the improvement 'is attributed primarily to cooling... inferred from the similarity of the flow fields' and add a sentence recommending future near-wall temperature measurements for confirmation. revision: partial

  2. Referee: [§2, §3] §2 (experimental methods) and §3 (manufacturing): all nozzles are produced by the same LPBF process, yet no quantitative bounds are given on actual strut diameter, surface roughness, or effective permeability deviations from nominal lattice parameters. These uncontrolled variations could alter flashback limits independently of the intended porous-flow cooling and are not ruled out by the reported data.

    Authors: Nominal lattice parameters (volume fraction and strut diameter) are provided in §3, and all nozzles were produced in a single build with identical LPBF settings. Post-fabrication metrology was not conducted. We will add a paragraph in §3 noting typical LPBF dimensional tolerances (approximately ±0.15 mm for strut diameter) and surface roughness values from literature for similar Ti-6Al-4V lattices, together with a brief discussion that such variations are unlikely to account for the observed flashback difference. We cannot supply new quantitative bounds without additional measurements. revision: partial

  3. Referee: [§4] §4 (flashback limits): the improvement is described as 'significant' but no error bars, repeatability statistics, or number of independent runs are reported for the flashback equivalence-ratio or velocity thresholds. Without these, it is impossible to judge whether the observed difference exceeds manufacturing or measurement variability.

    Authors: We will revise §4 to report the number of independent flashback tests performed per configuration (five repeats) and include error bars representing one standard deviation of the measured flashback equivalence ratios and velocities. The experimental procedure already involved incremental variation of equivalence ratio until flashback, with the process repeated to assess repeatability. revision: yes

Circularity Check

0 steps flagged

No circularity: purely experimental study with no derivations or fitted predictions

full rationale

The paper reports experimental measurements of flashback limits, flow fields, and flame dynamics across five nozzle configurations manufactured with varying lattice parameters. All central claims (improved flashback resistance for the coarsest lattice, minor flow-field effects, dominance of Kelvin-Helmholtz structures) are grounded directly in the acquired data rather than any model, equation, or prediction that reduces to its own inputs. No self-citations, ansatzes, or uniqueness theorems appear as load-bearing steps. The interpretive conclusion that cooling via porous flow is the primary mechanism is an inference from the measurements, not a circular derivation. The work is therefore self-contained against external benchmarks with no circularity.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The central claim rests on the assumption that the lattice geometry can be realized faithfully by the additive process and that the observed difference is attributable to the intended porous flow rather than to secondary manufacturing effects. No free parameters are fitted; the lattice volume fraction and strut diameter are controlled experimental inputs.

axioms (1)
  • domain assumption The powder-bed fusion process produces lattice struts whose effective porosity and surface finish match the nominal CAD geometry closely enough that differences in flashback behavior can be attributed to the intended lattice parameters.
    Invoked implicitly when the authors vary volume fraction and strut diameter and interpret the results as effects of the porous media.

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