Radical quenching of metal wall surface in a methane-air premixed flame

Saiki, Yasuhisa; Fan, Yong; Suzuki, Yuji

doi:10.1016/j.combustflame.2015.07.043

Cited by 48 publications

(8 citation statements)

References 35 publications

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“…At a higher temperature of 163 °C, the Péclet number of aluminum decreases by 1.2, while the Péclet number of the LSCO-coated aluminum only decreases by 0.5. There are two possible explanations: (1) adsorption of the reactive radicals from the preheating zone on the surface as observed in other studies ,− for different catalytic materials and (2) a reduction of the thermal barrier effect of the LSCO since the overall heat losses are reduced at higher wall temperatures. The possibility of partial fuel conversion by the catalyst at low gas temperatures of 163 °C even before the experiment starts is less probable because Yang et al .…”

Section: Resultsmentioning

confidence: 78%

Perovskite Catalyst for In-Cylinder Coating to Reduce Raw Pollutant Emissions of Internal Combustion Engines

Fischer

Nolte

et al. 2022

ACS Omega

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Aiming to achieve the highest combustion efficiency and less pollutant emission, a catalytic coating for cylinder walls in internal combustion engines was developed and tested under several conditions. The coating consists of a La0.8Sr0.2CoO3 (LSCO) catalyst on an aluminum-based ceramic support. Atomic force microscopy was applied to investigate the surface roughness of the LSCO coating, while in situ diffuse infrared Fourier transform spectroscopy was used to obtain the molecular understanding of adsorption and conversion. In addition, the influence of LSCO-coated substrates on the flame quenching distance was studied in a constant-volume combustion chamber. Investigations conclude that an LSCO coating leads to a reduction of flame quenching at low wall temperatures but a negligible effect at high temperatures. Finally, the influence of LSCO coatings on the in-cylinder wall-near gas composition was investigated using a fast gas sampling methodology with sample durations below 1 ms. Ion molecule reaction mass spectrometry and Fourier transform infrared spectroscopy revealed a significant reduction of hydrocarbons and carbon monoxide when LSCO coating was applied.

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Section: Resultsmentioning

confidence: 78%

Perovskite Catalyst for In-Cylinder Coating to Reduce Raw Pollutant Emissions of Internal Combustion Engines

Fischer

Nolte

et al. 2022

ACS Omega

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“…However, at time of writing, there is little data to describe this behaviour for ammonia-based fuels. Most studies focus on the behaviour of pure methane [17] or hydrogen flames [18], or otherwise describe the catalysis of pure ammonia decomposition on surfaces [19]. Therefore, there are few (if any) detailed reaction mechanisms that can model this behaviour to aid understanding of the impact of materials on both combustion characteristics and on material properties.…”

Section: Introductionmentioning

confidence: 99%

The Evaluation of Ammonia/Hydrogen Combustion on the H Permeation and Embrittlement of Nickel-Base Superalloys

Ковалева

Dziedzic

Mashruk

et al. 2022

Volume 7: Industrial and Cogeneration; Manufacturing Materials and Metallurgy; Microturbines, Turbochargers, and Small Turbomac

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Recent studies exploring ammonia as a green hydrogen energy carrier have established its suitability for a variety of combustion technologies including gas turbines, furnaces, and internal combustion engines. Of significant interest are ammonia/hydrogen blends, which possess combustion benefits over pure ammonia, including an extended stability range and higher laminar burning velocity. Despite extensive research characterising the flame properties of these blends, very few studies explore the suitability of existing materials for the manufacture of ammonia/hydrogen combustors. The present study evaluates the impact of ammonia/hydrogen flame chemistry on the H permeation and possible loss of ductility of nickel-superalloys through exposing the samples to pure methane and ammonia/hydrogen flames at atmospheric pressure for a 5-hour period. The effect of the two flame compositions on the materials are compared through thermal desorption analysis (TDA) and room temperature tensile testing. The results showed that exposure to an ammonia/hydrogen combustion environment led to hydrogen being absorbed by the nickel superalloys but a possible variation in ductility is influenced by the combustion conditions. Furthermore, the formation of an oxide layer was shown to likely impact the hydrogen absorption rate of the materials. This work shows that ammonia/hydrogen flame chemistry on combustor materials should not be ignored and warrants further studies on material’s mechanical and environmental stability controlled by nitrogen and hydrogen species permeating at industrially relevant conditions.

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“…For example, it is well known (Jainski et al 2017b;Häber and Suntz 2018;Bellenoue et al 2003;Blanc et al 1947;Kosaka et al 2018) that the quenching distance changes systematically as a function of fuel and equivalence ratio and that it strongly depends on the marker used to evaluate it. Studies on the effect of surface temperature and material have shown that the flame-wall interaction at low surface temperatures (<500 K) is governed solely by the heat losses to the wall (Kim et al 2006;Miesse et al 2004;Yang et al 2011Yang et al , 2013Saiki et al 2015). Furthermore, the quenching distance and wall heat flux systematically change as a function of wall surface temperature in sidewall and head-on configurations (Popp and Baum 1997;Ezekoye et al 1992;Hasse et al 2000;Jainski et al 2017b;Kosaka et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Quenching Distances for Side-Wall Quenching Using Detailed Diffusion and Chemistry

Zirwes

Häber

Zhang

et al. 2020

Flow Turbulence Combust

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The numerical investigation of quenching distances in laminar flows is mainly concerned with two setups: head-on quenching (HOQ) and side-wall quenching (SWQ). While most of the numerical work has been conducted for HOQ with good agreement between simulation and experiment, far less analysis has been done for SWQ. Most of the SWQ simulations used simplified diffusion models or reduced chemistry and achieved reasonable agreement with experiments. However, it has been found that quenching distances for the SWQ setup differ from experimental results if detailed diffusion models and chemical reaction mechanisms are employed. Side-wall quenching is investigated numerically in this work with steady-state 2D and 3D simulations of an experimental flame setup. The simulations fully resolve the flame and employ detailed reaction mechanisms as well as molecular diffusion models. The goal is to provide data for the sensitivity of numerical quenching distances to different parameters. Quenching distances are determined based on different markers: chemiluminescent species, temperature and OH iso-surface. The quenching distances and heat fluxes at the cold wall from simulations and measurements agree well qualitatively. However, quenching distances from the simulations are lower than those from the experiments by a constant factor, which is the same for both methane and propane flames and also for a wide range of equivalence ratios and different markers. A systematic study of different influencing factors is performed: Changing the reaction mechanism in the simulation has little impact on the quenching distance, which has been tested with over 20 different reaction mechanisms. Detailed diffusion models like the mixture-averaged diffusion model and multi-component diffusion model with and without Soret effect yield the same quenching distances. By assuming a unity Lewis number, however, quenching distances increase significantly and have better agreement with measurements. This was validated by two different numerical codes (OpenFOAM and FASTEST) and also by 1D head-on quenching simulations (HOQ). Superimposing a fluctuation on the inlet velocity in the simulation also increases the quenching distance on average compared to the reference steady-state case. The inlet velocity profile, temperature boundary condition of the rod and radiation have a negligible effect. Finally, three dimensional simulations are necessary in order to obtain the correct velocity field in the SWQ computations. This however has only a negligible effect on quenching distances.

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Radical quenching of metal wall surface in a methane-air premixed flame

Cited by 48 publications

References 35 publications

Perovskite Catalyst for In-Cylinder Coating to Reduce Raw Pollutant Emissions of Internal Combustion Engines

Perovskite Catalyst for In-Cylinder Coating to Reduce Raw Pollutant Emissions of Internal Combustion Engines

The Evaluation of Ammonia/Hydrogen Combustion on the H Permeation and Embrittlement of Nickel-Base Superalloys

Numerical Study of Quenching Distances for Side-Wall Quenching Using Detailed Diffusion and Chemistry

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