A shock-tube study of NH3 and NH3/H2 oxidation using laser absorption of NH3 and H2O

Alturaifi, Sulaiman A.; Mathieu, Olivier; Petersen, Eric L.

doi:10.1016/j.proci.2022.08.016

Cited by 11 publications

(11 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This behavior is the same as in the previously measured NO profiles of NH 3 /0% H 2 mixtures at similar temperatures (<1900 K). It should be noted that while NH 3 and H 2 O profiles were determined in recent work on NH 3 /H 2 mixtures using laser absorption in shock tubes, those authors did not report NO concentrations. , …”

Section: Resultsmentioning

confidence: 99%

“…In addition, the sensitivity coefficients of most reactions are reduced upon H 2 addition, except for two reactions with H 2 participation which can produce the H radical, namely, H 2 + OH ↔ H + H 2 O (reaction R5) and H 2 + O ↔ H + OH (reaction R6). This result appears for both mechanisms, although with somewhat different intensities, indicating the particular importance of these two reactions upon H 2 addition, which was also highlighted by Alturaifi et al…”

Section: Resultsmentioning

confidence: 99%

“…It should be noted that while NH 3 and H 2 O profiles were determined in recent work on NH 3 /H 2 mixtures using laser absorption in shock tubes, those authors did not report NO concentrations. 22,29 For a better quantitative analysis, we have extracted two characteristic parameters from the NO time histories, as illustrated in Figure 6, namely, NO max , i.e., the maximum NO mole fraction and τ(NO max/2 ), i.e., the time from time zero (P 5 , T 5 ) to the time corresponding to the position of half of the NO max . They represent the amplitude and phase of NO profiles, respectively.…”

Section: Shockmentioning

confidence: 99%

“…Some investigations have highlighted the reactivity enhancement by blending NH 3 with H 2 in different reactors, such as shortened ignition delay time (IDT), measured in rapid compression machines (RCMs) and shock tubes, − or increasing laminar flame speed, measured by the heat flux method or in a combustion vessel. , Furthermore, ammonia–hydrogen blends were studied in a porous media burner, a premixed combustion chamber, and turbulent premixed flames. , However, detailed species profiles are scarce and just becoming available for selected conditions. ,− Specifically, Alturaifi et al and He et al have performed shock tube experiments with varied NH 3 /H 2 mixture composition, employing laser diagnostics to measure NH 3 and H 2 O time histories in the former and temperature and NH 3 concentrations in the latter work, but time-resolved NO profiles at similar conditions have not been reported. Zhang et al, Osipova et al, and Manna et al have analyzed the reaction behavior of several NH 3 /H 2 mixtures in a jet-stirred reactor (JSR) at atmospheric pressure in the temperature range from 800 K to 1350 K, determining species with different techniques.…”

Section: Introductionmentioning

confidence: 99%

“…27,28 However, detailed species profiles are scarce and just becoming available for selected conditions. 22,29−32 Specifically, Alturaifi et al 22 and He et al 29 have performed shock tube experiments with varied NH 3 /H 2 mixture composition, employing laser diagnostics to measure NH 3 and H 2 O time histories in the former and temperature and NH 3 concentrations in the latter work, but time-resolved NO profiles at similar conditions have not been reported. Zhang et al, 30 Osipova et al, 31 and Manna et al 32 have analyzed the reaction behavior of several NH 3 /H 2 mixtures in a jet-stirred reactor (JSR) at atmospheric pressure in the temperature range from 800 K to 1350 K, determining species with different techniques.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Interactions in Ammonia and Hydrogen Oxidation Examined in a Flow Reactor and a Shock Tube

et al. 2023

View full text Add to dashboard Cite

Ammonia (NH 3 ) is a promising fuel, because it is carbon-free and easier to store and transport than hydrogen (H 2 ). However, an ignition enhancer such as H 2 might be needed for technical applications, because of the rather poor ignition properties of NH 3 . The combustion of pure NH 3 and H 2 has been explored widely. However, for mixtures of both gases, mostly only global parameters such as ignition delay times or flame speeds were reported. Studies with extensive experimental species profiles are scarce. Therefore, we experimentally investigated the interactions in the oxidation of different NH 3 /H 2 mixtures in the temperature range of 750−1173 K at 0.97 bar in a plug-flow reactor (PFR), as well as in the temperature range of 1615−2358 K with an average pressure of 3.16 bar in a shock tube. In the PFR, temperature-dependent mole fraction profiles of the main species were obtained via electron ionization molecular-beam mass spectrometry (EI-MBMS). Additionally, for the first time, tunable diode laser absorption spectroscopy (TDLAS) with a scanned-wavelength method was adapted to the PFR for the quantification of nitric oxide (NO). In the shock tube, time-resolved NO profiles were also measured by TDLAS using a fixed-wavelength approach. The experimental results both in PFR and shock tube reveal the reactivity enhancement by H 2 on ammonia oxidation. The extensive sets of results were compared with predictions by four NH 3 -related reaction mechanisms. None of the mechanisms can well predict all experimental results, but the Stagni et al. [React.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Shockmentioning

confidence: 99%