The impact of hydrogen enrichment on the flow field evolution in turbulent explosions

Li, Tao; Hampp, Fabian; Lindstedt, R.P.

doi:10.1016/j.combustflame.2019.01.037

Cited by 16 publications

(6 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The wide range of H 2 concentrations results in significant differences in the mixture reactivity as well as reactant and burning properties. Li et al [5,7] presented a scaling factor for fuel lean blends of H 2 with CH and CO defined based on the amount of air required to fully oxidise each fuel component (0…”

Section: Scaling Relations For Mixtures With High H 2 Contentmentioning

confidence: 99%

“…The latter results in an elevated mean axial velocity (U /U b ) and an earlier and more pronounced peak in the axial velocity fluctuations ( √ u u /U b ) [23]. The stronger inhibiting effect of methane on the H 2 reaction chemistry compared to carbon monoxide, that was also observed in turbulent explosions [5,7] and auto-ignition re-lated flame stabilisation [8], is readily evident in the unconditional velocity statistics. This can be inferred from Fig.…”

Section: Flow Field Statisticsmentioning

confidence: 99%

“…This strong difference is also evident at Φ = 0.50, where S T,l reduces by 0.01 and 0.02 ms −1 per percent CO or CH 4 substitution corresponding to a variation from 0.3 ≤ β ≤ 0.5 for both blends. The strong inhibiting effect of CH 4 on the H 2 reaction chemistry compared to CO was also evident in laminar flames, explosion over pressures and fast turbulent deflagrations [5,7] as well as auto-ignition in a turbulent shear layer [8].…”

Section: Turbulent Burning Velocitymentioning

confidence: 99%

“…Li et al [5] measured flame speeds and over-pressures generated in an obstructed flame tube for a wide range of binary and ternary H 2 , CO and CH 4 mixtures, with methane showing a stronger inhibiting effect on the mixture reactivity. Scaling based on the amount of air required to fully oxidise the mixture correlated the fuel composition impact on explosion over-pressures [5] and turbulent flow fields [7]. Simatos et al [8] investigated the effect of H 2 content in lean (Φ = 0.80) binary CH 4 and CO fuel blends on auto-ignition in turbulent shear layers and the stronger inhibiting effect of CH 4 prevailed.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

The reactivity of hydrogen enriched turbulent flames

Hampp

Goh

Lindstedt

2020

Process Safety and Environmental Protection

View full text Add to dashboard Cite

The use of hydrogen enriched fuel blends, e.g. syngas, offers great potential in the decarbonisation of gas turbine technologies by substitution and expansion of the lean operating limit. Studies assessing explosion risks or laminar flame properties of such fuels are common. However, there is a lack of experimental data that quantifies the impact of hydrogen addition on turbulent flame parameters including burning velocities and scalar fluxes. Such properties are here determined for aerodynamically stabilised flames in a back-to-burnt opposed jet configuration featuring fractal grid generated multi-scale turbulence (Re t = 314 ± 19) using binary H 2 / CH 4 and H 2 / CO fuel blends. The binary H 2 / CH 4 fuel blend is varied from α = X H2 /(X H2 + X F ) = 0.0, 0.2 and 0.4 -1.0, in steps on 0.1, and the binary H 2 / CO fuel blend from α = 0.3 -1.0 also in steps of 0.1. The equivalence ratio is adjusted between the mixture specific lower limit of local flame extinction and the upper limit of flashback. The flames are characterised using PIV measurements combined with a flame front detection algorithm. The study quantifies the impact of hydrogen enrichment on (i) turbulent burning velocity (S T ), (ii) turbulent transport and (iii) the rate of strain acting on flame fronts. Scaling relations (iv) that correlate S T with laminar flame properties are evaluated and (v) flow field data that permits validation of computational models is provided. It is shown that CH 4 results in a stronger inhibiting effect on the reaction chemistry of H 2 compared to CO, that turbulent transport and burning velocities are strongly correlated with the rate of compressive strain and that scaling relationships can provide reasonable agreement with experiments.

show abstract

Section: Scaling Relations For Mixtures With High H 2 Contentmentioning

confidence: 99%

Section: Flow Field Statisticsmentioning

confidence: 99%

Section: Turbulent Burning Velocitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The reactivity of hydrogen enriched turbulent flames

Hampp

Goh

Lindstedt

2020

Process Safety and Environmental Protection

View full text Add to dashboard Cite

show abstract

“…Over the recent years, the explosive characteristics of combustible gas with barriers have been extensively studied experimentally. 7 , 8 These studies focused on the shape, 9 − 15 blockage ratio, 16 − 19 location, 20 − 23 number, 24 − 26 spacing, 27 , 28 and fuel concentration. 29 − 33 Further, experiments have been conducted to obtain the explosive pressure parameters and flame transmission characteristics.…”

Section: Introductionmentioning

confidence: 99%

Effect of a Perforated Polyethylene Material on Propane–Air Explosion in a Confined Space

Qiao

Long³

2022

ACS Omega

View full text Add to dashboard Cite

In this study, the effect of polyethylene barriers with different blockage ratios on the explosion behavior of a propane–air premixed gas in a confined space is investigated. The maximum explosion pressure (P max), the deflagration index (K G), and the flame propagation process of the propane–air premixed gas with different barrier thicknesses are examined by using a horizontal closed tube with a length of 0.5 m and a diameter of 0.1 m and a high-speed camera. The atmospheric pressure and temperature of the premixed gas were 101.3 kPa and 18 °C, respectively. Based on the Canny operator, the position of the flame front at different times and the shape of the barriers before and after the explosion are determined, and the propagation speed of the premixed flame and the deformation rate of the barriers are obtained. The results indicate that the barriers change the flow field structure of the unburned gas and increase the folding degree of the flame front. With the increase in the blockage ratio, the explosion of a premixed system becomes more rapid and violent. Under the action of Rayleigh–Taylor instability, the variation in the flame propagation speed induces a change in the tube pressure. In addition, the deformation of a barrier causes a change in the maximum explosion pressure. The greater the deformation ratio of the barrier after the explosion, the larger the maximum explosion pressure.

show abstract