Flame behavior, shock wave, and instantaneous thermal field generated by unconfined vapor-liquid propylene oxide/air cloud detonation

Ye, Congliang; Du, Qing-lei; Liu, Lijuan; Zhang, Qi

doi:10.1016/j.dt.2022.05.002

Cited by 8 publications

(4 citation statements)

References 45 publications

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“…Therefore, when studying fuel explosion dispersion, cloud and fog propagation, cloud and fog detonation and its shock wave effect, the central axis of the cylindrical device is taken as the starting point, and the radius (replaced by the distance to detonation center later in this paper) can be used as the unique coordinate of space (Chen et al. , 2017; Machniewski and Molga, 2022; Ye et al. , 2022) to describe the variation law of detonation and its shock wave pressure with space and time.…”

Section: Determination and Verification Of Single Cloud Detonation An...mentioning

confidence: 99%

Numerical calculation of shock wave overpressure produced by multiple cloud detonation

Fu,

Zou,

Han

et al. 2024

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PurposeA model for calculating the global overpressure time history of a single cloud detonation from overpressure time history of discrete positions in the range of single cloud detonation is to be proposed and verified. The overpressure distribution produced by multiple cloud detonation and the influence of cloud spacing and fuel mass of every cloud on the overpressure distribution are to be studied.Design/methodology/approachA calculation method is used to obtain the global overpressure field distribution after single cloud detonation from the overpressure time history of discrete distance to detonation center after single cloud detonation. On this basis, the overpressure distribution produced by multi-cloud under different cloud spacing and different fuel mass conditions is obtained.FindingsThe results show that for 150 kg fuel, when the spacing of three clouds is 40 m, 50 m, respectively, the overpressure range of larger than 0.1 MPa is 5496.48 mˆ2 and 6235.2 mˆ2, which is 2.89 times and 3.28 times of that of single cloud detonation. The superposition effect can be ignored when the spacing between the three clouds is greater than 60 m. In the case of fixed cloud spacing, once the overpressure forms continuous effective superposition, the marginal utility of fuel decreases.Originality/valueA model for calculating the global overpressure time history of a single cloud detonation from overpressure time history of discrete positions in the range of single cloud detonation is proposed and verified. Based on this method, the global overpressure field of single cloud detonation is reconstructed, and the superimposed overpressure distribution characteristics of three cloud detonation are calculated and analyzed.

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Section: Determination and Verification Of Single Cloud Detonation An...mentioning

confidence: 99%

Numerical calculation of shock wave overpressure produced by multiple cloud detonation

Fu,

Zou,

Han

et al. 2024

Self Cite

View full text Add to dashboard Cite

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“…Li et al [18] studied the influence of the tension and shear forces generated by reflected waves on the cloud dispersal process. Ye et al [19], through numerical simulations, obtained the concentration distribution of gas-liquid phase fuel under unconstrained conditions, demonstrating the dynamic instantaneous isothermal field of the entire fuel cloud area during the dispersal process. Zhang [20] proposed the physical mechanism of a dual jet structure, suggesting the formation of unstable jets at the boundary between the cloud and the air.…”

Section: Introductionmentioning

confidence: 99%

Study on Multi-Scale Cloud Growth Characteristics of Frustoconical Dispersal Devices

Zhou,

Li,

Jiang

et al. 2024

Processes

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This study aims to understand cloud growth behavior and enhance cloud safety and reliability by investigating the design of cloud dispersal devices. Based on the experimental results and simulation results, this study analyzes the dispersion characteristics of cloud materials within a frustoconical device with a semi-cone angle ranging from 0° to 10° across multiple scales. The collision aggregation model for cloud particles and the multi-scale coupling mechanism for cloud growth are established. The research shows that the semi-cone angle of the device extends the effective cloud growth duration and enlarges the cloud macroscopic size. At the mesoscopic scale, vortex phenomena are observed, causing particles to converge within the cloud, resulting in collisions and aggregation. The vortices enhance the continuity of the cloud concentration. The magnitude of these vortices demonstrates a positive correlation with the magnitude of the semi-cone angle of the dispersal device. For a macroscopically stable cloud, the high-concentration area within the cloud moves outward radially with an increase in the semi-cone angle. This study provides a theoretical foundation for cloud morphology control technology, contributing to enhancing the safety and reliability of cloud systems.

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“…Although considerable efforts are being made to understand the kinetics of this conversion, the detailed mechanism of the epoxidation process is still unclear. , Large-scale production of PO is often considered dangerous due to a high volatility, high flammability, and wide explosion limits of PO . In this regard, it is also considered as a model and practical fuel-air explosive. − Thus, extensive experimental and numerical studies of PO/air explosion mechanisms have been carried out using simplified and detailed kinetic schemes.…”

Section: Introductionmentioning

confidence: 99%

“… 7 In this regard, it is also considered as a model and practical fuel-air explosive. 8 − 10 Thus, extensive experimental and numerical studies of PO/air explosion mechanisms have been carried out using simplified 11 and detailed 9 kinetic schemes.…”

Section: Introductionmentioning

confidence: 99%

Propylene Oxide Addition Effect on the Chemical Speciation of a Fuel-Rich Premixed n-Heptane/Toluene Flame

et al. 2022

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1,2-Propylene oxide (PO, C 3 H 6 O) is considered as a promising agent for improving fuel. In this work, the effect of PO additives on the species pool in a premixed burner-stabilized fuel-rich (ϕ = 1.6) flame fueled by n-heptane/ toluene mixture (7/3 by volume of liquids) at atmospheric pressure is studied by the flame-sampling molecular beam mass spectrometry and numerical modeling in order to get insight into the chemical aspects of the influence of oxygenates with an epoxy group on the formation of abundant intermediates (including PAH precursors) during combustion of fossil fuels. The flames with various loadings of PO in the fuel blend (from 0 to 16.3% in mole basis) are examined, and detailed kinetic mechanisms available in the literature are validated against the measurements of mole fraction profiles of reactants, major products, and many intermediate species. A higher reactivity of the fresh mixture and a reduction in the peak mole fractions of intermediates playing an important role in PAH formation (benzene, styrene, ethylbenzene, phenol, acetylene, diacetylene, etc.) are observed when PO is added. This was found to be due to simultaneously two factors: the partial replacement of "sooting" fuel (toluene, which is the main precursor of these species) with oxygenated additive, and the changes in the flame radical pool caused by PO addition. Propylene oxide additive was found to change the ratio between H, OH, O, and CH 3 toward an increase in the proportion of O and CH 3 . The detailed kinetic mechanisms considered in the work are found to overpredict the peak mole fraction of acetylene, a key species playing a crucial role in PAH growth. Its chemistry is revisited in order to provide a better prediction of C 2 H 2 and, as a result, PAHs.

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Flame behavior, shock wave, and instantaneous thermal field generated by unconfined vapor-liquid propylene oxide/air cloud detonation

Cited by 8 publications

References 45 publications

Numerical calculation of shock wave overpressure produced by multiple cloud detonation

Numerical calculation of shock wave overpressure produced by multiple cloud detonation

Study on Multi-Scale Cloud Growth Characteristics of Frustoconical Dispersal Devices

Propylene Oxide Addition Effect on the Chemical Speciation of a Fuel-Rich Premixed n-Heptane/Toluene Flame

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