Article
Energy & Fuels
Hongyu Lu, Shixiang Liu, Jiang Lv, Xin Li, Michael A. Delichatsios, Longhua Hu
Summary: This work investigates the flame geometrical characteristics of vertical downward turbulent jet fires in still air. The study proposes a new physical model and conducts CFD simulation to show the combustion structure. The research reveals the inner flow field and average mixture fraction of a downward jet fire and validates the CFD result with experimental data. It also discusses the differences between downward, upward, and horizontal jet fires and presents a physical model considering the initial downward momentum, flame buoyancy, and air entrainment.
Article
Thermodynamics
Jinfei Zhao, Jiahao Liu, Chao Ding, Xuehui Wang, Jiang Wang
Summary: Ethylene, an important raw material in the petrochemical industry, is widely used in the production of polyethylene and vinyl chloride. In this study, experiments were conducted on inclined ethylene jet fires to investigate their horizontal extension distances. The results showed that the horizontal extension distance of ethylene jet fires increases with the heat release rate but decreases with the inclined angle. Through similarity analysis, a correlation was established between the dimensionless horizontal extension distance (Lph/d) and the flame Froude number (Frf). Additionally, a correlation was derived between the dimensionless horizontal extension distance and the modified flame Froude number Frf*(Frf* = cos theta 3/4. Frf), which can accurately predict the experimental data.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Jinfei Zhao, Jiahao Liu, Haihang Li, Jian Wang
Summary: Experimental investigation on horizontal buoyancy-controlled jet fires was conducted to study the flame projection length under different ambient air pressures. It was found that the flame projection length increases with an increase in heat release rate and decreases with increasing ambient air pressure. The relationship between flame projection length and atmospheric pressure can be expressed as a power law.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Ruibang Sun, Juncai Wang, Xing Yang, Peng Chen
Summary: This study conducted experiments to investigate the characteristics of transformer oil jet fire, deriving functional relationships between flame height and mass flow, as well as flame temperature and axial height. A prediction model for radiant heat flux of transformer oil jet fire was established, which is significant for improving fire protection design in substations and enhancing fire management and control capabilities.
Article
Engineering, Chemical
Praveen Vijayan, Gireesh Kumaran Thampi, Pushpendra K. Vishwakarma, Adriana Palacios
Summary: This study investigates the relationship between the geometry of jet flames and the ambient conditions. The results show that reduced pressure leads to longer flame lengths and larger flame areas.
JOURNAL OF LOSS PREVENTION IN THE PROCESS INDUSTRIES
(2022)
Article
Engineering, Environmental
Kuibin Zhou, Xuan Nie, Chao Wang, Yandong Wang, Huichang Niu
Summary: Gas-solid jet fires exhibit characteristics of large lift-off height, low visible flame height, and low radiative fraction. Sand particles act as a heat sink to decrease flame temperature and burning velocity, as well as dilute gas fuel and isolate surrounding oxygen to inhibit combustion. These effects result in a large lift-off height, especially with smaller particle size sand.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2021)
Article
Engineering, Environmental
Kuibin Zhou, Mengya Zhou, Mengyuan Huang, Yifan Wang
Summary: This paper systematically investigates jet fire in a pit (JFP) caused by the explosion of underground pipelines. The study observes different types of flames and develops correlations for flame length and width in various pits, as well as proposes models to predict thermal radiation. The research indicates that flame buoyancy becomes more significant than nozzle exit momentum as the nozzle exit velocity increases, leading to the evolution of JFP behavior.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2022)
Article
Engineering, Environmental
Kuibin Zhou, Mengya Zhou, Mengyuan Huang, Yifan Wang
Summary: This paper presents a systematic investigation on the jet fire in a pit, including the variations of gas entrainment mode and flame behavior. A dimensionless heat release rate coupling the pit geometrical property is developed to correlate the flame area and length, which is validated by experimental data. Models for predicting the thermal radiation of the jet fire are proposed.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2022)
Article
Thermodynamics
Pan Li, Jiahao Liu, Deman Zhang, Guofeng Chen, Jian Wang
Summary: In pool fire experiments conducted at Lhasa with lower air pressure, the flames were found to be higher, with higher flame temperatures and lower radiation feedback compared to pool fires in Hefei.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Engineering, Environmental
Chunxiang Zhao, Xing Li, Xiaohan Wang, Min Li, Huahua Xiao
Summary: This paper experimentally studied the characteristics of H-2/CH4 jet flames at varied heat release rates (HRRs) with H-2 volume fraction (fv) ranging from 0% to 90%. The results showed that the flame height is affected by the increase in mixture molecular diffusivity, radicals pool, air entrainment, flame temperature, and jet velocity of fuel flow. A flame height model for H-2/CH4 flames was obtained through comparisons of different correlations.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2023)
Article
Thermodynamics
Hongyu Lu, Michael A. Delichatsios, Xin Li, Shixiang Liu, Jiang Lv, Longhua Hu
Summary: This study investigates the flame geometry of vertically downward facing buoyant turbulent jet fires under the influence of cross flows. Through experiments and modeling, three characteristic length scales representing flame geometry properties have been identified.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2021)
Article
Construction & Building Technology
Tao Deng, Stuart Norris, Rajnish N. Sharma
Summary: In a windy environment, the flame geometry of liquid fuel fires can be described by the flame tilt angle and base drag length. This study used numerical simulations with the FDS code to model three typical fire sizes in a longitudinally ventilated tunnel and a windy open space, and validated the CFD modeling methodology against experimental data. The findings showed that weak ventilation in the tunnel led to a backlayering flow, causing a two-layer flow pattern upstream and affecting the flame geometry. Unlike open fires, the tunnel area and heat release rate were found to be additional factors influencing the flame geometry.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2023)
Article
Thermodynamics
Huaxian Wan, Yueyue Xiao, Shuqi Wei, Yuchun Zhang, Yasushi Oka
Summary: This study experimentally investigated the flame extension below the ceiling induced by two unequal square gaseous fires in a 1:10 scale tunnel. The flame length and tilt angle were analyzed based on the measured gas temperatures. A new model for flame length and a merging criterion were proposed. The results provide useful references for personal evacuation, fire rescue, and risk assessment in tunnels.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Engineering, Multidisciplinary
Islam M. Mesallam, Ahmed A. A. Attia, Khairy H. El-Nagar, Ismail M. M. Elsemary
Summary: In this study, a diffusion jet flame consisting of a newly developed flame holder with three coaxial pipes to transfer air and fuel to the combustion zone, is experimentally investigated to simulate the ramjet effect. The results showed that the secondary air exit location had an effect on the flame temperature distribution, flame shape, flame length, and flame width. The optimum position of the secondary air pipe was found above the datum line at Z5 = 7.5 mm, where the flame temperature and length are considered relatively high compared to other secondary air pipe positions.
ALEXANDRIA ENGINEERING JOURNAL
(2023)
Article
Engineering, Civil
Qiang Wang, Feng Guo, Adriana Palacios Rosas
Summary: In this study, experimental investigations were conducted to examine the intermittent flame lengths in both reduced and normal pressures. The results showed that the intermittent flame lengths were positively related to the heat release rate and nozzle diameter. Lower ambient pressure led to significantly higher intermittent flame lengths. Furthermore, a model was established to quantify the intermittent flame lengths in the reduced pressure environment.
FIRE SAFETY JOURNAL
(2023)
Article
Engineering, Chemical
Chao Chen, Hang Chen, Li Mo, Shenbin Xiao, Changjun Li, Ming Yang, Genserik Reniers
Summary: Fire-induced domino effect is a major threat to hazardous material storage tanks. Previous research neglected the impact of wind load on the thermal buckling behavior of tanks exposed to fire. This paper conducts a numerical simulation to analyze the synergistic effects of fire and wind loads on the thermal post-buckling behavior of storage tanks, considering wind parameters and heat radiation parameters.
JOURNAL OF LOSS PREVENTION IN THE PROCESS INDUSTRIES
(2024)
Article
Engineering, Chemical
Zhang Chu, Liu Lili, Li Wei, Li Beibei, Liu Mingxing
Summary: This study predicts the fatigue life of blasting discs using a combined simulation method and measures the deformation of conventional slotted blasting discs subjected to repeated loading using a high-precision laser scanning method. A relationship model is established between deformation, loading pressure, cycle number, and change in blasting pressure. The results show that the deformation varies linearly with the cycle number and follows a power function relationship with the change in blasting pressure. The deformation can be used to accurately predict the fatigue life of blasting discs.
JOURNAL OF LOSS PREVENTION IN THE PROCESS INDUSTRIES
(2024)
Article
Engineering, Chemical
Shin-Mei Ouyang, Jia-Chi Ye, Wei-Chun Chen, Yu-Jen Chen, Chin-Feng Chen
Summary: This study employed the Taguchi method and analysis of variance to investigate the factors that influence the deterioration of pyrotechnics when stored under different humidity and temperature conditions. Various experimental methods were used to study the microstructure, heat flow, and safety of the pyrotechnics. The results showed that humidity had a significant impact on the pyrotechnics, and controlling humidity could reduce the hazards associated with storing pyrotechnics.
JOURNAL OF LOSS PREVENTION IN THE PROCESS INDUSTRIES
(2024)
Article
Engineering, Chemical
Bei Li, Huiqiang Liu, Heng Gao, Chi-Min Shu, Mingshu Bi
Summary: The moisture content sprayed into the dust layer in industrial sites is a main factor affecting reignition. The study found that moisture has a certain influence on the thermophysical properties of the dust layer, playing an important role in heat transfer and heat absorption processes. The results showed that as the moisture content increased, the thermal conductivity and heat sink density of the sample increased, indicating the need to have a heat sink density higher than the heat increase value to suppress ignition.
JOURNAL OF LOSS PREVENTION IN THE PROCESS INDUSTRIES
(2024)
Article
Engineering, Chemical
Yue Jing, Yong Pan, Fan Yang, Dan Wei, Wenhe Wang
Summary: A comprehensive risk assessment method for the esterification process was proposed in this study. It established a comprehensive evaluation index system and utilized improved Dempster-Shafer evidence theory and cloud model for assessment. The method was validated through case studies and showed consistency with established indexes.
JOURNAL OF LOSS PREVENTION IN THE PROCESS INDUSTRIES
(2024)