A Model Considering the Flame Volume for Prediction of Thermal Radiation from Pool Fire

Shen, Gansu; Zhou, Kuibin; Wu, Fan; Jiang, Juncheng; Dou, Zhan

doi:10.1007/s10694-018-0779-y

Cited by 26 publications

(4 citation statements)

References 33 publications

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“…The transmissivity of thermal radiation in the air (τ a ) can be estimated by [38,39]: The transmissivity of thermal radiation in the smoke was defined as follows [38,40]:…”

Section: Radiant Heat Fluxmentioning

confidence: 99%

Experimental study on the radiant heat flux of wall-attached fire plume generated by rectangular sources

Huang

Wang

Zhu

et al. 2021

International Journal of Thermal Sciences

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“…The transmissivity of thermal radiation in the air (τ a ) can be estimated by [38,39]: The transmissivity of thermal radiation in the smoke was defined as follows [38,40]:…”

Section: Radiant Heat Fluxmentioning

confidence: 99%

Experimental study on the radiant heat flux of wall-attached fire plume generated by rectangular sources

Huang

Wang

Zhu

et al. 2021

International Journal of Thermal Sciences

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“…The power loss of the device includes through-state loss and switching losses. The thermal path network is divided into the Foster model and the Cauer model, which can be obtained by transient thermal impedance curve fitting, and the Cauer model requires access to specific physical parameters of materials in the IGBT structure, which is more difficult to implement [75]. The thermal path network is key to obtaining the junction temperature using the thermal path model method.…”

Section: Leakage Currentmentioning

confidence: 99%

Research Progress in Failure Mechanism and Health State Evaluation Index System of Welded IGBT Power Modules

et al. 2023

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As the performance requirements of insulated gate bipolar transistors (IGBTs) in various fields of power electronic systems are increasing, the IGBT power module package structure, aging mechanism analysis, and selection of health state characteristic parameters are of great significance to ensure the normal operation of power systems. At present, research on the aging failure of welded IGBT modules is relatively comprehensive and can be divided into chip aging failure and package aging failure according to their failure parts. However, there is some research on the relationship between aging failure and the characteristic quantity of power modules, but no definite system has been formed. Therefore, in this paper, the packaging structure of the solder-type IGBT modules and the aging mechanism caused by different aging reasons were summarized. Moreover, the health status monitoring of solder-type IGBT modules from the junction temperature, bonding line, solder layer, and package insulation aging health status monitoring and its quantitative assessment research progress was analyzed in detail. Also, the health state evaluation index system of the solder-type IGBT modules was completed on the basis of voltage, current, thermal, insulation parameters, and other characteristic quantities. Finally, based on the analysis of domestic and international research problems, the development trend and direction of the condition monitoring technology of solder-type IGBT modules is foreseen. The research on condition monitoring for welded IGBT module technology has a certain significance.

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“…In [17], the convection component of the heat flow from a spill fire of arbitrary shape was considered in detail, the influence of flame pulsations on the heat flow was neglected. In [18], it was noted that the traditional idea of a flame in the form of a cylinder or a cone can lead to an error in the calculation of the heat flow, and a refinement was proposed by adjusting the diameter and height of the flame. But the shape of the flame is considered constant, random pulsations are not taken into account.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

“…Therefore, the calculation of the heat flow from a combustible liquid spill fire requires the determination of the geometric shape of the flame [15]. But due to the turbulent nature of liquid combustion, the shape of the flame above the spill is not constant [18]. Random pulsations of the flame lead to random changes in the mutual radiation coefficient [21].…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Construction of the stochastic model of thermal radiation from a flammable liquid spill fire

Oliinyk

2023

EEJET

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The object of this study is the process of liquid combustion in the pool, and the subject of the study is the characteristics of the random process that describes the heat flow by radiation. Such, in particular, are the law of distribution, mathematical expectation, and correlation function. An experimental study of the combustion of used motor oil in a pool measuring 9.5×8.7 m2 was carried out. The mathematical expectation and variance of the cross-sectional area of the flame were determined by video recording followed by the analysis of individual frames. Testing of the hypothesis about the normal law of distribution of the cross-sectional area showed that with a confidence probability of 0.95, the proposed hypothesis does not contradict the experimental data. A selective correlation function and its approximation in the form of σ2exp(–α|τ|) were constructed. Due to the linear relationship between the cross-sectional area and the heat flux by radiation from the fire, the latter will also have a normal distribution law. At the same time, the magnitude of pulsations (the ratio of the rms deviation to the mathematical expectation) for these random processes will be the same. The value of the parameter α of the correlation function will also be the same. Taking into account the inertial properties of the device for measuring the heat flux density, a comparison of the experimentally measured values of the heat flux density with the calculated ones was carried out. The measurement results fall into the intervals corresponding to the confidence probability of 0.95. At the same time, the maximum deviation between calculated and experimental data is 14 %. From a practical point of view, the built stochastic model opens up possibilities for taking into account random flame pulsations when determining safe zones for the location of personnel and equipment. The model can be used to specify the thermal effect of fire on steel and concrete structures

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A Model Considering the Flame Volume for Prediction of Thermal Radiation from Pool Fire

Cited by 26 publications

References 33 publications

Experimental study on the radiant heat flux of wall-attached fire plume generated by rectangular sources

Experimental study on the radiant heat flux of wall-attached fire plume generated by rectangular sources

Research Progress in Failure Mechanism and Health State Evaluation Index System of Welded IGBT Power Modules

Construction of the stochastic model of thermal radiation from a flammable liquid spill fire

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