Numerical Investigation of External Wind Effect on Smoke Characteristics in a Stairwell

Ji, Jie; Zhu, Luqing; Ding, Long; Yu, Longxing; Wan, Huaxian

doi:10.1007/s10694-020-00948-4

Cited by 12 publications

(3 citation statements)

References 22 publications

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“…In this study, the effect of external wind was considered. The results show that the ascent speed of the plume increases to a certain height with the wind speed [11]. In 2021, the smoke expansion system was optimized in fire scenarios using a computational fluid dynamics model [12].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulations on Visibility and Temperature in a Car Park of a Commercial Building

Behbahani,

Hamzei,

Mehrdoost

et al. 2023

JME

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The study of temperature and visibility in the parking of the commercial complex was done by Fire Dynamic Simulator code with various fire accident. Specification fire of parking were obtained in different fan system conditions. Temperature and visibility of a stairwell on various conditions were contrasted. The values were obtained at a height of 1.6m. The results showed that in the first state, temperature and visibility reached 80°C and 1 meters in 1200s after the fire, respectively. In the second state, visibility reached 6.34m in 1200s, which was 6.34 times better than the first state. The temperature also decreased to 51.11°C in 1200s. The temperature improved by 36.19% compared to the first state. In the third state, after 1200s, the temperature decreased 44.72°C. In the third state, the visibility was 15.59m, which improved 15.59 times the first state

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Section: Introductionmentioning

confidence: 99%

Numerical Simulations on Visibility and Temperature in a Car Park of a Commercial Building

Behbahani,

Hamzei,

Mehrdoost

et al. 2023

JME

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“…A non-dimensional number was also proposed to determine the flame tilting direction. Later, Ji et al [15] proposed a quantitative model to predict the rise time of plume front under the combined effects of external wind and stack effect. However, the fire source was always located on the first floor in their studies.…”

Section: Introductionmentioning

confidence: 99%

“…In previous publications, most studies focused on characteristics of the upward moving smoke [3][4][5][6][7][8][9]. Some studied flame behaviors under the competition between the thermal buoyancy of fires and the inertia force of external wind with the fire on the first floor [14,15]. Then, there was no smoke back-layering phenomenon occurring inside the staircase.…”

Section: Introductionmentioning

confidence: 99%

Smoke Back-Layering Phenomenon under the Combined External Wind and Stack Effects in a Staircase

Wang

Chen

et al. 2022

Applied Sciences

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The external wind can change smoke movement patterns inside the staircase and affect smoke exhaust efficiency. This paper analyzes the smoke back-layering phenomenon in the staircase with open stair doors below the fire floor. The effect of the open stair door location and the heat release rate of fires and external wind velocities on smoke movement patterns are investigated numerically. The external wind ranges from 0–5.5 m/s. At 0 m/s, the smoke back-layering phenomenon driven by pressure difference can be found in the staircase with all stair doors closed. With the increasing wind velocity, four smoke behaviors are identified: upward moving smoke, first downward then upward moving smoke, downward moving smoke, and no smoke. Results show that the back-layering distance is mainly influenced by the external wind and heat release rate of fires. Correlations are modified and used to predict the longest back-layering distance with the first downward then upward moving smoke. This helps with arranging the smoke detectors inside a staircase and the fire safety design of high-rise buildings.

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Interaction of Heat Release Rate, Flame Tilt Angle and Flame Length of a Compartment Fire Under Stack Effect

Gao

et al. 2021

Fire Technol

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Numerical Investigation of External Wind Effect on Smoke Characteristics in a Stairwell

Cited by 12 publications

References 22 publications

Numerical Simulations on Visibility and Temperature in a Car Park of a Commercial Building

Numerical Simulations on Visibility and Temperature in a Car Park of a Commercial Building

Smoke Back-Layering Phenomenon under the Combined External Wind and Stack Effects in a Staircase

Interaction of Heat Release Rate, Flame Tilt Angle and Flame Length of a Compartment Fire Under Stack Effect

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