Effect of Vent Area Ratio on Vent Flow Characteristics and Temperature Distribution in a Compartment Fire with Two Ceiling Vents

• 영문명: Effect of Vent Area Ratio on Vent Flow Characteristics and Temperature Distribution in a Compartment Fire with Two Ceiling Vents
• 발행기관: 한국화재소방학회
• 저자명: Yu Mi Park Chi Young Lee
• 간행물 정보: 『International Journal of Fire Science and Engineering』Vol. 37, No. 1, 9~21쪽, 전체 13쪽
• 주제분류: 공학 > 공학일반
• 파일형태: PDF
• 발행일자: 2023.03.31

영문 초록

In this study, the effect of the vent area ratio on vent flow characteristics and temperature distribution in a compartment during a fire in the compartment with two ceiling vents was examined. The area ratio (A1/A2) between ceiling vent 1 (CV1), with a duct height of 0.19 m, and ceiling vent 2 (CV2), with a duct height of 0.05 m, was varied from 0.052 to 0.542, 1, 5.587, and 19.36, and numerical simulation was performed under these conditions. As the A1/A2 ratio increased, the flow pattern changed from unidirectional inflow to bidirectional flow for CV1 and from bidirectional flow to unidirectional inflow for CV2. When the A1/A2 ratio was 0.542, the outflow and inflow mass flow rates for CV1 and CV2 were found to be nearly equal. The outflow and inflow mass flow rates at CV1 were higher than those at CV2 when the A1/A2 ratio was high, while the outflow and inflow mass flow rates at CV2 were higher than those at CV1 when the A1/A2 ratio was low. Furthermore, it was observed that the temperature was lower and the temperature difference between the higher and lower regions in the upper part of the measurement position decreased near the lower part of the vent with a larger area compared to the vent with a smaller area. This was probably because the mixing effect increased near the vent with a larger area due to the occurrence of the active bidirectional flow pattern. When the flow pattern at CV1 was bidirectional, the previous correlation for predicting mass flow rate was examined. It was found that the previous correlation underestimated the mass flow rate of the numerical simulation conducted in this study.

목차

1. Introduction

2. Numerical Simulation Methods and Conditions

3. Results and Discussion

4. Conclusions

Author Contributions

Conflicts of Interest

Acknowledgments

References

키워드

Compartment fire Two ceiling vents Vent flow pattern Temperature distribution Numerical simulation