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<p>The compressed air foam system (CAFS) has demonstrated significant potential for use in combating flammable liquid fires at ultra-high voltage (UHV) substations in high-altitude environments. However, the system performance and fire extinguishing performance of CAFS at high altitude are unclear. In this study, the performance of the air compressor, water pump, and CAFS at different altitudes was studied. Besides, the fire extinguishing performance of CAFS at different altitudes, different system flow rates, and different expansion ratios (ERs) was also studied. Results indicated that as the altitude increases, the gas pressure decreases, the pressurization time of the air compressor increases, and the pressurization efficiency decreases. The flow and outlet pressure of the water pump increased with increasing altitude. Besides, the fire extinguishing performance of the CAFS is improved as the altitude or the system flow rate increases. The optimal parameter settings for CAFS with excellent system performance and fire extinguishing performance at high altitude are 11.4&#xa0;L/min of the system flow rate and 8 times the ER. The results of this paper can guide flammable liquid fire prevention and control in UHV substations at high altitude.</p>

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Investigation on the System Performance and Fire Extinguishing Performance of Compressed Air Foam System Under Varied Altitudes

  • 期刊论文

  • 发表日期：

    2026年7月18日

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  • Yi Guo,
  • Jiaqing Zhang,
  • Guocheng Ding,
  • Youjie Sheng,
  • Shouxiang Lu,
  • Yang Li

摘要

The compressed air foam system (CAFS) has demonstrated significant potential for use in combating flammable liquid fires at ultra-high voltage (UHV) substations in high-altitude environments. However, the system performance and fire extinguishing performance of CAFS at high altitude are unclear. In this study, the performance of the air compressor, water pump, and CAFS at different altitudes was studied. Besides, the fire extinguishing performance of CAFS at different altitudes, different system flow rates, and different expansion ratios (ERs) was also studied. Results indicated that as the altitude increases, the gas pressure decreases, the pressurization time of the air compressor increases, and the pressurization efficiency decreases. The flow and outlet pressure of the water pump increased with increasing altitude. Besides, the fire extinguishing performance of the CAFS is improved as the altitude or the system flow rate increases. The optimal parameter settings for CAFS with excellent system performance and fire extinguishing performance at high altitude are 11.4 L/min of the system flow rate and 8 times the ER. The results of this paper can guide flammable liquid fire prevention and control in UHV substations at high altitude.