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Volume 42 Issue 10
Oct.  2016
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Journal of Beijing University of Aeronautics and Astronautics  > 2016  >  42(10): 2162-2168.
CHEN Mengdong, XIE Yongqi, GUO Xiangxiang, et al. Predicting filling mass of nitrogen in fire agent bottle based on Peng-Robinson equation of state with Wong-Sandler mixing rule[J]. Journal of Beijing University of Aeronautics and Astronautics, 2016, 42(10): 2162-2168. doi: 10.13700/j.bh.1001-5965.2015.0661(in Chinese)
Citation: CHEN Mengdong, XIE Yongqi, GUO Xiangxiang, et al. Predicting filling mass of nitrogen in fire agent bottle based on Peng-Robinson equation of state with Wong-Sandler mixing rule[J]. Journal of Beijing University of Aeronautics and Astronautics, 2016, 42(10): 2162-2168. doi: 10.13700/j.bh.1001-5965.2015.0661(in Chinese)
shu

Predicting filling mass of nitrogen in fire agent bottle based on Peng-Robinson equation of state with Wong-Sandler mixing rule

doi: 10.13700/j.bh.1001-5965.2015.0661
  • 1.

    School of Aeronautic Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

  • 2. Fundamental Science on Ergonomics and Environment Control Laboratory, Beijing University of Aeronautics and Astronautics, Beijing 10008

  • 3. Science and Technology on Space Physics Laboratory, China Academy of Launch Vehicle Technology, Beijing 100076, China

  • Received Date: 13 Oct 2015
  • Publish Date: 20 Oct 2016
    Abstract
  • Nitrogen supplies driving force for the rapid discharge of fire agent in the fire extinguisher of the helicopter. Calculating the filling nitrogen and its mole fraction is one of the key issues to be solved in the design of fire extinguishing system of the engine nacelle in helicopter. Based on Peng-Robinson (PR) equation of state and Wong-Sandler (W-S) mixing rule, a prediction method to calculate the filling mass of nitrogen is proposed. To different filling cases of Halon1301 and HFC-227ea, the mass of filling nitrogen is obtained after three layers iteration relation and compared with the experimental and literature data. Also the change of pressure and mole fraction of nitrogen with temperature in the fire agent bottle is analyzed. The results show that, for the one-half and two-thirds filling conditions of Halon1301, the calculation errors of nitrogen are about 4.7% for one-half condition and 1.1% for two-thirds condition, and the calculation results are better than those of the PROFISSY and HFLOW software. For the one-half and two-thirds filling conditions of HFC-227ea, the calculation errors of nitrogen are about 4.3% and 2.3%, respectively. This method can be used in the design of aircraft fire extinguishing system.

     

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