基于VTPR方程计算N_2/CF_3I充填特性
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摘要
采用比容平移法修正原始的Peng-Robinson状态(VTPR)方程,提高三氟碘甲烷(CF_3I)液相饱和区密度的计算精度。基于VTPR方程,结合经典的范德瓦尔混合规则,计算了N_2作为增压介质时,CF_3I充填1/2灭火瓶和2/3灭火瓶所需的N_2质量,并与试验值和文献值进行对比。结果表明,不同充填工况的计算值与试验值基本吻合,并且优于PROFISSY软件的结果。获得了充填压力分别为2.5 MPa和4.2 MPa、CF_3I不同充填密度下的总压力与温度的关系式,并计算了灭火剂热膨胀充满灭火瓶的临界温度和临界压力,该压力-温度关系式可用于以CF_3I为灭火剂的机载灭火系统工程设计。
The volume translation method is used to correct the original Peng-Robinson state(VTPR)equation for representing the density of trifluoroiodomethane(CF_3I)in the saturated region.Based on VTPR equation associated with the classical van der Waals mixing rule,the mass of N_2 required to pressurize CF_3 I is calculated.For the case of filling one-half and two thirds of extinguisher,the results show that calculated mass of N_2 agrees well with the experimental data and it is better than the values of PROFISSY software.With different filling density of CF_3 I,the relationship of total pressure versus temperature is obtained when the super-pressurized pressure are 2.5MPa and 4.2MPa.Besides,the critical pressure and critical temperature are also acquired when the fire agent bottle is liquid-full.The relationship of pressure versus temperature for the agent of CF_3 I will help to design fire suppression system in aircraft.
The volume translation method is used to correct the original Peng-Robinson state(VTPR)equation for representing the density of trifluoroiodomethane(CF_3I)in the saturated region.Based on VTPR equation associated with the classical van der Waals mixing rule,the mass of N_2 required to pressurize CF_3 I is calculated.For the case of filling one-half and two thirds of extinguisher,the results show that calculated mass of N_2 agrees well with the experimental data and it is better than the values of PROFISSY software.With different filling density of CF_3 I,the relationship of total pressure versus temperature is obtained when the super-pressurized pressure are 2.5MPa and 4.2MPa.Besides,the critical pressure and critical temperature are also acquired when the fire agent bottle is liquid-full.The relationship of pressure versus temperature for the agent of CF_3 I will help to design fire suppression system in aircraft.
引文
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[23]陈梦东,谢永奇,郭祥祥,等.PR方程和WS混合规则预测灭火瓶氮气充填量[J].北京航空航天大学学报,2016,42(10):2162-2168.CHENG M D,XIE Y Q,GUO X X,et al.Predicting filling mass of nitrogen in fire agent bottle based on PengRobinson equation of state with Wong-Sandler mixing rule[J].Journal of Beijing University of Aeronautics and Astronautics,2016,42(10):2162-2168(in Chinese).
[2]HARRINGTON J L.The halon phaseout speeds up[J].NFPA Journal,1993,87(2):38-42.
[3]GANN R G.Next-generation fire suppression technology program[J].Fire Technology,1998,34(4):363-371.
[4]GANN R G.FY2002annual report:Next generation fire suppression technology program(NGP)[M].Washington,D.C.:National Institute of Standards and Technology,2001:1-29.
[5]GANN R G.Advanced technology for fire suppression in aircraft:NIST Special Publication 1069[R].Gaithersburg:National Institute of Standards and Technology,2007.
[6]BORGHHETTI L,CHAER S,FERGUSON D,et al.Options for aircraft engine fire protection[R].WA:International Aircraft System Fire Protection Working Group,2000.
[7]TUZLA K,PALMER T,CHEN J C,et al.Development of computer program for fire suppressant fluid flow[R].Bethlehem,PA:Lehigh University,1998.
[8]YANG J C,CLEARY T G,VZQUEZ I,et al.Fire suppression system performance of alternative agents in aircraft engine and dry bay laboratory simulations:NISTSP-890[R].Washington,D.C.:U.S.Department of Commerce,1995.
[9]YANG J C,CLEARY T G,VZQUEZ I,et al.Measured and predicted thermodynamic properties of selected halon alternative/nitrogen mixtures[J].International Journal of Refrigeration,1997,20(2):96-105.
[10]李淑艳,王新月,卿雄杰,等.飞机/发动机灭火系统的设计与计算[J].西北工业大学学报,2006,24(1):124-127.LI S Y,WANG X Y,QIN X J,et al.An engineering method for extinguishing incipient aircraft/engine fire[J].Journal of Northwestern Polytechnical University,2006,24(1):124-127(in Chinese).
[11]郑友兰,金华,付金云.直升机灭火系统管路布局设计研究[J].直升机技术,2009(2):47-51.ZHENG Y L,JIN H,FU J Y.A study on tube distribution design for helicopter fire extinguishing system[J].Helicopter Technique,2009(2):47-51(in Chinese).
[12]牛雪民,谢永奇,余建祖.无通风直升机动力舱火灾温度场数值模拟[J].航空动力学报,2011,26(8):1761-1767.NIU X M,XIE Y Q,YU J Z.Simulation study on helicopter nacelle ventilation cooling system[J].Journal of Aerospace Power,2011,26(8):1761-1767(in Chinese).
[13]YANG J,BREUEL B.Thermodynamic properties of alternative agents:NIST Special Publication 861[R].Gaithersburg:Building and Fire Research Laboratory,1994.
[14]MARTIN J J.Equations of state—Applied thermodynamics symposium[J].Industrial&Engineering Chemistry,1967,59(12):34-52.
[15]PNELOUX A,RAUZY E,FRZE R.A consistent correction for Redlich-Kwong-Soave volumes[J].Fluid Phase Equilibria,1982,8(1):7-23.
[16]段远源,林鸿.比容平移法修正立方型状态方程[J].化工学报,2006,57(s):21-26.DUAN Y Y,LIN H.Modified cubic equations of state by bolume translation method[J].Journal of Chemical Industry and Engineering,2006,57(s):21-26(in Chinese).
[17]LIN H,DUAN Y Y.Empirical correction to the PengRobinson equation of state for the saturated region[J].Fluid Phase Equilibria,2005,233(2):194-203.
[18]NASIR Q,SABIL K M,LAU K K.Measurement of isothermal(vapor+liquid)equilibria,(VLE)for binary(CH4+CO2)fromT=(240.35to 293.15)K and CO2rich synthetic natural gas systems from T=(248.15to279.15)K[J].Journal of Natural Gas Science and Engineering,2015,27(1):158-167.
[19]LUIS A F G,JORGE A V J.A generalized cubic equation of state for non-polar and polar substance[J].Fluid Phase Equilibria,2016,418:74-87.
[20]LEMMON E W,MCLINDEN M O,HUBER M L.NIST reference fluid thermodynamic and transport properties(REFPROP),Version 8.0[S].Gaithersburg,MD:National Institute of Standards and Technology,2007.
[21]段远源.三氟碘甲烷和二氟甲烷的热物理性质研究[D].北京:清华大学,1998.DUAN Y Y.Research on thermophysical properties of trifluoroiodomethane and difluoromethane[D].Beijing:Tsinhua University,1998(in Chinese).
[22]LIM J S,KIM J.Vapor liquid equilibria of the binary systems nitrogen+bromotrifluoromethane,bromochlorodifluoromethane,1,1,1,2,3,3,3-heptafluoropropane,and+trifluoroiodomethane from 293.2to 313.2Kand 30to 100bar[J].Journal of Chemical and Engineering Data,1997,42(1):112-115.
[23]陈梦东,谢永奇,郭祥祥,等.PR方程和WS混合规则预测灭火瓶氮气充填量[J].北京航空航天大学学报,2016,42(10):2162-2168.CHENG M D,XIE Y Q,GUO X X,et al.Predicting filling mass of nitrogen in fire agent bottle based on PengRobinson equation of state with Wong-Sandler mixing rule[J].Journal of Beijing University of Aeronautics and Astronautics,2016,42(10):2162-2168(in Chinese).