| PR方程推算氮气/灭火剂蒸气等熵指数 |
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| 引用本文： | 陈梦东,余建祖,施尚,谢永奇.PR方程推算氮气/灭火剂蒸气等熵指数[J].航空动力学报,2017,32(10):2378-2383. |
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| 作者姓名： | 陈梦东 余建祖 施尚 谢永奇 |
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| 作者单位： | 1.北京航空航天大学 航空科学与工程学院,北京 100191 |
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| 摘 要： | 氮气(N2)/灭火剂蒸气组成的混合气体的容积等熵指数和温度等熵指数随充填压力和温度的变化关系是影响机载灭火系统灭火剂释放过程的重要因素。基于PR(Peng Robinson)方程和范德瓦尔混合规则,编制了N2/灭火剂混合气体的容积等熵指数和温度等熵指数的计算程序,计算了三组混合气体N2/HFC227ea、N2/CF3I和N2/CF3Br充填压力分别为42MPa和25MPa,初始温度为293K时等熵指数随温度的变化曲线。结果表明:它们的容积等熵指数和温度等熵指数随着温度的升高而逐渐下降,呈近似线性关系。在相同温度下,充填压力为42MPa时的三组混合物的容积等熵指数和温度等熵指数均高于充填压力25MPa时的结果。在相同的充填压力和温度下,N2/CF3I的等熵指数最大,其次为N2/HFC227ea和N2/CF3Br的最小。
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| 关 键 词： | 灭火系统 PR方程 等熵指数 灭火剂 气液平衡 |
| 收稿时间： | 2016/3/29 0:00:00 |
Estimating isentropic exponent for nitrogen and fire extinguishing agent vapor using PR equation |
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| CHEN Mengdong,YU Jianzu,SHI Shang,XIE Yongqi.Estimating isentropic exponent for nitrogen and fire extinguishing agent vapor using PR equation[J].Journal of Aerospace Power,2017,32(10):2378-2383. |
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| Authors: | CHEN Mengdong YU Jianzu SHI Shang XIE Yongqi |
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| Abstract: | The variation of volumetric isentropic exponent and temperature isentropic exponent of the gas mixture of nitrogen (N2) and fire extinguishing agent vapor with pressurized pressure and temperature are a key influential factor to the fire extinguishing agent discharge progress for the aircraft fire extinguishing system.Based on the PR (Peng-Robinson) equation associated with the classical van der Waals mixing rule,a program was developed to estimate volumetric isentropic exponent and temperature isentropic exponent for the mixture of N2 and fire extinguishing agent vapor.The curves of volumetric isentropic exponent and temperature isentropic exponent varying with temperature were calculated with the pressurized pressure of 4.2 MPa and 2.5 MPa and initial temperature of 293 K for the binary system of N2/HFC227ea,N2/CF3I and N2/CF3Br.The results showed that volumetric isentropic exponent and temperature isentropic exponent decreased as temperature increased and the relation was nearly linear.The volumetric isentropic exponent and temperature isentropic exponent of all the three binary systems had a higher value with pressurized pressure of 4.2 MPa than with 2.5 MPa at the same temperature.When pressurized to an equal pressure at same temperature,isentropic exponent of N2/CF3I had a largest value followed by the results of N2/HFC227ea and N2/CF3Br. |
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| Keywords: | fire extinguishing system PR equation isentropic exponent fire extinguishing agent vapour-liquid equilibrium |
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