RP-3航空煤油不同替代模型的空化流动特性

发布时间：2018-01-05 00:02

本文关键词：RP-3航空煤油不同替代模型的空化流动特性　出处：《推进技术》2016年03期 　论文类型：期刊论文

【摘要】：为研究RP-3航空煤油空化流动特性,采用GERG-2004方程构建了4种RP-3航空煤油的物理替代模型并给出其主要物性参数,对收缩扩张流道内航空煤油替代模型、正十二烷(C12H26)和水体的空化流动进行了数值计算研究,计算时考虑了饱和蒸汽压修正及航空煤油物性参数随流场温度变化。结果表明:由45%正十二烷、25%正十烷、5%辛烷、5%甲基环己烷和20%甲苯(摩尔比)组成的替代模型能够较好拟合RP-3的物质属性,可用来替代RP-3进行空化流动计算。常温下航空煤油的初生空化数小于水体,相同空化数下(σ=1.5),水体的空穴长度约为航空煤油的1.4倍,航空煤油的空化强度更弱,液汽交界面较模糊。随着温度的升高,航空煤油空化热力学效应增强,但其在煤油泵工作温度区域内空化热力学效应不显著,在煤油泵空化性能预测时可以忽略煤油空化热力学效应的影响。
[Abstract]:In order to study the cavitation flow characteristics of RP-3 aviation kerosene, four physical substitution models of RP-3 aviation kerosene were constructed by using GERG-2004 equation and the main physical parameters were given. The aviation kerosene alternative model, 12 alkane C12H26) and the cavitation flow in water were numerically studied. The saturated vapor pressure correction and the variation of the physical properties of aviation kerosene with the flow field temperature are taken into account in the calculation. The results show that from 45% 12 alkanes to 25% n-decane and 5% octane. The substitution model composed of 5% methylcyclohexane and 20% toluene (molar ratio) can fit the material properties of RP-3 well. The primary cavitation number of aviation kerosene at room temperature is smaller than that of water, and at the same cavitation number, the hole length of water is about 1.4 times that of aviation kerosene. The cavitation intensity of aviation kerosene is weaker and the interface between liquid and steam is fuzzy. With the increase of temperature, the thermodynamic effect of aviation kerosene cavitation is enhanced, but the effect of cavitation thermodynamics is not significant in the working temperature region of coal pump. The thermodynamic effect of kerosene cavitation can be neglected in predicting the cavitation performance of coal oil pump.
【作者单位】：北京理工大学机械与车辆学院;南京机电液压工程研究中心航空机电系统综合航空科技重点实验室;
【基金】：国家自然科学基金资助项目(51479002) 航空科学基金项目(2013ZC09001)
【分类号】：V312
【正文快照】： 1引言当液体内部的局部压强降低到液体的当地饱和蒸汽压时,在液体内部或液固交界面上就会产生蒸汽或气体的空穴,这种现象称为空化[1]。空化流动的非定常过程包含了空穴的形成、发展、断裂、脱落和溃灭等多种复杂流动现象[2,3],空泡群的脱落和溃灭会引起强烈的振动、噪声和空蚀

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