有机混合工质对发动机进气冷却流场特性的影响研究  

Study on the Effect of Organic Mixed Working Medium on the Characteristics of Engine Inlet Cooling Flow Field

作　　者：陆禹铭 费红姿[1] 胡峰 张海[1] LU Yuming;FEI Hongzi;HU Feng;ZHANG Hai(College of Power and Energy Engineering,Harbin Engineering University,Harbin,China,Post Code:150001;No.703 Research Institute of CSSC,Harbin,China,Post Code:150078)

机构地区：[1]哈尔滨工程大学动力与能源工程学院,黑龙江哈尔滨150001 [2]中国船舶集团有限公司第七○三研究所,黑龙江哈尔滨150078

出　　处：《热能动力工程》2024年第8期41-48,共8页Journal of Engineering for Thermal Energy and Power

基　　金：哈尔滨工程大学高水平科研引导专项(3072022QBZ0302)。

摘　　要：为了解决高马赫数状态下压气机进气温度过高的问题,建立了气液两相流耦合模型,采用不同质量分数的乙醇、乙二醇作为冷却工质进行数值模拟,探究了有机工质质量分数和种类对预冷段流场换热效果、蒸发特性,阻力损失之间变化规律的影响。结果表明:蒸发率和蒸发量都会随着有机工质质量分数的增加而提高,其中乙醇溶液更佳,当质量分数由10%增加到50%时,蒸发效果提高约20%,且质量分数的变化规律与液气比互不影响;当有机物质量分数越低时,流场的温降效果越好,差值大小也取决于液气比,在液气比为3.3%条件下,10%与50%质量分数的乙醇溶液温降差值为3.15 K,乙二醇溶液为3.46 K;流场的压降损失受多个因素的共同影响,并非呈单一的线性关系,伴随着液气比的增加,高质量分数的有机工质可以减少压力损失,但在进气速度略低的条件下则相反;流场出口均匀度与溶液质量分数基本呈正相关,且易蒸发的工质如乙醇对均匀度的影响更大。In order to solve the problem of high compressor inlet temperature under high Mach number,a coupling model of gas-liquid two-phase flow was established,and ethanol and ethylene glycol with different mass fractions were used as cooling working fluids for numerical simulation,and the effects of organic working medium mass fraction and type on heat exchange effect,evaporation characteristics and resistance loss in flow field of precooling section were explored.The results show that both the evaporation rate and evaporation amount increase with the increase of the mass fraction of organic working medium,in which ethanol solution has a best effect,when the mass fraction is increased from 10%to 50%,the evaporation effect is increased by about 20%,and the change of mass fraction has no influence on the liquid-gas ratio.The lower the mass fraction of organic matter,the better the temperature drop effect of the flow field,and the difference depends on the liquid-gas ratio.When the liquid-gas ratio is 3.3%,the difference between the temperature drop of ethanol solution and glycol solution between 10%and 50%mass fractions are 3.15 K and 3.46 K.The pressure drop loss of flow field is affected by many factors,and it is not a single linear relationship.With the increase of liquid-gas ratio,organic working medium with high mass fraction can reduce the pressure loss,but it is opposite under the condition of slightly lower intake speed.The outlet uniformity of the flow field is positively correlated with the mass fraction of the solution,and the evaporative working medium such as ethanol has a greater influence on the uniformity.

关 键 词：有机工质 喷雾冷却 蒸发 总压损失 

分 类 号：V235.1[航空宇航科学与技术—航空宇航推进理论与工程]