【作者】 杨鹏；

【导师】 童明伟；

【作者基本信息】 重庆大学 ， 制冷及低温工程， 2002， 硕士

【摘要】 本论文在参考研究国内外有关制冷工质、替代制冷工质及其含润滑油混合物在水平管内流动沸腾换热研究现状的基础上，对丙烷(R290)与润滑油Suniso 3GS的混合物的饱和温度、水平微肋管内流动沸腾换热及压降进行了实验研究与理论分析。实验的工况范围：含油率ω=0.43﹪-5.28﹪，质量流率G=40-220，蒸发温度-5℃、0℃、+5℃，试验段入口干度为0.1-0.18，出口干度0.8-0.95。并根据实验结果进行理论计算，得出以下结论：① 天然制冷剂R290含油混合物的饱和温度高于相同压力下纯工质的饱和 温度，这个温度差，也就是本文中提到的所谓制冷剂含油混合物的过热温度随混合物质量含气率、含油浓度的增加而增加，而饱和压力对过热温度的影响不大(含油率0.43﹪-5.28﹪)。② R290含油混合物在水平微肋管内流动沸腾换热特性的实验研究表明：a) 随着质量流率的增加，含油混合物微肋管内的沸腾平均换热系数增加。b) 不同含油率下，沸腾平均换热系数随质量含油率的增加而增加。c) 同一含油率下，蒸发温度对平均换热系数影响不大。③ 由于制冷剂含油混合物过热温度的存在，使其具有两种不同的饱和温度的定义，一种是所测实际温度，另一种是所测压力对应纯工质的饱和温度，论文中对这两种饱和温度定义下的沸腾平均换热系数进行了比较，发现后者大于前者。④ R290含油混和物在水平微肋管内沸腾换热的压降实验表明，在含油率范围0.43﹪-5.28﹪内，润滑油浓度的增加对混合物沸腾换热压降的影响不是很大更多还原

【Abstract】 On the basis of the investigation on the related literatures of new refrigerants substitutes and new refrigerant oil, the in-tube evaporation of refrigerant and refrigerant-oil mixtures. This paper make a experimental research on the saturated temperature of propane (R290) and lubricant oil (Suniso 3GS) mixtures, evaporation heat transfer and pressure drop characteristics in a horizontal micro-fin tube. The experimental conditions are as follows: the oil concentration is 0.43﹪-5.28﹪, mass flux is 40-200, and the evaporation temperature is form -5℃ to +5℃, the vapor quality is from 0.1 to 0.18 at the inlet of the test section and 0.8-0.95 at the outlet of test section. We make a theoretical analysis of the experimental results and draw some conclusions as follows:① The saturated temperature R290-oil mixture is higher than that of pure R290 at a same pressure. The temperature difference, which is called superheat temperature of refrigerant-oil mixtures, increases as the oil concentration and the vapor quality are increased at a certain saturated pressure and pressure has negligible effect on the superheat temperature of the mixture. ( oil concentration is 0.43﹪-5.28﹪).② The investigation on the evaporation heat transfer characteristics in a horizontal micro-fin tube for R290-3GS mixture shows:a) The average evaporation heat transfer coefficient of the mixture increase with the increasing of the mass flux. b) The average evaporation heat transfer coefficient decreases with the increasing of the oil concentration.c) The evaporation temperature has negligible effect on the average evaporation heat transfer coefficient at the same oil concentration.③ A heat transfer correlation is concluded by comparing the experimental results with the past conference correlations. And the deviation between the predicted and experimental values is ±30﹪ .④ The experiment on the evaporation resistance characteristics of R290-3GS mixture shows the oil concentration has negligible effect on the drop of the mixture. ( oil concentration is 0.43﹪-5.28﹪)更多还原