摘要
研究了超临界压力下CO_2在管径d分别为15mm和10mm的镍基合金水平圆管内的对流换热特性,并探讨了在700℃左右等壁温条件下工质的压力、温度和质量流量等参数对对流换热系数的影响.结果表明:压力和质量流量的增大均能明显提高对流换热系数,压力达到8 MPa时,617管和321管对流换热系数的峰值分别为174.2W/(m2·K)和166.6W/(m2·K);通过比较实验值与计算值发现,经典关联式的计算值误差较大;新拟合关联式的计算值有明显改进,误差小于12%.
Convective heat-transfer characteristics of supercritical CO2 fluid in horizontal nickel-based alloy tubes of sizes d=15 mm and 10 mm were respectively studied in a test rig, while the effects of following factors on the convective heat-transfer coefficient were analyzed at wall temperature of 700 ℃, such as the medium pressure, medium temperature and mass flux, etc. Results show that the increase of medium pres- sure and mass flow rate can significantly improve the heat-transfer coefficient; when the pressure gets up to 8 MPa, the heat-transfer coefficient of tube 617 and tube 321 can reach 174.2 W/（m2 K） and 166.6 W/（m2 K）, respectively. By comparing the expermental data and calculated results, it has been found that the caculation results of classical correlations are obviously deviated from experimental data, but the newly fitted correlation is relatively accurate, with a calculation error less than 12%.
出处
《动力工程学报》
CAS
CSCD
北大核心
2018年第2期138-144,共7页
Journal of Chinese Society of Power Engineering
基金
国家自然科学基金资助项目(U1361201)
关键词
超临界CO2
对流换热系数
修正系数
镍基合金
supercritical CO2
convective heat-transfer coefficient
correction factor
nickel-based alloy
作者简介
葛学利（1984-），男，山东枣庄人，博士研究生，主要从事电站锅炉超超临界和煤清洁燃烧技术方面的研究．;张忠孝（通信作者），男，教授，博士，电话（Tel．）：021-34207274；E-mail：zhangzhongxiao@sjtu．edu．cn．
