摘要
为探索超临界压力下减阻剂对高温火箭煤油的减阻效果,在压力为15 MPa、质量流速为17 000~50 000kg·m-2·s-1(对应常温流速约20~60m·s-1)、流体温度从常温至360℃和热流密度为2.5~30MW·m-2的试验条件下,对火箭煤油和添加减阻剂的低流阻火箭煤油在直径2mm×0.5mm的高温合金钢管内的流动与换热特性进行了研究。研究发现:在本文研究条件下,煤油传热机理为超临界压力单相类液态强制对流换热;减阻剂对火箭煤油的减阻效果明显,减阻率最高可达60%;随着流体温度升高,雷诺数增大,减阻剂的减阻效果降低,减阻率最低下降至约20%;添加减阻剂后,煤油传热性能显著弱化,但高雷诺数下减阻煤油的换热性能基本维持不变,减阻煤油与火箭煤油的努塞尔数之比约为0.5;雷诺数小于63 000时减阻效果大于传热弱化效果,大于63 000时结果相反。
To explore the drag reduction effect of drag reducer on rocket kerosene under supercritical pressure and high temperature conditions,flow and heat transfer characteristics of rocket kerosene M and low-flow resistance rocket kerosene M-3 with drag reducer were investigated in a Φ2 mm×0.5 mm high-temperature alloy steel tube as active cooling channels.Experiments were conducted at pressure of 15 MPa,mass flow rates of 17000-50000 kg/(m^2·s)(corresponding to the normal temperature flow rates of about 20-60 m/s),and heat flux range of 2.5-30 MW/m^2.It indicated that:① The heat transfer mechanism of the rocket kerosene under the test conditions was supercritical liquid-like forced convection heat transfer;② The drag reducing effect of drag reducer on rocket kerosene was obvious,the maximum drag reducing rate reached up to 60%,and with the increase of fluid temperature,the Reynolds number increased,the drag reduction effect decreased,and the minimum drag reducing rate approached 20%;③ For the rocket kerosene with drag reducing agents,the heat transfer reduction occurred significantly,however,the heat transfer performance of kerosene M-3 hardly changed in high Reynolds number conditions,and the Nusselt number ratio of M-3 to M kept at about 0.5;and ④ When the Reynolds number was below 63000,the drag reduction was greater than the heat transfer reduction,while when the Reynolds number was greater than 63000,the results reversed.
作者
张赞坚
刘朝晖
潘辉
陈彦伯
毕勤成
ZHANG Zanjian;LIU Zhaohui;PAN Hui;CHEN Yanbo;BI Qincheng(State Key Laboratory of Multiphase Flow in Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China)
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2019年第1期129-134,156,共7页
Journal of Xi'an Jiaotong University
基金
国家自然科学基金资助项目(51776167)
关键词
火箭煤油
减阻剂
超临界
流阻
换热弱化
rocket kerosene
drag reducer
supercritical
flow resistance
heat transfer reduction