小通道内高参数火箭煤油流动传热特性研究  

Investigation on the Flow and Heat Transfer Characteristics of Rocket Kerosene in Small Channel with High Parameter

作　　者：高中华 兰海平[2] 潘辉[1] 韩伟[2] 封凡 毕勤成[1] GAO Zhonghua;LAN Haiping;PAN Hui;HAN Wei;FENG Fan;BI Qincheng(State Key Laboratory of Multiphase Flow in Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China;Xi’an Aerospace Propulsion Test Technique Institute,Xi’an 710100,China)

机构地区：[1]西安交通大学动力工程多相流国家重点实验室,西安710049 [2]西安航天动力试验技术研究所,西安710100

出　　处：《西安交通大学学报》2020年第1期108-115,共8页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目(51776167);国家科技重大专项资助项目(2017-III-0005-0029)

摘　　要：为探究火箭煤油在实际工程应用中的流动传热特性,在直径为2 mm、壁厚为0.5 mm的水平圆形小通道内进行了实验研究,实验参数为压力25 MPa、热流密度2~35 MW·m-2、质量流速8000~48000 kg·m-2·s-1。根据实验结果,讨论了质量流速、工质入口温度和热流密度对火箭煤油流动传热特性的影响,拟合得到了高参数火箭煤油的对流传热关联式,并引入概率密度函数(PDF)来减缓超临界煤油热物性随温度的剧烈变化。结果表明:超临界压力下煤油传热类似单相液体强制对流传热,传热系数沿流向递增;质量流速、入口油温和热流密度的增大均可带来传热强化。低雷诺数下,质量流速越大,入口油温越低,流阻越大;雷诺数大于105时,摩擦阻力系数主要取决于管壁相对粗糙度,与雷诺数无关。新的拟合传热式考虑了各物性参数的影响,可将平均预测偏差降至7.3%;同时,基于PDF的传热模型可以平滑拐点温度附近热物性的不连续快速变化,在388~430℃的范围内有效降低预测误差。To explore the flow and heat transfer characteristics of rocket kerosene in practical engineering applications,an experimental study was carried out in aΦ2 mm×0.5 mm horizontal circular channel.The experimental parameters are as follows:pressure 25 MPa,heat flux from 2 to 35 MW·m-2,mass flow rate from 8000 to 48000 kg·m-2·s-1.According to the experimental results,the effects of mass flow rate,inlet temperature and heat flux were discussed,and a convective heat transfer correlation for rocket kerosene with high parameters was developed.Meanwhile,the temperature probability density function(PDF)was introduced to slow down the drastic change of predicted thermal properties of supercritical kerosene with temperature.The results revealed that the heat transfer of kerosene at supercritical pressure is similar to the forced convection heat transfer of single-phase liquid,that the heat transfer coefficient increases along the flow direction,and that the increase of mass flow rate,inlet temperature and heat flux all can enhance heat transfer.At low Reynolds number,the increase of mass flow rate and the decrease of inlet temperature may lead to an increase of flow resistance.However,in high Reynolds number conditions,the friction coefficient is independent of Reynolds number and mainly depends on the relative roughness of the tube wall.The influences of various physical parameters were considered in the new fitted heat transfer correlation,which can reduce the average deviation to 7.3%.Meanwhile,the PDF-based heat transfer model can smooth the discontinuous rapid change of thermal properties near the inflection point temperature,and effectively reduce the prediction error in the temperature range of 388-430℃.

关 键 词：高参数 火箭煤油 流动传热 热物性 概率密度函数 

分 类 号：V511[航空宇航科学与技术—航空宇航推进理论与工程]