燃-滑油换热器壳侧换热特性研究  

A Study of Heat Transfer Characteristics on Shell-Side of Fuel- Oil Heat Exchanger

作　　者：王冬兰[1] 朱卫兵[2] 平登科 张小彬[2] 

机构地区：[1]北京动力机械研究所,北京100074 [2]哈尔滨工程大学航天与建筑工程学院,黑龙江哈尔滨150001

出　　处：《推进技术》2016年第5期900-906,共7页Journal of Propulsion Technology

摘　　要：针对航空发动机滑油系统所使用的小管径燃-滑油换热器,开展了壳侧换热特性实验研究。研究表明:当壳侧为滑油单相流时,壳侧对流换热系数可以采用Kern经验公式计算;在换热器可能的工作范围内,壳侧气液两相流流型为泡状流;保持液相折算速度(或气相折算速度)不变,两相对流换热系数随气相折算速度(或液相折算速度)的增大而增大,相同液相速度时,两相对流换热系数要大于单相,最大可达2.3倍;最后根据泡状流特点,基于L-M模型给出了壳侧两相换热系数计算公式,计算平均相对误差为3.6%,可满足工程需要。An experimental research of heat transfer characteristics on shell-side is carried out for the small diameter fuel-oil heat exchanger used in aviation engine oil system. Research shows that convective heat transfer coefficient on shell-side can be calculated using Kern empirical formula when the shell-side has single-phase oil. In the working range of heat exchanger,gas-liquid two-phase flow on shell-side is bubbly flow. Con-vective heat transfer coefficient of two-phase flow increases with the increase of gas superficial velocity （or liq-uid superficial velocity） when liquid superficial velocity （or gas superficial velocity） are held constant. Con-vective heat transfer coefficient of the two-phase flow is greater than that of the single-phase flow in the same liq-uid phase velocity, and the maximum is up to 2.3 times. At last, according to the characteristics of bubbly flow,a calculation formula of the two-phase convective heat transfer coefficient on shell-side is provided based on L-M model. The average relative error is about 3.6%,which can satisfy the engineering demand.

关 键 词：换热系数 泡状流 气液两相流 燃-滑油换热器 

分 类 号：TK124[动力工程及工程热物理—工程热物理]