化工学报 ›› 2020, Vol. 71 ›› Issue (S1): 172-178.doi: 10.11949/0438-1157.20191096

• 流体力学与传递现象 • 上一篇    下一篇

板翅式换热器压力特性工程计算方法

贺鹏程(),庄莉,胡亮,刘刚,王瑞琪,包亚强   

  1. 中国航空工业集团公司金城南京机电液压工程研究中心,江苏 南京 211106
  • 收稿日期:2019-10-07 修回日期:2019-11-16 出版日期:2020-04-25 发布日期:2020-05-22
  • 通讯作者: 贺鹏程 E-mail:suchsoup@126.com
  • 作者简介:贺鹏程(1967—),男,硕士,工程师,suchsoup@126.com

Discussion on method of engineering computation of plate-fin heat exchanger pressure characteristic

Pengcheng HE(),Li ZHUANG,Liang HU,Gang LIU,Ruiqi WANG,Yaqiang BAO   

  1. Nanjing Engineering Institute of Aircraft Systems, AVIC, Nanjing 211106, Jiangsu, China
  • Received:2019-10-07 Revised:2019-11-16 Online:2020-04-25 Published:2020-05-22
  • Contact: Pengcheng HE E-mail:suchsoup@126.com

摘要:

换热器是工业的基础设备,也是飞行器中的重要设备,其广泛应用于发动机、飞行器环境控制等飞机需要换热的系统中,用于维持人员舒适安全和设备高效正常运行,其准确工程设计方法影响设备及系统的可靠运行,很多换热器设计文献对其压力相关计算问题进行了详细说明,但将换热器设计和流体力学文献进行对比和分析,发现两者在一些概念和定义上存在差异,根据流体力学文献中的概念提出了相应的换热器压力特性工程计算公式。具体选取了一种空气换热器常用的锯齿翅片作为算例,不考虑散热的绝热情况,构建单流程及双流程板翅式换热器,以涵盖突扩、突缩、90°和180°局部等结构变化的压力变化特性计算,运用Halton序列进行拟Monte Carlo对一定跨度内的温度、压力、Re的单流程、双流程换热器出口条件进行计算,经过这两类换热器计算统计发现:封头压降和压力损失在整个换热器压损中占比概率情况下较小,概率密度最大在0.05附近,换热器总压降在大部分情况下较出口压力小,流体性质可按固定压力计算。

关键词: 多孔介质, 产品设计, Monte Carlo模拟, 压力损失, 压降, 阻力

Abstract:

Heat exchanger is the fundamental equipment of industry, which is important for the air vehicle, widely used in engine and ECS subsystem which is needed for it. The heat exchangers are usually used for passenger safety and comfort, which is also the important device for other equipment to keep normal and efficient work. The references of heat exchanger design and hydrodynamics have been contrasted and analyzed, some concepts and definitions are different from each other, the engineering calculation expressions of pressure characteristic of plate-fin heat exchangers have been put forward on the basis of hydrodynamics. One type of offset strip fin has been chosen for air-air heat exchanger, the one-pass and two-pass heat exchanger was set, which contained sudden expansion and contraction and 90°elbow and 180° elbow for the local pressure drop computation, the heat transfer is not considered, the Halton sequence is used for quasi-Monte Carlo, which is for heat exchanger at some temperature and pressure and Re outlet conditions computation, the probabilistic analysis is worked for the conclusions. As the two kinds of calculation examples shown, the header pressure loss and drop are little part to total heat exchanger pressure drop at most conditions, and the most probability density is about 0.05, the ratios of the total pressure drops to outlet pressures are very little, the constant pressure can be used for calculation of the fluids property.

Key words: porous media, product design, Monte Carlo simulation, pressure loss, pressure drop, resistance

中图分类号: 

  • TQ 053.2

图1

某板翅式换热器总图"

图2

阻力系数随Re变化曲线"

图3

拟Monte Carlo随机数"

图4

封头压损与芯体压降比值和翅片Re关系"

图6

总压降与出口压力比值和翅片Re关系"

图5

封头压降与芯体压降比值和翅片Re关系"

图7

封头压损与芯体压降比值与翅片Re关系"

图9

总压降与出口压力比值与翅片Re关系"

图8

封头压降与芯体压降比值与翅片Re关系"

图10

封头压损与芯体压降比值概率特性"

图11

封头压损与芯体压降比值概率分布"

图12

封头压降与芯体压降比值概率特性"

图13

封头压降与芯体压降比值概率分布"

图14

总压降与出口压力比值概率特性"

图15

总压降与出口压力比值概率分布"

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