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紧凑翅片管式空气-燃油换热器试验

刘启航 闻洁 吕璐璐 刘银龙 庄来鹤 董苯思

刘启航, 闻洁, 吕璐璐, 等. 紧凑翅片管式空气-燃油换热器试验[J]. 航空动力学报, 2023, 38(12):2848-2860 doi: 10.13224/j.cnki.jasp.20220002
引用本文: 刘启航, 闻洁, 吕璐璐, 等. 紧凑翅片管式空气-燃油换热器试验[J]. 航空动力学报, 2023, 38(12):2848-2860 doi: 10.13224/j.cnki.jasp.20220002
LIU Qihang, WEN Jie, LÜ Lulu, et al. Experiment of compact finned-tube air-fuel heat exchanger[J]. Journal of Aerospace Power, 2023, 38(12):2848-2860 doi: 10.13224/j.cnki.jasp.20220002
Citation: LIU Qihang, WEN Jie, LÜ Lulu, et al. Experiment of compact finned-tube air-fuel heat exchanger[J]. Journal of Aerospace Power, 2023, 38(12):2848-2860 doi: 10.13224/j.cnki.jasp.20220002

紧凑翅片管式空气-燃油换热器试验

doi: 10.13224/j.cnki.jasp.20220002
基金项目: 国家重大科技专项(J2019-Ⅲ-0021-0065)
详细信息
    作者简介:

    刘启航(1992-),男,博士生,主要从事航空发动机热管理相关研究。 E-mail:liuqihang@buaa.edu.cn

    通讯作者:

    闻洁(1964-),女,研究员、博士生导师,博士,主要从事航空发动机气动热力及工程热物理相关研究。 E-mail:wenjie@buaa.edu.cn

  • 中图分类号: V231.2

Experiment of compact finned-tube air-fuel heat exchanger

  • 摘要:

    为实现航空发动机内部热环境与热沉的有效交互,探究换热元件的流动换热特性。以航空发动机燃油系统回油冷却换热器为例,开展了小管径矩形翅片管式空气-燃油换热器流动换热性能试验研究。试验采用高温燃油与常温空气两股工质在换热器中进行能量交换,探究换热器在不同工况下的流动与换热性能,获取矩形翅片管式换热单元管外流动换热经验关联式。结果表明:矩形翅片管式换热单元的表面传热系数约为相同结构参数光滑管束换热单元的44%,且试验结构换热单元阻力系数高于光滑管束单元,在进行翅片管束换热器设计时应综合考虑翅片对流动换热性能的影响。试验获取的翅片管式换热单元管外努塞尔数经验关联式与阻力系数经验关联式拟合偏差均不超过5%,较为准确地反应了换热单元外侧的流动换热特性。

     

  • 图 1  SABRE预冷换热器结构示意图[5]

    Figure 1.  Structure schematic diagram of SABRE pre-cooling heat exchanger[5]

    图 2  矩形翅片管式换热单元

    Figure 2.  Rectangular finned-tube heat transfer unit

    图 3  翅片管式换热单元结构图

    Figure 3.  Structure diagram of finned-tube heat transfer unit

    图 4  翅片管式换热器实物图

    Figure 4.  Picture of the finned-tube heat exchanger

    图 5  翅片管式换热器试验台结构简图

    Figure 5.  Structure diagram of experiment system for finned-tube heat exchanger

    图 6  翅片效率CFD验证

    Figure 6.  CFD verification for fin efficiency

    图 7  3种翅片效率计算方法对比

    Figure 7.  Comparison of fin efficiency by three methods

    图 8  试验工况

    Figure 8.  Working conditions of experiment

    图 9  各试验工况换热量

    Figure 9.  Heat transfer rate for each experiment working condition

    图 10  各试验工况热不平衡度

    Figure 10.  Thermal balance deviation for each experiment working condition

    图 11  空气侧努塞尔数与雷诺数关系

    Figure 11.  Correlation of air side Nu versus Reynolds number

    图 12  空气侧努塞尔数与文献经验关联式对比

    Figure 12.  Comparison of air side Nu with literature correlations

    图 13  燃油侧阻力系数对比

    Figure 13.  Comparison of the fuel side f

    图 14  空气侧阻力系数与雷诺数关系

    Figure 14.  Correlation of air side f versus Reynolds number

    图 15  空气侧阻力系数与文献经验关联式对比

    Figure 15.  Comparison of air side f with literature correlations

    表  1  翅片管式换热器结构参数

    Table  1.   Structure parameters of finned-tube heat exchanger

    结构变量数值结构变量数值
    换热管外径/mm2.2单管总长/m5.63
    换热管内径/mm1.8高度/mm400
    横向排数10横向宽度/mm52
    纵向排数28纵向长度/mm126
    纵向每排进油管数
    2弯头直径/mm9
    管子总数20翅片厚度/mm0.2
    S1/mm4.8翅片层数176
    S2/mm4.5翅片间距/mm2.2
    下载: 导出CSV

    表  2  试验工况分组及参数范围

    Table  2.   Groups for working condition and parameter range

    工况燃油流量/(kg/s)空气流量/(kg/s)燃油温度/K
    第1组0.1920.135~0.285440
    第2组0.1770.135~0.285450
    第3组0.1530.135~0.285470
    第4组0.1530.232455~535
    下载: 导出CSV

    表  3  相关顺排结构Nu经验关联式

    Table  3.   Literature Nu correlation for related structures

    公式换热单元结构及Nu经验关联式
    Schmidt公式[26]$ Nu{\text{ = 0}}{\text{.3}}R{e^{{\text{0}}{\text{.625}}}}{\left( {{{{A_{{\text{lf}}}}} \mathord{\left/ {\vphantom {{{A_{{\text{lf}}}}} {{A_{{\text{lr}}}}}}} \right. } {{A_{{\text{lr}}}}}}} \right)^{{{ - 0}}{\text{.375}}}}P{r^{{\text{1/3}}}} $
    圆管高圆翅-当量尺寸为圆管外径dr
    Groehn公式[31]$ Nu{\text{ = 0}}{{.072\;9}}R{e^{{\text{0}}{\text{.74}}}}P{r^{{\text{0}}{\text{.36}}}} $
    圆管矮圆翅-当量尺寸为圆管外径dr
    Wen公式[26]$ Nu{\text{ = 0}}{\text{.161}}R{e^{{\text{0}}{\text{.579}}}}P{r^{{\text{0}}{\text{.333}}}}{\left( {{{Pr} \mathord{\left/ {\vphantom {{Pr} {P{r_{\text{w}}}}}} \right. } {P{r_{\text{w}}}}}} \right)^{{\text{0}}{\text{.25}}}} $
    圆管矩形翅片-当量尺寸为圆管外径dr
    Vampola公式[27]$ Nu = 0.251{{Re} ^{0.67}}{\left( {\dfrac{{{S_1} - {d_{\text{r}}}}}{{{d_{\text{r}}}}}} \right)^{ - 0.2}}{\left( {\dfrac{{{S_1} - {d_{\text{r}}}}}{{{S_{\text{f}}}}} + 1} \right)^{ - 0.2}}{\left( {\dfrac{{{S_1} - {d_{\text{r}}}}}{{{S_2} - {d_{\text{r}}}}}} \right)^{0.4}} $
    圆管矩形翅片-当量尺寸为换算尺寸de
    Lyu公式[18]$ Nu{\text{ = 0}}{{.157\;75}}R{e^{{\text{0}}{{.612\;47}}}}{\left( {{{{S_{\text{f}}}} /{{d_{\text{r}}}}}} \right)^{0.062}} $
    圆管矩形翅片-当量尺寸为换算尺寸de
    Gnielinski公式[28]$ N{u_{\text{i}}} = \left\{ \begin{gathered} \frac{{{{{f_{\text{h}}}} /8} \cdot \left( {R{e_{\text{i}}} - 1\;000} \right)P{r_{\text{i}}}}}{{1 + 12.7{{\left( {{{{f_{\text{h}}}} / 8}} \right)}^{0.5}}\left( {Pr_{\text{i}}^{{2/ 3}} - 1} \right)}}\quad\quad\quad\quad\quad R{e_{\text{i}}} < {10^4} \\ \frac{{{{{f_{\text{h}}}} / 8} \cdot R{e_{\text{i}}}P{r_{\text{i}}}}}{{1 + {{900} /{R{e_{\text{i}}}}} + 12.7{{\left( {{{{f_{\text{h}}}} /8}} \right)}^{0.5}}\left( {Pr_{\text{i}}^{{2/3}} - 1} \right)}}\quad R{e_{\text{i}}} > {10^4} \\ \end{gathered} \right. $
    $ f = { (1.82{\rm{lg}}R{e_{\rm{i}}} - 1.64) ^{ - 2}} $矩形通道-当量尺寸为水力直径
    Zhukauskas公式[28]$ Nu{\text{ = 0}}{\text{.27}}R{e^{{\text{0}}{\text{.63}}}}P{r^{{\text{0}}{\text{.36}}}} $
    顺排管束-当量尺寸为圆管外径dr
    下载: 导出CSV

    表  4  相关顺排结构f经验关联式

    Table  4.   Literature f correlation for related structures

    公式换热单元结构及f经验关联式
    Vampola公式[27]$f = 1.463{ {Re} ^{ - 0.245} }{\left( {\dfrac{ { {S_1} - {d_{\text{r} } } }}{ { {d_{\text{r} } } } } } \right)^{ - 0.9} }{\left( {\dfrac{ { {S_1} - {d_{\text{r} } } }}{ { {S_{\text{f} } } }} + 1} \right)^{0.7} }{\left( {\dfrac{ { {d_{\text{e} } } }}{ { {d_{\text{r} } } } } } \right)^{0.9} }$
    圆管矩形翅片-当量尺寸为换算尺寸de
    Wen公式[26]$ f{\text{ = 0}}{\text{.44}} \cdot {f_{{\text{Vampola}}}} $
    圆管矩形翅片-当量尺寸为换算尺寸de
    Lyu公式[18]$Nu{\text{ = 0} }{ {.157\;75} }R{e^{ {\text{0} }{{.612\;47} } } }{\left( { { { {S_{\text{f} } } } / { {d_{\text{r} } } } } } \right)^{0.062} }$
    圆管矩形翅片-当量尺寸为换算尺寸de
    锅炉手册公式[32]$ \psi = {{\left( {{S_1} - {d_{\rm{o}}}} \right)} / {\left( {{S_2} - {d_{\rm{o}}}} \right)}} $
    $\begin{gathered} f = 0.38{N_L}{\left( { { { {S_1} } / { {d_{\rm{o} } } } } - 1} \right)^{ - 0.5} }{\left( {\psi - 0.94} \right)^{ - 0.59} }R{e_{\rm{o} } }^{ { { - 0.2} /{ {\psi ^2} } } } \\ (1 < \psi \leqslant 8) \end{gathered}$
    光滑圆形管束-当量尺寸为圆管外径dr
    Filonenko公式[28]$f = { (1.82{\rm{l} }{ {\rm{g} } }R{e_{\rm{i} } } - 1.64) ^{ - 2} }$
    矩形通道-当量尺寸为水力直径
    下载: 导出CSV
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  • 收稿日期:  2022-01-04
  • 网络出版日期:  2023-09-12

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