...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>International Journal of Thermal Sciences >Experimental investigation on thermal cracking and convective heat transfer characteristics of aviation kerosene RP-3 in a vertical tube under supercritical pressures
【24h】

Experimental investigation on thermal cracking and convective heat transfer characteristics of aviation kerosene RP-3 in a vertical tube under supercritical pressures

机译：超临界压力下垂直管中航空煤油RP-3热裂纹和对流传热特性的实验研究

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

This study experimentally investigated the pyrolysis and heat transfer characteristics of a specific EHF (aviation kerosene RP-3) flowing in a vertical upward tube under supercritical pressures (2.5-5.5 MPa). Three wall heat flux conditions, i.e. 700, 950, and 1240 kW/m(2) are designed to represent the condition with no significant cracked, mildly cracked, and deeply cracked of fuel, respectively. The results show that the elevated pressure could impact on the reaction pathway of alkanes and alkenes, resulting in a smaller alkene/alkane ratio and less endothermicity. A promoting effect of the elevated pressure and heat flux on the conversion and gas yield is confirmed in this work. Then heat transfer characteristics are analyzed in detail based on the wall temperature and the local (apparent)/average HTC distributions. The buoyancy effect causes the deterioration of heat transfer under high heat flux. The elevated pressure decreases the maximum wall temperature whereas enlarges the range of heat transfer deterioration region. A conclusion could be obtained that the increase of pressure has little effect on alleviating of heat transfer deterioration under rather large heat flux conditions. The average HTCs in the cracked region is twice larger than that in the non-cracked region, indicating that the pyrolysis improves the heat transfer of fuel. Besides, it is found that the influence of pressure on heat transfer characteristic is dominated by the isobaric specific heat capacity and density in the non-cracked region and the cracked region, respectively. Furthermore, the effect of pyrolysis on heat transfer deterioration is investigated. It is found that the strong pyrolysis reaction near the wall is beneficial to lower the wall temperature in the HTD region, and the buoyancy effect is not significantly increased by the further decrease in fluid density caused by pyrolysis.
机译：本研究通过实验研究了在超临界压力（2.5-5.5MPa）下在垂直向上管中流动的特定EHF（航空煤油RP-3）的热解和传热特性。三个壁热通量条件，即700,950和1240 kW / m（2）旨在表示没有显着裂纹，温和的裂纹和燃料深度破裂的条件。结果表明，升高的压力可能会对烷烃和烯烃的反应途径产生影响，导致烯烃/烷烃比和吸热较少。在这项工作中证实了升高压力和热通量对转化和气体产量的促进效果。然后基于壁温和局部（表观）/平均HTC分布详细分析传热特性。浮力效应导致高热通量在高热通量下的热传递劣化。升高的压力降低了最大壁温，而扩大了传热劣化区域的范围。可以获得结论的是，增加压力的增加几乎没有对减轻相当大的热通量条件下的传热劣化的影响。裂纹区域中的平均HTC在非破裂区域中的两倍，表明热解改善了燃料的热传递。此外，发现压力对传热特性的影响分别由非裂纹区域和裂纹区域中的异常比热容和密度主导。此外，研究了热解对传热劣化的影响。结果发现，壁附近的强热解反应有利于降低HTD区域的壁温，并且通过热解引起的流体密度的进一步降低，浮力效果不会显着增加。

著录项

  • 来源
  • 作者

    Jiao Si; Li Sufen; Pu Hang; Dong Ming; Shang Yan;

  • 作者单位

    Dalian Univ Technol Minist Educ Key Lab Ocean Energy Utilizat &

    Energy Conservat Sch Energy &

    Power Engn Dalian 116024 Peoples R China;

    Dalian Univ Technol Minist Educ Key Lab Ocean Energy Utilizat &

    Energy Conservat Sch Energy &

    Power Engn Dalian 116024 Peoples R China;

    Dalian Univ Technol Minist Educ Key Lab Ocean Energy Utilizat &

    Energy Conservat Sch Energy &

    Power Engn Dalian 116024 Peoples R China;

    Dalian Univ Technol Minist Educ Key Lab Ocean Energy Utilizat &

    Energy Conservat Sch Energy &

    Power Engn Dalian 116024 Peoples R China;

    Dalian Univ Technol Minist Educ Key Lab Ocean Energy Utilizat &

    Energy Conservat Sch Energy &

    Power Engn Dalian 116024 Peoples R China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 热力工程、热机;
  • 关键词

    RP-3; Supercritical pressures; Pyrolysis; Heat transfer;

    机译：RP-3;超临界压力;热解;传热;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号