Supercritical Heat Transfer Characteristics of Hydrocarbon Fuel with Pyrolysis in Corrugated Tubes

被引：0

作者：

Huang S.-Z. ^{[1
]}

Zhu Q.-H. ^{[1
]}

Gao X.-W. ^{[1
]}

机构：

[1] Aeronautics and Astronautics, Dalian University of Technology, Dalian

来源：

Tuijin Jishu/Journal of Propulsion Technology | 2019年 / 40卷 / 01期

关键词：

Active regenerative cooling; Corrugated tube; Hydrocarbon; Pyrolysis; Supercritical pressure;

D O I：

10.13675/j.cnki.tjjs.170732

中图分类号：

学科分类号：

摘要：

In order to investigate the feasibility of corrugated cooling channel for regenerative cooling system of hydrocarbon-fueled engine, a numerical method considering convective heat transfer, endothermic pyrolytic reaction, and heat conduction in solid region simultaneously was developed based on a one-step thermal cracking mechanism. Based on this, a numerical investigation on turbulent heat transfer of n-decane flowing inside corrugated tubes with endothermic pyrolysis at supercritical pressure was conducted. The effects of corrugated tube structures on heat transfer, species transport and endothermic pyrolysis were analyzed through comparison with smooth tube. Moreover, the influence of wall heat fluxes was further studied. Results reveal that corrugated tubes can significantly improve the heat transfer ability, and the averaged convective heat transfer coefficient increase by up to 40%.The velocity fluctuations induced by corrugation lead to more uniform distribution of temperature and species concentration in radial direction. It can also reduce the pyrolytic heat-absorbing rate and averaged fuel conversion. With the increasing wall heat fluxes ranging from 0.8MW/m 2 to 1.0MW/m 2 , the overall thermal performance and pyrolytic heat-absorbing rate are improved. © 2019, Editorial Department of Journal of Propulsion Technology. All right reserved.

引用

页码：95 / 106

页数：11

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