Numerical analysis of supercritical <i>n</i>-decane upward flow and heat transfer characteristics in the buffer layer of a vertical tube

Li, Yong; Sun, Feng; Xie, Gongnan; Sundén, Bengt

doi:10.1080/10407782.2019.1688049

Cited by 16 publications

(2 citation statements)

References 38 publications

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“…Numerical research : Many studies were numerically implemented to study the thermal transport of supercritical fuel but the cracking reaction was not fully considered (Li et al , 2019c; Li et al , 2020; Cheng et al , 2018; Pu et al , 2019). Fortunately, the cracking reaction was considered in some openly published literature.…”

Section: Introductionmentioning

confidence: 99%

Research status of supercritical aviation kerosene and a convection heat transfer considering thermal pyrolysis

Zhang

Xie

et al. 2022

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Purpose This paper aims to comprehensively clarify the research status of thermal transport of supercritical aviation kerosene, with particular interests in the effect of cracking on heat transfer. Design/methodology/approach A brief review of current research on supercritical aviation kerosene is presented in views of the surrogate model of hydrocarbon fuels, chemical cracking mechanism of hydrocarbon fuels, thermo-physical properties of hydrocarbon fuels, turbulence models, flow characteristics and thermal performances, which indicates that more efforts need to be directed into these topics. Therefore, supercritical thermal transport of n-decane is then computationally investigated in the condition of thermal pyrolysis, while the ASPEN HYSYS gives the properties of n-decane and pyrolysis products. In addition, the one-step chemical cracking mechanism and SST k-ω turbulence model are applied with relatively high precision. Findings The existing surrogate models of aviation kerosene are limited to a specific scope of application and their thermo-physical properties deviate from the experimental data. The turbulence models used to implement numerical simulation should be studied to further improve the prediction accuracy. The thermal-induced acceleration is driven by the drastic density change, which is caused by the production of small molecules. The wall temperature of the combustion chamber can be effectively reduced by this behavior, i.e. the phenomenon of heat transfer deterioration can be attenuated or suppressed by thermal pyrolysis. Originality/value The issues in numerical studies of supercritical aviation kerosene are clearly revealed, and the conjugation mechanism between thermal pyrolysis and convective heat transfer is initially presented.

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Section: Introductionmentioning

confidence: 99%

Research status of supercritical aviation kerosene and a convection heat transfer considering thermal pyrolysis

Zhang

Xie

et al. 2022

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“…Recently, the scramjets have been extensively concerned by scholars in various countries (Zhu et al , 2019). However, a series of thermal protection problems caused by the supersonic combustion and aerodynamic heating are encountered in the research particularly for the combustor (Li et al , 2020; Pizzarelli et al , 2016). The active regenerative cooling technology with a hydrocarbon fuel is always used to cool the combustor wall (Xu et al , 2018; Tsujikawa and Northam, 1996; Gascoin et al , 2008).…”

Section: Introductionmentioning

confidence: 99%

Effect of wall conduction on the heat transfer characteristics of supercritical n-decane in a horizontal rectangular pipe for cooling of a scramjet combustor

Xie

Sundén

2020

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Purpose The purpose of this paper is to numerically study the influence of wall conduction on the heat transfer of supercritical n-decane in the active regenerative cooling channels. Design/methodology/approach A horizontally placed rectangular pipe with a solid zone and another one without a solid zone were used. A drastic variation of thermo-physical properties was emphatically addressed. After the verification of mesh and turbulence models comparing with the experimental results, a mesh number of 4.5 M and the low Reynolds number SST k-ω turbulence model were chosen. The solution of the governing equations and the acquisition of the numerical results were executed by the commercial software FLUENT 2020 R1. Findings The numerical results indicate that there is a heat transfer deterioration (HTD) potential for the upper wall, lower wall and sidewall with the decrease of mass flux. Due to wall conduction, the distribution of the fluid temperature at spanwise-normal planes becomes uniform and this feature also takes advantage of the relatively uniform transverse velocity. For the streamwise-normal planes, the low fluid temperature appears close to the upper wall at the region near the sidewall and vice versa for the region near the centre. Undoubtedly, the secondary flow at the cross-section plays a crucial role in this process and the relatively cool mainstream is affected by the vortices. Originality/value This study warns that the wall conduction must be considered in the practical design and thermal optimization due to the sensibility of thermo-physical properties to the heat flux. The secondary flow caused by the buoyancy force (gravity) plays a significant role in the supercritical heat transfer and mixed convection heat transfer should be further studied.

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Thermal and Structural Insight into Lightweight Lattice Channels for Active Cooling Technology

et al. 2023

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Numerical analysis of supercritical n-decane upward flow and heat transfer characteristics in the buffer layer of a vertical tube

Cited by 16 publications

References 38 publications

Research status of supercritical aviation kerosene and a convection heat transfer considering thermal pyrolysis

Research status of supercritical aviation kerosene and a convection heat transfer considering thermal pyrolysis

Effect of wall conduction on the heat transfer characteristics of supercritical n-decane in a horizontal rectangular pipe for cooling of a scramjet combustor

Thermal and Structural Insight into Lightweight Lattice Channels for Active Cooling Technology

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