Heat transfer to supercritical hydrocarbon fuel in horizontal tube: Effects of near-wall pyrolysis at high heat flux

Li, Zaizheng; Liu, Guozhu; Zhang, Ruoling

doi:10.1016/j.ces.2020.115994

Cited by 22 publications

(3 citation statements)

References 43 publications

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“…Recent years see an increasing number of experimental studies on the thermal cracking characteristics and carbon deposition process of different HC fuels [6][7][8][9][10][11][12][13][14][15][16] , aiming to increase their cooling capacity from both physical and chemical heat sink approaches.…”

Section: Introductionmentioning

confidence: 99%

Cooling capacity optimization of hydrocarbon fuels for regenerative cooling

Wang

Jin

Gao

et al. 2022

Applied Thermal Engineering

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Section: Introductionmentioning

confidence: 99%

Cooling capacity optimization of hydrocarbon fuels for regenerative cooling

Wang

Jin

Gao

et al. 2022

Applied Thermal Engineering

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“…Zhao et al 38 also utilized this cracking mechanism to study the pressure effect on fuel cracking, and the results indicated that the conversion of fuel is proportional to the pressure. Li et al 39 applied improved kinetics of the aviation kerosene HF-1 40 in a CFD model to the coupling mechanism of heat transfer and thermal cracking. The results pointed out that increasing heat flux leads to local heat transfer deterioration.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigations on the Molecular Reaction Model for Thermal Cracking of n-Decane at Supercritical Pressures

et al. 2022

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The pyrolysis of endothermic hydrocarbon fuel plays a vital role in regenerative cooling channels. Based on previous experiments and mechanism models of n-decane, and considering the impact of the secondary reaction at high conversion, the present work establishes a cracking reaction model of n-decane containing 16 species and 26 reactions. One-dimensional plug flow reactor simulation verifies that the model has high accuracy in predicting species distribution. The high-accuracy model is applied to the computational fluid dynamics (CFD) simulation of the supercritical cracking heat transfer, and compared with the results of a one-step global model as the chemistry model. The results show that the high-accuracy model is more accurate in terms of fuel conversion, temperature, and product distribution. Furthermore, the reasons for the difference of the two chemistry models in the CFD simulation are analyzed from the perspective of chemical kinetics. The new model generates more products of small molecules due to the consideration of secondary reactions. However, for the one-step model, it mainly cracked into large molecules even at high conversion. The product distribution affects the chemical endotherm and then the fuel temperature, which in turn affects the reaction rate and finally the conversion of the fuel. In addition, pyrolysis affects the properties of the fuel, which in turn affects the convective heat transfer. Among the several influencing factors of heat transfer, the correction factor of isobaric specific heat, which is the ratio of the specific heat of fluid to the average specific heat, can well reflect the changing trend of the convective heat transfer coefficient. The present work demonstrates the important role of the kinetic model in the simulation of the supercritical cracking heat transfer process, and the corresponding methods can be used in the design of regenerative cooling systems.

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“…Based on their experimental studies, Li et al [22] proposed a simplified molecular reaction kinetic model of high accuracy that can be used to simulate the pyrolysis of supercritical endothermic hydrocarbon fuels in heated tubes. Li et al [23] also found that pyrolysis would enhance the heat transfer when heat flux is relatively low while the influence of pyrolysis on heat transfer at higher heat flux is much more complicated. The work of Xu et al [24] indicated that the ribbed surface would greatly improve the heat transfer in the channel, leading to lower wall temperature and weakens the pyrolysis of the endothermic fuel.…”

Section: Introductionmentioning

confidence: 99%

A Parametrical Study on Convective Heat Transfer between High-Temperature Gas and Regenerative Cooling Panel

Wang

Zhang

et al. 2021

Energies

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Thermal protection is still one of the key challenges for successful scramjet operations. In this study, the three-dimensional coupled heat transfer between high-temperature gas and regenerative cooling panel with kerosene of supercritical pressure flowing in the cooling channels was numerically investigated to reveal the fundamental characteristics of regenerative cooling as well as its influencing factors. The SST k-ω turbulence model with low-Reynolds-number correction provided by the pressure-based solver of Fluent 19.2 is adopted for simulation. It was found that the heat flux of the gas heated surface is in the order of 106 W/m2, and it declines along the flow direction of gas due to the development of boundary layer. Compared with cocurrent flow, the temperature peak of the gas heated surface in counter flow is much higher. The temperature and heat flux of the gas heated surface both rises with the static pressure and total temperature of gas. The heat flux of the gas heated surface increases with the mass flow rate of kerosene, and it hardly changes with the pressure of kerosene. Results herein could help to understand the real heat transfer process of regenerative cooling and guide the design of thermal protection systems.

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Heat transfer to supercritical hydrocarbon fuel in horizontal tube: Effects of near-wall pyrolysis at high heat flux

Cited by 22 publications

References 43 publications

Cooling capacity optimization of hydrocarbon fuels for regenerative cooling

Cooling capacity optimization of hydrocarbon fuels for regenerative cooling

Numerical Investigations on the Molecular Reaction Model for Thermal Cracking of n-Decane at Supercritical Pressures

A Parametrical Study on Convective Heat Transfer between High-Temperature Gas and Regenerative Cooling Panel

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