Flow distribution of hydrocarbon fuel in parallel minichannels heat exchanger

Chen, Yu; Lei, Zhiliang; Zhang, Tianhao; Zhu, Quan; Bao, Zewei; Zhang, Qiyi; Li, Xiangyuan

doi:10.1002/aic.16086

Cited by 22 publications

(5 citation statements)

References 50 publications

(55 reference statements)

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“…The accuracy and applicability of all the calculating methods have been verified by our previous works. [10,28] A commercial computational fluid dynamics (CFD) software, Fluent 15.0, was used for the solution of the governing equations. All the thermophysical properties were calculated with an in-house Fortran77 code and linked to Fluent software by user define function (UDF).…”

Section: Calculation Of Thermophysical Property and Mechanism Of Pyrolysis Reactionmentioning

confidence: 99%

Effects of geometric parameters of rectangular cooling channel on pyrolysis carbon deposition in fuel‐cooled plates

et al. 2021

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In this paper, the effects of the geometric parameters of a rectangular cooling channel on the amount of pyrolysis carbon deposition in the channel unit of real fuel-cooled plates under the constraints of fixed overall plate shape and total flow rate are studied. A decoupling algorithm for simulating the carbon deposition on surfaces of three-dimensional (3D) channels is firstly established, and a carbon deposition rate model is extended for 3D channels.Using the developed method, the processes of pyrolysis carbon deposition in five fuel-cooled plates with various channel parameters are simulated. The effects of structural parameters on heat transfer, pyrolysis reaction, distribution of carbon deposition, and total carbon deposition amount are discussed.The results show that the channel geometric parameters indirectly affect pyrolysis carbon deposition in two ways: by changing the wall temperature where the carbon deposition reaction occurs through affecting the heat transfer and by changing the concentration of precursors through changing the residence time of fuel. A parameter θ related to the rectangular channel structure and the number of channels is defined. Under the geometric constraints of the channel unit, the smaller design parameter θ is beneficial to reduce carbon deposition in the channel.

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Section: Calculation Of Thermophysical Property and Mechanism Of Pyrolysis Reactionmentioning

confidence: 99%

Effects of geometric parameters of rectangular cooling channel on pyrolysis carbon deposition in fuel‐cooled plates

et al. 2021

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“… 9 − 11 Moreover, the endothermic cracking process of n-decane, as a representative component and model fuel, 12 has attracted much attention from researchers. 13 , 14 During the cooling process, fuels undergo heat transfer coupled with thermal cracking and turbulent flow in a supercritical pressure state (4 MPa or higher 15 ). To accurately determine the supercritical cracking heat transfer performance of fuels in cooling channels, it is necessary to study the interaction of flow and chemical reactions.…”

Section: Introductionmentioning

confidence: 99%

“…The combustor of a supersonic aircraft has an extremely harsh thermal environment. − The regenerative cooling method is one of the best cooling technologies for rescuing this problem. , The coolant flows through cooling channels to cool the combustor walls before it is pumped into the combustion chamber. , Endothermic hydrocarbon fuels with high density and heat sink capacity due to endothermic reactions of the fuels, such as JP-7, JP-8, JP-10, and RP-3, are applied as the primary coolant. − Moreover, the endothermic cracking process of n-decane, as a representative component and model fuel, has attracted much attention from researchers. , During the cooling process, fuels undergo heat transfer coupled with thermal cracking and turbulent flow in a supercritical pressure state (4 MPa or higher). To accurately determine the supercritical cracking heat transfer performance of fuels in cooling channels, it is necessary to study the interaction of flow and chemical reactions.…”

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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“…In particular, fluid density [4], viscosity, specific heat, and the thermal diffusion coefficient change dramatically [5,6] near the quasicritical point. The buoyancy and flow acceleration caused by the change in physical parameters have a massive effect on the heat transfer of the fluid [7][8][9]. Under high temperatures, coking and carbon deposition caused by the pyrolysis of hydrocarbon fuel can also cause the blockage of regenerative cooling channels [10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Effect of Cooling Header on the Hydrocarbon Fuel Flow Distribution in a Regenerative Cooling Channel

Yin

Jiaqiang

Ding

2022

International Journal of Aerospace Engineering

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Regenerative cooling technology is the most widely used cooling technology in liquid rocket engines, and flow distribution is very important for regenerative cooling heat transfer. In this work, the flow distribution characteristics of Z -type parallel channels were studied through numerical simulation, and the effects of flow area ratio, inlet header shape, and inlet aspect ratio were analyzed. Results showed that changing the inlet cooling header can improve the uniform distribution of flow rate effectively. The nonuniformity coefficient and fuel temperature varied with change in the flow area ratio, inlet header shape, and inlet aspect ratio. The maximum temperature of the wall decreased from 1334.52 K to 1220.61 K when the flow area ratio was changed from 1 to 0.25. An appropriate decrement in the inlet header shape was beneficial to the uniform flow distribution. The inlet aspect ratio should be reduced properly to ensure that each channel experiences similar pressure drop. This research has a certain reference value for the structural design of regenerative cooling channels.

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Flow distribution of hydrocarbon fuel in parallel minichannels heat exchanger

Cited by 22 publications

References 50 publications

Effects of geometric parameters of rectangular cooling channel on pyrolysis carbon deposition in fuel‐cooled plates

Effects of geometric parameters of rectangular cooling channel on pyrolysis carbon deposition in fuel‐cooled plates

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

Effect of Cooling Header on the Hydrocarbon Fuel Flow Distribution in a Regenerative Cooling Channel

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