Kinetics and modeling of supercritical pyrolysis of endothermic hydrocarbon fuels in regenerative cooling channels

Li, Zaizheng; Wang, Hongyan; Jing, Kai; Wang, Limin; Liu, Yu; Zhang, Xiangwen; Liu, Guozhu

doi:10.1016/j.ces.2019.06.019

Cited by 45 publications

(12 citation statements)

References 32 publications

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“…During the flight of hypersonic vehicles (Mach > 5), the surface temperature of the combustion chamber increases sharply because of severe friction between the vehicles and air . Endothermic hydrocarbon fuels that can serve as both the propellant and coolant have been used to solve the thermal management problems of hypersonic vehicles. − They can not only provide a powerful driving force for hypersonic vehicles but also absorb heat through physical and chemical heat sinks. − exo -Tetrahydrodicyclopentadiene (Figure a), as a high energy-density hydrocarbon, possessing many advantages, such as suitable flash point, low freezing point, and high heat sink capability, is one candidate of advanced functional fuels. It is usually applied as a single-component jet fuel for volume-limited aviation combustion chambers. − However, the application of exo -tetrahydrodicyclopentadiene is limited to a certain extent by its poor properties of fluidity, ignition, and combustion which are related to its relatively high viscosity and high carbon to hydrogen ratio (C/H) …”

Section: Introductionmentioning

confidence: 99%

Density and Viscosity Measurements on the Ternary System of exo-Tetrahydrodicyclopentadiene (1) + n-Decane (2) + Iso-Butanol (3) and Corresponding Binary Systems

Zhao

Dai

et al. 2020

J. Chem. Eng. Data

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exo-Tetrahydrodicyclopentadiene can serve as both the propellant and coolant in hypersonic vehicles. However, its applications are restricted by the poor properties of ignition and combustion to some extent. Fuel additives such as appropriate alcohols have the ability to overcome these deficits. Research on thermophysical properties of the mixtures composed of exo-tetrahydrodicyclopentadiene and fuel additives can provide important information for the research of fuel additives. In this work, densities and viscosities of the ternary system of exotetrahydrodicyclopentadiene (1) + n-decane (2) + iso-butanol (3) and three corresponding binary systems have been measured over the whole composition range in the temperature range from 293.15 to 333.15 K with an interval of 5 K and at pressure p = 0.1 MPa. The values of excess molar volumes (V m E ) and viscosity deviations (Δη) of three binary systems and the ternary system were calculated and then fitted to the Redlich−Kister equation and four semiempirical equations, respectively. The variations of V m E and Δη were explained from the viewpoints of intermolecular forces and structural effects. Furthermore, the Jouyban−Acree model was used to correlate the values of densities (ρ) and viscosities (η) of the studied mixtures with high accuracy.

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Section: Introductionmentioning

confidence: 99%

Density and Viscosity Measurements on the Ternary System of exo-Tetrahydrodicyclopentadiene (1) + n-Decane (2) + Iso-Butanol (3) and Corresponding Binary Systems

Zhao

Dai

et al. 2020

J. Chem. Eng. Data

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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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“…Due to the serious friction between the aircraft and the air, the surface temperature of the combustion chamber rises sharply, thus causing certain safety problems during the flight of a hypersonic vehicle . In order to solve this problem, researchers have developed endothermic hydrocarbon fuels as both a coolant and a propellant. − They can absorb heat through physical and chemical interactions − …”

Section: Introductionmentioning

confidence: 99%

Densities and Viscosities of the Ternary System exo-Tetrahydrodicyclopentadiene (1) + n-Decane (2) + 1,2,3,4-Tetrahydronaphthalene (3) and the Corresponding Binary Systems at T = (293.15–333.15) K

Dai

Wang

et al. 2021

J. Chem. Eng. Data

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The densities (ρ) and viscosities (η) of the ternary system exo-tetrahydrodicyclopentadiene + n-decane + 1,2,3,4-tetrahydronaphthalene and the three corresponding binary systems, exo-tetrahydrodicyclopentadiene + n-decane, 1,2,3,4-tetrahydronaphthalene + n-decane, and exo-tetrahydrodicyclopentadiene + 1,2,3,4-tetrahydronaphthalene, were measured at temperatures ranging from 293.15 to 333.15 K and at pressure p = 0.1 MPa. The densities and viscosities were determined using a vibrating-tube densimeter and an automatic microviscometer based on the rolling ball principle, respectively. The values of excess molar volumes (V m E) and the viscosity deviations (Δη) of every mixture were calculated with the measured data. The V m E and Δη values of the three binary systems and the ternary system were fitted to the Redlich–Kister equation and four semi-empirical equations, respectively. The V m E values are negative for the binary systems of exo-tetrahydrodicyclopentadiene + n-decane and 1,2,3,4-tetrahydronaphthalene + n-decane with the minimum at about x = 0.5, while the V m E value of the binary system exo-tetrahydrodicyclopentadiene + 1,2,3,4-tetrahydronaphthalene is positive with the maximum at x = 0.5. The Δη values of the three binary systems are negative over the entire concentration range. For the ternary system, the V m E values are positive when exo-tetrahydrodicyclopentadiene and 1,2,3,4-tetrahydronaphthalene are dominant. Otherwise, the V m E values turn out to be negative. The Δη values are negative over the entire concentration range. These phenomena can be explained by physical interactions and structural effects between components.

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Kinetics and modeling of supercritical pyrolysis of endothermic hydrocarbon fuels in regenerative cooling channels

Cited by 45 publications

References 32 publications

Density and Viscosity Measurements on the Ternary System of exo-Tetrahydrodicyclopentadiene (1) + n-Decane (2) + Iso-Butanol (3) and Corresponding Binary Systems

Density and Viscosity Measurements on the Ternary System of exo-Tetrahydrodicyclopentadiene (1) + n-Decane (2) + Iso-Butanol (3) and Corresponding Binary Systems

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

Densities and Viscosities of the Ternary System exo-Tetrahydrodicyclopentadiene (1) + n-Decane (2) + 1,2,3,4-Tetrahydronaphthalene (3) and the Corresponding Binary Systems at T = (293.15–333.15) K

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