Experimental study of pyrolysis-combustion coupling in a regeneratively cooled combustor: Heat transfer and coke formation

Taddeo, L.; Gascoin, Nicolas; Chetehouna, Khaled; Ingenito, Antonella; Stella, F.; Bouchez, Marc; Naour, Bruno Le

doi:10.1016/j.fuel.2018.11.096

Cited by 27 publications

(3 citation statements)

References 36 publications

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“…This enhances the decomposition of the fuel which is highly dependent on temperature and further results in an increase in coking activity. 18 The typical order of residence time in the cooling channel of the SCRamjet engine is about 1 s. 10 Gascoin et al and Maurice et al confirmed a logarithmic relationship between the coking rate and residence time. 9,10 It was also found that the effect of operating pressure is difficult to analyze because it cannot be dissociated from other parameters (residence time, flow regime, convective transfers).…”

Section: Introductionmentioning

confidence: 97%

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Transient and Spatial Evolution of Clogging of Porous Material by Filtrating Particles

Najmi

Gascoin

Chetehouna

et al. 2019

Ind. Eng. Chem. Res.

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In hypersonic vehicles, regenerative cooling is used to handle the thermal load encountered in the combustion chamber. In this method, the fuel itself flows through a cooling channel and is circulated around the combustion chamber. The channel is made of porous material that enables fuel to also partially flow directly from the channel to the chamber by transpiration, which cools the wall by internal convection. The exposure of the fuel to high temperatures results in fuel pyrolysis producing carbon particles (coke). These particles are transported by the fuel and deposit inside the pores of the material resulting in a decrease of permeability of the medium. This process is very complex since it affects the heat transfers which generate the fuel pyrolysis and the formation of the particles. A test bench is developed in the current work to study the transient effect of the key parameters (i.e., filtrating mass flow rate, a load of particles in the flow) on the particles’ transport and on their spatial distribution inside the material. In the first part of the study, a porous medium with 3 mm thickness is used. It is found that with an increase in operational time, the powder mass accumulated inside the porous medium increases. In the second part of the study, different thicknesses (6, 9, and 12 mm) of porous medium are tried, to study its effect on particle transport. Particle transport is a function of pressure drop; therefore, the thickness of the porous medium is progressively increased at the same inlet mass flow rate which in turn modifies the pressure drop across the porous medium. More interestingly, the particles accumulate in the first 3 mm thickness of the upstream, while in the downstream on the opposite side of the porous material, almost no powder is found. Additionally, the pore Reynold’s number inside the porous media and the Reynold’s number of the fluid inside the permeation cell are determined to explain the transient and spatial evolution of clogging inside the porous media. In all the studied cases, the amount of powder transported through the porous media or collected downstream remains absent.

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Section: Introductionmentioning

confidence: 97%

“…The obtained results confirmed that with the increase in fuel mass flow rate there is an increase in the heat flux. This enhances the decomposition of the fuel which is highly dependent on temperature and further results in an increase in coking activity …”

Section: Introductionmentioning

confidence: 99%

Transient and Spatial Evolution of Clogging of Porous Material by Filtrating Particles

Najmi

Gascoin

Chetehouna

et al. 2019

Ind. Eng. Chem. Res.

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“…Two distinct zones characterized the appearance of a RK/gaseous oxygen and DMCP/gaseous oxygen diffusion flame: an inner luminous zone of yellow‐orange (or white) color, which is typical of laminar diffusion flames of hydrocarbons in the air [10], and an outer primarily blue flame zone. The flame of the hydrocarbon fuel often exhibited highly luminous characteristics being attributed to chemiluminescence of carbon radical containing transition state products [11]. Under the typical condition, the combustion flame intensity of DMCP was stronger than that of RK.…”

Section: Resultsmentioning

confidence: 99%

Combustion and Thermal Decomposition Research on 1,2‐Dicyclopropyl‐1‐Methyl Cyclopropane (DMCP) as High Energy Fuel for Liquid Rocket Propellants

Sun

Zhang²,

Wang³

et al. 2022

Propellants Explo Pyrotec

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1,2-Dicyclopropyl-1-methyl cyclopropane (DMCP) was found a high-energy liquid hydrocarbon propellant. A model combustion chamber was designed and manufactured to investigate the combustion performance of DMCP and Chinese rocket kerosene (RK) in comparison. Due to the higher density of DMCP, its orifice flow coefficient was 3.4 % larger than that of RK. The chamber pressure fluctuation amplitude of DMCP was within 10 % of the average pressure value. Under typical conditions, the flame intensity of DMCP combustion flame was more intense than that of RK. When the mixture ratios varied from 2.0-2.8, the characteristic velocity changes of DMCP were between 1626 m/s and 1636 m/s. It was not apparent that the characteristic velocity of DMCP was affected by the change of mixture ratio. The combustion efficiency of DMCP increased with the rise of its mixture ratio (varying between 0.902 and 0.921), higher than that of RK in a low mixture ratio. The apparent activation energy values (E) of DMCP were 202.0 kJ • mol À 1 and 202.9 kJ • mol À 1 , respectively, according to Kissinger and Flynn-Wall-Ozawa (FWO) equations.

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A coke deposition self‐removal TBCC thermal management with multi‐catalyst coating

Feng

Deng

et al. 2020

Int J Energy Res

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Experimental study of pyrolysis-combustion coupling in a regeneratively cooled combustor: Heat transfer and coke formation

Cited by 27 publications

References 36 publications

Transient and Spatial Evolution of Clogging of Porous Material by Filtrating Particles

Transient and Spatial Evolution of Clogging of Porous Material by Filtrating Particles

Combustion and Thermal Decomposition Research on 1,2‐Dicyclopropyl‐1‐Methyl Cyclopropane (DMCP) as High Energy Fuel for Liquid Rocket Propellants

A coke deposition self‐removal TBCC thermal management with multi‐catalyst coating

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