Experimental Study on Influences of Physical Factors to Supercritical RP-3 Surface and Liquid-Space Thermal Oxidation Coking

Tao, Zhi; Fu, Yanchen; Xu, Guoqiang; Deng, Hongwu; Jia, Zhouxia

doi:10.1021/ef5011868

Cited by 44 publications

(13 citation statements)

References 26 publications

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“…The dissolved oxygen concentration and the mass flow rate affect the material balance of the chemical reaction and the residence time, respectively, thus affecting the characteristics of thermal oxidative coking. Tao et al . and Zhu et al also drew similar conclusions from their studies on the thermal oxidative coking of aviation kerosene RP-3 in the smooth pipe.…”

Section: Introductionmentioning

confidence: 58%

Experimental Investigation of Flow Coking and Coke Deposition of Supercritical Hydrocarbon Fuels in Porous Media

et al. 2018

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Transpiration cooling technology is a feasible thermal protection method for hypersonic vehicles. To ensure the safety of transpiration cooling structures, the coke deposition rule of hydrocarbon fuels in porous media is a key problem that has to be considered. In this paper, experimental studies are reported on coke deposition of n-decane and HF-II fuel in sintered bronze porous media at different pressures and a temperature ranging from 350 to 638 °C. Results showed that the temperature was a dominant factor for coke generation from hydrocarbon fuels. Two types of coking behaviors, i.e., thermal-oxidative coking and pyrolysis coking, were observed, which resulted in the coke surface deposition rate exhibiting a double-peak curve. At a certain temperature, the mass flow rate determined the fluid residence time in porous channels. Thermal-oxidative coking was affected by the residence time and the dissolved oxygen concentration, so the coke surface deposition rate increased at first and then decreased with the mass flow rate. However, pyrolysis coking was only affected by the residence time, and in this case, the coke surface deposition rate decreased monotonously with the mass flow rate.

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Section: Introductionmentioning

confidence: 58%

Experimental Investigation of Flow Coking and Coke Deposition of Supercritical Hydrocarbon Fuels in Porous Media

et al. 2018

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“…The setup experimental facility for thermal stressing of RP-3 is shown in Figure . Some details of the system have been described in previous studies. − As shown in Figure , the overall test system could be separated into four sub-systems: fuel supply system, heating system, data acquisition system, and cooling system. The fuel supply system prepares the fuel to the desired experimental conditions.…”

Section: Methodsmentioning

confidence: 99%

Surface Deposition Characteristics of Supercritical Kerosene RP-3 Fuel within Treated and Untreated Stainless-Steel Tubes. Part 1: Short Thermal Duration

Tao

Jia

2016

Energy Fuels

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The thermal oxidation deposition characteristics of kerosene RP-3 have been experimentally studied in the vertical tube at supercritical pressure as a crucial concern for the cooled cooling air (CCA) development. Thermal stressing of the fuel was carried out in a heated tube with stainless steel 321 (SS321, 1Cr18Ni9Ti), pre-oxidized, and electrolytically passivated for 1 h. Under the constant pressure of 5 MPa, all of the experiments were conducted at the fixed inlet and outlet fuel temperatures of 400 and 723 K, respectively, under the same heat flux and flow mass rate. Deposition of the different segments was analyzed using a weighting method to observe the deposition profile of the test section. Moreover, the morphology and components of the surface deposition were examined along each tube, with different surface treatments, to investigate the surface thermal oxidative deposit mechanisms. In this work, it was found that the pre-oxidized and electrolytically passivated treatments could reduce the total deposition about 35.83 and 58.33%, respectively, as a result of the formed passivation layer and reduced surface roughness in the treated progress in contrast to the as-received SS321 tube. On the basis of the scanning electron microscopy (SEM) images and component analysis of the surface deposit, the thermal oxidation deposit on the treated tube surface could be attributed to the adhered deposit formed in the liquid fuel rather than the surface catalytic filamentous deposition on the untreated tubes.

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“…The temperature measurement error was ±1.5 °C. In the flowing system, the three common methods to measure the deposition are carbon burnoff, pressure difference method, and weight method . In the carbon burnoff method, a multiphase carbon analyzer is applied to determine the products of the burned deposition.…”

Section: Methodsmentioning

confidence: 99%

Flow Pattern Effects on the Oxidation Deposition Rate of Aviation Kerosene

2015

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The thermal stability characteristics of aviation kerosene were investigated using a heated tube at a constant heat power of 1087 W, mass flow rate of 1 g/s, and supercritical pressure of 3 MPa. Deposition rates on the tube walls were measured by weight. Each test lasts for 105 min. The inner diameter of the reactor was varied at 2, 4, and 6 mm to simulate different flow patterns, including residence time, Reynolds number, and temperature. Various flow states in local sections were taken to investigate the effect of Reynolds numbers on the deposition rate, including sub- and supercritical temperatures and laminar, transition, and turbulent flow. It is shown that the influences of Reynolds numbers on the deposition mainly depend upon the thickness of sublayer, where the oxidative deposit precursors are formed. The deposition rate correlation is modified by the experimental data in the laminar flow regime. Turbulent pattern and supercritical temperature enhance heat transfer of fluid and the mass transfer of oxidative deposits to the wall.

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Experimental Study on Influences of Physical Factors to Supercritical RP-3 Surface and Liquid-Space Thermal Oxidation Coking

Cited by 44 publications

References 26 publications

Experimental Investigation of Flow Coking and Coke Deposition of Supercritical Hydrocarbon Fuels in Porous Media

Experimental Investigation of Flow Coking and Coke Deposition of Supercritical Hydrocarbon Fuels in Porous Media

Surface Deposition Characteristics of Supercritical Kerosene RP-3 Fuel within Treated and Untreated Stainless-Steel Tubes. Part 1: Short Thermal Duration

Flow Pattern Effects on the Oxidation Deposition Rate of Aviation Kerosene

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