Design of a Gamma Densitometer for Hydrocarbon Fuel at High Temperature and Supercritical Pressure

2014 ◽  
Vol 59 (11) ◽  
pp. 3335-3343 ◽  
Author(s):  
Zhuqiang Yang ◽  
Qincheng Bi ◽  
Yong Guo ◽  
Zhaohui Liu ◽  
Jianguo Yan ◽  
...  
Keyword(s):  
High Temperature ◽  
Hydrocarbon Fuel ◽  
Supercritical Pressure ◽  
Gamma Densitometer

The influences of variable sectional area design on improving the hydrocarbon fuel flow distribution in parallel channels under supercritical pressure

Fuel ◽  
2018 ◽  
Vol 233 ◽  
pp. 442-453 ◽  
Author(s):  
Yuguang Jiang ◽  
Jiang Qin ◽  
Yaxing Xu ◽  
Wenli Yu ◽  
Silong Zhang ◽  
...  
Keyword(s):  
Flow Distribution ◽  
Hydrocarbon Fuel ◽  
Supercritical Pressure ◽  
Sectional Area ◽  
Fuel Flow ◽  
Parallel Channels

Vibration Effects on Surface Coke Deposition of Hydrocarbon Fuel at Supercritical Pressure Condition in Micro-Tubes

2013 ◽  
Author(s):  
Yanchen Fu ◽  
Zhi Tao ◽  
Guoqiang Xu ◽  
Hongwu Deng
Keyword(s):  
Heat Transfer ◽  
Flow Resistance ◽  
Stable Condition ◽  
Hydrocarbon Fuel ◽  
Constant Heat Flux ◽  
Supercritical Pressure ◽  
Coke Deposition ◽  
Wave Crest ◽  
Vibration Energy ◽  
Constant Heat

Experiments are performed to study vibration effects on surface coke deposition of aviation hydrocarbon RP-3 under supercritical pressure. The flowing RP-3 kerosene is stressed to 5MPa, and heated up from 127°C to 450°C in a stainless tube (1.8mm I.D., 2.2mm O.D., 1Cr18Ni9Ti) with a constant heat flux, and the mass flow rate is 3g/s. The working fluids flow downward through an 1800mm long tube. The vibration frequency is set from 100Hz to 600Hz, covering the main frequencies of the combustion chamber vibration when it works. Compared with stable condition, vibration effects have a distinct impact on the flow resistance and heat transfer. The amount of coke deposition reduced under all different frequencies with the maximize decline of 40.46%. Moreover, restraining efficiency is proportional to the vibration energy. Besides, vibration enhanced the heat transfer, the coefficient of which comes to a wave crest at the zone of second-order modes of response to the peak area with the biggest vibration energy.

A modified silicic acid (Si) and sulphuric acid (S)–ZrP/PTFE/glycerol composite membrane for high temperature direct hydrocarbon fuel cells

2013 ◽  
Vol 224 ◽  
pp. 158-167 ◽  
Author(s):  
Amani Al-Othman ◽  
André Y. Tremblay ◽  
Wendy Pell ◽  
Sadok Letaief ◽  
Yun Liu ◽  
...  
Keyword(s):  
Fuel Cells ◽  
High Temperature ◽  
Sulphuric Acid ◽  
Silicic Acid ◽  
Composite Membrane ◽  
Hydrocarbon Fuel

Numerical Study of Pyrolysis Effects on Supercritical-Pressure Flow and Conjugate Heat Transfer of N-Decane in the Square Channel

2017 ◽  
Author(s):  
Xizhuo Hu ◽  
Zhi Tao ◽  
Jianqin Zhu ◽  
Haiwang Li
Keyword(s):  
Heat Transfer ◽  
High Temperature ◽  
Conjugate Heat Transfer ◽  
Supercritical Pressure ◽  
Operating Conditions ◽  
Strong Impact ◽  
Heat Absorption ◽  
Regenerative Cooling ◽  
Flow And Heat Transfer ◽  
Bottom Interface

Regenerative cooling has become the most effective and practical method of thermal protection to the high temperature structures of scramjet engines. Pyrolytic reactions of endothermic hydrocarbon fuel have significant influence on the regenerative cooling process at high temperature due to a large amount of heat absorption and fluid components change. In this paper, a three-dimensional (3D) model is developed for numerically investigating the flow and heat transfer of pyrolytic reacted n-decane in the square engine cooling channel under supercritical pressure with asymmetrical heating imposed on the bottom channel surface. The one-step global pyrolytic reaction mechanism consisting of 18 species is adopted to simulate the pyrolysis process of n-decane. The governing equations for species continuum, momentum, energy and the k-ω turbulence equation are properly solved, with accurate computations of the thermophysical and transport properties of fluid mixture, which undergo drastic variations and exert strong impact on fluid flow and heat transfer process in the channel. The numerical method is validated based on the good agreement between the current predictions and the experimental data. Numerical studies of the pyrolysis effects on the characteristics of flow resistance and conjugate heat transfer under various operating conditions have been conducted. Results reveal that pyrolysis intensively takes place in high temperature regions. The pressure drop along the channel steeply rise due to the further fluid acceleration caused by pyrolysis. It is found that the variations of heat flux at the bottom, top and side fluid-solid-interface walls are totally different. Pyrolysis could lead to greater heat transfer enhancement at the bottom interface, consequently, more heat is transferred into the fluid region through the bottom interface. The dual effects of heat absorption and enhanced heat transfer caused by pyrolysis produce strong influence on the wall temperature. The mechanism of these physicochemical phenomena are also analyzed in detail, which is conducive to fundamentally understand the complicated physicochemical process of regenerative cooling. The present work has profound significance for the development of regenerative cooling technology.

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