Impact of Copper Contamination on the Thermal Stability of Jet Fuels

2019 ◽  
Author(s):  
Keyword(s):  
Thermal Stability ◽  
Jet Fuels ◽  
Copper Contamination ◽  
Thermal Stability Of

scholarly journals Extended Duration Thermal Stability Test of Improved Thermal Stability Jet Fuels

1995 ◽  
Author(s):  
Gordon L. Dieterle ◽  
Kenneth E. Binns
Keyword(s):  
Thermal Stability ◽  
Heat Exchanger ◽  
Jet Fuel ◽  
Stability Test ◽  
Bulk Temperature ◽  
Jet Fuels ◽  
Test Results ◽  
Fuel Temperature ◽  
Extended Duration ◽  
Thermal Stability Of

A single-pass, dual heat exchanger system called the Extended Duration Thermal Stability Test (EDTST) system was developed for evaluating jet fuel thermal stability. Various JP-8 fuels and thermal stability additives have been evaluated in the system. The test results indicate that additives can substantially improve the thermal stability of conventional jet fuels. Relationships of bulk and wetted wall temperatures on coking deposits that form in heated tubes have also been evaluated. To date, tests conducted with EDTST have verified that additives can improve the thermal stability of JP-8 fuels. The goal of operating at wetted wall temperatures of 260°C (500°F) has been achieved. The goal for bulk fuel temperatures of 218°C (425°F) with no deposits has not been achieved. Additional additive candidates are to be evaluated in the EDTST system to identify additives that meet both the wetted wall and bulk fuel temperature goals of this program. However, if the bulk temperature goal cannot be totally achieved, the JP-8 fuel specification will most probably be changed to take advantage of the wetted wall temperature improvement already demonstrated by a JP-8+100 additive candidate.

Determination of thermal stability of jet fuels in DTS-2 unit

1978 ◽  
Vol 14 (12) ◽  
pp. 915-917
Author(s):  
V. G. Gorodetskii ◽  
E. P. Seregin ◽  
N. P. Golenev
Keyword(s):  
Thermal Stability ◽  
Jet Fuels ◽  
Thermal Stability Of

Thermal Stability Measurement of Alternative Jet Fuels Using Ellipsometry

2017 ◽  
Author(s):  
Leigh Nash ◽  
Subith Vasu
Keyword(s):  
Thermal Stability ◽  
Alternative Fuels ◽  
Jet Fuels ◽  
Deposit Thickness ◽  
Stability Measurement ◽  
Multiple Trials ◽  
Identical Test ◽  
Aviation Engines ◽  
Steel Substrates ◽  
Thermal Stability Of

Thermal stability is an important characteristic of alternative fuels that must be evaluated before they can be used in aviation engines. Thermal stability refers to the degree to which a fuel breaks down when it is heated prior to combustion. This characteristic is of great importance to the effectiveness of the fuel as a coolant and to the engine’s combustion performance. The thermal stability of Sasol IPK, a synthetic alternative to Jet-A, with varying levels of naphthalene has been studied on aluminum and stainless steel substrates at 300 to 400 °C. This was conducted using a spectroscopic ellipsometer to measure the thickness of deposits left on the heated substrates. Ellipsometry is an optical technique that measures the changes in a light beam’s polarization and intensity after it reflects from a thin film to determine the film’s physical and optical properties. It was observed that, as would be expected, increasing the temperature increased the deposit thickness for a constant concentration of naphthalene on both substrates. The repeatability of these measurements was verified using multiple trials at identical test conditions. Lastly, the effect of increasing the naphthalene concentration at a constant temperature was found to also increase the deposit thickness.

scholarly journals New, Rapid Techniques for Determining the Hydroperoxide Content, Oxidation Stability, and Thermal Stability of Jet Fuels

1994 ◽  
Author(s):  
Robert E. Kauffman
Keyword(s):  
Thermal Stability ◽  
Oxidation Stability ◽  
Analytical Techniques ◽  
Natural Antioxidants ◽  
Jet Fuels ◽  
Cyclic Voltammetric ◽  
Temperature Oxidation ◽  
Voltammetric Techniques ◽  
Mathematical Relationships ◽  
Thermal Stability Of

New, rapid analytical techniques based on cyclic voltammetry are being developed to determine the hydroperoxide contents and the thermal and thermaloxidation stabilities of different type jet fuels (straight run, hydrotreated, JP-4, and JP-5). The techniques are performed at room temperature, use less than 1 mL of fuel, and use common solvents containing different electrolytes or reactive compounds. The cyclic voltammetric techniques were used to quantify the natural antioxidants, easily oxidizable compounds, and hydroperoxides present in different type fuels. Mathematical relationships were then developed to evaluate the potential of the voltammetric results to predict the thermal and oxidative stabilities of the jet fuels determined by high temperature oxidation and thermal stability tests.

Model Studies Examining the Use of Dicyclohexylphenylphosphine to Enhance the Oxidative and Thermal Stability of Future Jet Fuels

2002 ◽  
Vol 16 (5) ◽  
pp. 1134-1140 ◽  
Author(s):  
Bruce D. Beaver ◽  
Li Gao ◽  
Mitchel G. Fedak ◽  
Michael M. Coleman ◽  
Maria Sobkowiak
Keyword(s):  
Thermal Stability ◽  
Jet Fuels ◽  
Model Studies ◽  
Thermal Stability Of

Production of Jet Fuels from Coal-Derived Liquids. Volume 15. Thermal Stability of Coal-Derived Jet Fuels

1990 ◽  
Author(s):  
Semih Eser ◽  
Chunshan Song ◽  
Ronald M. Copenhaver ◽  
Janice Perison ◽  
Harold H. Schobert
Keyword(s):  
Thermal Stability ◽  
Jet Fuels ◽  
Thermal Stability Of

Determination of thermal stability of jet fuels under dynamic conditions

1977 ◽  
Vol 13 (2) ◽  
pp. 136-139
Author(s):  
V. A. Gladkikh ◽  
E. P. Seregin ◽  
V. V. Sashevskii ◽  
A. L. Ivanov ◽  
Yu. P. Makarov
Keyword(s):  
Thermal Stability ◽  
Jet Fuels ◽  
Dynamic Conditions ◽  
Thermal Stability Of

The Ordered Phase Formation in Ti-Al-Ga Alloys

1970 ◽  
Vol 28 ◽  
pp. 440-441
Author(s):  
Shiro Fujishiro ◽  
Harold L. Gegel
Keyword(s):  
Thermal Stability ◽  
High Temperature ◽  
Titanium Alloys ◽  
Growth Kinetics ◽  
Stoichiometric Composition ◽  
Good Potential ◽  
Alpha Titanium ◽  
Cold Rolled ◽  
Kinetics Of ◽  
Thermal Stability Of

Ordered-alpha titanium alloys having a DO19 type structure have good potential for high temperature (600°C) applications, due to the thermal stability of the ordered phase and the inherent resistance to recrystallization of these alloys. Five different Ti-Al-Ga alloys consisting of equal atomic percents of aluminum and gallium solute additions up to the stoichiometric composition, Ti3(Al, Ga), were used to study the growth kinetics of the ordered phase and the nature of its interface.The alloys were homogenized in the beta region in a vacuum of about 5×10-7 torr, furnace cooled; reheated in air to 50°C below the alpha transus for hot working. The alloys were subsequently acid cleaned, annealed in vacuo, and cold rolled to about. 050 inch prior to additional homogenization

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