EFFECT OF JP-5 SULFUR CONTENT AND SEA WATER INGESTION ON HOT GAS CORROSION OF SUPER ALLOYS. PDF Download
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Languages : en
Pages : 76
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An experimental investigation was conducted to determine whether the maximum sulfur content of 0.4 weight per cent, currently allowed in grade JP-5 aviation turbine fuel, is a safe level for the protection of turbine blade alloys used in high performance engines. Specimens of two nickel-base alloys (Inconel 713C and Sierra Metal 200) were exposed to vitiated air from the Phillips 2-inch combustor (56 air-fuel ratio) at high temperature (2,000 degrees Fahrenheit), high pressure (15 atmospheres), and high velocity (500 feet per second) during a five-hour cyclic test (55 minutes fuel-on and 5 minutes fuel- off). A statistically designed test program was used to evaluate the effect of three sulfur concentration levels in the fuel (0.0002, 0.040, and 0.40 weight per cent) at three sea salt concentration levels in the air (zero, 1.50, and 15. 0 parts per million), and also any sulfur x sea salt interaction. The significance of test specimen metal losses and changes in tensile properties was established by analyses of variance, made at a confidence level of 95 per cent.
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Category :
Languages : en
Pages : 76
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Book Description
An experimental investigation was conducted to determine whether the maximum sulfur content of 0.4 weight per cent, currently allowed in grade JP-5 aviation turbine fuel, is a safe level for the protection of turbine blade alloys used in high performance engines. Specimens of two nickel-base alloys (Inconel 713C and Sierra Metal 200) were exposed to vitiated air from the Phillips 2-inch combustor (56 air-fuel ratio) at high temperature (2,000 degrees Fahrenheit), high pressure (15 atmospheres), and high velocity (500 feet per second) during a five-hour cyclic test (55 minutes fuel-on and 5 minutes fuel- off). A statistically designed test program was used to evaluate the effect of three sulfur concentration levels in the fuel (0.0002, 0.040, and 0.40 weight per cent) at three sea salt concentration levels in the air (zero, 1.50, and 15. 0 parts per million), and also any sulfur x sea salt interaction. The significance of test specimen metal losses and changes in tensile properties was established by analyses of variance, made at a confidence level of 95 per cent.
Author: H. T. Quigg
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ISBN:
Category :
Languages : en
Pages : 173
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An experimental investigation was conducted to determine whether the maximum sulfur content of 0.40 weight per cent, currently allowed in grade JP-5 aviation turbine fuel, is a safe level for the protection of turbine blade alloys used in high-performance engines. Four nickel-base alloys (Udimet 500, Inco 713C, IN-100 and SM-200), one cobalt-base alloy (WI-52 and one aluminum-diffusion coated alloy (Misco MDC-1 on Inco 713C) were exposed to vitiated air in Phillips hot corrosion test rig at high pressure (15 atmospheres) and high velocity (565 to 805 ft/sec) during a five hour cyclic test. A statistically designed program was used to evaluate the effect of temperature (1400, 1600, 1800, 2000 and 2200 F), fuel sulfur (0.0002, 0.040 and 0.40 weight per cent) and sea salt in air (zero, 1.0 and 10.0 ppm). The significance of metal weight loss by test specimens was determined by analysis of variance, made at a confidence level of 95 per cent. The validity of metal weight loss data was established by metallographic examination of test specimens, which showed a correlation with depth of penetration and the absence of deep intercrystalline attack.
Author: H. T. Quigg
Publisher:
ISBN:
Category :
Languages : en
Pages : 96
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Specimens of a nickel-base alloy (Inconel 713C) and the alloy with an aluminum-diffusion coating (Misco MDC-1) or with an aluminum-chromium-diffusion coating (Misco MDC-9) were tested using a high-pressure combustor facility to simulate environment in the turbine section of an aircraft engine. Tests were conducted at 2000 F gas temperature, without sea salt and with 1.0 ppm sea salt in air, using three levels of sulfur in fuel (0.40, 0.040 and
Author:
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Category : Aeronautics
Languages : en
Pages : 388
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Category : Science
Languages : en
Pages : 186
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Author:
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ISBN:
Category : Science
Languages : en
Pages : 188
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Author: United States. National Aeronautics and Space Administration Scientific and Technical Information Division
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Category : Corrosion and anti-corrosives
Languages : en
Pages : 172
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Author: Robert M. Schirmer
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Category :
Languages : en
Pages : 33
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The report discusses an investigation to determine whether the present limit of 0.4 per cent by weight (4,000 ppm) of sulfur in JP-5 fuel is a safe level for the protection of turbine-blade materials from hot corrosion in high-performance engines when operated in a marine environment. The present study shows that a 100-fold reduction in the sulfur limit to 40 ppm would not reduce hot corrosion significantly. Such reductions in the sulfur limit would drastically curtail fuel availability, since they approach the mean and the minimum of current production, and could cause critical problems in logistics. It was found that the use of an essentially sulfur-free fuel, containing only 4 ppm sulfur, significantly decreased both the surface scale on specimens and the weight lost by specimens of a wide variety of superalloys and superalloy-coating systems when exposed under conditions which simulate those in an aircraft-turbine engine ingesting air with 1 ppm sea salt. Thus, indications are that the sulfur in fuel must be below a 'threshold' concentration to improve the durability of turbine-blade materials. (Author).
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ISBN:
Category : Corrosion and anti-corrosives
Languages : en
Pages : 508
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Author: United States. National Aeronautics and Space Administration. Scientific and Technical Information Division
Publisher:
ISBN:
Category :
Languages : en
Pages : 756
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