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Wednesday, April 29, 2020 | History

2 edition of Laser-initiated combustion studies on metallic alloys in pressurized oxygen found in the catalog.

Laser-initiated combustion studies on metallic alloys in pressurized oxygen

J. W. Bransford

Laser-initiated combustion studies on metallic alloys in pressurized oxygen

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  • 26 Currently reading

Published by U.S. Dept. of Commerce, National Bureau of Standards, Order from National Technical Information Service (NTIS)] in [Washington, D.C.], [Springfield, VA .
Written in English

    Subjects:
  • Alloys -- Analysis,
  • Combustion

  • Edition Notes

    StatementJ.W. Bransford
    SeriesNBSIR -- 84-3013
    ContributionsUnited States. National Bureau of Standards
    The Physical Object
    Paginationvii, 56, 3, 6 p. :
    Number of Pages56
    ID Numbers
    Open LibraryOL17955527M

    @article{osti_, title = {Elevated-Temperature Tribology of Metallic Materials}, author = {Blau, Peter Julian}, abstractNote = {The wear of metals and alloys takes place in many forms, and the type of wear that dominates in each instance is influenced by the mechanics of contact, material properties, the interfacial temperature, and the surrounding environment. – bulk oxygen facilities (liquid or high pressure gas) at the customer’s site up to the point where gas enters the distribution systems; or – piping on specialized equipment File Size: KB. Leaner Lifted-Flame Combustion Enabled by the Use of an Oxygenated Fuel in an Optical CI Engine Leaner lifted-flame combustion (LLFC) is a mixing-controlled combustion strategy for compression-ignition (CI) engines that does not produce soot because the equivalence ratio at the lift-off length is less than or equal to approximately Cited by: 4. Carbon disulfide, CS 2, burns in oxygen. Complete combustion gives the balanced reaction that has been depicted here using molecular models. Calculate the grams of sulfur dioxide, SO 2, produced when a mixture of g of carbon disulfide and g of oxygen reacts.

    The F-1 is a gas generator-cycle rocket engine developed in the United States by Rocketdyne in the late s and used in the Saturn V rocket in the s and early s. Five F-1 engines were used in the S-IC first stage of each Saturn V, which served as the main launch vehicle of the Apollo F-1 remains the most powerful single combustion chamber liquid-propellant rocket engine Country of origin: United States.


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Laser-initiated combustion studies on metallic alloys in pressurized oxygen by J. W. Bransford Download PDF EPUB FB2

Get this from a library. Laser-initiated combustion studies on metallic alloys in pressurized oxygen. [J W Bransford; United States. National Bureau of Standards.].

We have observed explosions in stoichiometric methane-oxygen mixtures initiated by a pulse of 23 J from a C02 laser. SF6 is used as a resonant absorber to couple the laser energy into the otherwise nonabsorbing gas by: At room temperature, the reaction Metal + Oxygen = Metal oxide + Energy is spontaneous, to the right, for every metal element except gold.

For the metal elements that are used high strength alloys this spontaneity to the right continues for at least one oxide, and usually more, to. sudden ignition and combustion of metallic materials in contact with liquid and gaseous oxygen.

As these failures were analyzed it became apparent that data on the ignition and combustion characteristics of many materials was either limited or not available. To alleviate this problem, a program was initi-File Size: KB. Spontaneous ignition and combustion of sodium droplets in various oxidizing atmospheres at atmospheric pressure Symposium (International) on Combustion, Vol.

12, No. 1 Study of the reaction of magnesium vapor and oxygen at the surface of MgO deposits by atomic-absorption spectrophotometryCited by: A mild steel rod 10 mm in diameter and 50 mm in length was used for experiments.

The test pieces were heated in an argon atmosphere to prevent the oxidation reaction during the heating stage, and then ejected into the high-pressure oxygen by: 6. Study of Ti Alloy Combustion Susceptibility in Simulated Entry Environments.

AIAA SPACE Conference & Exposition. Prediction of Metal Fire Spread in High Pressure Oxygen. Combustion Science and TechnologyOnline publication date: 1-Jun Techniques for the study of the combustion of by: This combustion behavior has been observed before with Mg, Zn and Al rods using the pressurized oxygen index apparatus^^.

For Cu, its ignition temperature coincides with the melting temperature of the metal. Mechanism of Self-Ignition of Titanium Alloys in Oxygen. Abstract.

It is proposed that the ignitability of titanium alloys in oxygen, characterized by critical ignition pressure, is determined by critical temperature, i.e., the temperature to which juvenile surface fragments can be heated during metal by: With the advent of high energy CO, lasers, several investigators have noted laser-initiated combustion of titanium and its alloys.

Most of these studies have investigated the initial conditions and dependence of laser burnthrough times on such variables as beam size, Mach number, velocity, or specimen geometry. In order to explore the steady-state combustion of high-metal Al-Mg alloy hydro-reactive metal fuels for water ramjet engines, experiments were conducted to study the primary combustion and the secondary combustion of propellant with the Al-Mg alloy content 80%.

Oxygen bomb calorimeter was used to collect the solid products of primary combustion. LISTOFTABLES Page yoftheBulkBurningExperiments 15 laneousThermalDataonMetalsand Alloys 29 LISTOFFIGURES Figure1. TheCombustionChamber 6 File Size: 2MB.

Microgravity Science on the ISS. The Earth’s Surface • Weight felt because ground pushes against us May be possible to create metallic alloys with fibrous “Quiescent” combustion studies are virtually impossible to conduct without some element of. Integrated Computational and Experimental Studies of Complex Dendritic.

Microstructure Development during Directional Solidification of Metallic Alloys 38 Modeling Peritectic Microstructure Formation during Directional Solidification. in Space and on Earth 38 Isothermally Processed Alloys 38 Gravitational Effects in Distortion in Sintering Pressure is specified as inlet conditions for both the oxygen and methane inlet to achieve the proper mass flow development in time with changing combustion chamber pressure.

Methane and oxygen both have the temperature of T = K. The simulations have different cold flow sequences. The opening times of the run valvesFile Size: 7MB. Laser-initiated combustion studies on metallic alloys in pressurized oxygen book Intermetallic phases, as a group of materials which have a great practical importance, both in the past and in the present day, are subject of research on the basis of physicochemical and mechanical properties.

The presented studies were conducted for Fe40Al5CrTiB intermetallic alloy, their purpose was to determine the corrosion resistance of this alloy in an oxidizing environment, at Cited by: 1. In Part I of this program, Al-Li alloys T3 and T81 and Al alloy (tempers T, T37) were tested for compatibility with liquid oxygen using pressurized mechanical-impact apparatuses.

Hence, an attempt has been made to understand the influence of oxygen partial pressure on oxide composition and on the oxidation mechanisms of IN at °C. To achieve this, oxidation tests were performed at 3 different range of partial pressure: 10 −5, and mbar.

Tests were performed from 1 h to 28 days and the obtained oxide Cited by: Promoted ignition-combustion simulates the kindling-chain effect, which is the most common ignition mechanism for metals. The kindling-chain effect is the process by which a material with lower oxygen compatibility ignites and promotes the combustion of a more combustion-resistant material.

This paper discusses some of the current concepts of ignition and combustion of metals and presents combustion data on several metals. The materials examined were selected based on prior use in oxygen systems and anticipated combustion behavior. The observed combustion behavior is discussed in light of current theories about by: 3.

In this example, it is assumed that the oxygen pressure is high enough to form all possible oxide phases. In the very early stages of the oxidation process, rapid absorption of oxygen occurs by alloy, and NiO, Cr 2 O 3, and α‐Al 2 O 3 oxides form on the surface of the alloy equal to the spinel phases (in other words, NiCrAl 2 O 4 and NiAl 2 Author: Masoud Shourgeshty, Mahmood Aliofkhazraei, MehrdadMohammad Alipour.

Ionised oxygen is compressed using a strong EM field in a vacuum to produce ionised metallic oxygen, which remains stuck in place on the anode. Advantage: when the power is cut off, the oxygen reverts to gas and disperses.

The mechanism of structural transformation during combustion of nickel nitrate (oxidizer)–glycine (fuel) system is investigated by using different in situ techniques, including time-resolved X-ray diffraction (TRXRD), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) with dynamic mass spectrometry (MS), and high-speed infrared thermal imaging.

It is shown that for Cited by: Industrial Chemistry. Krishna Prakashan Media, Dissolved oxygen Biochemical oxygen demand BOD Chemical oxygen. Polypropylene Polystyrene Important points Polybutylene. of alloys Ferrous alloys Alloy steels or special steels Light alloys.3/5(10).

Reaction with Acids → Metal + Dilute acid → Metal salt + H 2 → H 2 doesn’t evolve in the case of HNO 3 as it is a strong oxidising agent. It oxidises H 2. → Cu does not react with acids like dilute H 2 SO 4 and dilute HCl. • Aqua regia → Freshly-prepared concentrated HCl and concentrated HNO 3 in ratio → It can dissolve even gold and platinum.

Respiration and combustion remove oxygen from the air. Respiration and combustion release carbon dioxide into the air. CARBON DIOXIDE IN THE AIR Figure Maintaining the levels of oxygen. The alloy was placed on a small platinum support which contained the diamond to be burned.

This apparatus, closed at each end by glass stoppers, cemented to the porcelain tube, permitted the ^combustion of the diamond in oxygen to be. Solid zinc sulfide is heated in an excess of oxyge.

Propanol is burned completely in air. Excess oxygen gas is mixed with ammonia gas in the presence of platinum. Gaseous silane, SiH₄, is burned in. Combustion Characteristics. Generally, the combustion reaction of a metal is a violent oxidation reaction between the metal and oxygen.

Figure 2 is an in suit picture during the combustion. The titanium alloy burns violently with a dazzling white light when the titanium alloy sample heated by a resistance wire reaches the ignition by: 2.

The engine's nozzle is in ( m) long with a diameter of inches ( m) at its throat and inches ( m) at its exit. The nozzle is a bell-shaped extension bolted to the main combustion chamber, referred to as a de Laval RS nozzle has an unusually large expansion ratio (about ) for the chamber pressure.

At sea level, a nozzle of this ratio would normally Associated L/V: Space Shuttle, Space Launch System. The oxygen pressure varies with the thickness of steel; the size of the electrode is about 4 bar for mild steel and low alloy steel plates mm thick; it is about bar for mm thick steel plates.

A.C. or D.C. supply of amps is required for cutting, piercing and gauging etc. (5) Arc-Air Cutting. Chemistry- Year 1 recall book.

two limitations in the practical procedure which would result in a less negative value for the enthalpy change of combustion of octane than the data book value [2] The strength of metals and metal alloys is due to their strong metallic bonding.

of oxygen toxicity, the maximum partial pressure of oxygen in clinical hyperbaric chambers is 3 ATA ( kPa). This value is more than 30% lower than the lowest oxygen partial pressure at which ignition of or burned spots on the titanium were observed in the study by Jackson et al.

(1). However, other alloys or differentCited by: 1. pronounced with oxygen being twice as effective as water and about five times more effective than carbon dioxide.

The observed effect of pressure and initial temperature is minimal. In the second part of the paper a two-dimensional unsteady state kinetic-diffusion-vaporization controlled numerical model for aluminum particle combustion is Cited by: The combustion process integrated by coal gasification and chemical-looping combustion (CLC) could be used in power plants with a low energy penalty for CO2 capture.

This work analyzes the main characteristics related to the CLC process necessary to use the syngas obtained in an integrated gasification combined cycle (IGCC) power plant. The kinetics of reduction with H2 and CO and. When air is used instead of pure oxygen, its partial pressure is approximately atm or 20% of the total air molecules.

The correction for this factor can be estimated using Nernst equation for the reduction of oxygen (equation ). The change in potential due to this dilution is log 10 (p oxygen) x /4 or V.

The maximum voltage. Plagens, Owen & Steinberg, Ted () Comparison of combustion products of bulk aluminum rods burning in high pressure oxygen in normal and reduced gravity. In Davis, S E & Steinberg, T A (Eds.) Flammability and sensitivity of materials in oxygen-enriched atmospheres: 14th Volume (ASTM International Selected Technical Papers, ).

ASTM International, United States of America, pp. Author: Owen Plagens, Theodore A. Steinberg. BY DIRECT COMBUSTION IN OXYGEN AT HIGH TEM- PERATURES By J. Cain, Associate Chemist, and H. Cleaves, Assistant Chemist The influence of temperature on the results obtained by the direct combustion of steel and iron in oxygen has been frequently investigated 2 and the general consensus of opinion seems to be.

Solid oxygen forms at normal atmospheric pressure at a temperature below K (− °C, − °F). Solid oxygen O 2, like liquid oxygen, is a clear substance with a light sky-blue color caused by absorption in the red part of the visible light spectrum.

Oxygen molecules have attracted attention because of the relationship between the molecular magnetization and crystal. 81 Microstructure observation of Al-Zn-Mg alloys with different Zn, Mg concentration 82 Neutron studies of geometrically frustrated layered manganese oxides 83 Effect of microalloying and thermo-mechanical processing on the properties of.

High Rate Diamond Deposition by Cooled Acetylene/ Oxygen Combustion Flame† SASO Katsumasa*, ANDO Yasutaka*, KOBAYASHI Akira** Abstract Since the combustion flame method using acetylene/oxygen is a high rate diamond synthesis process can be conducted in open air, this process is thought to be useful for low cost diamond production.Studies have found that the thickness of the adsorbed layer of water on a zinc surface increases with %RH and that corrosion rates increase with the thickness of the adsorbed layer.

There also seems to be a finite thickness to the water layer that, when exceeded, can limit the corrosion reaction due to limited oxygen diffusion.energy sources.

Chemical Looping Combustion (CLC) is a kind of oxy-combustion process involving indirect combustion of fuel with in situ oxygen separation and without any direct contact between air and fuel. The resulting flue gas is a ready to capture CO 2 stream diluted with .