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Tuesday, August 4, 2020 | History

3 edition of A comparison of analytical results for 20 K LOX/hydrogen instabilities found in the catalog.

A comparison of analytical results for 20 K LOX/hydrogen instabilities

A comparison of analytical results for 20 K LOX/hydrogen instabilities

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  • 8 Currently reading

Published by NASA, For sale by the National Technical Information Service in [Washington, D.C.], [Springfield, Va .
Written in English

    Subjects:
  • Liquid propellants -- Combustion -- Computer simulation.,
  • Liquid propellant rockets -- Computer simulation.,
  • Combustion stability.,
  • Computer programs.,
  • Fuel injection.,
  • Hydrogen oxygen engines.,
  • Rocket engines.

  • Edition Notes

    StatementMark D. Klem and Kevin J. Breisacher ; prepared for the 26th Joint Propulsion Conference cosponsored by the AIAA, SAE, ASME, and ASEE, Orlando, Florida, July 16-18, 1990.
    SeriesNASA technical memorandum -- 103166.
    ContributionsBreisacher, Kevin J., United States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination15 p.
    Number of Pages15
    ID Numbers
    Open LibraryOL16123553M

    Energy system. Hydrogen is a versatile energy carrier that can enable the renewable energy system. 57 What needs to be done. A call to action. 64 Building the hydrogen economy would require annual investments of about $20 to 25 billion for a total of about $ billion until Weight of Liquid or Gas: Volume of Liquid at Normal Boiling Point: Volume of Gas at 70°F (21°C) and 1 atm: lb: kg: L: gal: cf: m 3:

    This Backup Report was revised December, Introduction. The procedure for collection and analysis of air samples for hydrogen sulfide (H 2 S) is described in OSHA Method No. ID ().Briefly, H 2 S is collected on Whatman No. 4 filter paper (Special Order, Whatman Labsales, Hillsboro, OR) which has been impregnated with silver nitrate (AgNO 3).The H 2 S reacts with . For example, a 1% reduction in hydrogen purity creates a 12% increase in windage loss. A decrease in purity from 99% to 92% can reduce generator output by as much as kW. Obviously, this reduction in generator efficiency results in higher fuel costs and replacement power requirements.

    Fluid instabilities, particularly interfacial instabilities, have proven to be a powerful mechanism in driving and sustaining combustion processes in several devices of practical interest. Modern combustors are in fact designed to exploit the mixing and combustion characteristics associated with a broad class of canonical, interfacial instabilities. However, for hydrogen to be in a fully liquid state without boiling at atmospheric pressure, it needs to be cooled to K (− °F; − °C). One common method of obtaining liquid hydrogen involves a compressor resembling a jet engine in both appearance and principle.


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A comparison of analytical results for 20 K LOX/hydrogen instabilities Download PDF EPUB FB2

A comparison of analytical results for 20 K LOX/hydrogen instabilities. 20K LOX/HYDROGEN INSTABILITIES. Mark D. Klem I and Kevin J. Brelsacher I. NASA Lewis Research Center.

Cleveland. Get this from a library. A comparison of analytical results for 20 K LOX/hydrogen instabilities. [Mark D Klem; Kevin J Breisacher; United. A CO_ARISON OF ANALYTICAL RESULTS FOR 20K LOX/HYDROGEN INSTABILITIES Mark D. Klem I and Kevin J. Brelsacher I NASA Lewis Research Center Cleveland, Ohio OO u_ u_.

Abstract Test data from NASA Lewis' "Effect of Thrust Per Element on Combustion Stability Characteristics of Hydrogen-Oxygen Rocket Engines" test program are used to validate two. A comparison of analytical results for 20 K LOX/hydrogen instabilities Test data from NASA Lewis' Effect of Thrust Per Element on Combustion Stability Characteristics of Hydrogen-Oxygen Rocket Engines test program are used to validate two recently released stability analysis tools.

HICCIP is a recently developed combustion stability Author: Mark D. Klem and Kevin J. Breisacher. A comparison of analytical results for 20 K LOX/hydrogen instabilities Test data from NASA Lewis' Effect of Thrust Per Element on Combustion Stability Characteristics of Hydrogen-Oxygen Rocket Engines test program are used to validate two recently released stability analysis tools.

developed combustion stability analysis model. Using a Author: Mark D. Klem and Kevin J. Breisacher. “ A Comparison of Analytical Results for 20 K LOX/Hydrogen Instabilities,” AIAA/SAE/ASME/ASEE 26th Joint Propulsion Conference, AIAA PaperLink Google Scholar [75] Bendat J.

and Piersol A. G., Engineering Applications of Correlation and Spectral Analysis, Wiley, New York,pp.

50– "A Study of Injection Processes for Liquid Oxygen and Gaseous Hydrogen in a Pound-Thrust Rocket En-gine",NASA RM Ea, Jan. 8tAerodynamic Effects on Primary and Secondary Spray. In 40K methane/LOX 5 KHz engine tests, (first transverse mode) combustion instabilities observed by Rocketdyne are analyzed using Heidmann and Wieber's vaporization model to include LOX flow.

While the LOX post related 10 kHz instability was observed with hydrogen injection temperatures of around 95 K only, the new type of instability has been detected with hydrogen temperatures around both 45 K and 95 K but in the latter case with shorter injection elements.

The pressure field is very dynamic during unstable combustion. The test shown in Figure 19 was performed using a hydrogen injection temperature (T H) around 90 K. Low T H is historically known to have a strong impact on the stability of LOx.

20) Since then, LOX-post coupling has been identified in more and more cases from single-element experiments using LOX/H 2 26, 27) and LOX/CH4, 22) as well as multi-element sub-scale chambers, Hydrogen's flammability range (between 4% and 75% in air) is very wide compared to other fuels, as shown in Figure 3.

Under the optimal combustion condition (a 29% hydrogen-to-air volume ratio), the energy required to initiate hydrogen combustion is much lower than that required for other common fuels (e.g., a small spark will ignite it), as shown in Figure 4.

Since the late s, low hydrogen injection temperature is known to have a destabilising effect on rocket engines with the propellant combination hydrogen/oxygen. Self-excited combustion instabilities of the first tangential mode have been found recently in a research rocket combustor operated with the propellant combination hydrogen/oxygen with a hydrogen temperature of 95 K.

Bengt Sundén, in Hydrogen, Batteries and Fuel Cells, Cryogenic storage. Cryogenic storage increases the volumetric density by liquefying H 2 but still liquid or cryogenic hydrogen occupies three times more volume than gasoline for the same energy content.

If it is stored at 1 atm, it must be maintained below its boiling point (20 K). Reaching the required temperature is. In particular, the comparison of optical imaging and CFD results presents a unique set of challenges.

Quantitative comparison and assessment methods are currently being developed to facilitate rigorous validation of models. Summary. A brief overview of the research activities of the Combustion Dynamics group at DLR Lampoldshausen was presented.

One of the most efficient mixtures, oxygen and hydrogen, suffers from the extremely low temperatures required for storing liquid hydrogen (around 20 K or − °C or − °F) and very low fuel density (70 kg/m 3 or lb/cu ft, compared to RP-1 at kg/m 3 or 51 lb/cu ft), necessitating large tanks that must also be lightweight and.

Hydrogen - Density and Specific Weight Online calculator, figures and tables showing density and specific weight of hydrogen, H 2, at temperatures ranging from to °C ( to °F) at atmospheric and higher pressure - Imperial and SI Units. Compared with other fossil fuels, natural gas is a cost-effective feed for making hydrogen, in part because it is widely available, is easy to handle, and has a high hydrogen-to-carbon ratio, which minimizes the formation of by-product carbon dioxide (CO 2).However, as pointed out elsewhere in this report, natural gas is imported into the United States today, and imports are projected to.

All of the samples were immediately analyzed. The analytical results were %, % and % of theoretical for hydrogen sulfide demonstrating that sulfur dioxide is a positive interference and that the sodium carbonate filter eliminates the potential interference.

Freezing and boiling points. When heating at kPa a frozen crude-oil sample (from below K), solid-liquid equilibrium may existin the range K to K, and liquid vapour above K; - vapours start to decompose at about K. Viscosity=5⋅⋅ m2/s at 20 ºC. Exponential temperature variation fit.

The concentration of hydrogen (c H 2) can be then estimated by the following equation: (28) c H 2 = ρ H 2 H Korsten and Hoffman reported the following correlation to calculate the solubility of hydrogen in the HDT product: (29) λ = a 0 + a 1 T + a 2 T ρ + a 3 T 2 + a 4 1 ρ 2 where a 0 = −; a 1 = − × 10 −3; a 2 = 3.Pipeline Delivery of Hydrogen 20 Onsite Generation of Hydrogen 22 7.

Transfer of Hydrogen 22 8. Summary of Results 26 The Limits of a Pure Hydrogen Economy 28 A Liquid Hydrocarbon Economy 29 Liquid Hydrocarbons 31 9 Conclusion Analytical Interfe rences Caused by Residual Peroxide About USP Technologies USP Technologies is a leading provider of hydrogen peroxide and peroxide based, performance-driven, full-service environmental treatment programs to help purify water, wastewater, soil .