The Application of Gas-Lubricated Bearings to a Miniature Helium Expansion Turbine

Birmingham, B. W.; Sixsmith, H.; Wilson, W. A.

doi:10.1007/978-1-4757-0531-7_4

Cited by 10 publications

(2 citation statements)

References 2 publications

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“…The nozzle is designed for a particular type of impulse turbine which is used in the liquefaction process of cryogenic fluids [18]. The impact of fluid is tangential to the turbine blade due to the airfoil design of nozzle which is shown in Fig.…”

Section: Mathematical Modelmentioning

confidence: 99%

Design and Numerical Investigation to Predict the Flow Pattern of Non-axisymmetric Convergent Nozzle: A Component of Turboexpander

Kumar¹,

Panda²,

Biswal³

et al. 2019

JTTE

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Current work proposes a novel design methodology using curve-fitting approach for a non-axisymmetric airfoil convergent nozzle used in small-sized cryogenic turboexpander. The curves used for designing the nozzle are based on a combination of fifth and third order curve at upper and lower surface respectively. Four different turbulence model such as k-ε, SST, BSL and SSG Reynolds stress turbulence model is used to visualize and compare the fluid flow characteristics and thermal behaviors at various cross-sections. It is interesting to observe that the Mach number obtained at the outlet of the nozzle is highest and temperature drop is maximum for SSG model under similar boundary conditions. It is also observed that the designed nozzle with curve fitting approach is appropriate for impulse type turbine with a small amount of reaction. The key feature of this implementation is to obtain subsonic velocity at the nozzle exit and reduce the irreversible losses through the nozzle, which can affect the performance of a turboexpander.

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Section: Mathematical Modelmentioning

confidence: 99%

Design and Numerical Investigation to Predict the Flow Pattern of Non-axisymmetric Convergent Nozzle: A Component of Turboexpander

Kumar¹,

Panda²,

Biswal³

et al. 2019

JTTE

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show abstract

“…The following components of the energy dissipation were recorded (adiabatic efficiency, h ad ¼ 82 %): A significant contribution to cryogenic expander technolgy was the development of highspeed, gas-lubricated bearings [61], [62], which enabled the successful construction of miniature refrigerators using rotor diameters as small as 8 mm operating at a speed up to 500 000 rpm. The following loss components have been reported for a radial flow expansion turbine (adiabatic efficiency, h ad ¼ 84.0 %) [60] The compressor efficiency does not influence the liquid yield in a liquefier or the refrigeration effect in a cryocooler; however, the expander efficiency has a significant effect on both quantities.…”

Section: Expandersmentioning

confidence: 99%

Cryogenic Technology

Barron

2000

Ullmann's Encyclopedia of Industrial Chemistry

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The article contains sections titled: 1. Introduction 2. Uses 3. Liquefaction Systems 3.1. Joule ‐ Thomson Effect 3.2. Basic Linde ‐ Hampson System 3.3. Precooled Linde ‐ Hampson System 3.4. Linde Dual‐Pressure System 3.5. Claude Liquefier 3.6. Liquefaction Systems for Natural Gas 3.7. Collins Helium‐Liquefaction System 3.8. Miniature Liquefaction Systems 3.9. Comparison of Liquefaction Systems 4. Cryogenic Refrigeration Systems 4.1. Thermodynamically Ideal Refrigerator 4.2. Joule ‐ Thomson Refrigerators 4.3. CVI Cold‐Gas Refrigerator 4.4. Stirling Refrigerator 4.5. Vuilleumier Refrigerator 4.6. Solvay Refrigerator 4.7. Gifford ‐ McMahon Refrigerator 4.8. Magnetic Refrigerators 4.9. Dilution Refrigerator 5. Components of Liquefiers and Cryocoolers 5.1. Cryogenic Heat Exchangers 5.1.1. Types of Cryogenic Heat Exchangers 5.1.2. Heat Exchangers for Dilution Refrigerators 5.1.3. Heat Exchanger Design Problems 5.1.4. Regenerators 5.2. Compressors 5.3. Expanders 6. Low‐Temperature Separation Systems 6.1. Minimum Work of Separation 6.2. Properties of Mixtures 6.3. Flash Calculation 6.4. Principles of Cryogenic Rectification 6.5. Linde Single‐Column System 6.6. Linde Double‐Column System 6.7. Heylandt System 6.8. Argon Separation 6.9. Neon Separation 6.10. Physical Adsorption

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Cryogenic Technology

Windmeier

Barron

2013

Ullmann's Encyclopedia of Industrial Chemistry

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The Application of Gas-Lubricated Bearings to a Miniature Helium Expansion Turbine

Cited by 10 publications

References 2 publications

Design and Numerical Investigation to Predict the Flow Pattern of Non-axisymmetric Convergent Nozzle: A Component of Turboexpander

Design and Numerical Investigation to Predict the Flow Pattern of Non-axisymmetric Convergent Nozzle: A Component of Turboexpander

Cryogenic Technology

Cryogenic Technology

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