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Thursday, May 7, 2020 | History

3 edition of Recent advances in capacitance type blade tip clearance measurements found in the catalog.

Recent advances in capacitance type blade tip clearance measurements

Recent advances in capacitance type blade tip clearance measurements

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

    Subjects:
  • Turbomachines.

  • Edition Notes

    StatementJohn P. Barranger.
    SeriesNASA technical memorandum -- 101291.
    ContributionsUnited States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15281230M

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Recent advances in capacitance type blade tip clearance measurements Download PDF EPUB FB2

Get this from a library. Recent advances in capacitance type blade tip clearance measurements. [John P Barranger; United States. National Aeronautics and Space Administration.]. John P. Barranger has written: 'Recent advances in capacitance type blade tip clearance measurements' -- subject(s): Turbomachines 'Two-dimensional surface strain measurement based on a variation.

American Institute of Aeronautics and Astronautics Sunrise Valley Drive, Suite Reston, VA Measurements of tip clearance and rotor vibrations at a transonic centrifugal compressor performed during operation at up to 50 rpm ( Hz) corresponding to kHz blade frequency and m.

Turbine tip clearance of aero-engine is important to engine performance. Proper tip clearance can reduce the gas leakage over turbine blade tips and improve the engine efficiency of turbo machinery and reduce the fuel consumption. Therefore, accurate tip clearance measurement is essential.

The inductive measurement method is one of the non-contact distance measurement methods, which has the Author: Zhenxia Liu, Ziyu Zhao, Yaguo Lyu, Lingqiang Zhao.

Request PDF | Improved model for the capacitance estimation of guarded capacitive sensors | We present a polynomial correction factor to improve the analytical models proposed in literature to. In-situ tip clearance measurements with laser doppler method were presented by Büttner et al.

[50,51]. Gil-García et al. and Zielinski et al. focused their work on time of arrival measurements on compressor and turbine blades, to determine blade by: 4.

This paper deals with a theoretical and experimental study about the motion measurement in ballscrews for avionic system.

The measurement system is based on a magnetic sensor optimized by a suitable finite element analysis. In particular the sensor performances are simulated for different configurations in order to maximize the sensitivity.

The efficiency and the reliability of the optimal Cited by: 5. Steiner, A. Techniques for blade tip clearance measurements with capacitive probes.

Meas. Sci. Technol.11, – [Google Scholar] [Green Version] Sarma, G.R.; Barranger, J.P. Capacitance-type blade-tip clearance measurement system using a dual amplifier with ramp/DC inputs and integration. IEEE Trans. by: 4. Recent Advances in Obstetrics and Gynaecology 22 Recent Advances in Obstetrics and Gynaecology 21 Edited by John Bonnar SECTION ONE: Obstetrics Cardiotocographic assessment of fetal well-being in late pregnancy and labour John A.

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The mixing interface is treated between rotor tip and the outer casing designated for mass, momentum and energy exchange. The interface treatment is meshed in unstructured hybrid element for the sake of accounting for the complex geometry around the blade tip region.

The prediction of fully three-dimensional, steady and unsteady flows was. Using, the value of C p is then given by 4a(1 – a) 2 and its maximum value for a = 1 3 is 16 27 = ≈ 60 %. This is sometimes called the Betz coefficient. It should be noted that occasionally the power coefficient of a wind turbine is used as the ratio of the actual power output to the ideal Betz value, i.e., W ˙ / (16 / 27 ρ A V ∞ 3) / 2, but this is not common practice.

FundamentalsNeed for Turbine Blade CoolingTurbine-Cooling TechnologyTurbine Heat Transfer and Cooling IssuesStructure of the BookReview Articles and Book Chapters on Turbine Cooling and Heat TransferNew Information from to ReferencesTurbine Heat TransferIntroductionTurbine-Stage Heat TransferCascade Vane Heat-Transfer ExperimentsCascade Blade Heat TransferAirfoil Endwall.

Capacitance per unit area (picofarads per square centi-meter per mil) Capacitance range (pico-farads) Tolerance: Pere en t as fired 20 Percent with 1 1 Not trimming applicable Temperature co- efficient of.

Blade tip clearances. These are measured using capacitance probes/traverse probes. The information gathered is very effective in monitoring the possible rubs between the blade tip and casing.

This information is also used by designers to optimize the Cited by: You can write a book review and share your experiences.

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