2D CFD analysis of servovalve main stage internal leakage

Paolo Tamburrano, Andrew Plummer, Phil Elliott, Will Morris, Sam Page, Elia Distaso, Riccardo Amirante, P de Palma

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This paper presents research aimed at understanding the effects of geometrical imperfections and tolerances upon the internal leakage occurring around null in the main stages of servovalves. Specifically, a two-dimensional (2D) computational fluid dynamic analysis was used to predict the direct leakage flow as a function of the overlap and clearance between the spool and bushing sleeve, as well as the roundness on the edges of the spool and bushing sleeve. Predictions of direct leakage flow against edge overlap, which have general validity, are provided in the paper for three selected values of the pressure drop. For different values of the pressure drop, analytical correlations can be applied using the data retrieved from these graphs. The analysis shows that the leakage flow is highly affected by the above-mentioned geometrical parameters. As expected, for given values of overlap and radial clearance, the greater the roundness of the edges caused by manufacturing processes or wear, the higher the leakage flow. For low leakage and hence low power loss requirement, the radii on the spool and bushing sleeve as well as the clearance must be maintained as low as possible. In addition, it is well-known that overlap between the spool and its bushing sleeve can help to reduce the leakage flow at null, and the effect of edge roundness on this reduction is now revealed.
Original languageEnglish
Title of host publicationASME/BATH 2019 Symposium on Fluid Power and Motion Control
PublisherASME
Number of pages12
ISBN (Print)9780791859339
DOIs
Publication statusE-pub ahead of print - 10 Dec 2019

Cite this

Tamburrano, P., Plummer, A., Elliott, P., Morris, W., Page, S., Distaso, E., ... de Palma, P. (2019). 2D CFD analysis of servovalve main stage internal leakage. In ASME/BATH 2019 Symposium on Fluid Power and Motion Control [FPMC2019-1705, V001T01A051] ASME. https://doi.org/10.1115/FPMC2019-1705

2D CFD analysis of servovalve main stage internal leakage. / Tamburrano, Paolo; Plummer, Andrew; Elliott, Phil; Morris, Will; Page, Sam; Distaso, Elia; Amirante, Riccardo; de Palma, P.

ASME/BATH 2019 Symposium on Fluid Power and Motion Control . ASME, 2019. FPMC2019-1705, V001T01A051.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Tamburrano, P, Plummer, A, Elliott, P, Morris, W, Page, S, Distaso, E, Amirante, R & de Palma, P 2019, 2D CFD analysis of servovalve main stage internal leakage. in ASME/BATH 2019 Symposium on Fluid Power and Motion Control ., FPMC2019-1705, V001T01A051, ASME. https://doi.org/10.1115/FPMC2019-1705
Tamburrano P, Plummer A, Elliott P, Morris W, Page S, Distaso E et al. 2D CFD analysis of servovalve main stage internal leakage. In ASME/BATH 2019 Symposium on Fluid Power and Motion Control . ASME. 2019. FPMC2019-1705, V001T01A051 https://doi.org/10.1115/FPMC2019-1705
Tamburrano, Paolo ; Plummer, Andrew ; Elliott, Phil ; Morris, Will ; Page, Sam ; Distaso, Elia ; Amirante, Riccardo ; de Palma, P. / 2D CFD analysis of servovalve main stage internal leakage. ASME/BATH 2019 Symposium on Fluid Power and Motion Control . ASME, 2019.
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abstract = "This paper presents research aimed at understanding the effects of geometrical imperfections and tolerances upon the internal leakage occurring around null in the main stages of servovalves. Specifically, a two-dimensional (2D) computational fluid dynamic analysis was used to predict the direct leakage flow as a function of the overlap and clearance between the spool and bushing sleeve, as well as the roundness on the edges of the spool and bushing sleeve. Predictions of direct leakage flow against edge overlap, which have general validity, are provided in the paper for three selected values of the pressure drop. For different values of the pressure drop, analytical correlations can be applied using the data retrieved from these graphs. The analysis shows that the leakage flow is highly affected by the above-mentioned geometrical parameters. As expected, for given values of overlap and radial clearance, the greater the roundness of the edges caused by manufacturing processes or wear, the higher the leakage flow. For low leakage and hence low power loss requirement, the radii on the spool and bushing sleeve as well as the clearance must be maintained as low as possible. In addition, it is well-known that overlap between the spool and its bushing sleeve can help to reduce the leakage flow at null, and the effect of edge roundness on this reduction is now revealed.",
author = "Paolo Tamburrano and Andrew Plummer and Phil Elliott and Will Morris and Sam Page and Elia Distaso and Riccardo Amirante and {de Palma}, P",
note = "This research has been supported by the European Commission under the Marie Curie Intra-European fellowship Programme. EC Grant Agreement n. 701336, H2020 MSCA Individual Fellowship: Development of a novel servovalve concept for aircraft (DNSVCFA). Start date: 01/09/2017, End date: 19/10/2019, Location of the project: University of Bath",
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N1 - This research has been supported by the European Commission under the Marie Curie Intra-European fellowship Programme. EC Grant Agreement n. 701336, H2020 MSCA Individual Fellowship: Development of a novel servovalve concept for aircraft (DNSVCFA). Start date: 01/09/2017, End date: 19/10/2019, Location of the project: University of Bath

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N2 - This paper presents research aimed at understanding the effects of geometrical imperfections and tolerances upon the internal leakage occurring around null in the main stages of servovalves. Specifically, a two-dimensional (2D) computational fluid dynamic analysis was used to predict the direct leakage flow as a function of the overlap and clearance between the spool and bushing sleeve, as well as the roundness on the edges of the spool and bushing sleeve. Predictions of direct leakage flow against edge overlap, which have general validity, are provided in the paper for three selected values of the pressure drop. For different values of the pressure drop, analytical correlations can be applied using the data retrieved from these graphs. The analysis shows that the leakage flow is highly affected by the above-mentioned geometrical parameters. As expected, for given values of overlap and radial clearance, the greater the roundness of the edges caused by manufacturing processes or wear, the higher the leakage flow. For low leakage and hence low power loss requirement, the radii on the spool and bushing sleeve as well as the clearance must be maintained as low as possible. In addition, it is well-known that overlap between the spool and its bushing sleeve can help to reduce the leakage flow at null, and the effect of edge roundness on this reduction is now revealed.

AB - This paper presents research aimed at understanding the effects of geometrical imperfections and tolerances upon the internal leakage occurring around null in the main stages of servovalves. Specifically, a two-dimensional (2D) computational fluid dynamic analysis was used to predict the direct leakage flow as a function of the overlap and clearance between the spool and bushing sleeve, as well as the roundness on the edges of the spool and bushing sleeve. Predictions of direct leakage flow against edge overlap, which have general validity, are provided in the paper for three selected values of the pressure drop. For different values of the pressure drop, analytical correlations can be applied using the data retrieved from these graphs. The analysis shows that the leakage flow is highly affected by the above-mentioned geometrical parameters. As expected, for given values of overlap and radial clearance, the greater the roundness of the edges caused by manufacturing processes or wear, the higher the leakage flow. For low leakage and hence low power loss requirement, the radii on the spool and bushing sleeve as well as the clearance must be maintained as low as possible. In addition, it is well-known that overlap between the spool and its bushing sleeve can help to reduce the leakage flow at null, and the effect of edge roundness on this reduction is now revealed.

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