Numerical Analysis on the Effect of J-groove on Flows in Narrow Gaps between Rotating Disk and Casing

During operation and working of turbo machines, axial thrust balancing is important. To control and balance the axial thrust, a very simple method using shallow radial grooves mounted on the casing wall, called “J-groove”, was proposed, and studied experimentally[1]. This paper presents a numerical...

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Bibliographic Details
Published inInternational journal of fluid machinery and systems Vol. 15; no. 1; pp. 64 - 74
Main Authors Nguyen, VoDao, Matsui, Jun
Format Journal Article
LanguageEnglish
Published Tokyo Japan Science and Technology Agency 2022
Subjects
Grooves
Numerical analysis
Pressure loss
Rotating disks
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Summary:During operation and working of turbo machines, axial thrust balancing is important. To control and balance the axial thrust, a very simple method using shallow radial grooves mounted on the casing wall, called “J-groove”, was proposed, and studied experimentally[1]. This paper presents a numerical study of the effect of J-groove on the flow in the narrow gap along enclosed rotating disks based on open-source CFD software. It is seen that the difference in pressure between the hub and shroud tip is increased with the increasing number, depth, and length of J-groove. But in the case of increasing width of J-groove, the pressure loss along the radius decreases when the ratio of the groove width to the outer radius W is less than 0.2 and increases when W greater than 0.2.
ISSN:1882-9554
1882-9554
DOI:10.5293/IJFMS.2022.15.1.064