A Study on Static and Dynamic Characteristics of Spiral-Grooved Seals.

Iwatsubo, Takuzo; Ishimaru, Hidetsugu; Uchida, Tetsuhiko

doi:10.1299/kikaic.65.1395

Cited by 12 publications

(20 citation statements)

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“…The friction factors l l , l g , l l , l g are determined by Hirs' turbulent lubrication equations developed in 1974. 32 The inlet and outlet pressure loss coefficients are calculated by the equations shown in Childs 1 and Iwatsubo et al 2 Thus, steady-flow velocities in the axial and circumferential directions u l0 , w l0 , u g0 , w g0 are obtained from the previous calculation results by translating coordinate system as…”

Section: Theoretical Analysis Modelingmentioning

confidence: 99%

Theoretical and experimental analysis for leakage rate and dynamic characteristics of herringbone-grooved liquid seals

Zhai

Wei

et al. 2015

Proceedings of the Institution of Mechanical Engineers, Part J:

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In this paper, a theoretical analysis method for leakage rate and dynamic characteristics of herringbone-grooved liquid seals is proposed. Steady-state velocities and leakage rate are figured out first with the inertia term of the fluid combined with mass conservation within the seals. Subsequently, the rotordynamic coefficients are solved based on the investigation of Iwatsubo and Childs. Laboratory tests were performed on a specially designed test rig. Detailed comparisons between the experimental results and theoretical predictions show a good agreement on the leakage rate and hydraulic forces for five model seals, which provide an evidence of validation of the analysis method developed in this paper. Moreover, the influence of rotational speed and pressure difference on the leakage rate and rotordynamic coefficients of herringbone-grooved seals is discussed. The results show that the operating conditions and seal structures greatly influence the sealing and rotordynamic performances, which is helpful for designing herringbone-grooved seals.

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Section: Theoretical Analysis Modelingmentioning

confidence: 99%

Theoretical and experimental analysis for leakage rate and dynamic characteristics of herringbone-grooved liquid seals

Zhai

Wei

et al. 2015

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…The first step of this study was the experimental investigation of the static and dynamic characteristics of SBGS [11]. Leakage and fluid forces were measured for 13 types of SBGS with circumferentially or helically grooved stator.…”

Section: Review Of Sbgs Testsmentioning

confidence: 99%

“…2 (b). Reference [11] presents the test method, and also the test results except for Seal No.0, 4, 5, and 6.…”

Section: Review Of Sbgs Testsmentioning

confidence: 99%

“…It was expected that SBGS has above merits of the grooved seals, and furthermore would improve the seal stability. In order to investigate the static and dynamic characteristics of SBGS, the leakage and the fluid forces of several kinds of SBGS were measured and compared with those of conventional grooved seals without swirl brakes in the grooves [11]. The test results showed different tendencies between the SBGS with circumferential grooves and the SBGS with helical grooves.…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Swirl Braked Grooved Seals on the Stability and the Unbalance Response of a Flexible Rotor

Ishimaru

Iwatsubo

2008

JSDD

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Swirl Braked Grooved Seal (SBGS) is an advanced grooved annular seal for rotordynamic stability improvement. SBGS has circumferential or helical grooves in which several swirl brakes are placed. The swirl brakes can prevent the circumferential flow that might generate unstable dynamic fluid force in the seal. The stability and the unbalance response of a simply supported Jeffcott rotor, having a seal near the disk, are analyzed by FEM in which measured rotordynamic coefficients of seals are used. The rotordynamic analysis is performed for 18 different types of seals, including 13 SBGS, 4 conventional grooved seals (1 circumferential and 3 helical), and a smooth seal. Results show that the SBGS with circumferential grooves have high stability and low sensitivity to unbalance. On the other hand, the swirl brakes did not improve either stability or unbalance response for the helically grooved seals.

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“…Fluid films have a major influence on the global behavior of shaft lines, since they add stiffness and damping and govern the stability of the system (Frêne et al, 1990;Iwatsubo et al, 1990). Leakage flows between wheel (flanges) and casing are also very important and govern stability (Childs, 1991).…”

mentioning

confidence: 99%

Global Dynamics of Shaft Lines Rotating in Surrounding Fluids Application to Thin Fluid Films

Lornage¹,

Jacquet‐Richardet²

2004

The International Journal of Rotating Machinery

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While often sufficiently accurate, approaches using rotor dynamics and bladed disc dynamics are not adapted to the study of certain important cases, i.e., when observing wheel/shaft coupling or when fluid elements are strongly coupled with local structural deformations. The approach proposed here is a step toward a global model of shaft lines. The whole flexible wheel/shaft assembly and the influence of specific fluid film elements are considered in a full threedimensional model. A modal projection associated with a grid located at the interface of the fluid and structural domains provides an efficient and adaptable coupling. The equations governing the whole system are solved within a time marching procedure which alternatively considers the equations of fluid and structure. The technique chosen is applied to two different test cases. The first is composed of a disc and a thin-walled shaft mounted on a hydrodynamic bearing. The second is intended for studying a more realistic structure composed of a shaft and a wheel coupled with a fluid film between the wheel and a casing. These applications make it possible to identify trends related to fluid effects and couplings between the flexible structural parts.High performances, reliability, and safety require a highly accurate prediction of turbomachine behavior. In this context, the work proposed aims at developing a global model of wheel/shaft assemblies rotating in surrounding fluids.Two uncoupled approaches are generally used to predict the dynamic behavior of rotating parts of machines.

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A Study on Static and Dynamic Characteristics of Spiral-Grooved Seals.

Cited by 12 publications

References 0 publications

Theoretical and experimental analysis for leakage rate and dynamic characteristics of herringbone-grooved liquid seals

Theoretical and experimental analysis for leakage rate and dynamic characteristics of herringbone-grooved liquid seals

The Effect of Swirl Braked Grooved Seals on the Stability and the Unbalance Response of a Flexible Rotor

Global Dynamics of Shaft Lines Rotating in Surrounding Fluids Application to Thin Fluid Films

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