Effects of Seal Geometry on Dynamic Impeller Fluid Forces and Moments

Yoshiki Yoshida; Yoshinobu Tsujimoto; Goh Morimoto; Hiroki Nishida; Shigeki Morii

doi:10.1115/1.1598988

Journal of Fluids Engineering | Volume 125 | Issue 5 | TECHNICAL PAPERS

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TECHNICAL PAPERS

Effects of Seal Geometry on Dynamic Impeller Fluid Forces and Moments

Yoshiki Yoshida, Associate Professor, Yoshinobu Tsujimoto, Professor, Goh Morimoto, Graduate Student, Hiroki Nishida, Undergraduate Student and Shigeki Morii, Deputy Manager

[+] Author and Article Information

Yoshiki Yoshida, Yoshinobu Tsujimoto, Goh Morimoto, Hiroki Nishida

Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan

Shigeki Morii

Mitsubishi Heavy Industries, Ltd., Yokohama R&D Center, 12 Nishikimachi, Nakaku, Yokohama, Kanagawa 231-8715, Japan

J. Fluids Eng 125(5), 786-795 (Oct 07, 2003) (10 pages) doi:10.1115/1.1598988 History: Received December 18, 2001; Revised April 09, 2003; Online October 07, 2003

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Figures

Scheme showing the fluid-induced forces F_r and F_t, and force moments. M_r and M_t (ε: eccentricity, Ω: shaft rotational speed, ω: whirling speed, “O”: impeller center on the whirl orbit, (r,t): radial and tangential to the whirl orbit)

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Pressure performance of the test impeller (ε=0,ω/Ω=0). Pressure coefficient ψ at the collector, ψ_s at the diffuser inlet, and pressure fluctuation ΔC_p1 at the diffuser inlet, versus flow coefficient ϕ (uncertainty in ψ, ψ_s±0.01, in ϕ±0.01).

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Spectral analyses of pressure fluctuations at the diffuser inlet P1 in case of Seal A, for ε=0 and ω/Ω=0 (uncertainty in ϕ±0.01)

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Dimensionless fluid force f_r (○) and f_t, (•) and fluid force moment m_r (○) and m_t (•) on the impeller with Seal A versus whirling speed ratio ω/Ω for various flow coefficients ϕ (ε=1.05 mm) (uncertainty in f_r,f_t±0.3,m_r,m_t±0.3, in ω/Ω±0.002, in ϕ±0.01)

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Dimensionless fluid force f_r (○) and f_t, (•) and fluid force moment m_r (○) and m_t (•) on the impeller with Seal B versus whirling speed ratio ω/Ω for various flow coefficients ϕ (ε=1.05 mm) (uncertainty in f_r,f_t±0.3,m_r,m_t±0.3, in ω/Ω±0.002, in ϕ±0.01)

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Dimensionless fluid force f_r (○) and f_t, (•) and fluid force moment m_r (○) and m_t (•) on the impeller with Seal C versus whirling speed ratio ω/Ω for various flow coefficients ϕ (ε=1.05 mm) (uncertainty in f_r,f_t±0.3,m_r,m_t±0.3, in ω/Ω±0.002, in ϕ±0.01)

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Spectral analyses of the pressure fluctuations at the diffuser inlet P1 and the signal of force sensor for various flow rates in Seal A (ε=1.05 mm) (uncertainty in ω/Ω±0.002, in ϕ±0.01)

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Comparison of the dimensionless fluid force f (○) due to the whirl with the dimensionless fluid force f_RS (×) due to the rotating stall for various flow rates, in Seal A (ε=1.05 mm) (uncertainty in f±0.3,f_RS±0.3, in ω/Ω±0.002, in ϕ±0.01)

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Unsteady pressure pattern in the vaneless diffuser due to the rotating stall coupled with the whirl at ω/Ω=0.26 for ϕ=0.100 in Seal A and B (ε=1.05 mm) (uncertainty in ω/Ω±0.002, in ϕ±0.01)

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Comparison of the dimensionless fluid force f_r and f_t (○) directly measured by the force sensor with the dimensionless pressure force f_rp and f_tp (×) estimated by the unsteady pressure at the impeller outlet, versus whirling speed ratio ω/Ω for ϕ=0.100, in Seal A, B, and C (ε=1.05 mm) (uncertainty in f_r,f_t±0.3,f_rp,f_tp±0.5, in ω/Ω±0.002, in ϕ±0.01).

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Yoshida Y, Tsujimoto Y, Morimoto G, Nishida H, Morii S. Effects of Seal Geometry on Dynamic Impeller Fluid Forces and Moments. ASME. J. Fluids Eng. 2003;125(5):786-795. doi:10.1115/1.1598988.

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Effects of Seal Geometry on Dynamic Impeller Fluid Forces and Moments

References

Figures

Mechanism to produce the impeller whirling motion

Cross section of the test facility (impeller, vaneless diffuser, and collector)

Configuration of test seals, Seal A, B, and C

Scheme showing the fluid-induced forces F_r and F_t, and force moments. M_r and M_t (ε: eccentricity, Ω: shaft rotational speed, ω: whirling speed, “O”: impeller center on the whirl orbit, (r,t): radial and tangential to the whirl orbit)

Pressure performance of the test impeller (ε=0,ω/Ω=0). Pressure coefficient ψ at the collector, ψ_s at the diffuser inlet, and pressure fluctuation ΔC_p1 at the diffuser inlet, versus flow coefficient ϕ (uncertainty in ψ, ψ_s±0.01, in ϕ±0.01).

Spectral analyses of pressure fluctuations at the diffuser inlet P1 in case of Seal A, for ε=0 and ω/Ω=0 (uncertainty in ϕ±0.01)

Dimensionless fluid force f_r (○) and f_t, (•) and fluid force moment m_r (○) and m_t (•) on the impeller with Seal A versus whirling speed ratio ω/Ω for various flow coefficients ϕ (ε=1.05 mm) (uncertainty in f_r,f_t±0.3,m_r,m_t±0.3, in ω/Ω±0.002, in ϕ±0.01)

Dimensionless fluid force f_r (○) and f_t, (•) and fluid force moment m_r (○) and m_t (•) on the impeller with Seal B versus whirling speed ratio ω/Ω for various flow coefficients ϕ (ε=1.05 mm) (uncertainty in f_r,f_t±0.3,m_r,m_t±0.3, in ω/Ω±0.002, in ϕ±0.01)

Dimensionless fluid force f_r (○) and f_t, (•) and fluid force moment m_r (○) and m_t (•) on the impeller with Seal C versus whirling speed ratio ω/Ω for various flow coefficients ϕ (ε=1.05 mm) (uncertainty in f_r,f_t±0.3,m_r,m_t±0.3, in ω/Ω±0.002, in ϕ±0.01)

Spectral analyses of the pressure fluctuations at the diffuser inlet P1 and the signal of force sensor for various flow rates in Seal A (ε=1.05 mm) (uncertainty in ω/Ω±0.002, in ϕ±0.01)

Comparison of the dimensionless fluid force f (○) due to the whirl with the dimensionless fluid force f_RS (×) due to the rotating stall for various flow rates, in Seal A (ε=1.05 mm) (uncertainty in f±0.3,f_RS±0.3, in ω/Ω±0.002, in ϕ±0.01)

Unsteady pressure pattern in the vaneless diffuser due to the rotating stall coupled with the whirl at ω/Ω=0.26 for ϕ=0.100 in Seal A and B (ε=1.05 mm) (uncertainty in ω/Ω±0.002, in ϕ±0.01)

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Effects of Seal Geometry on Dynamic Impeller Fluid Forces and Moments

References

Figures

Mechanism to produce the impeller whirling motion

Cross section of the test facility (impeller, vaneless diffuser, and collector)

Configuration of test seals, Seal A, B, and C

Scheme showing the fluid-induced forces Fr and Ft, and force moments. Mr and Mt (ε: eccentricity, Ω: shaft rotational speed, ω: whirling speed, “O”: impeller center on the whirl orbit, (r,t): radial and tangential to the whirl orbit)

Pressure performance of the test impeller (ε=0,ω/Ω=0). Pressure coefficient ψ at the collector, ψs at the diffuser inlet, and pressure fluctuation ΔCp1 at the diffuser inlet, versus flow coefficient ϕ (uncertainty in ψ, ψs±0.01, in ϕ±0.01).

Spectral analyses of pressure fluctuations at the diffuser inlet P1 in case of Seal A, for ε=0 and ω/Ω=0 (uncertainty in ϕ±0.01)

Dimensionless fluid force fr (○) and ft, (•) and fluid force moment mr (○) and mt (•) on the impeller with Seal A versus whirling speed ratio ω/Ω for various flow coefficients ϕ (ε=1.05 mm) (uncertainty in fr,ft±0.3,mr,mt±0.3, in ω/Ω±0.002, in ϕ±0.01)

Dimensionless fluid force fr (○) and ft, (•) and fluid force moment mr (○) and mt (•) on the impeller with Seal B versus whirling speed ratio ω/Ω for various flow coefficients ϕ (ε=1.05 mm) (uncertainty in fr,ft±0.3,mr,mt±0.3, in ω/Ω±0.002, in ϕ±0.01)

Dimensionless fluid force fr (○) and ft, (•) and fluid force moment mr (○) and mt (•) on the impeller with Seal C versus whirling speed ratio ω/Ω for various flow coefficients ϕ (ε=1.05 mm) (uncertainty in fr,ft±0.3,mr,mt±0.3, in ω/Ω±0.002, in ϕ±0.01)

Spectral analyses of the pressure fluctuations at the diffuser inlet P1 and the signal of force sensor for various flow rates in Seal A (ε=1.05 mm) (uncertainty in ω/Ω±0.002, in ϕ±0.01)

Comparison of the dimensionless fluid force f (○) due to the whirl with the dimensionless fluid force fRS (×) due to the rotating stall for various flow rates, in Seal A (ε=1.05 mm) (uncertainty in f±0.3,fRS±0.3, in ω/Ω±0.002, in ϕ±0.01)

Unsteady pressure pattern in the vaneless diffuser due to the rotating stall coupled with the whirl at ω/Ω=0.26 for ϕ=0.100 in Seal A and B (ε=1.05 mm) (uncertainty in ω/Ω±0.002, in ϕ±0.01)

Tables

Errata

Discussions

Related Content

Journals

Conference Proceedings

eBooks

Scheme showing the fluid-induced forces F_r and F_t, and force moments. M_r and M_t (ε: eccentricity, Ω: shaft rotational speed, ω: whirling speed, “O”: impeller center on the whirl orbit, (r,t): radial and tangential to the whirl orbit)

Pressure performance of the test impeller (ε=0,ω/Ω=0). Pressure coefficient ψ at the collector, ψ_s at the diffuser inlet, and pressure fluctuation ΔC_p1 at the diffuser inlet, versus flow coefficient ϕ (uncertainty in ψ, ψ_s±0.01, in ϕ±0.01).

Dimensionless fluid force f_r (○) and f_t, (•) and fluid force moment m_r (○) and m_t (•) on the impeller with Seal A versus whirling speed ratio ω/Ω for various flow coefficients ϕ (ε=1.05 mm) (uncertainty in f_r,f_t±0.3,m_r,m_t±0.3, in ω/Ω±0.002, in ϕ±0.01)

Dimensionless fluid force f_r (○) and f_t, (•) and fluid force moment m_r (○) and m_t (•) on the impeller with Seal B versus whirling speed ratio ω/Ω for various flow coefficients ϕ (ε=1.05 mm) (uncertainty in f_r,f_t±0.3,m_r,m_t±0.3, in ω/Ω±0.002, in ϕ±0.01)

Dimensionless fluid force f_r (○) and f_t, (•) and fluid force moment m_r (○) and m_t (•) on the impeller with Seal C versus whirling speed ratio ω/Ω for various flow coefficients ϕ (ε=1.05 mm) (uncertainty in f_r,f_t±0.3,m_r,m_t±0.3, in ω/Ω±0.002, in ϕ±0.01)

Comparison of the dimensionless fluid force f (○) due to the whirl with the dimensionless fluid force f_RS (×) due to the rotating stall for various flow rates, in Seal A (ε=1.05 mm) (uncertainty in f±0.3,f_RS±0.3, in ω/Ω±0.002, in ϕ±0.01)