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TECHNICAL PAPERS: Gas Turbines: Heat Transfer and Turbomachinery

Predicted Effects of Bearing Sump and Injection Pressures on Oil Labyrinth Leakage

[+] Author and Article Information
S.-Y. Park, D. L. Rhode

Mechanical Engineering Department, Texas A&M University, College Station, TX 77843

J. Eng. Gas Turbines Power 125(1), 316-325 (Dec 27, 2002) (10 pages) doi:10.1115/1.1520161 History: Received December 01, 2000; Revised March 01, 2001; Online December 27, 2002
Copyright © 2003 by ASME
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Figures

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Schematic diagram of the two types of labyrinth seals considered
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Comparison of the computed oxygen concentration with the results from Verma et al. 3
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Flowfield for the nonbuffer labyrinth seal
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Variation of nondimensional oil vapor mass flux parameter with bearing pressure ratio for nonbuffered labyrinth seals (see Table 3(b))
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Variation of the bearing mass flow ratio (rbearing=ṁoil/ṁoil|baseline) for Pbearing/Pprocess=2.1 for nonbuffered labyrinth seal cases (see Table 3(b))
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Flowfield for the buffer-gas labyrinth seal
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Variation with injection pressure of (a) oil vapor mass flux and (b) injection gas and bearing gas mass flux reaching the process gas side of the seal. [Pprocess=100 kPa (14.5 psi), Cr=0.25 mm (0.01 in), W=0.38 mm (0.015 in.), L=30.86 mm (1.215 in.), Rsh=100.13 mm (3.942 in.), rpm=18,000, Win=0.3Rshω=56.556 m/s].
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Variation with injection pressure of (a) oil vapor mass flux and (b) injection gas and bearing gas mass flux reaching the process gas side of the seal. [Pprocess=100 kPa (14.5 psi), Cr=0.36 mm (0.014 in.), W=0.38 mm (0.015 in.), L=30.86 mm (1.215 in.), Rsh=100.13 mm (3.942 in.), rpm=18,000, Win=0.3 Rshω=56.556 m/s].
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Variation with injection pressure of (a) oil vapor mass flux and (b) injection gas and bearing gas mass flux reaching the process gas side of the seal. [Pprocess=100 kPa (14.5 psi), Cr=0.25 mm (0.01 in.), W=0.38 mm (0.015 in.), L=15.62 mm (0.615 in.), Rsh=100.13 mm (3.942 in.), rpm=18,000, Win=0.3Rshω=56.556 m/s].
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Variation with injection pressure of (a) oil vapor mass flux and (b) injection gas and bearing gas mass flux reaching the process gas side of the seal. [Pprocess=100 kPa (14.5 psi), Cr=0.25 mm (0.01 in.), W=0.38 mm (0.015 in.), L=46.10 mm (1.815 in.), Rsh=100.13 mm (3.942 in.), rpm=18,000, Win=0.3Rshω=56.556 m/s].
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Variation with injection pressure of (a) oil vapor mass flux and (b) injection gas and bearing gas mass flux reaching the process gas side of the seal. [Pprocess=100 kPa (14.5 psi), Cr=0.25 mm (0.01 in.), W=0.38 mm (0.015 in.), L=30.86 mm (1.215 in.), Rsh=200.25 mm (7.884 in.), rpm=18,000, Win=0.3Rshω=113.24 m/s].
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Variation with injection pressure of (a) oil vapor mass flux and (b) injection gas and bearing gas mass flux reaching the process gas side of the seal. [Pprocess=100 kPa (14.5 psi), Cr=0.36 mm (0.014 in.), W=0.38 mm (0.015 in.), L=15.62 mm (0.615 in.), Rsh=100.13 mm (3.942 in.), rpm=18,000, Win=0.3Rshω=56.556 m/s].
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Variation with injection pressure of (a) oil vapor mass flux and (b) injection gas and bearing gas mass flux reaching the process gas side of the seal. [Pprocess=100 kPa (14.5 psi), Cr=0.36 mm (0.014 in.), W=0.51 mm (0.02 in.), L=30.86 mm (1.215 in.), Rsh=100.13 mm (3.942 in.), rpm=18,000, Win=0.3Rshω=56.556 m/s].
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Variation of the ratio of critical injection pressure ratio (PinjC/Pbearing) with bearing pressure ratio (Pbearing/Pprocess) for buffered labyrinth seal. (See Table 5(b)).
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Variation of the critical injection mass flow ratio (rm=ṁinjC/ṁinjC|baseline) and critical injection pressure ratio (rp=PinjC/PinjC|baseline) for Pbearing/Pprocess=2.1 for buffered labyrinth seal cases. (See Table 5(b)).

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