[논문]스러스트 래버린스 실을 배면에 갖는 원심형 임펠러의 축력 해석

박준혁; 김태호

doi:10.9725/kts.2021.37.1.31

[국내논문] 스러스트 래버린스 실을 배면에 갖는 원심형 임펠러의 축력 해석
Analysis of the Axial Thrust Force of a Centrifugal Impeller with a Thrust Labyrinth Seal at its Backside 원문보기

한국트라이볼로지학회지 = Tribology and lubricants, v.37 no.1, 2021년, pp.31 - 40

박준혁 (국민대학교 대학원 기계설계학과) , 김태호 (국민대학교 기계공학부)

Abstract ▼ AI-Helper

This study describes the effects of a thrust labyrinth seal applied to the backside of a centrifugal impeller on the axial thrust force for high speed turbomachinery. The bulk flow model using Neumann's equation calculates the seal cavity pressures and leakage flow rate of the thrust labyrinth seal based on three configurations: teeth-on-rotor (TOR), teeth-on-stator (TOS), and interlocking labyrinth seal (ILS). Prediction results show that the ILS is superior to the TOR and TOS in terms of leakage flow rate. A mathematical model of a centrifugal impeller with a thrust labyrinth seal on its backside calculates the force components corresponding to the impeller inlet, shroud, impeller backside outer, backside seal, and backside inner pressures. A summation of the force components renders the total axial thrust force acting on the centrifugal impeller. The Newton-Raphson numerical scheme iteratively calculates the pressures and leakage flow rate through the impeller wall gap. The prediction results reveal that the leakage flow rate and total axial thrust force increase with rotor speed, and the ILS significantly decreases the leakage flow rate, whereas it slightly increases the axial thrust force when compared to TOR and TOS. Increasing the seal clearance causes an increase in the leakage flow rate and a slight decrease in the axial thrust force with the ILS.

주제어

표/그림 (16)

그림 Fig. 1. Various configurations of thrust labyrinth seals to control secondary flow form centrifugal impeller.
그림 Fig. 2. Schematic view of thrust labyrinth seal.
표 Table 1. Geometries of thrust labyrinth seal and operating conditions
그림 Fig. 3. Predicted leakage flow rate versus seal clearance and number of teeth for TOS/TOR/ILS types of thrust labyrinth seal.
그림 Fig. 4. Grid systems of computational domain of thrust labyrinth seal (left) and predicted pressure contour (right).
그림 Fig. 5. Comparison of cavity pressure distribution calculated from BFM and CFD analyses for thrust interlocking labyrinth seal (ILS).
그림 Fig. 6. Schematic view of pressure forces acting axially on centrifugal impeller and direction of forces.
그림 Fig. 7. Flow chart for numerical solution procedure to calculate axial pressure force and leakage flow rate for centrifugal impeller with thrust labyrinth seal.
그림 Fig. 8. Pressure ratio and mass flow rate versus rotor speed, assumed for numerical analysis.
그림 Fig. 9. Predicted leakage flow rate at impeller backside wall gap versus rotor speed for ILS, TOS, and TOR type thrust labyrinth seals.
그림 Fig. 10. Predicted pressure distribution at impeller backside seal cavities versus rotor speed for ILS, TOS, TOR type thrust labyrinth seals. Rotor speed of 100 krpm.
그림 Fig. 11. Predicted thrust force components for impeller with ILS, TOS, and TOR type thrust labyrinth seals. Rotor speed of 100 krpm.
표 Table 2. Geometries of centrifugal impeller with thrust labyrinth seal and operating conditions
그림 Fig. 14. Predicted total thrust force versus seal clearance for increasing rotor speed. ILS type thrust labyrinth seals.
그림 Fig. 12. Predicted total thrust force versus rotor speed for impeller with ILS, TOS, and TOR type thrust labyrinth seals
그림 Fig. 13. Predicted leakage flow rate at impeller backside wall gap versus rotor speed for increasing seal clearance. ILS type thrust labyrinth seals.

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