Modelling of non-laminar phenomena in high reliability hydrostatic seals operating in extreme conditions

Brunetière, Noël; Galenne, Erwan; Tournerie, Bernard; Pierre-Danos, Isabelle

doi:10.1016/j.triboint.2007.07.002

Cited by 11 publications

(9 citation statements)

References 12 publications

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“…The lubrication film of the hydrostatic mechanical seal for reactor main coolant pump is in laminar state [5,12] when the seal is under the normal operation conditons.…”

Section: B Thermo-elasto-hydrostatic Modelmentioning

confidence: 99%

Thermo-Elasto-Hydrostatic Effect Analysis of the Double Tapered Hydrostatic Mechanical Seals for Reactor Coolant Pumps under the Influence of Flow Regime

Liu

Peng

Meng

2012

2012 Asia-Pacific Power and Energy Engineering Conference

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Thermo-elastic deformation of a hydrostatic mechanical seal for reactor main coolant pumps plays an important role on seal performance due to the operation at high-pressure, high-speed and wide temperature range. A thermo-elasto-hydrostatic multi-phsics coupling model is established for a double tapered face seal with convergence gap by considering the variation of dynamic viscosity with fluid pressure and temperature, heat transfer between lubrication film and seal rings and the deformation of end face. FDM and FEM are used to solve the control equations. The effects of thermo-elastic deformation and the misalignment angle of seal rings on seal performance and the comparative analysis of flow regime under the different misalignment angles of the seal rings are studied. It is found that the double tapered hydrostatic mechanical seal has larger turbulence region and transition region than the single tapered hydrostatic mechanical seal. The misalignment of the seal ring can change the flow regime. The face temperature will be decreased because of the enhanced effect of heat convection under the turbulence regime; Seal medium pressure has great influence on the seal performance and the speed of the rotor change the film stiffness apparently.

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“…The lubrication film of the hydrostatic mechanical seal for reactor main coolant pump is in laminar state [5,12] when the seal is under the normal operation conditons.…”

Section: B Thermo-elasto-hydrostatic Modelmentioning

confidence: 99%

Thermo-Elasto-Hydrostatic Effect Analysis of the Double Tapered Hydrostatic Mechanical Seals for Reactor Coolant Pumps under the Influence of Flow Regime

Liu

Peng

Meng

2012

2012 Asia-Pacific Power and Energy Engineering Conference

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“…As the key parts of important equipment, the non-contact mechanical seal is widely used in aerospace, energy, petrochemical and other fields, such as the petrochemical pump, turbine pump etc. [1][2][3][4]. Under the extreme working conditions, due to the axial vibration or shock, the mechanical face seals often occur transient deformation or destruction of the sealed surface, which will lead to the seal failure [2,5,6].…”

Section: Introductionmentioning

confidence: 99%

“…Such as Zhang Guoyuan carried out the sealing static performances [1], the non-contacting mechanical seal transient start-up separated speed [2] and the seal controllable [7]. Brunetiere N. studies steady-state hydrostatic model and thermal effect of the mechanical face seals [4,8]. The studies on the nonlinear vibration response of the mechanical seal are few.…”

Section: Introductionmentioning

confidence: 99%

Study on the nonlinear transient response for the non-contact mechanical face seal

Chen¹,

Zhang²,

Zhao³

et al. 2017

J. vibroeng.

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Considering the tilt of the seal ring, the transient vibration response analysis model of the non-contact mechanical seal is presented. The model is consisted of the transient Reynolds equation, the equation of motion and the equation for solving the high order nonlinear dynamic coefficients of seal. The relative error of the high order nonlinear film force to the linear film force is also obtained. With Euler method, the characteristic parameters of the transient vibration response are obtained, which include the axial vibration displacements and the angle-swing of the static ring. The 14 nonlinear force and 14 nonlinear overturning moment dynamic coefficients for the non-contact mechanical seal are calculated. The results show that the influence of the damping effects of the sealed fluid between the seal gap on the axial vibration displacements and the angle-swing is linear. The film thickness distribution changes with the axial vibration of seal, which will lead to static ring swing, and the swing also can cause the axial vibration of the seal. With the increase of the nonlinear order, the relative error of the nonlinear film force decreases. All of the nonlinear film forces, the non-linear stiffness coefficient and damping coefficient decrease with the seal film thickness increases.

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“…Tournerie takes tracking research on the flow characteristics of hydrostatic seal face; the change of surface flow from laminar to turbulent is theoretically analyzed. Through an influence coefficient matrix that considers the effect of thermal deformation, it states that the film flow in laminar or near turbulent is related to the difference in inlet temperature [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Research on the cone angle and clearance of main pump seal

et al. 2015

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For better film characteristics of the main pump seal (MPS), a theoretical calculation model was proposed based on the Reynolds equation. A case study with defined MPS was carried out, film stiffness was taken as the basic constraint condition, and the cone angle and clearance are two optimization targets. When the film stiffness reaches a maximum, the corresponding cone angle and clearance is the optimal value. The results show that: (1) film stiffness increased and decreased with clearance and cone angle, respectively; (2) the optional clearance was determined to be within a range of 2~8 µm at a cone angle of between 0.1~1.2'; (3) the maximum of film stiffness is inversely proportional to the cone angle (Clearance) approximately under the clearance (Cone angle) is fixed; (4) leakage is directly proportional to the clearance to power three, and the clearance has greater influence on the amount of leakage than the cone angle. These results provide a reliable theoretical justification for MPS-based designs including optimization method. It therefore forms a fundamental base for research and practical application.

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Modelling of non-laminar phenomena in high reliability hydrostatic seals operating in extreme conditions

Cited by 11 publications

References 12 publications

Thermo-Elasto-Hydrostatic Effect Analysis of the Double Tapered Hydrostatic Mechanical Seals for Reactor Coolant Pumps under the Influence of Flow Regime

Thermo-Elasto-Hydrostatic Effect Analysis of the Double Tapered Hydrostatic Mechanical Seals for Reactor Coolant Pumps under the Influence of Flow Regime

Study on the nonlinear transient response for the non-contact mechanical face seal

Research on the cone angle and clearance of main pump seal

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