HsealH® Analysis of Annular Pressure Seals
COST: $3,500 (Executable + Excel GUI)

The hsealh program calculates the static and dynamic force performance of annular pressure seals, including textured surfaces such as HONEYCOMB, round-hole patterns, knurled, etc

1) seal leakage,
2) friction torque, power dissipation,
3) load capacity (fluid film forces and restoring moments),
4) 16 complex impedance force and moment coefficients due to dynamic journal center displacements and journal axis rotations. The real and imaginary parts of the impedances correspond to the stiffness and damping coefficients evaluated at a specified excitation frequency,
5) stability indicator or whirl frequency ratio for lateral journal motions and equivalent stiffness at threshold speed of instability.

for isothermal flow with barotropic fluid (liquid or gas) in the single phase flow regime as a function of
a) rotor (journal) center eccentricity and journal axis misalignment,
b) inlet specified circumferential pre-swirl velocity distribution.

and the following fluids:
(5) water, (6) oil, (7) gas, (12) barotropic liquid (properties a function of pressure solely)

Axial clearance functions included (a) uniform, b) tapered, c) stepped, or, d) arbitrary via spline interpolation.

Analysis: The motion of a thin film fluid described by mass and momentum transport equations (with fluid inertia effects) with an inertia entrance pressure drop (Lomakin bearing) at the seal inlet.

Flow model: Fully Developed Laminar, Transition regime, and/or Turbulent Bulk-Flow Model

Governing Equations: Continuity, Circumferential and Axial Bulk-Flow Momentum Equations with inlet inertial pressure losses.

Turbulence Closure Model: Bulk-Flow with friction parameters based on Moody's friction factor equations for roughened surface conditions.

Numerical method of solution: Control volume - finite difference (SIMPLEC) method.

Limitations and Restrictions: Isothermal flows.

Input- MS Excel® interface - worksheet

Output - Excel® interface - worksheet

Language: FORTRAN77 Source code NOT provided.

Users: 20+ OEMs and end users of turbomachinery