Table 1 Computational conditions of three different restrictors
Design variable | Orifice restrictor | Multiple restrictors | Porous restrictors |
|---|---|---|---|
Inlet pressure Pin/Pa | 5 | 5 × 105 | 5 × 105 |
Outlet pressure Pout/Pa | 0 | 0 | 0 |
Operating pressure Po/Pa | 1 × 105 | 1 × 105 | 1 × 105 |
Gas density ρ/(kg/m3) | 1.189 | 1.189 | 1.189 |
Dynamic viscosity μ/(Ns/m2) | 1.8 × 10−5 | 1.8 × 10−5 | 1.8 × 10−5 |
Bearing diameter D/mm | 50 | 50 | 50 |
Orifice diameter d/mm | 0.05−0.15 | 0.05−0.15 | − |
Groove width w g /mm | − | 0.20 | − |
Groove depth d g /mm | − | 0.10 | − |
Groove length l g /mm | − | 1.50 | − |
Viscous resistance coefficient d r /m−2 | − | − | 8 × 1013−1.6 × 1014 |
Inertia resistance coefficient c r /m−1 | − | − | 2.5 × 107 |
Porosity γ | − | − | 0.18 |