Simple orifice restrictor sizing
Cross-section area and diameter of a simple orifice restrictor for a gas bearing, from the required flow rate and supply/restrictor/ambient pressures.
Flow rate is at normal (ambient) pressure p_A. The restrictor pressure ratio p_R/p_S is clamped to the choked-flow limit (0.53) if entered lower — flow through the orifice cannot exceed sonic velocity. The legacy page also has a Viscosity, η field, but the source only feeds it into an intermediate value that is never used by either result — it has zero effect on the outcome, so it is not exposed as an input here.
Methode & referenties
- Gas properties (η, R, ρ, κ): Table 14.1, p. 415.
- Discharge coefficient C_d(d/l): eq. 14.2, p. 416.
De berekening is een letterlijke overzetting van de originele client-side JavaScript van /engineering-abc/calculators/d_orifice.htm. Resultaten zijn geverifieerd gelijk aan het origineel via een geautomatiseerde golden-master-test. Geen enkele formule is opnieuw afgeleid of “verbeterd”.