For further study, consider these resources:
What you are using (Steam, Air, Water, or Gas)? Whether the flow is subsonic or choked/sonic ?
Unlike variable-orifice ejectors that use a moving needle to adjust flow, a has a set nozzle diameter and throat area.
: $$A_d = \frac\dotm_d R T_dP_d V_d$$ (Note: $T_d$ rises slightly due to compression). ejector design calculation xls fixed
If you prefer a pre-built sheet, look for these files:
: Typically, the mixing area is sized based on a Mach number of ~1.0 (sonic flow at the throat). A rule of thumb for "Fixed" design: $$A_mix \approx A_t \times \left( 1 + \fracP_m - P_sP_s \right)^0.5$$ Or use the simplified velocity method: Velocity of Motive ($V_m$) and Suction ($V_s$) mix to create Velocity ($V_d$). $$V_d = \frac\dotm_m V_m + \dotm_s V_s\dotm_d$$
Excel shows “Circular Reference” warning or the entrainment ratio doesn’t converge. Cause: Ejector design requires solving for mixed flow conditions iteratively. Fix: For further study, consider these resources: What you
Spreadsheet works for air but gives nonsense for steam or heavy hydrocarbons. Fix:
= Dt * 4.5
No need to look up enthalpies manually.
The section where the high-velocity primary fluid and lower-velocity secondary fluid mix. Throat Section:
Create a table that shows how the suction vacuum changes if the motive steam pressure drops by 10%. 5. Common Pitfalls in Fixed Ejector Design
If your spreadsheet results seem "off," check for these common pitfalls: Inaccurate Pmotivecap P sub m o t i v e end-sub : $$A_d = \frac\dotm_d R T_dP_d V_d$$ (Note:
The phrase "ejector design calculation xls fixed" might look like a string of technical search terms, but it represents the intersection of classical fluid dynamics and the modern digital quest for precision. At its heart, an ejector is a deceptively simple device: it uses a high-pressure motive fluid to entrain and compress a lower-pressure suction fluid, all without a single moving part. The Elegance of the Ejector
): Typically . Accounts for momentum transfer losses when streams collide. Diffuser Efficiency ( ηdeta sub d