To develop a "fixed" version of an Ejector Design Calculation XLS
Mixing Section Area ($A_mix$): 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 ($V_d$). $$V_d = \frac\dotm_m V_m + \dotm_s V_s\dotm_d$$ ejector design calculation xls fixed
If your spreadsheet results seem "off," check for these common pitfalls: Inaccurate Pmotivecap P sub m o t i v e end-sub To develop a "fixed" version of an Ejector
Add a stage selector:
Use =IF(compression_ratio < 10, "Single stage", IF(compression_ratio < 60, "Two stage", "Three stage")) ejector design calculation xls fixed
"Calculate the mass of suction fluid handled per unit mass of motive fluid." Formula logic: Nozzle Throat Diameter ( cap D sub t