Create a distinct input block (usually shaded light blue). This prevents accidental overwriting of formulas.
The diffuser converts velocity back to pressure. The fixed spreadsheet calculates recovery efficiency (η_diff) using a locked empirical model: η_diff = 0.8 - 0.002 * (Diffuser half-angle in degrees) Most broken spreadsheets ignore the half-angle limit; a fixed version prevents angles >15 degrees.
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If the Excel model indicates a Mach number of less than 1.0 at the nozzle exit, the motive steam pressure is too low to achieve supersonic flow. The spreadsheet should be programmed with conditional formatting ( IF statements) to flag "Subsonic Flow Error" if Pmcap P sub m drops below the critical pressure threshold. The "Break" Point
For a fixed-geometry ejector calculation, the physical dimensions are constant. The sheet evaluates performance based on these specific constraints: E4 ( Nozzle Exit Diameter ( ): E5 ( Mixing Throat Diameter ( ): E6 ( Tab 3: Calculation Engine (Step-by-Step Formulas) Step 1: Convert Units to SI Convert pressures from Pascalcap P a s c a l ): =B4*100000 Convert temperatures to Kelvincap K e l v i n ): =B5+273.15 Convert mass flows to : =B12/3600 Step 2: Determine Motive Flow Capacity Because the geometry is fixed (
Ejector calculations are highly sensitive to gas properties. Create a distinct input block (usually shaded light blue)
The spreadsheet should automate the following steps using standard fluid mechanics (often based on the Heenan and Gilbert isentropic expansion Expansion Ratio ( Compression Ratio ( Entrainment Ratio ( This is the "heart" of the calculation. Text for XLS:
This article provides a comprehensive guide to understanding, calculating, and optimizing steam jet ejector designs using Excel spreadsheets.
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Critical pressure ratios to verify if the flow is sonic/choked.
An ejector uses a high-pressure motive fluid to entrain and compress a low-pressure suction fluid. The geometry of a fixed-ejector is divided into three critical zones: