Decelerates the mixed stream, converting kinetic energy back into static pressure (discharge pressure).
Ensure the constants (A-J in) are appropriate for your specific motive/suction fluid combination.
This is the core engine where areas and velocities are calculated using the formulas from Section 2. Calculate sonic velocity (
Here is the typical iterative calculation sequence your spreadsheet should automate: ejector design calculation xls fixed
While Excel remains a staple, the industry is moving toward Computational Fluid Dynamics (CFD). However, the "fixed XLS" remains the first line of defense—a quick, reliable way to size equipment before committing to expensive simulations. It represents the bridge between 19th-century physics and 21st-century digital convenience.
The mixed stream enters the diffuser, which features a diverging cross-sectional area. As the area increases, the velocity decreases, converting kinetic energy back into static pressure. This raises the discharge pressure above the suction pressure, allowing the mixture to exhaust into a condenser or the atmosphere. 2. Key Design Parameters and Inputs
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By following these recommendations, engineers can design and optimize ejectors for a wide range of applications using the ejector design calculation XLS fixed.
For gas ejectors, treating air or steam as an incompressible fluid (like water) results in massive errors. The density changes drastically across the nozzle. Ensure your formulas incorporate isentropic expansion relations: $$ T_2 = T_1 \left(\fracP_2P_1\right)^\frac\gamma-1\gamma $$ Decelerates the mixed stream, converting kinetic energy back
| | Value | Unit | | --- | --- | --- | | Suction pressure (P_s) | | Pa | | Motive fluid pressure (P_m) | | Pa | | Suction fluid mass flow rate (m_s) | | kg/s | | Motive fluid mass flow rate (m_m) | | kg/s |
Use conditional formatting to highlight if the Compression Ratio ( ) exceeds stable limits (typically 10:1 for single stage).