Ejector Design | Calculation Xls

In Excel formula (for k=1.4, air): =SQRT((2/0.4)*((P_m/P_s)^(0.4/1.4)-1))

A simplified practical approach used in industry XLS templates: Use the by El-Dessouky (2002) for steam-jet ejectors: $$Er = 0.85 \times \left( \frac{P_m}{P_s} \right)^{0.77} \times \left( \frac{P_d}{P_s} \right)^{-1.13}$$ ejector design calculation xls

But wait – if $P_m/P_s$ exceeds the critical pressure ratio (approx 1.89 for air), Mach is >1. Most ejectors operate supersonically (M=1.5 to 4.0). Your XLS should cap Mach using the critical ratio. $$V_m = M_m \times \sqrt{k \cdot R \cdot T_m}$$ In Excel formula (for k=1

$$P_{discharge} = P_{throat} + \eta_d \cdot \frac{1}{2} \rho_m (V_2^2)$$ In Excel formula (for k=1.4