The ratio of the mixing chamber diameter to the nozzle diameter typically ranges between for optimal performance. Nozzle Position ( cap L sub g a p end-sub
For compressible fluids: [ A_t = \fracW_motiveP_1 \cdot \sqrt\frac\gammaR_gas T_1 \cdot \left(\frac2\gamma+1\right)^\frac\gamma+1\gamma-1 ] (Implemented as Excel formula with named constants) ejector design calculation xls
Calculate the critical pressure ratio: [ \fracP_cP_0 = \left( \frac2k+1 \right)^\frackk-1 ] If the backpressure at the nozzle exit is ≤ Pc, the flow is choked (sonic at the throat). Most high-efficiency ejectors are designed for choked flow in the motive nozzle. The ratio of the mixing chamber diameter to
The zone where momentum transfer occurs between the motive and suction fluids, often resulting in a normal shock wave that increases static pressure. The zone where momentum transfer occurs between the
Ejector design calculation XLS is a spreadsheet template used to calculate the design parameters of an ejector. It is a Microsoft Excel-based tool that simplifies the calculation process, making it easier for engineers to design and optimize ejectors. The XLS template typically includes formulas and equations for calculating various design parameters, such as nozzle diameter, mixing chamber diameter, and diffuser diameter.
While an Excel sheet utilizing ideal gas laws provides an excellent preliminary sizing tool (within accuracy), real-world ejector design faces non-idealities: