Converts the pressure energy of the motive fluid into high-velocity kinetic energy (
Download a trial of a fixed ejector calculation template (PDF preview available) and input your operating conditions. Verify that the entrainment ratio matches your existing ejector performance curve. If it does, you have found your permanent design tool.
The spreadsheet performs the following sequential calculations based on the HEI (Heat Exchange Institute) standards: Entrainment Ratio ( ejector design calculation xls fixed
In supersonic ejectors, "choking" can occur at the nozzle exit AND the mixing throat. A robust calculation sheet must check for Mach 1.0 at both locations. If the spreadsheet ignores choking at the secondary inlet, it will over-predict suction flow capacity.
The core mathematical workspace executing nozzle velocity, Mach number, throat sizing, and diffuser geometry formulas. Converts the pressure energy of the motive fluid
The most critical dimensionless number in ejector design is the Area Ratio ($AR$). $$ AR = \frac\textArea of Mixing Throat\textArea of Nozzle Exit $$ This ratio dictates the operating curve of the ejector.
Are you designing a or multi-stage vacuum system? leading to immediate performance loss.
Wet steam reduces the kinetic energy available at the nozzle, leading to immediate performance loss.