To create a robust ejector design calculation spreadsheet, your content should focus on a one-dimensional (1D) analytical model that captures the thermodynamic behavior of fluid mixing. While full empirical performance often requires proprietary manufacturer data, you can build a highly accurate screening tool by following these structural and technical components. 1. Primary Inputs (User Entry Data)
Key equation:
Calculate the nozzle throat area: [ A_t = \frac\dotm_1\rho_1 \cdot v_t ] where ( v_t ) is critical (sonic) velocity if the pressure ratio exceeds the critical pressure ratio. ejector design calculation xls
Ejectors are widely used in refrigeration, vacuum systems, chemical processing, and aerospace. Their advantages include no moving parts, simplicity, and the ability to handle corrosive or two-phase flows. However, design is challenging due to coupled shock waves, mixing layers, and compressible flow effects. To create a robust ejector design calculation spreadsheet
Entrainment ratio from momentum (constant-area mixing, no shock):
Implemented via iterative Goal Seek or explicit solve. Automate the design process for multiple operating points
EjectorPerformance(P_m, P_s, P_d, geometry) that returns R.Best for gas ejectors (e.g., steam jet vacuum systems). Assumes mixing occurs at constant pressure (ideal for supersonic motive flow).