Ejectors and jet pumps: Computer program for design and performance for compressible gas flow
Publication Date：Dec 1, 1992
ESDU 92042 introduces a FORTRAN program (available as ESDUpac A9242) for the design or performance assessment of ejectors (or jet pumps) in which the primary and secondary flows are of the same gas. It uses the methods of ESDU 84029 which provides two approaches to design. The quick design method is based on an analysis of experimental data for single-nozzle designs and, given a minimum of input (selection of entry and required exit pressures, temperatures, mass flow rate and dimensions), will calculate primary nozzle and exit dimensions. The detailed design method, based on one-dimensional flow equations that are detailed, applies also to multi- and annular-nozzle designs. In addition to the input for the quick method, it requires loss factors (in the primary and secondary nozzles, mixing duct and contraction or diffuser) and acceptable maximum design values for four parameters, but will calculate flow conditions throughout the ejector. The performance assessment method for an existing design, also based on the one-dimensional flow equations, calculates conditions throughout the ejector and at exit given the geometry, loss factors and a range of entry conditions. The use of the three methods is illustrated in a worked example. The program is provided as source code with file input/output or compiled within a user-friendly shell that prompts for data, both on disc for PC DOS systems.
|Subject Category Spelled-out
|NASA Major Index Term - Controlled
COMPUTER AIDED DESIGN
|NASA Minor Index Term - Controlled
MASS FLOW RATE