Ejectors and jet pumps: Computer program for design and performance for compressible gas flow

language:English
■publisher
Publication Date:19921201
Publication Date:Dec 1, 1992
Publication Year:1992
■Description
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.
Document Type Technical Report
Document Number 19930008767
Subject Category Spelled-out MECHANICAL ENGINEERING
Report Number ESDU-92042
Total Page 45p
NASA Major Index Term - Controlled COMPRESSIBLE FLOW
COMPUTER AIDED DESIGN
COMPUTER PROGRAMS
EJECTORS
GAS FLOW
JET PUMPS
NOZZLE DESIGN
NASA Minor Index Term - Controlled ANNULAR NOZZLES
DESIGN ANALYSIS
DUCTS
FLOW EQUATIONS
FORTRAN
MASS FLOW RATE
NOZZLE GEOMETRY
Format Hardcopy
Record Type NASA STI
■Full Text
Total Page:45p

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