COMPUTER PREDICTION OF INJECTOR CHARACTERISTICS.

A COMPREHENSIVE COMPUTER METHOD FOR THE DESIGN OF WATER INJECTORS IS WORKED OUT ALLOWING TO FEED DESIGN VALUES INTO THE COMPUTER AND TO OBTAIN CHARACTERISTIC CURVES FOR NONCAVITATING FLOW CONDITIONS.THE CRUCIAL EXPERIMENTALLY DETERMINED COEFFICIENT IS THE DIFFUSER EFFICIENCY WHICH INCLUDES ALL LOSS TERMS.THE MAIN ADVANTAGE OF THE METHOD LIES IN THE ANALOG PRINTOUT ALLOWING TO SURVEY VISUALLY THE TOTAL PERFORMANCE BEHAVIOUR FOR GIVEN DESIGN CONDITIONS USING ONLY ONE LUMPED EXPERIMENTAL COEFFICIENT.THE OBTAINED CURVES, EXPRESSED IN PARAMETERS USED IN EXPERIMENTAL INVESTIGATIONS, COMPARE WELL WITH EXPERIMENTAL DATA FOR THE SAME DIFFUSER EFFICIENCY REPORTED IN LITERATURE.NUMERICAL EXAMPLES ARE GIVEN TO ILLUSTRATE THE USE OF THE FORTRAN PROGRAMME FOR THE DESIGN OF INJECTORS.THE METHOD USED IN CONJUNCTION WITH EXPERIMENTS FACILITATES CORRELATION, INTERPOLATION, EXTRAPOLATION OF TEST DATA OF JET PUMPS, AND CAN BE A VALUABLE TOOL IN DESIGN.(A).