| Abstract | A computer program in Fortran IV has been developed for calculating pressure-massflow characteristics and operating points for an axially thin lifting fan subjected to crossflow conditions. The program computes the crossflow-induced inflow and efflux jet distortions and the fan through-flows given only readily accessible information about the fan, its speed and the crossflow velocity. The generality of the solution is restricted only by the fact that the fan performance model chosen is basically a mean line method, and the limited availability of blade row performance data, which are necessary to calculate fan performance.
A relatively simple solution to this difficult problem was made possible by treating the whole fan as a collection of individual fan segments of constant flow area, each operating under assumed steady flow conditions, and using appropriate segment-to-segment and fan-to-external-field matching criteria.
The computer program is simple in concept and very easy to use. There are no intermediate program stops, although the pertinent intermediate data are displayed. The program provides sufficient outputs to make a complete and detailed assessment of the lifting fan under representative operating conditions. It has been checked satisfactorily against a considerable number of measured experimental conditions. |
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