Design and Test of a Fan Diffuser Bend System Suitable for a Ground Effect Machine 620340

A method of optimizing the performance of an integrated fan/duct system suitable for use in a ground effect machine (GEM) is formulated. A specific design is made utilizing this method to satisfy requirements of a GEM test bed for the David Taylor Model Basin. A method of axial-fan off-design performance prediction is also developed and applied to the test fan.
Test results indicate that the overall performance of the fan/duct system with a right angle turn is in reasonable agreement with the design value of 80%. The off-design fan performance is predicted satisfactorily.


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