| Résumé | The thrust developed by a fan is proportional, as a first approximation, to the total area of its blades. However,this simple relationship is modified by the mutual airflow interference between blades. Information concerning this effect would be helpful in designing for optimum blade chord and blade number. Tests were therefore carried out on the 12-inch tip-diameter fan rig in the Engine Laboratory, using a set of wide-chord blades designed as a 12-blade set, and running successively builds of 2, 3, 4, 6, 8, and 12 blades. These tests were repeated to cover three different stagger angles, and were in the range 260 - 810 ft/sec. tip speed (5000-15,500 rpm.) with disc loadings of from 32 lbs /ft²up to 300 lbs /ft² of gross disc area. |
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