Research on Annular Nozzle Type Ground Effect Machine Operating over Water; Preliminary Study of Air Flow Patterns. Appendix: Dimensional Analysis

摘要

The annular nozzle ground effect machine model was mounted rigidly on a carriage with its base plate horizontal. Air was supplied by an air compressor driven by a variable speed DC motor. The air flow rates were measured with a calibrated 2 inch orifice in the inlet pipe to the blower. The carriage was run at forward speeds varying between 0 and 3.5 knots. The height above the water level (before the blower was turned on) was set at 1/2 in., 1 in., or 1-1/2 in. Air flow rates between 7 and 15 lbs/min (0.115 and 0.256 lbs/sec) were used.