RESEARCH ON ANNULAR NOZZLE TYPE GROUND EFFECT MACHINE OPERATING OVER WATER WATER SURFACE CONFIGURATION

摘要

A Ground Effect Machine operating over water is influenced by the manner in which the water surface is distorted under the GEM. A multiple wave gauge was designed to record the time history of the water surface. At various positions as the GEM passed overhead.nExperiments were made using two different angles of jet inclina¬tion (-20 and -60 degrees), at various-air flow rates, clearance heights and forward speeds. The shape of the cavity formed between the GEM and the water was found to be dependent on the forward velocity. The general shape was similar for the different jet inclination angles and the various flow rates and clearance heights used. The relative size of the cavity increased with increasing flow rate and decreasing height.nProfile and surface contours were drawn for the various runs.