| 摘要 |
An inlet adapter for a personal watercraft jet propulsion system is hydrodynamically designed to achieve optimum performance at both low and high watercraft speeds. The inlet adapter provides an inlet opening having a fixed geometry. A plurality of tines extend from the inlet adapter rearward to cover an inlet opening through which water is pumped to a jet propulsion system. The aft portion of each tine has an exposed face that is blunt, preferably flat. The blunt face restricts water flow through the inlet opening at relatively high speeds, thereby improving high speed performance. The tines are also designed to facilitate laminar flow as the flow of water passes the tines en route to the jet propulsion system. In another aspect, the invention provides a hydrodynamic bulge downstream of the downstream edge of the inlet opening. The hydrodynamic bulge draws sea water accumulating in front of the downstream edge of the inlet opening downward when the watercraft is moving at relatively high speeds, thus reducing drag on the watercraft.
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