Movable ramp inlet for water jet propelled ships
First Claim
1. An adjustable inlet flow channel for a water jet propulsion system of a ship mounted in the baseline shell of a ship and to avoid cavitation comprising:
- a stationary lip in the aft portion of the inlet substantially flush with the baseline shell for diverting water into the inlet; and
a movable, flexible ramp forming the top of the inlet faired to the baseline shell at the forward end of the inlet and to a pump means inlet channel for adjusting the area of the inlet.
13 Assignments
0 Petitions
Accused Products
Abstract
A movable ramp, forming part of the inlet flow channel of a water jet prosion system, is adjustable to provide variable inlet area for various speed and propulsion requirements. In this flush or semi-flush type inlet, the lower lip is stationary and an upper ramp, forming an extension of the base-line shell, directs the flow into the inlet. If the baseline shell is not suited to the inlet installation, (for example, if a high deadrise angle exists) a forebody fairing is provided to make the baseline shell geometry suitable. The ramp is flexible, has a smooth surface, and is backed up by bell cranks and pusher bars that can move the ramp position to change the inlet area. The ramp position or inlet area may be adjusted manually or automatically to meet the requirements of speed and propulsion. If the centerline of the lip leading edge radius falls below the normal baseline (semi-flush inlet) suitably shaped "sideplates" are provided to avoid inlet cavitation or ventilation at yawed conditions. A "pressure alleviation" system may be provided to reduce the static pressure differential across the ramp to alleviate the structural design loading and reduce the total force required of an actuator to move the ramp.
27 Citations
8 Claims
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1. An adjustable inlet flow channel for a water jet propulsion system of a ship mounted in the baseline shell of a ship and to avoid cavitation comprising:
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a stationary lip in the aft portion of the inlet substantially flush with the baseline shell for diverting water into the inlet; and a movable, flexible ramp forming the top of the inlet faired to the baseline shell at the forward end of the inlet and to a pump means inlet channel for adjusting the area of the inlet. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification