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Abstract

An experimental investigation of the flow within a generic flush type water-jet inlet has
been carried out to identify the principal flow features and provide a basis for development
of computational fluid dynamics (CFD) models. Tests were performed in a
cavitation tunnel with the model inlet fitted to the test section ceiling, and effects of
thickening the ingested tunnel wall boundary layer were investigated. The model was
fitted with a range of instrumentation to investigate the ramp pressure distribution and
boundary layer development, lip incidence, and pump face flow properties. Observations
of lip and duct cavitation inception and behavior were also made. The results
showed the inlet performance to be generally improved with the ingestion of a thicker
boundary layer. The thickened boundary layer significantly reduced ramp boundary
layer separation and distortion of flow at the notional pump face. However, a greater
range of lip incidence occurred with the thickened boundary layer with consequent
greater likelihood of lip separation and cavitation occurrence. Ideal lip incidence and
pump face flow uniformity occurred at flow parameters significantly different from
those for ideal pump face pressure recovery. Large developed cavities on the inlet lip
were observed for a range of conditions typical of conventional high-speed vessel
operation.

Item Type:	Article
Authors/Creators:	Brandner, PA and Walker, GJ
Journal or Publication Title:	Journal of Ship Research
Item Statistics:	View statistics for this item

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