Development and Model Tests of a Surface Ship Additive System
A Froude scaled ship model 11.4 feet long and 1.4 feet girth was tested for drag while dilute polymer (FRA) water solutions were ejected around the hull. A ram scoop-slot ejective arrangement in conjunction with a polymer mixing and feed system was developed and utilized successfully to affect the m...
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| creator | Gollan,A Tulin,M. P Rudy,S. L |
| description | A Froude scaled ship model 11.4 feet long and 1.4 feet girth was tested for drag while dilute polymer (FRA) water solutions were ejected around the hull. A ram scoop-slot ejective arrangement in conjunction with a polymer mixing and feed system was developed and utilized successfully to affect the model's drag. Four series of tests were conducted at various operating conditions including three ejection slot gap settings and two ejective slot locations. An actual drag reduction of about 12 percent of the total drag at top speed (20 ft/sec), was obtained. Drag reduction of over 18 percent of the total drag or more than 55 percent in the frictional drag is conceivable at proper ejection conditions with two ejection stations. This may be obtained when the ejected flow amounts only to about ten times the sublayer flow rate and contains a polymer concentration between 1000 and 1300 ppm. Additional studies are recommended to enable the optimization of the polymer ejective system and assess its full potential. (Author) |
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L ; HYDRONAUTICS INC LAUREL MD</creatorcontrib><description>A Froude scaled ship model 11.4 feet long and 1.4 feet girth was tested for drag while dilute polymer (FRA) water solutions were ejected around the hull. A ram scoop-slot ejective arrangement in conjunction with a polymer mixing and feed system was developed and utilized successfully to affect the model's drag. Four series of tests were conducted at various operating conditions including three ejection slot gap settings and two ejective slot locations. An actual drag reduction of about 12 percent of the total drag at top speed (20 ft/sec), was obtained. Drag reduction of over 18 percent of the total drag or more than 55 percent in the frictional drag is conceivable at proper ejection conditions with two ejection stations. This may be obtained when the ejected flow amounts only to about ten times the sublayer flow rate and contains a polymer concentration between 1000 and 1300 ppm. Additional studies are recommended to enable the optimization of the polymer ejective system and assess its full potential. (Author)</description><language>eng</language><subject>ADDITIVES ; DRAG ; DRAG REDUCING FLUIDS ; EJECTION ; Fluid Mechanics ; LUBRICANTS ; Marine Engineering ; MODEL TESTS ; POLYMERS ; REDUCTION ; SHIP HULLS ; SHIP MODELS ; SKIN FRICTION ; SOLUTIONS(MIXTURES)</subject><creationdate>1970</creationdate><rights>APPROVED FOR PUBLIC RELEASE</rights><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>230,780,885,27567,27568</link.rule.ids><linktorsrc>$$Uhttps://apps.dtic.mil/sti/citations/AD0718389$$EView_record_in_DTIC$$FView_record_in_$$GDTIC$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>Gollan,A</creatorcontrib><creatorcontrib>Tulin,M. 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This may be obtained when the ejected flow amounts only to about ten times the sublayer flow rate and contains a polymer concentration between 1000 and 1300 ppm. Additional studies are recommended to enable the optimization of the polymer ejective system and assess its full potential. (Author)</description><subject>ADDITIVES</subject><subject>DRAG</subject><subject>DRAG REDUCING FLUIDS</subject><subject>EJECTION</subject><subject>Fluid Mechanics</subject><subject>LUBRICANTS</subject><subject>Marine Engineering</subject><subject>MODEL TESTS</subject><subject>POLYMERS</subject><subject>REDUCTION</subject><subject>SHIP HULLS</subject><subject>SHIP MODELS</subject><subject>SKIN FRICTION</subject><subject>SOLUTIONS(MIXTURES)</subject><fulltext>true</fulltext><rsrctype>report</rsrctype><creationdate>1970</creationdate><recordtype>report</recordtype><sourceid>1RU</sourceid><recordid>eNrjZLB1SS1LzckvyE3NK1FIzEtR8M1PSc1RCEktLilWyE9TSFQILi1KS0xOVQjOyCxQcExJySzJLAPyKotLUnN5GFjTEnOKU3mhNDeDjJtriLOHbkpJZnJ8cUlmXmpJvKOLgbmhhbGFpTEBaQDfWCxi</recordid><startdate>197011</startdate><enddate>197011</enddate><creator>Gollan,A</creator><creator>Tulin,M. P</creator><creator>Rudy,S. 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L</creatorcontrib><creatorcontrib>HYDRONAUTICS INC LAUREL MD</creatorcontrib><collection>DTIC Technical Reports</collection><collection>DTIC STINET</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Gollan,A</au><au>Tulin,M. P</au><au>Rudy,S. L</au><aucorp>HYDRONAUTICS INC LAUREL MD</aucorp><format>book</format><genre>unknown</genre><ristype>RPRT</ristype><btitle>Development and Model Tests of a Surface Ship Additive System</btitle><date>1970-11</date><risdate>1970</risdate><abstract>A Froude scaled ship model 11.4 feet long and 1.4 feet girth was tested for drag while dilute polymer (FRA) water solutions were ejected around the hull. A ram scoop-slot ejective arrangement in conjunction with a polymer mixing and feed system was developed and utilized successfully to affect the model's drag. Four series of tests were conducted at various operating conditions including three ejection slot gap settings and two ejective slot locations. An actual drag reduction of about 12 percent of the total drag at top speed (20 ft/sec), was obtained. Drag reduction of over 18 percent of the total drag or more than 55 percent in the frictional drag is conceivable at proper ejection conditions with two ejection stations. This may be obtained when the ejected flow amounts only to about ten times the sublayer flow rate and contains a polymer concentration between 1000 and 1300 ppm. Additional studies are recommended to enable the optimization of the polymer ejective system and assess its full potential. (Author)</abstract><oa>free_for_read</oa></addata></record> |
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| language | eng |
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| source | DTIC Technical Reports |
| subjects | ADDITIVES DRAG DRAG REDUCING FLUIDS EJECTION Fluid Mechanics LUBRICANTS Marine Engineering MODEL TESTS POLYMERS REDUCTION SHIP HULLS SHIP MODELS SKIN FRICTION SOLUTIONS(MIXTURES) |
| title | Development and Model Tests of a Surface Ship Additive System |
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