哈尔滨工程大学学报
哈爾濱工程大學學報
합이빈공정대학학보
JOURNAL OF HARBIN ENGINEERING UNIVERSITY
2015年
1期
68-72
,共5页
肥大型船%气层减阻%气流量%航速%排水量%槽深%相对减阻率%绝对减阻率
肥大型船%氣層減阻%氣流量%航速%排水量%槽深%相對減阻率%絕對減阻率
비대형선%기층감조%기류량%항속%배수량%조심%상대감조솔%절대감조솔
full-formed ship%air lubrication%air flow rate%navigational velocity%displacement%hollow depth%rela-tive resistance reduction rate%absolute resistance reduction rate
为探讨气层减阻技术在大型低速运输船舶上的实施方法，在拖曳水池里开展了95000DWT散货船1︰38模型喷气减阻试验，研究了气流量、航速、排水量、凹槽深度对喷气减阻效果的影响规律。试验结果表明：在95000DWT散货船模型底部设置凹槽并喷气，模型总阻力大幅度降低。随着气流量增加，阻力降低幅度增大，存在一个饱和气流量：当Fr＝0．139～0．182时，随航速增加，减阻率呈降低趋势；凹槽深度增加，喷气减阻效果提高，但不喷气时凹槽会导致阻力增加，且阻力增加幅度随凹槽深度增加而增加，存在一个最佳凹槽深度（ h／B＝0．024）；压载排水量减阻率高于设计排水量减阻率。凹槽深度20 mm，设计航速下，饱和喷气（Cq＝0．210）时，设计排水量下绝对减阻率可达26．99％，压载排水量下绝对减阻率可达33．79％。
為探討氣層減阻技術在大型低速運輸船舶上的實施方法，在拖抴水池裏開展瞭95000DWT散貨船1︰38模型噴氣減阻試驗，研究瞭氣流量、航速、排水量、凹槽深度對噴氣減阻效果的影響規律。試驗結果錶明：在95000DWT散貨船模型底部設置凹槽併噴氣，模型總阻力大幅度降低。隨著氣流量增加，阻力降低幅度增大，存在一箇飽和氣流量：噹Fr＝0．139～0．182時，隨航速增加，減阻率呈降低趨勢；凹槽深度增加，噴氣減阻效果提高，但不噴氣時凹槽會導緻阻力增加，且阻力增加幅度隨凹槽深度增加而增加，存在一箇最佳凹槽深度（ h／B＝0．024）；壓載排水量減阻率高于設計排水量減阻率。凹槽深度20 mm，設計航速下，飽和噴氣（Cq＝0．210）時，設計排水量下絕對減阻率可達26．99％，壓載排水量下絕對減阻率可達33．79％。
위탐토기층감조기술재대형저속운수선박상적실시방법，재타예수지리개전료95000DWT산화선1︰38모형분기감조시험，연구료기류량、항속、배수량、요조심도대분기감조효과적영향규률。시험결과표명：재95000DWT산화선모형저부설치요조병분기，모형총조력대폭도강저。수착기류량증가，조력강저폭도증대，존재일개포화기류량：당Fr＝0．139～0．182시，수항속증가，감조솔정강저추세；요조심도증가，분기감조효과제고，단불분기시요조회도치조력증가，차조력증가폭도수요조심도증가이증가，존재일개최가요조심도（ h／B＝0．024）；압재배수량감조솔고우설계배수량감조솔。요조심도20 mm，설계항속하，포화분기（Cq＝0．210）시，설계배수량하절대감조솔가체26．99％，압재배수량하절대감조솔가체33．79％。
In order to investigate the implementation of air lubrication on full?formed ships, a model experiment of a 95000DWT bulk carrier at a scale of 1︰38 was carried out in a towing tank. The effect of air flow rate, velocity, displacement and hollow depth on drag reduction was investigated. The results show that the model’ s total resist?ance decreases rapidly when a hollow is set up at the bottom hull of the 95000DWT bulk carrier with air injection. The reduction of resistance becomes more obvious as the air flow rate increases. There is also a saturated air flow rate in which the resistance reduces slowly when the air flow rate is greater than it. When Fr =0.139~0.182, the resistance reduction rate decreases with the velocity increasing and the effect of drag reduction improves as the hol?low depth increases. However, without air injection, the hull resistance will increase due to the hollow and that the increase is larger with the increasing of the hollow depth, thus, there is an optimum hollow depth ( h/B=0.024) . The reduction of resistance is greater at the ballasted displacement than the designed displacement. The absolute re?sistance comes to 26.99% at the designed displacement with a hollow 20mm deep at the designed velocity and the saturated air flow rate ( Cq =0.210) , and it comes to 33.79% at the ballasted displacement.
