【摘要】：由于作業(yè)需要,鉆井船會(huì)在接近船舯位置設(shè)置開口較大的月池開口,給航行阻力性能帶來不利的影響,而國(guó)內(nèi)對(duì)月池引起阻力增加的研究還處于起步階段�；诖�,本論文結(jié)合國(guó)家發(fā)改委“3000米深水鉆井船設(shè)計(jì)建造關(guān)鍵技術(shù)研發(fā)及產(chǎn)業(yè)化”課題,采用數(shù)值計(jì)算和模型試驗(yàn)相結(jié)合的方法對(duì)鉆井船阻力性能開展了研究工作。首先,對(duì)計(jì)及月池的鉆井船粘性流場(chǎng)定常和非定常CFD模擬方法進(jìn)行了研究。對(duì)帶有4個(gè)不同月池的同一鉆井船進(jìn)行了定常CFD模擬,并與試驗(yàn)結(jié)果比較,結(jié)果表明定常CFD方法預(yù)報(bào)的阻力在水體振蕩并不劇烈的低航速時(shí)有效,高航速時(shí)偏小;對(duì)帶直壁型月池和階梯型月池的同一鉆井船進(jìn)行了非定常CFD模擬,結(jié)果表明非定常方法能夠考慮月池內(nèi)水體非定常運(yùn)動(dòng)對(duì)阻力的影響,因而結(jié)果更準(zhǔn)確。基于CFD模擬結(jié)果,對(duì)月池附加阻力成因進(jìn)行了分析。其次,對(duì)鉆井船月池附加阻力進(jìn)行了試驗(yàn)研究。模型試驗(yàn)在上海交通大學(xué)循環(huán)水槽實(shí)驗(yàn)室完成,研究了不同月池形式、尺度和吃水對(duì)月池附加阻力的影響規(guī)律。結(jié)果表明,同一月池在不同航速下會(huì)表現(xiàn)處不同的振蕩模式,但在吃水-月池開口長(zhǎng)度比小于0.4時(shí)更容易體現(xiàn)為“晃蕩”模式;兩種振蕩模式下,月池附加阻力與月池內(nèi)水體振蕩幅度各自呈線性關(guān)系;月池內(nèi)流體會(huì)在一定航速范圍內(nèi)維持同一頻率的振蕩模式,即存在“鎖頻”現(xiàn)象。接著,基于模型試驗(yàn)結(jié)果,對(duì)鉆井船月池附加阻力進(jìn)行了回歸分析,提出了一種計(jì)算“晃蕩”模式下月池附加阻力的簡(jiǎn)化方法。最后,研究了階梯型月池和柵格減阻板兩種減阻方式,用試驗(yàn)方法檢驗(yàn)了其減阻效果,提出了一種能夠有效減小月池附加阻力的柵格型裝置,并申報(bào)了國(guó)家專利。
[Abstract]:Because of the operation demand, the drilling ship will set up the opening of the lunar pool near the midship, which will bring adverse influence to the navigation resistance performance. However, the research on the increase of the resistance caused by the lunar pool in China is still in its infancy. Based on this, combined with the National Development and Reform Commission "3000 meters Deepwater drilling ship Design and Construction key Technology Research and industrialization", the method of numerical calculation and model test is used to study the resistance performance of drilling ship. Firstly, the steady and unsteady CFD simulation methods of viscous flow field of drilling ship with lunar pool are studied. The steady CFD simulation of the same drilling ship with four different month ponds is carried out and compared with the experimental results. The results show that the resistance predicted by the steady CFD method is effective when the water is not oscillating intensely at low speed and small at high speed. The unsteady CFD simulation of the same drilling vessel with the straight wall lunar pool and the stepped lunar pool is carried out. The results show that the unsteady method can take into account the influence of the unsteady motion of the water body in the lunar pool on the resistance, so the results are more accurate. Based on the results of CFD simulation, the cause of additional resistance of lunar pool is analyzed. Secondly, the additional resistance of the lunar pool of drilling ship is studied experimentally. The model test was carried out in the circulating flume laboratory of Shanghai Jiaotong University. The effects of different moon pond types, scales and draught on the additional resistance of the lunar pool were studied. The results show that different oscillation modes can be observed in the same month at different speeds, but when the ratio of opening length of draught to lunar pool is less than 0.4, it is more likely to be "sloshing" mode, and under two oscillation modes, The additional drag of the lunar pool is linearly related to the amplitude of water oscillation in the lunar pool, and the fluid in the lunar pool will maintain the oscillation mode of the same frequency within a certain speed range, that is, the phenomenon of "frequency locking" exists. Then, based on the model test results, the additional resistance of the lunar pool of drilling ship is regressed, and a simplified method for calculating the additional resistance of the "sloshing" mode next month is proposed. Finally, two kinds of drag reduction methods, ladder lunar cell and grid drag reducing plate, are studied, their drag reduction effect is tested by test method, a grid type device which can effectively reduce the additional resistance of lunar pool is put forward, and the national patent is applied.
【學(xué)位授予單位】：中國(guó)艦船研究院
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U674.38

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本文編號(hào)：2241793