本文選題：對轉螺旋槳 + 敞水性能��； 參考：《大連理工大學》2015年碩士論文

【摘要】：近年來,人們對于船舶的快速性提出了更高的要求,特別是軍事方面,艦船快速性一直是專家研究的重大課題,在民用方面,由于生活節(jié)奏的加快和能源的匱乏,人們對于船舶的快速性和節(jié)能性給予了更高的期望,螺旋槳作為船舶推進的核心所在,不管是在軍用還是民用方面都得到了很高的重視。對轉螺旋槳作為最為有效提高船舶快速性和推進效率的特種螺旋槳,正得到越來越多學者的重視,但是對于其實質性的研究相對較少,本文主要基于CFD數(shù)值模擬方法,研究對轉螺旋槳水動力性能,具體內(nèi)容為：1、對B系列螺旋槳B4-40進行了CFD數(shù)值計算。比較了B4-40在Standard k-ε、 RNG k-ε.RSM.SSTk-ω四種湍流模型下的敞水性能,考慮到計算精度和計算時效,認為SSTk-ω模型較佳。然后對B4-40螺旋槳壓力特性和尾流場進行了分析研究。2、進一步完成了B系列對轉螺旋槳的CFD數(shù)值計算,對比RSM和SSTk-ω湍流模型數(shù)值計算結果,SSTk-ω模型更佳。相比單槳,由于對轉槳后槳處于前槳尾流里,后槳計算誤差較大,建議采用動網(wǎng)格技術,減小數(shù)值計算誤差。3、選擇兩組對轉槳模型進行CFD數(shù)值計算,對比分析結果后,得到對轉槳槳距比L/D和直徑比Da/Df的最佳參數(shù),同時對對轉槳數(shù)值計算結果和尾流場進行對比分析,研究造成不同結果的原因。4、選擇兩個最好的對轉槳模型分別與B4-76.8、B4-78螺旋槳的敞水性能進行比較,發(fā)現(xiàn)在相同J下,對轉槳效率略低于單槳,但是推力遠遠大于后者；在相同功率系數(shù)時,對轉槳的敞水效率明顯好于單槳,效率提高最大超過7.46%,表明對轉槳的高效性。
[Abstract]:In recent years, people have put forward higher requirements for the speed of ships, especially in the military, ship rapidity has been an important subject of expert research. In civilian, due to the accelerated pace of life and the lack of energy, As the core of ship propulsion, propeller has been attached great importance to both military and civil aspects. As the most effective special propeller to improve the ship speed and propulsion efficiency, more and more scholars are paying attention to the propeller, but the substantial research is relatively few, this paper is mainly based on CFD numerical simulation method. The hydrodynamic performance of rotating propeller is studied. The CFD numerical calculation of B series propeller B4-40 is carried out. The open water performance of B4-40 in four turbulence models, Standard k- 蔚, RNG k- 蔚. RSM.SSTk- 蠅, is compared. Considering the calculation accuracy and calculation time, the SSTk- 蠅 model is considered to be better. Then, the pressure characteristics and wake field of B4-40 propeller are analyzed and studied, and the CFD numerical calculation of B series propeller is further completed, which is better than that of RSM and SSTk- 蠅 turbulence model. Compared with the single propeller, because the rear propeller is in the wake of the front propeller, the calculation error of the rear propeller is larger. It is suggested that the dynamic grid technique be used to reduce the numerical calculation error of the rotor. Two groups of rotor models are selected to carry out the CFD numerical calculation, and the results are compared. The optimum parameters of the pitch ratio L / D and the diameter ratio of D / D are obtained, and the numerical results and the wake flow field are compared and analyzed. The reasons for the different results are studied. 4. The open water performance of the two best propeller models is compared with that of the B4-76.8U B4-78 propeller. It is found that the propeller efficiency is slightly lower than that of the single propeller under the same J, but the thrust is much higher than the latter. At the same power coefficient, the open water efficiency of the propeller is obviously better than that of the single propeller, and the maximum increase of the efficiency is more than 7.46, which indicates that the efficiency of the propeller is high.
【學位授予單位】：大連理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U664.33

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