本文選題：CFD數(shù)值計算 + 導管調(diào)距槳�。� 參考：《大連理工大學》2015年碩士論文

【摘要】：導管調(diào)距槳作為特種推進器,符合減少能耗,延長一次航行時間的要求,適用于作業(yè)時間長,作業(yè)工況復雜的漁船、拖船等。其中導管在對其水動力性能方面有著重要的影響作用。具有不同剖面參數(shù)的導管、以及導管與螺旋槳之間的安裝間隙匹配都對導管調(diào)距槳的敞水性能有影響。本文首先對導管參數(shù)對導管螺旋槳水動力性能的影響進行了研究,選取19A導管與Ka槳組合的導管螺旋槳,通過UG建模,ICEM劃分網(wǎng)格,STAR-CCM+對其進行數(shù)值計算,通過采用不同數(shù)量的網(wǎng)格驗證了網(wǎng)格的無關性,并與實驗結果進行比較。在精度滿足要求的基礎上,確定所采用的湍流模型以及邊界條件等參數(shù)。在此基礎上,通過改變導管參數(shù)與間隙匹配,具體包括導管長度、導管前緣厚度、導管與螺旋槳之間的間隙以及上下間隙的分布。通過計算分析,發(fā)現(xiàn)對于確定的導管剖面模型,減小尾部的長度以及改變前緣的厚度都會對導管槳的水動力性能產(chǎn)生影響,其中對尾部長度進行的改進產(chǎn)生的效果要更好。另外導管與螺旋槳之間間隙的變化也存在臨界值,在大于臨界值以及小于臨界值的情況下,導管螺旋槳的水動力性能隨間隙的變化規(guī)律有所區(qū)別。導管與螺旋槳上下間隙分布對導管槳的水動力性能影響不大,但是對長期工作帶來的損傷會產(chǎn)生影響。通過這些結論,可以對導管的設計或調(diào)整改進提供參考。接著本文對某設計的大側(cè)斜導管調(diào)距槳進行了數(shù)值計算。計算在不同螺距比下的敞水性能曲線,并且對導管調(diào)距槳敞水性能實驗進行介紹,將實驗結果與計算結果進行對比,結果顯示誤差在工程允許范圍內(nèi)并分析誤差原因。在此基礎上,通過改變模型邊界層網(wǎng)格布置,分析了邊界層網(wǎng)格對數(shù)值計算的影響,得到了好的計算結果所需要的邊界層網(wǎng)格布置要求。接著本文分析了導管調(diào)距槳特有的螺距比帶來的影響,不同的工況都存在最佳螺距比。最后通過改變導管與側(cè)斜槳之間的間隙,進行計算,得到了上文得到的間隙規(guī)律對不同葉型的螺旋槳也是適用的。
[Abstract]:As a special propeller, the ducted propeller meets the requirements of reducing energy consumption and prolonging the time of one voyage. It is suitable for fishing boats and tugboats with long working time and complicated working conditions. The conduit plays an important role in the hydrodynamic performance. The ducts with different profile parameters and the matching of the installation gap between the ducts and the propeller have an effect on the open water performance of the ducted pitch regulating propeller. In this paper, the influence of duct parameters on the hydrodynamic performance of ducted propeller is studied. The ducted propeller with 19A duct and Ka propeller is selected, and its numerical calculation is carried out through UG modeling ICEM mesh division and STAR-CCM. The irrelevance of the mesh is verified by using different numbers of meshes and compared with the experimental results. On the basis of satisfying the requirement of accuracy, the turbulence model and boundary conditions are determined. On this basis, by changing the matching between the duct parameters and the gap, including the length of the catheter, the thickness of the leading edge of the duct, the gap between the duct and the propeller, and the distribution of the upper and lower clearance. Through the calculation and analysis, it is found that reducing the tail length and changing the thickness of the leading edge will affect the hydrodynamic performance of the ducted propeller, and the improvement of the tail length is better. In addition, there is a critical value of the gap between the duct and the propeller. When the critical value is greater than the critical value and less than the critical value, the hydrodynamic performance of the ducted propeller varies with the clearance. The distribution of the upper and lower clearance between ducts and propellers has little effect on the hydrodynamic performance of ducted propellers, but it will have an effect on the damage caused by long-term work. Through these conclusions, we can provide reference for the design and adjustment of catheters. Then, the numerical calculation of a large-side inclined duct pitch regulating propeller is carried out in this paper. The open water performance curves with different pitch ratios are calculated and the experimental results of open water performance of ducted pitch regulating propeller are introduced. The experimental results are compared with the calculated results. The results show that the error is within the allowable range of engineering and the causes of the errors are analyzed. On this basis, by changing the grid layout of the boundary layer, the influence of the boundary layer grid on the numerical calculation is analyzed, and the requirements of the boundary layer grid arrangement for a good calculation result are obtained. Then this paper analyzes the influence of the pitch ratio of the ducted adjustable pitch propeller, and the optimal pitch ratio exists in different working conditions. Finally, by changing the gap between the duct and the propeller, it is obtained that the gap law obtained above is also applicable to the propeller with different blade types.
【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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本文編號：1906771