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  本文關鍵詞： 液力偶合器 流場仿真 力矩系數(shù)修正 原始特性 試驗研究　出處：《中國艦船研究院》2011年碩士論文　論文類型：學位論文

【摘要】：液力偶合器是一種利用液體動能進行能量傳遞的液力傳動機械。其具有柔性傳動、減緩沖擊、輕載啟動、過載保護、隔離扭振、協(xié)調多動力機均衡驅動等優(yōu)異功能,廣泛應用于船舶、冶金、發(fā)電、礦山等重型工業(yè)。 本文通過理論分析和仿真技術研究,建立了液力偶合器流場仿真分析方法,對液力偶合器力矩系數(shù)λ_B進行理論研究,結合流場仿真結果,歸納總結λ_B系數(shù)相對于轉速n_B的變化規(guī)律,并應用JO65XR型液力偶合器進行了試驗驗證。主要研究內容如下。 (1)液力偶合器流場仿真分析方法。首先研究了現(xiàn)今流場仿真分析技術,包括湍流模型、網格生成技術等,形成液力偶合器流場仿真分析方法指導流程。然后對液力偶合器的工況和流場做出一定的假設,以方便幾何建模。結合STAR-CCM+軟件,深入研究液力偶合器三維流場建模及仿真的方法與過程,主要包括幾何模型、計算網格模型、物理模型設置、邊界條件、收斂準則、結果顯示等。最后基于液力偶合器額定工況下流場的仿真結果,本文分析了液力偶合器整體壁面、軸面、Interface面的流場特性,揭示了流場速度和壓力變化的分布情況,對其內部流場特性及生成原因進行了詳細分析。 本文應用JO65XR型液力偶合器進行驗證試驗,繪制了不同滑差下的仿真曲線和試驗曲線,兩條曲線吻合一致,額定工況下仿真值與試驗值的平均誤差為6.53%,最大誤差為10.95%,驗證了本文提出的液力偶合器流場仿真分析方法是可行的。 (2)液力偶合器力矩系數(shù)λ_B的修正。根據(jù)多工況流場仿真分析的結果——當滑差i不變時力矩系數(shù)λ_B會隨著轉速n_B不同而變化,本文對液力偶合器力矩系數(shù)λ_B進行理論研究,獲得液力偶合器λ_B = f ( i ,Re)或λ_B = f ( i ,n_B)的函數(shù)關系,并進一步說明力矩系數(shù)λ_B并非如通常認識的那樣僅和滑差i有關,而是受到滑差i和雷諾數(shù)Re(或者轉速n_B )的共同影響。然后進行液力偶合器多工況輸出扭矩仿真,歸納總結力矩系數(shù)λ_B與轉速n_B的規(guī)律,對λ_B提出一套與n_B相關的修正系數(shù),使其滿足λB = f ( i ,n_B)的要求。 根據(jù)試驗結果,繪制了試驗曲線、修正曲線和未修正曲線,修正曲線明顯比未修正曲線更接近試驗曲線,修正系數(shù)能夠反應出轉速n_B對力矩系數(shù)λ_B的影響趨勢,修正前平均誤差為10.36%,最大誤差為15.93%,而修正后平均誤差降為6.08%,最大誤差降為10.88%。從而驗證了液力偶合器λ_B系數(shù)修正理論的正確性。 本文的液力偶合器流場仿真分析方法應用于液力偶合器設計之中,可減少研制樣機及試驗的工作量,達到省時和省力的目的。本文對液力偶合器力矩系數(shù)λ_B的修正,進一步提高了對液力偶合器特性的認識,對提高其設計和控制精度具有指導作用和實用價值。
[Abstract]:Hydraulic coupler is a kind of hydraulic transmission machinery which uses liquid kinetic energy to transfer energy. It has flexible transmission, slow impact, light load start, overload protection and isolation of torsional vibration. It is widely used in heavy industry, such as ship, metallurgy, power generation, mining and so on. Based on the theoretical analysis and simulation technology, a simulation analysis method for fluid field of hydraulic coupling is established in this paper. The torque coefficient 位 B of hydraulic coupling is studied theoretically, and combined with the result of flow field simulation. The variation law of 位 _ S _ B coefficient relative to rotational speed _ n _ B is summarized and tested with JO65XR type hydraulic coupler. The main contents are as follows. Firstly, the current flow field simulation and analysis techniques, including turbulence model, mesh generation technology and so on, are studied. The flow field simulation analysis method of hydraulic coupling is formed to guide the flow. Then the working conditions and flow field of hydraulic coupling are hypothesized in order to facilitate geometric modeling. Combined with STAR-CCM software. The methods and processes of 3D flow field modeling and simulation of hydraulic coupling are deeply studied, including geometric model, computational grid model, physical model setting, boundary condition and convergence criterion. The results show that. Finally, based on the simulation results of the flow field under the rated working conditions of the hydraulic coupling, the flow field characteristics of the integral wall and axial surface of the hydraulic coupling are analyzed in this paper. The distribution of the velocity and pressure variation of the flow field is revealed, and the characteristics of the internal flow field and the causes of its formation are analyzed in detail. In this paper, the JO65XR type hydraulic coupling is used to carry out the verification test, and the simulation curve and the test curve under different slippage are drawn, and the two curves are consistent with each other. The average error between the simulated value and the experimental value is 6.53 and the maximum error is 10.95 under rated working conditions. The method proposed in this paper is proved to be feasible. 2) Modification of torque coefficient 位 B of hydraulic coupling. According to the result of simulation analysis of multi-condition flow field, the torque coefficient 位 B will change with the speed nb when the slip difference I is constant. In this paper, the torque coefficient 位 _ s _ B of hydraulic couplings is studied theoretically, and the functional relations of 位 _ s _ p _ B = f (I _ Ree) or 位 _ s _ B = f (I / n _ B) are obtained. Furthermore, it is shown that moment coefficient 位 B is not only related to slip I as is generally known. It is influenced by slip I and Reynolds number Re. then the torque output simulation of hydraulic coupling is carried out, and the law of torque coefficient 位 B and rotational speed NSP B is summarized. In this paper, a set of correction coefficients related to 位 _ s _ B are presented to satisfy the requirements of 位 _ B = f (I / n _ s _ B). According to the test results, the test curve, the modified curve and the uncorrected curve are drawn. The modified curve is more close to the test curve than the uncorrected curve. The correction coefficient can reflect the influence trend of the speed NSP B on the torque coefficient 位 B. The average error before the correction is 10.36 and the maximum error is 15.93%. The average error is reduced to 6.08 and the maximum error is reduced to 10.88, which verifies the correctness of the modified theory of 位 _ B coefficient of hydraulic coupling. In this paper, the flow field simulation analysis method of hydraulic coupling is applied to the design of hydraulic coupling, which can reduce the workload of developing prototype and testing. In order to save time and effort, the torque coefficient 位 B of hydraulic coupler is modified in this paper, which further improves the understanding of the characteristics of hydraulic coupler. It has guiding function and practical value to improve its design and control precision.
【學位授予單位】：中國艦船研究院
【學位級別】：碩士
【學位授予年份】：2011
【分類號】：TH137.331

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