內(nèi)外雙層垂直軸水輪機性能研究
發(fā)布時間：2019-03-10 21:23
【摘要】：海洋是蘊藏著龐大資源的能量寶庫,海洋能不但清潔環(huán)保,對生態(tài)環(huán)境影響甚微,且是一種取之不盡用之不竭的可再生綠色資源,人類所用能源的未來就在寬廣的海洋之中。潮流能水輪機是將潮流動能轉(zhuǎn)換為電能的裝置,其中固定偏角垂直軸潮流能水輪機對不同的來流方向具有良好的適應(yīng)性,且易于加工,成本較低,因而引起了廣泛的關(guān)注。單層葉片垂直軸水輪機自啟動困難、葉輪載荷波動大及低轉(zhuǎn)速時效率低的缺點,影響了它的發(fā)展優(yōu)勢。因此,本文在傳統(tǒng)固定偏角直葉片水輪機的內(nèi)部增加一層葉片,應(yīng)用CFD數(shù)值模擬方法,研究這種內(nèi)外雙層固定偏角直葉片垂直軸水輪機的性能。首先對單層垂直軸水輪機進行了二維數(shù)值模擬計算,通過與試驗結(jié)果對比驗證了數(shù)值模擬的正確性。在此基礎(chǔ)上計算得到了單層垂直軸水輪機最佳密實度范圍,及最佳葉片數(shù),從而確定了內(nèi)外雙層垂直軸水輪機外層葉輪的尺寸。然后,采用二維和三維CFD數(shù)值模擬分析了速比、內(nèi)外葉輪相位差、半徑比、弦長比、展長比、內(nèi)層葉片翼型及偏角、三維效應(yīng)等參數(shù)對水輪機性能的影響。研究結(jié)果表明雙層葉輪可有效提高水輪機的自啟動性能和低轉(zhuǎn)速下的效率,同時減小了葉片和葉輪的受力和轉(zhuǎn)矩波動。最后,論文還對內(nèi)外雙層水輪機進行了單向流固耦合分析。計算結(jié)果表明,內(nèi)層葉輪的受力狀態(tài)要明顯優(yōu)于外層葉輪;水輪機的葉片變形量遠(yuǎn)小于主軸變形量;水輪機整體的最大應(yīng)力出現(xiàn)在主軸根部,經(jīng)過校核其結(jié)構(gòu)是安全的。同時由于水輪機整體變形較小,因此無需對雙層水輪機進行雙向流固耦合分析。研究結(jié)果可為內(nèi)外雙層水輪機設(shè)計與優(yōu)化提供借鑒。
[Abstract]:The ocean is a treasure house of energy containing huge resources. The ocean energy is not only clean and environmentally friendly, but also has little influence on the ecological environment, and is an inexhaustible renewable green resource. The future of the energy used by human beings lies in the wide ocean. Tidal turbine is a device that converts the kinetic energy of tidal current into electric energy, in which the fixed deviation angle vertical axis tidal turbine has good adaptability to different flow directions, and it is easy to be machined with low cost, so it has attracted wide attention. The disadvantages of single-story vertical shaft turbine such as the difficulty of self-starting, the large fluctuation of the impeller load and the low efficiency at low speed affect its development advantage. Therefore, in this paper, a layer of blade is added to the internal of the traditional fixed biasing blade turbine, and the performance of the vertical shaft turbine with the inner and outer fixed biasing angle is studied by using the numerical simulation method of CFD. First, a two-dimensional numerical simulation of a single-story vertical shaft turbine is carried out, and the correctness of the numerical simulation is verified by comparing with the experimental results. On this basis, the optimum compactness range and the optimum number of blades of the single-layer vertical shaft turbine are obtained, and the size of the outer impeller of the internal and external double-layer vertical shaft turbine is determined. Then, two-dimensional and three-dimensional CFD are used to simulate and analyze the influence of speed ratio, phase difference between inner and outer impeller, radius ratio, chord length ratio, aspect ratio, blade profile and deflection angle, and three-dimensional effect on the performance of hydraulic turbine. The results show that the double-layer impeller can effectively improve the self-starting performance and the efficiency of the turbine at low speed, and reduce the force and torque fluctuation of the blade and impeller at the same time. Finally, the unidirectional fluid-solid coupling analysis of internal and external double-layer turbine is carried out. The calculated results show that the stress state of the inner impeller is obviously better than that of the outer impeller, the blade deformation of the turbine is much smaller than that of the main shaft, and the maximum stress of the turbine appears at the root of the spindle, and the structure of the turbine is checked to be safe. At the same time, there is no need to analyze the bi-directional fluid-structure coupling of the double-layer turbine because the overall deformation of the turbine is small. The results can be used as reference for the design and optimization of internal and external double-deck turbine.
【學(xué)位授予單位】：哈爾濱工程大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TK730;P743.1
本文編號：2438039
[Abstract]:The ocean is a treasure house of energy containing huge resources. The ocean energy is not only clean and environmentally friendly, but also has little influence on the ecological environment, and is an inexhaustible renewable green resource. The future of the energy used by human beings lies in the wide ocean. Tidal turbine is a device that converts the kinetic energy of tidal current into electric energy, in which the fixed deviation angle vertical axis tidal turbine has good adaptability to different flow directions, and it is easy to be machined with low cost, so it has attracted wide attention. The disadvantages of single-story vertical shaft turbine such as the difficulty of self-starting, the large fluctuation of the impeller load and the low efficiency at low speed affect its development advantage. Therefore, in this paper, a layer of blade is added to the internal of the traditional fixed biasing blade turbine, and the performance of the vertical shaft turbine with the inner and outer fixed biasing angle is studied by using the numerical simulation method of CFD. First, a two-dimensional numerical simulation of a single-story vertical shaft turbine is carried out, and the correctness of the numerical simulation is verified by comparing with the experimental results. On this basis, the optimum compactness range and the optimum number of blades of the single-layer vertical shaft turbine are obtained, and the size of the outer impeller of the internal and external double-layer vertical shaft turbine is determined. Then, two-dimensional and three-dimensional CFD are used to simulate and analyze the influence of speed ratio, phase difference between inner and outer impeller, radius ratio, chord length ratio, aspect ratio, blade profile and deflection angle, and three-dimensional effect on the performance of hydraulic turbine. The results show that the double-layer impeller can effectively improve the self-starting performance and the efficiency of the turbine at low speed, and reduce the force and torque fluctuation of the blade and impeller at the same time. Finally, the unidirectional fluid-solid coupling analysis of internal and external double-layer turbine is carried out. The calculated results show that the stress state of the inner impeller is obviously better than that of the outer impeller, the blade deformation of the turbine is much smaller than that of the main shaft, and the maximum stress of the turbine appears at the root of the spindle, and the structure of the turbine is checked to be safe. At the same time, there is no need to analyze the bi-directional fluid-structure coupling of the double-layer turbine because the overall deformation of the turbine is small. The results can be used as reference for the design and optimization of internal and external double-deck turbine.
【學(xué)位授予單位】：哈爾濱工程大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TK730;P743.1
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