【摘要】：為進一步探索水輪機導(dǎo)葉在調(diào)節(jié)過程中產(chǎn)生強瞬變流時水流和導(dǎo)葉間的非線性流固耦合機理,該文基于大渦模擬和二維瞬態(tài)N-S方程,應(yīng)用ANSYS FLUENT軟件中的任意拉格朗日-歐拉動網(wǎng)格技術(shù)和非迭代時間推進格式對槽道內(nèi)導(dǎo)葉的關(guān)閉運動過程進行數(shù)值模擬,研究導(dǎo)葉繞流后的流場動態(tài)變化水力特性及渦激振動特性。結(jié)果表明:導(dǎo)葉關(guān)閉過程中槽道內(nèi)的壓力場、速度場、渦量場呈現(xiàn)出明顯的非定常特征;卡門渦頻率約為水輪機轉(zhuǎn)輪轉(zhuǎn)頻的0.3倍,極易誘發(fā)低頻壓力脈動,隨著關(guān)閉時刻的結(jié)束導(dǎo)葉后尾跡渦形態(tài)呈現(xiàn)出明顯的卡門渦脫落過程;關(guān)閉過程中轉(zhuǎn)動導(dǎo)葉的升、阻力系數(shù)隨時間表現(xiàn)出非線性動力響應(yīng)特征。揭示了低頻壓力振蕩的產(chǎn)生與導(dǎo)葉調(diào)節(jié)關(guān)閉動作后導(dǎo)葉尾部的卡門渦列有關(guān),卡門渦列誘發(fā)的非線性流激振動是影響水輪機水力穩(wěn)定性和上游管道系統(tǒng)水力共振的主要因素。該方法可為有效模擬水力機械瞬態(tài)非線性流固耦合問題提供參考。
[Abstract]:In order to further explore the nonlinear fluid-solid coupling mechanism between water flow and guide vane during the regulation of turbine guide vane, the paper is based on large eddy simulation and two-dimensional transient Navier-Stokes equation. An arbitrary Lagrangian-Euclidean pull grid technique in ANSYS FLUENT software and a non-iterative time-advance scheme are used to simulate the closed motion of guide vane in the channel. The hydrodynamic characteristics and vortex-induced vibration characteristics of the flow field around the guide vane are studied. The results show that the pressure field, velocity field and vorticity field in the channel show obvious unsteady characteristics during the closure of guide vane. The Kamen vortex frequency is about 0.3 times that of the turbine runner, and it is easy to induce low frequency pressure pulsation. With the closing time, the wake vortex shape of the guide vane appears obvious Kamen vortex shedding process. In the process of closing, the drag coefficient of the rotating guide vane presents a nonlinear dynamic response with time. It is revealed that the generation of low-frequency pressure oscillation is related to the Karman vortex train at the tail of the guide blade after the guide vane regulation is closed. The nonlinear flow-induced vibration induced by the Karman vortex train is the main factor affecting the hydraulic stability of the turbine and the hydraulic resonance of the upstream pipeline system. This method can be used as a reference for simulating the transient nonlinear fluid-structure coupling problem of hydraulic machinery.
【作者單位】： 云南農(nóng)業(yè)大學水利學院;昆明理工大學工程力學系;
【基金】：國家自然科學基金項目(51541913,51279071) 云南農(nóng)業(yè)大學自然科學青年基金項目(2015ZR17)
【分類號】：TK730.1

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