【摘要】：為進(jìn)一步探索水輪機(jī)導(dǎo)葉在調(diào)節(jié)過(guò)程中產(chǎn)生強(qiáng)瞬變流時(shí)水流和導(dǎo)葉間的非線性流固耦合機(jī)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(dòng)網(wǎng)格技術(shù)和非迭代時(shí)間推進(jìn)格式對(duì)槽道內(nèi)導(dǎo)葉的關(guān)閉運(yùn)動(dòng)過(guò)程進(jìn)行數(shù)值模擬,研究導(dǎo)葉繞流后的流場(chǎng)動(dòng)態(tài)變化水力特性及渦激振動(dòng)特性。結(jié)果表明:導(dǎo)葉關(guān)閉過(guò)程中槽道內(nèi)的壓力場(chǎng)、速度場(chǎng)、渦量場(chǎng)呈現(xiàn)出明顯的非定常特征;卡門(mén)渦頻率約為水輪機(jī)轉(zhuǎn)輪轉(zhuǎn)頻的0.3倍,極易誘發(fā)低頻壓力脈動(dòng),隨著關(guān)閉時(shí)刻的結(jié)束導(dǎo)葉后尾跡渦形態(tài)呈現(xiàn)出明顯的卡門(mén)渦脫落過(guò)程;關(guān)閉過(guò)程中轉(zhuǎn)動(dòng)導(dǎo)葉的升、阻力系數(shù)隨時(shí)間表現(xiàn)出非線性動(dòng)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(dòng)作后導(dǎo)葉尾部的卡門(mén)渦列有關(guān),卡門(mén)渦列誘發(fā)的非線性流激振動(dòng)是影響水輪機(jī)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(jī)械瞬態(tài)非線性流固耦合問(wèn)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(xué)水利學(xué)院;昆明理工大學(xué)工程力學(xué)系;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(51541913,51279071) 云南農(nóng)業(yè)大學(xué)自然科學(xué)青年基金項(xiàng)目(2015ZR17)
【分類號(hào)】：TK730.1

【相似文獻(xiàn)】

相關(guān)期刊論文 前10條

1 呂文燦;旋轉(zhuǎn)導(dǎo)葉風(fēng)機(jī)的理論分析與試驗(yàn)研究[J];華中理工大學(xué)學(xué)報(bào);1991年01期

2 嚴(yán)敬;空間導(dǎo)葉設(shè)計(jì)新方法[J];四川工業(yè)學(xué)院學(xué)報(bào);1991年Z1期

3 李樹(shù)森;導(dǎo)葉制造的新工藝[J];大電機(jī)技術(shù);1991年05期

4 張蓉生;導(dǎo)葉關(guān)閉水力矩計(jì)算的探討[J];四川水力發(fā)電;1994年01期

5 楊勇;;內(nèi)支承體、導(dǎo)葉室專用鏜孔工具[J];上海大中型電機(jī);2010年02期

6 沈宗伊;;活塞式開(kāi)關(guān)導(dǎo)葉工具介紹[J];水電機(jī)電安裝技術(shù);1980年04期

7 劉飛旗;;焊接導(dǎo)葉介紹[J];水電機(jī)電安裝技術(shù);1981年04期

8 裘昌奰 ,王丁;高爐用軸流壓氣機(jī)導(dǎo)葉變角度計(jì)算[J];動(dòng)力工程;1983年05期

9 袁曾壽;壓氣機(jī)可轉(zhuǎn)導(dǎo)葉機(jī)構(gòu)的設(shè)計(jì)方法[J];艦船科學(xué)技術(shù);1983年03期

10 錢宗遠(yuǎn),李俊;汽輪機(jī)空心導(dǎo)葉變形原因及處理[J];汽輪機(jī)技術(shù);1992年04期

相關(guān)會(huì)議論文 前10條

1 李文鋒;羅興，

本文編號(hào)：2464387