水轮机槽道内导叶动态绕流水力特性大涡模拟分析
发布时间：2019-04-24 10:48
【摘要】：为进一步探索水轮机导叶在调节过程中产生强瞬变流时水流和导叶间的非线性流固耦合机理,该文基于大涡模拟和二维瞬态N-S方程,应用ANSYS FLUENT软件中的任意拉格朗日-欧拉动网格技术和非迭代时间推进格式对槽道内导叶的关闭运动过程进行数值模拟,研究导叶绕流后的流场动态变化水力特性及涡激振动特性。结果表明:导叶关闭过程中槽道内的压力场、速度场、涡量场呈现出明显的非定常特征;卡门涡频率约为水轮机转轮转频的0.3倍,极易诱发低频压力脉动,随着关闭时刻的结束导叶后尾迹涡形态呈现出明显的卡门涡脱落过程;关闭过程中转动导叶的升、阻力系数随时间表现出非线性动力响应特征。揭示了低频压力振荡的产生与导叶调节关闭动作后导叶尾部的卡门涡列有关,卡门涡列诱发的非线性流激振动是影响水轮机水力稳定性和上游管道系统水力共振的主要因素。该方法可为有效模拟水力机械瞬态非线性流固耦合问题提供参考。
[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.
【作者单位】： 云南农业大学水利学院;昆明理工大学工程力学系;
【基金】：国家自然科学基金项目(51541913,51279071) 云南农业大学自然科学青年基金项目(2015ZR17)
【分类号】：TK730.1
[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.
【作者单位】： 云南农业大学水利学院;昆明理工大学工程力学系;
【基金】：国家自然科学基金项目(51541913,51279071) 云南农业大学自然科学青年基金项目(2015ZR17)
【分类号】：TK730.1
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1 李文锋;罗兴，
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