Method for determining initial cavitation position of runner blade of axial-flow model water turbine
A runner blade and initial position technology, which is applied in the field of determining the initial cavitation position of the runner blade of an axial flow model water turbine, can solve the problem of low accuracy and achieve the effect of ensuring accuracy
Active Publication Date: 2021-05-25
哈动国家水力发电设备工程技术研究中心有限公司 +2
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Problems solved by technology
[0004] The present invention is to solve the problem of low accuracy in the method of visually determining the cavitation phenomenon at the runner blades
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specific Embodiment approach 1
[0032] A method for determining the initial cavitation position of runner blades of an axial-flow model water turbine described in this embodiment includes the following steps:
[0033] 1. Start the axial flow model turbine;
[0034] 2. Adjust the operating conditions of the axial flow model turbine so that the runner blades of the axial flow model turbine are in a non-cavitation state;
[0035] 3. Keep the running condition of the axial flow model turbine stable, and collect the vibration signal of the runner chamber;
[0036] 4. Calculate the spectral power distribution of the vibration signal in the runner chamber of the axial flow model turbine;
[0037] 5. Determine the frequency of the energy distribution trend boundary point of the vibration signal spectrum power distribution of the axial flow model turbine chamber;
[0038] The energy distribution trend cut-off point frequency of the vibration signal spectrum power distribution of the axial-flow model turbine chamber...
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The invention discloses a method for determining the initial cavitation position of a runner blade of an axial-flow model water turbine, and relates to the method for determining the initial cavitation position of the runner blade of the axial-flow model water turbine. The problem that the accuracy of a method for determining the cavitation phenomenon at a runner blade through visual inspection is low is solved. The invention provides an energy distribution trend demarcation point concept of the power distribution of the vibration signal spectrum of the runner chamber of the axial-flow model water turbine for representing the change of an energy distribution rule in the power distribution of the vibration signal spectrum of the runner chamber of the axial-flow model water turbine. The phase angle difference between the energy change gradients of the vibration signals of the runner chamber of the axial-flow type model water turbine on the two sides of the energy distribution trend demarcation point frequency of the power distribution of the vibration signal spectrum of the runner chamber of the axial-flow type model water turbine is determined, and the phase angle difference serves as a judgment basis to judge the initial cavitation position of the runner blade of the axial-flow type model water turbine. The method is mainly used for determining the initial cavitation position of the runner blade of the axial-flow model water turbine.
Description
technical field [0001] The invention relates to a method for determining the cavitation initial position of runner blades of an axial-flow model water turbine. Background technique [0002] With the further deepening of the research on the internal characteristics of the axial flow turbine and the gradual improvement of the user's requirements for the stability of the turbine, it is necessary to ensure that the axial flow turbine, especially the giant axial flow turbine, is in a cavitation-free state, especially the runner blades. Safe and stable operation has become an important indicator for assessing the operating status of the unit under the state of modernization. [0003] Given the current state of the art, it is simply impossible to determine on site when cavitation occurs at the runner blades of axial flow turbines. Cavitation at the runner blades can only be studied on axial flow model turbines. The traditional research method is to observe whether there are conti...
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IPC IPC(8): G01M7/02
CPCG01M7/025G01M7/022Y02E10/20
Inventor 徐洪亮范寿孝赵越李友平赵英男郭全宝孙永新黎辉黄建荧林家洋王昕刘智良张金伟邵国辉徐用良赵伟明宏林郭彦峰韩东邑明亮董宇刘登峰白洁王润鹏贺婷婷任玉堂许彬吴喜东曹卫华崔金声郑程
Owner 哈动国家水力发电设备工程技术研究中心有限公司