本文選題：水電站廠房 + 流固耦合��； 參考：《工程科學與技術(shù)》2017年S2期

【摘要】：在現(xiàn)有大中型水電站機組普遍存在水力振動的情況下,如何建立一套完善的水力-廠房耦合振動模型,特別是適用于大型復雜工程計算的流固耦合界面數(shù)據(jù)傳遞模型,并以此進行水電站廠房流激振動的預測,是廠房振動方面亟待研究的課題。本文探討了國內(nèi)外常用的幾種流固耦合數(shù)據(jù)傳遞插值算法的優(yōu)劣,將近年來在航空、地形學、醫(yī)學等領域廣泛應用的C2緊支徑向基函數(shù)插值方法進行了優(yōu)化與改進,改善了該插值方法存在的精度和效率之間的平衡問題,并基于此建立廠房流固耦合數(shù)據(jù)傳遞模型,進行水電站廠房流激振動分析。分析結(jié)果表明,當流體網(wǎng)格數(shù)遠大于結(jié)構(gòu)網(wǎng)格數(shù)時(5倍以上),局部插值法的最大誤差控制在工程應用可接受范圍內(nèi),在網(wǎng)格量巨大的相關(guān)工程計算中可以考慮使用局部插值法以節(jié)省時間成本;改進后的C2緊支徑向基函數(shù)可以進一步減小誤差,提高精度,在大型復雜耦合界面數(shù)據(jù)傳遞中具有很大的優(yōu)勢;流道中壓力脈動以葉片通過頻率為主,水輪機葉片與導葉間靜動干擾所引起的流體脈動壓力對廠房整體結(jié)構(gòu)振動影響較為明顯。
[Abstract]:Under the condition that hydraulic vibration exists widely in existing large and medium-sized hydropower units, how to establish a set of perfect hydro-powerhouse coupling vibration model, especially the fluid-structure coupling interface data transfer model suitable for large-scale complex engineering calculation. It is an urgent task to predict the fluid-induced vibration of hydropower plant. This paper discusses the merits and demerits of several fluid-solid coupling data transfer interpolation algorithms commonly used at home and abroad, and optimizes and improves the C2-tight supported radial basis function interpolation method, which has been widely used in aviation, topography, medicine and other fields in recent years. The balance between precision and efficiency of the interpolation method is improved, and based on this, the fluid-structure coupling data transfer model of the powerhouse is established, and the fluid-induced vibration analysis of hydropower plant is carried out. The results show that the maximum error of the local interpolation method is controlled within the acceptable range of engineering applications when the number of fluid meshes is much larger than that of the structural meshes. The local interpolation method can be used to save time cost in the engineering calculation of large mesh volume, and the improved C2-tight supported radial basis function can further reduce the error and improve the accuracy. The pressure pulsation in the flow channel is dominated by the passage frequency of the blade. The effect of fluid pulsation pressure caused by static and dynamic interference between turbine blade and guide vane on the whole structure vibration of powerhouse is obvious.
【作者單位】： 武漢大學水資源與水電工程科學國家重點實驗室;
【基金】：國家自然科學基金資助項目(51679175;51409194)
【分類號】：TV312;TV731

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