徑流式葉輪周期性有限元強度振動數(shù)值研究
發(fā)布時間：2019-02-16 06:02
【摘要】：徑流式葉輪是向心透平、離心壓縮機和離心泵等旋轉(zhuǎn)機械的重要部件,在工作狀態(tài)下承受著巨大的離心力,其安全可靠性至關(guān)重要。以某向心透平葉輪為研究對象,基于周期循環(huán)對稱葉輪強度振動有限元分析理論,建立了向心透平葉輪周期循環(huán)對稱數(shù)值計算模型,分析獲得了其在工作轉(zhuǎn)速狀態(tài)下的變形、應力、固有頻率及振型,計算結(jié)果表明:向心透平葉輪的最大等效應力為113MPa,位于葉輪本體內(nèi)環(huán)表面靠近進口處,該值遠小于材料的屈服極限,說明葉輪滿足強度要求;進一步將計算結(jié)果與整圈模型計算結(jié)果進行對比,不僅驗證了周期循環(huán)對稱模型計算結(jié)果的可靠性,還說明采用周期對稱模型對徑流式葉輪進行強度和振動分析可以在保證計算精度的前提下極大地提高計算效率。
[Abstract]:The run-off impeller is an important part of the rotating machinery, such as centripetal turbine, centrifugal compressor and centrifugal pump. It bears a huge centrifugal force in the working state, and its safety and reliability is very important. Based on the finite element analysis theory of the strength vibration of a concentric turbine impeller and based on the theory of periodic cyclic symmetric impeller strength vibration, a numerical model of cyclic symmetry of a concentric turbine impeller is established, and its deformation under the condition of working speed is analyzed. The calculation results show that the maximum equivalent stress of the concentric turbine impeller is 113 MPA, which is located near the inlet of the inner ring surface of the impeller body, which is far less than the yield limit of the material, indicating that the impeller meets the strength requirement. Furthermore, the calculation results are compared with those of the whole cycle model, which not only verifies the reliability of the calculation results of the periodic cyclic symmetric model, It is also shown that the calculation efficiency can be greatly improved by using the periodic symmetry model to analyze the strength and vibration of the runoff impeller under the premise of ensuring the calculation accuracy.
【作者單位】： 海軍駐大連426廠軍代表室;
【分類號】：TH113.1
[Abstract]:The run-off impeller is an important part of the rotating machinery, such as centripetal turbine, centrifugal compressor and centrifugal pump. It bears a huge centrifugal force in the working state, and its safety and reliability is very important. Based on the finite element analysis theory of the strength vibration of a concentric turbine impeller and based on the theory of periodic cyclic symmetric impeller strength vibration, a numerical model of cyclic symmetry of a concentric turbine impeller is established, and its deformation under the condition of working speed is analyzed. The calculation results show that the maximum equivalent stress of the concentric turbine impeller is 113 MPA, which is located near the inlet of the inner ring surface of the impeller body, which is far less than the yield limit of the material, indicating that the impeller meets the strength requirement. Furthermore, the calculation results are compared with those of the whole cycle model, which not only verifies the reliability of the calculation results of the periodic cyclic symmetric model, It is also shown that the calculation efficiency can be greatly improved by using the periodic symmetry model to analyze the strength and vibration of the runoff impeller under the premise of ensuring the calculation accuracy.
【作者單位】： 海軍駐大連426廠軍代表室;
【分類號】：TH113.1
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