基于流固耦合的离心压缩机叶轮数值模拟研究

发布时间：2018-05-20 04:41

本文选题：离心压缩机 + 流固耦合　；参考：《合肥工业大学》2014年硕士论文

【摘要】：再制造与传统制造相比具有诸多明显优势，研究再制造的关键科学问题，契合国家可持续发展的迫切需求、符合国家的重大战略目标。离心压缩机机组是天然气输送管道的核心设备，是保障西气东输能源大动脉安全可靠运行的关键，大型离心压缩机在长期服役过程中由于高周疲劳、冲蚀、腐蚀等原因，易导致压缩机叶轮失效而需要进行再制造。工作中的离心压缩机叶轮往往由于长期在外场作用下产生一系列变化产生变性层，其性能控制是再制造无损清洗与毛坯复原的先行条件，，是再制造整体工艺不可或缺的一部分。对压缩机叶轮典型服役环境进行数值模拟了解变性层的外场作用是研究再制造毛坯变性层的前提。然而对单一物理场的模拟已经很难满足叶轮机械数值模拟准确性的要求，故采取多场耦合的分析方法。本文选择沈阳鼓风机集团所生产的大型长输管线压缩机作为研究对象，运用大型有限元分析软件ANSYS的ANSYS Workbench Environment(AWE)进行了压缩机核心部件叶轮叶片的流固耦合、热-结构耦合问题的数值模拟与分析，并对模型选取出口流量分别为9.5kg/s、10.0kg/s、10.5kg/s、11.0kg/s和11.5kg/s进行数值模拟，揭示了全工况下叶轮性能和流场流动情况，得出叶轮变性层典型服役环境下的温度场与载荷场，为再制造毛坯变性层形成机理制备实验研究提供了相应的数据，并且对提高压缩机叶轮性能、结构强度，增强整机运行的可靠性与安全性，延长工作寿命有着一定意义。
[Abstract]:Compared with traditional manufacturing, remanufacturing has many obvious advantages. To study the key scientific problems of remanufacturing accords with the urgent need of national sustainable development and accords with the great strategic goal of the country. The centrifugal compressor unit is the core equipment of the natural gas pipeline, and the key to ensure the safe and reliable operation of the energy artery in the west to east gas transmission. During the long service of the large centrifugal compressor, due to high cycle fatigue, erosion, corrosion and other reasons, It is easy to cause compressor impeller failure and need to be remanufactured. The centrifugal compressor impellers often produce a series of denatured layers due to a series of changes under the action of external field for a long time. The performance control of centrifugal compressor impellers is the leading condition for non-destructive cleaning and blank restoration in remanufacturing, and it is an indispensable part of the whole remanufacturing process. Numerical simulation of typical service environment of compressor impeller is the premise of studying the remanufacture of denatured layer. However, the simulation of a single physical field is difficult to meet the requirements of the accuracy of the numerical simulation of impeller machinery, so the multi-field coupling analysis method is adopted. In this paper, the large-scale long-distance pipeline compressor produced by Shenyang Blower Group is chosen as the research object, and the flow and solid coupling of impeller blade, the core component of the compressor, is carried out by using ANSYS Workbench Environment awe of the large-scale finite element analysis software ANSYS. The numerical simulation and analysis of thermal-structural coupling problem are carried out, and the flow rate of the impeller is 9.5 kg / s ~ 10.0 kg / s ~ (10. 5) kg / s and 11.5kg/s, respectively. The results show that the impeller performance and flow field flow under full working conditions are investigated. The temperature field and load field of the impeller denatured layer in typical service environment are obtained, which provides the corresponding data for the experimental study on the mechanism of the formation of the denatured layer in the remanufacturing of the blank, and it also improves the performance and the structural strength of the compressor impeller. It is significant to enhance the reliability and safety of the whole machine and prolong its working life.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TH452

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