向心涡轮进气结构气动分析与优化研究
发布时间：2018-10-12 14:45
【摘要】：压缩空气储能技术能够解决可再生能源发电大规模并网问题,同时可以对电网进行“削峰填谷”、减少电网总的装机容量、节约能源,具有巨大的发展潜力。因此研究压缩空气储能技术对于解决当前社会面临的能源、环境问题具有重要的意义。 膨胀机是压缩空气储能系统的核心部件之一,MW级压缩空气储能系统膨胀机采用向心涡轮结构形式。向心涡轮主要包括进气结构、叶轮及排气结构,其中进气结构性能对整个向心涡轮性能具有显著影响。本文主要针对集气室和蜗壳两种进气结构形式开展研究,在分析集气室内部流动的基础上,设计多种向心涡轮进气蜗壳,并数值对比分析不同进气结构对向心涡轮性能的影响。主要研究内容如下： 1.采用二维设计方法为某向心涡轮设计矩形截面蜗壳,分别对进气结构为蜗壳和集气室的向心涡轮进行整级全周数值计算,对比研究进气结构对向心涡轮性能的影响。结果表明：集气室内部流动有较大的损失,同时增强了导叶流道内二次流；与集气室相比,蜗壳进气结构使向心涡轮整级的效率、质量流量和功率都有一定程度的提高。 2.针对所研究向心涡轮设计不同截面尺寸的蜗壳,研究蜗壳无量纲气动尺寸S1和蜗壳截面宽度B对向心涡轮整级性能的影响,获得了相匹配的最优无量纲气动尺寸S1,发现蜗壳截面宽度B的变化对向心涡轮的性能影响很小。 3.开展蜗壳非对称性对涡轮性能影响研究,分析蜗壳内部流动结构和二次流分布,研究发现对称蜗壳和非对称蜗壳在蜗壳出口导叶前缘均形成漩涡结构,对称蜗壳为轴向对称的两个漩涡,而非对称蜗壳靠近机匣侧的漩涡较强,靠近轮毂侧的较弱,非对称蜗壳使向心涡轮的性能略有降低。
[Abstract]:Compressed air energy storage technology can solve the problem of large-scale grid connection of renewable energy generation, at the same time, it can "cut the peak and fill the valley", reduce the total installed capacity of power grid, save energy, and have great development potential. Therefore, the study of compressed air energy storage technology is of great significance to solve the energy and environmental problems that the society is facing. Expander is one of the core components of compressed air energy storage system. The expansion machine of MW class compressed air energy storage system adopts the form of concentric turbine. The centripetal turbine mainly includes the intake structure, impeller and exhaust structure, in which the performance of the intake structure has a significant effect on the performance of the whole centripetal turbine. Based on the analysis of the inner flow of the gas collecting chamber, this paper mainly studies the two kinds of intake air structure forms of the collecting chamber and volute. On the basis of analyzing the internal flow of the gas collecting chamber, several kinds of inlet volute cases of the concentric turbine are designed, and the effects of different intake structures on the performance of the concentric turbine are compared and analyzed numerically. The main contents are as follows: 1. A two-dimensional design method is used to design a rectangular section volute for a centripetal turbine. The full-cycle numerical calculation of a concentric turbine with a volute and a collecting chamber is carried out, respectively. The effects of the intake structure on the performance of a concentric turbine are compared and studied. The results show that the flow loss in the gas collecting chamber is great, and the secondary flow in the guide vane passage is enhanced, and the volute intake structure makes the integrated efficiency of the centripetal turbine compared with the gas collecting chamber. Mass flow and power have a certain degree of improvement. 2. The effects of dimensionless aerodynamic dimensions S1 and cross-section width B of the volute on the integral performance of the centripetal turbine are studied. The optimal dimensionless aerodynamic size S _ 1 is obtained. It is found that the change of volute section width B has little effect on the performance of the concentric turbine. The effect of volute asymmetry on turbine performance is studied. The flow structure and secondary flow distribution in the volute are analyzed. It is found that both symmetric volute and asymmetric volute form a swirl structure at the front edge of the guide vane at the outlet of the volute. The symmetrical volute is two axially symmetric swirls, while the asymmetric volute is stronger near the casing side and weaker near the hub side. The asymmetric volute makes the performance of the centripetal turbine slightly lower.
【学位授予单位】：中国科学院研究生院（工程热物理研究所）
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TK02;TB653
本文编号：2266522
[Abstract]:Compressed air energy storage technology can solve the problem of large-scale grid connection of renewable energy generation, at the same time, it can "cut the peak and fill the valley", reduce the total installed capacity of power grid, save energy, and have great development potential. Therefore, the study of compressed air energy storage technology is of great significance to solve the energy and environmental problems that the society is facing. Expander is one of the core components of compressed air energy storage system. The expansion machine of MW class compressed air energy storage system adopts the form of concentric turbine. The centripetal turbine mainly includes the intake structure, impeller and exhaust structure, in which the performance of the intake structure has a significant effect on the performance of the whole centripetal turbine. Based on the analysis of the inner flow of the gas collecting chamber, this paper mainly studies the two kinds of intake air structure forms of the collecting chamber and volute. On the basis of analyzing the internal flow of the gas collecting chamber, several kinds of inlet volute cases of the concentric turbine are designed, and the effects of different intake structures on the performance of the concentric turbine are compared and analyzed numerically. The main contents are as follows: 1. A two-dimensional design method is used to design a rectangular section volute for a centripetal turbine. The full-cycle numerical calculation of a concentric turbine with a volute and a collecting chamber is carried out, respectively. The effects of the intake structure on the performance of a concentric turbine are compared and studied. The results show that the flow loss in the gas collecting chamber is great, and the secondary flow in the guide vane passage is enhanced, and the volute intake structure makes the integrated efficiency of the centripetal turbine compared with the gas collecting chamber. Mass flow and power have a certain degree of improvement. 2. The effects of dimensionless aerodynamic dimensions S1 and cross-section width B of the volute on the integral performance of the centripetal turbine are studied. The optimal dimensionless aerodynamic size S _ 1 is obtained. It is found that the change of volute section width B has little effect on the performance of the concentric turbine. The effect of volute asymmetry on turbine performance is studied. The flow structure and secondary flow distribution in the volute are analyzed. It is found that both symmetric volute and asymmetric volute form a swirl structure at the front edge of the guide vane at the outlet of the volute. The symmetrical volute is two axially symmetric swirls, while the asymmetric volute is stronger near the casing side and weaker near the hub side. The asymmetric volute makes the performance of the centripetal turbine slightly lower.
【学位授予单位】：中国科学院研究生院（工程热物理研究所）
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TK02;TB653
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