【作者】 潘振生；

【导师】 钟兢军；

【作者基本信息】 大连海事大学 ， 轮机工程， 2012， 硕士

【摘要】 旋转冲压压缩转子作为一种新型压缩系统,集合了超声速进气道及传统轴流、离心压气机的设计方法,它具有以下优点：单级压比高、重量轻、体积小等。近几十年来,针对这一新型压缩系统国内外开展了很多相关研究。本文主要针对叶顶间隙对旋转冲压压缩转子的影响进行研究。本文工作主要分为三方面：第一部分首先利用CAD软件对具有间隙的旋转冲压压缩转子建模并进行网格无关性研究；第二部分主要在上述计算基础上对设计工况下间隙大小对旋转冲压压缩转子的影响进行研究；第三部分主要研究非设计工况下,转速和背压对具有间隙的旋转冲压压缩转子的影响。第一部分作为后续研究的基础,首先利用CAD软件对具有间隙的旋转冲压压缩转子进行建模,并且针对具有0.5%隔板高度间隙的旋转冲压压缩转子进行网格无关性研究。研究表明网格总数为45万的方案可以较好的对具有间隙的旋转冲压压缩转子进行数值模拟,并且可以较好地捕捉到间隙区域流场细节。第二部分主要在上述计算基础上对旋转压缩转子的六种间隙方案进行数值模拟研究。研究表明间隙大小对旋转冲压压缩转子的影响显著。随着间隙增大,旋转冲压压缩转子总体性能及流场均显著变化。综合考虑各间隙方案,具有0.5%隔板高度间隙的旋转冲压压缩转子综合性能较优。第三部分主要研究在非设计工况下,转速和背压的改变对具有间隙的旋转冲压压缩转子的影响,并获得其性能曲线。研究表明,对于固定几何结构的具有间隙的旋转冲压压缩转子,吸入的空气流量不仅受转速影响并且与背压有关系。更多还原

【Abstract】 Ram-rotor is a new compression system, which uses the design of supersonic aircraft intake, the traditional axial compressor and the centrifugal—flow compressor. What is more, it has the advantages of the high ratio、light weight and the small volume. During the past years, focusing the new compression system, a lot of researches have been carried out. The influence of the tip clearance on the ram-rotor is carried out in this article.In order to achieve the above objectives, the research is carried out as follows:part one is the basis of the numerical research, it focuses on modeling the ram-rotor with different clearance and discussing the grid independence. Part two mainly concerns the influence of the tip clearance on the ram-rotor in the design condition. Part three concentrates on the influence of the tip clearance on the ram-rotor in the off design condition, especially the different speed and back pressure.Part one is the basis of the whole research; firstly the ram-rotor with the tip clearance is built with the CAD software. Besides the grid independence research on the ram-rotor with the tip clearance which is the 0.5% height of the strake is discussed. According to the research, the ram-rotor with the tip clearance can be analyzed in the case of the grid amount at 0.45 million, besides the details of the flow field can be captured distinctly.Part two mainly focuses on the numerical research on the ram-rotor with six kinds of tip clearance, which is on the basis of the part one. According to the research, the size of the tip clearance has significant influence on the ram-rotor. As the size of the tip clearance increase, the total performance and the flow field change very much.Part three concentrates on the influence of the tip clearance on the ram-rotor in the off design condition, especially under the different speed and back pressure. What is more, the characteristic curves is obtained. According to the above research, the speed and the back pressure can significantly change the total performance and the structure of the shock wave.更多还原