【作者】 宋巍；

【导师】 韩万金；

【作者基本信息】 哈尔滨工业大学 ， 动力机械及工程， 2010， 硕士

【摘要】 随着汽轮机行业的不断发展,降低生产成本、提高气动性能越来越成为设计者的追求的目标。本文研究的是从三菱公司引进的某型汽轮机高压缸内的压力级组,该压力级组具有叶片数和级数较少、单级气动负荷较高、生产成本降低、气动性能不低于常规负荷级的特点,研究该级组的设计特点和设计思想,消化吸收其设计技术,具有较大的借鉴和指导意义。特别是该级组采用的重复级静叶片弯、扭联合设计方法,有利于提高整个高压缸通流部分的气动性能。为了了解每一级叶片的设计思想,本文首先借助S2通流设计的基本理论和基本计算方法,从汽轮机叶片成型可行性的设计体系出发,进行分析、探索和总结。给出了S2通流计算的总体思路,即以一元流方案计算为基础,以S2流面选择流型和匹配计算为主,编程求解三元Euler方程和NS方程计算并辅助考察叶型局部流动状况。提炼了叶片可能采用的可控涡设计思想和弯扭联合设计思想,指出多级透平以及高负荷跨音速透平的设计宜采用沿叶高等理想焓降的抛物线型输出功规律与控制反力度沿叶高分布相结合的设计方法。然后应用到对S2计算结果的对照分析中,并通过S2通流计算方法与三维方法计算对比,验证应用S2计算方法所采用的经验参数的合理性。运用CFD计算软件FINE/TURBO为平台对叶栅流道进行了全三维数值求解,并对整个流道子午流面的相对马赫数、静压分布、不同叶高型面静压分布等计算结果进行了详细的分析,分析结论与之前S2计算结果呈现出的分布规律基本一致,再次验证了计算方法的可信度。随后对二、三级流场的气动参数进行分析,通过对静压分布、叶片表面极限流线、能量损失系数沿叶高的分布规律的计算,指出引进级组在控制静叶栅中的二次流动、控制流动分离、损失分布规律上的优缺点。更多还原

【Abstract】 With the continuous development of turbomachinery industry, reducing production costs and improving aerodynamic performance has become a designer’s goal. This paper researches on a high-pressure cylinder-type pressure steam turbine stage group introduced from Mitsubishi, the stress level group has lower blades and stages, higher single-stage pneumatic load, lower production costs and lower aerodynamic performance than the conventional stage. Studing features and ideas of the design, digesting and absorbing of its design has great reference and guidance. In particular, the group uses of design method of bend-twist joint for stator in the repeatable level, which improves aerodynamic performance of the flow path in high-pressure stage.In order to understand the idea of every blade design, using basic theory and calculating method of S2 through-flow design, this paper analyses, searches and summarizes from the design method for forming turbine blade. It also gives the general idea of S2 through-flow calculation, which is based on calculation schemas for unary form flow and primaried by selecting flow pattern and computing method through S2 stream surface,programmes to calculate the equation of Euler and NS and reviews the flowing of local blade profile.This paper extracts the theory of controlled vortex design and joint design of bending and torsion ,Multi-stage turbine and a high load of transonic turbine design should adopt the higher ideal enthalpy drop leaf along a parabolic law and control of output power against the intensity distribution along the blade height design method of combining, then applied the theory to the comparising analysis of the results for S2, with the help of comparising it with full three-dimensional calculation, shows the rationality of the experience parameter used in S2 Flow calculation.This paper uses FINE/TURBO for full three-dimensional calculation of the passage and analyze comparative mach number, static pressure distribution and other calculating results of the whole meridianplane, the conclusion is similar to the distribution showed by the result of S2 through-flow calculating method, it validates the reliability of this calculating method again. At last, this paper analyzes the parameters of flow field of the second and third stages, through calculating static pressure distribution, ultimate streamline of blade surface, distribution rule of lost energy along the blade height, then points out the advantages and disadvantages of controling secondary flow in stationary blades, flow separation and losses distribution regularities of the produced stage group.更多还原