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为改善压气机过渡段内的流动损失,提高设计过程的快速性和结果的准确性。首先,发展了结合气动评估与优化算法的带支板压气机过渡段的设计方法,并编制了相应程序。针对算法各自的特点将不同的气动评估方法运用到优化方法的不同阶段,求解子午平面的二维方法用于解空间的全局寻优,精确求解三维雷诺平均Navier-Stokes(RANS)方程的方法用于进行局部寻优,这使得设计流程变得快速而不失准确性,并建立了方便进行流通面积控制的过渡段参数化方法。其次,针对一算例开展了设计工作,并分析了损失来源,结果表明过渡段的设计如果不考虑支板的影响将对结果产生重大偏差;对于进出口面积相同的过渡段设计,沿流动方向先增大后减小的面积变化有助于减小过渡段支板后半段的局部快速扩压作用与凹壁面减速作用相互叠加引起的高损失区域,避免大的流动分离;过渡段流通面积扩张度有一个最佳值,其值受支板翼型、进出口面积比等因素共同影响。最后,将本文设计方法得到的过渡段规律同前人所做类似工作得到的结论进行对比,吻合较好,说明本文发展的设计方法是可行的。
To improve flow losses in the compressor transitional section and to improve the speed of the design process and the accuracy of the results. First of all, the design method of transition zone with support plate compressor combining with aerodynamic evaluation and optimization algorithm was developed and corresponding procedures were developed. According to the characteristics of each algorithm, different aerodynamic evaluation methods are applied to different stages of the optimization method. The method of solving radial Navier-Stokes (RANS) equations using the two-dimensional method of meridian plane is proposed. In the local optimization, which makes the design process quickly and without losing accuracy, and the establishment of a convenient flow area control of the transition section parameterization method. Second, design work is carried out on a case study, and the sources of losses are analyzed. The results show that the design of the transition section will have a significant deviation from the result if the design of the transition section is not considered. For the transition section design with the same import and export area, First increase and then reduce the area change helps to reduce the transition section of the latter half of the local rapid expansion and the role of the concave wall deceleration caused by the superposition of the high losses of the region to avoid large flow separation; transitional section flow area Expansion degree has an optimum value, the value of the support by the airfoil, import and export area ratio and other factors together. Finally, comparing the law of the transition section obtained by the design method with the conclusion obtained by similar work done by the predecessors shows that the design method developed in this paper is feasible.