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高温径流涡轮承受很高的热应力,新一代的陶瓷涡轮由于燃气初温高,以及材料固有的热脆性,使温度场、热应力的研究在陶瓷涡轮的设计中更占有重要的地位。本文用三维有限元法分析了陶瓷和金属材料的径流涡轮温度场。为了确定热传导边界条件,作者用准正交面流线曲率法确定势流流场,接着用边界层能量积分方程计算了叶轮壁面的放热系数,从而建立了一个从径流涡轮流动计算到温度场分析的软件包。计算结果表明,温度梯度的最大值出现在近叶片根部。此外,气流出口处的轮毂部分温度梯度也较大。这些地方将是应力集中区。
Due to the high initial gas temperature and the inherent thermal brittleness of the new generation of ceramic turbines, the research on temperature field and thermal stress occupies an important position in the design of ceramic turbines. In this paper, the three-dimensional finite element method is used to analyze the temperature field of run-off turbine for ceramic and metal materials. In order to determine the thermal conduction boundary conditions, the author determines the potential flow field by quasi-orthogonal surface cows curvature method, and then calculates the exothermic coefficient of the impeller wall surface by using the energy equation of the boundary layer. Thus, a flow field from the runoff turbine to the temperature field Analysis of the package. The calculation results show that the maximum temperature gradient appears near the root of the blade. In addition, the temperature gradient at the hub portion at the air outlet is also large. These places will be stress concentration areas.