考虑部件约束的涡扇发动机循环参数分析方法研究

A Method for Analyzing Cycle Parameters of Turbofan Engine with Component Constraints

关键词:  涡扇发动机  总体设计  循环参数  数学建模  牛顿迭代法  耦合计算

Key words:  Turbofan engine  Integration design  Cycle parameters  Mathematical modeling  Newton iteration method  Coupling calculation

摘要:

在涡扇发动机初步设计阶段，为了研究部件气动、结构、强度参数对于发动机循环参数求解域的约束，在发动机总体性能稳态计算模型以及尺寸流路计算模型的基础上，利用部件初步设计时采用的Smith图，基于牛顿迭代法构建了一种总体/部件耦合计算方法。在部件主要设计参数的约束边界基础上，采用该方法，能够获取同时满足总体和部件设计要求的循环参数求解域，并进一步获得部件的主要设计参数。使用该方法对第四代双轴混排涡扇发动机EJ200开展了算例验证，获取了部件约束条件下的发动机循环参数求解域，与公布的EJ200数据对比表明，主要部件设计参数误差<4%，表明该方法可以满足工程应用要求。

Abstract:

In order to research the constraints of aerodynamics/configuration/strength parameters of components on the cycle parameters solution domain in the preliminary design stage of turbofan engine， an overall/components coupling design method， using Newton iteration method and Smith chart， which is based on the performance model and the size-flow model， has been proposed. On the basis of the constraint boundary of the main components’ design parameters， the method can get cycle parameters solution domain which satisfies both of the overall and components design requires. The 4th generation mixed-flow two-spool turbofan engine EJ200 is evaluated by the method. The solution domain， which satisfies the constraints of components design， is obtained by using modified method. Compared with the published data of EJ200 engine，the diviation of main component design parameters is less than 4.0%. The results show that the method is practical and meets the needs of engineering applications.