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为了实现变循环涡扇发动机压缩系统的快速一体化气动设计,研究了变循环特征部件在一体化通流计算中的实现途径,针对其中的关键部件前可调面积涵道引射器(前VABI),结合其工作机理和流线曲率法通流计算方法的特点,提出了一种通流模拟的思路,发展了不同应用条件下的计算方法,并基于汇流环管流动模型对计算方法的合理性和准确性进行了校验。计算结果显示,在不发生流动堵塞的情况下,前VABI的轴向调节和俯仰调节方式对变循环压缩系统中第一、二外涵道匹配工作特性的影响较小,匹配流量的最大误差小于0.2%,在计算中采用俯仰调节可以准确地模拟轴向调节时的真实特性。在通流计算中,当第一外涵道气流总压高于第二外涵道较多(核心机驱动风扇级增压比大)时,前VABI尾缘的通流计算站应该合理设置,以避免计算模型对流通能力的附加限制。前VABI的通流计算方法对第一、二外涵道流量匹配特性的计算误差小于1%(与CFD结果相比),能够满足变循环压缩系统初始方案设计的需求。
In order to achieve a rapid and integrated aerodynamic design of a variable cycle turbofan engine compression system, the ways of realizing variable circulation characteristics in the integrated through-flow calculation are studied. For the former adjustable-area bypass injector (former VABI ), Combined with its working mechanism and the characteristics of flow-through curvature calculation method, a new idea of flow-through simulation is proposed and the calculation method under different application conditions is developed. Based on the flow model of convergent flow-pipe, the calculation method is reasonable Sexuality and accuracy were checked. The calculation results show that the axial and pitch adjustment modes of the former VABI have little effect on the first and second outer ducts matching performance in a variable cycle compression system, and the maximum error of the matching flow is less than 0.2%, in the calculation of the use of pitch adjustment can accurately simulate the axial adjustment of the real characteristics. In the flow calculation, when the total pressure of the first outer bypass airflow is higher than that of the second outer bypass (the core machine drives the fan-stage turbocharging ratio), the through-flow calculation station of the front VABI trailing edge should be set reasonably, To avoid calculating the model of the additional restrictions on the ability to flow. For the first VABI calculation method, the calculation error of the first and second outer bypass flow matching characteristics is less than 1% (compared with CFD results), which can meet the requirements of the initial scheme design of variable cycle compression system.