模态转换对变循环发动机多维度耦合模型性能影响研究  

Effects of mode transition on multi-dimensional coupling model of variable cycle engine

作　　者：王承熙 周莉 张晓博[1,2] 王占学 WANG Chengxi;ZHOU Li;ZHANG Xiaobo;WANG Zhanxue(School of Power and Energy,Northwestern Polytechnical University,Xi’an 710129,China;Collaborative Innovation Center for Advanced Aero-Engine,Beijing 100191,China)

机构地区：[1]西北工业大学动力与能源学院,陕西西安710129 [2]先进航空发动机协同创新中心,北京100191

出　　处：《推进技术》2024年第9期14-26,共13页Journal of Propulsion Technology

基　　金：国家自然科学基金(52076180);陕西省杰出青年科学基金(2021JC-10);国家科技重大专项(J2019-Ⅱ-0015-0036);航空发动机及燃气轮机基础科学中心项目(P2022-B-Ⅰ-002-001,P2022-B-Ⅱ-010-001);中央高校基本科研业务费专项基金(2022-08)。

摘　　要：为研究模态转换过程中模态选择阀(Mode Select Valve,MSV)与发动机总体之间的耦合作用,以典型的双涵道变循环发动机(Variable Cycle Engine,VCE)作为研究对象,首先通过三维MSV模型的数值仿真,建立具有通用性的MSV高保真度特性图;随后在基于部件的发动机零维整机气动性能计算程序的基础上,将该高保真度特性图耦合进入发动机性能计算程序,建立了多维度耦合模型,研究模态转换过程中MSV对总体性能以及部件的耦合影响;并对比了多维度耦合模型和零维模型的计算结果。结果表明:相比零维模型,多维度耦合模型的推力最大时高出3.98%,单位推力耗油率高出0.79%;风扇压比最大时高出9.86%,风扇效率高出0.75%。这种差异的原因在于多维度耦合模型正确地评估了MSV在非线性工作段的节流损失,该损失向后传递并影响到前可变面积涵道引射器(Front Variable Area Bypass Injector,FVABI)的掺混总压损失,依靠参与求解共同工作方程组显著地减少了外涵的流量,使得涵道比迅速减小,在发动机部件共同工作规律的约束和影响下,引起发动机低压涡轮落压比增加和低压轴转速增加,发动机性能参数也随之发生变化。因此相较于零维模形,多维度耦合模型能够真实地反映出模态转换时MSV对VCE性能参数以及其他部件的影响。In order to study the coupling effect between mode select valve(MSV)and the overall engineduring mode transition,a typical dual ducts variable cycle engine(VCE)is studied.Firstly,a high-fidelity characteristic map of MSV is established by 3D numerical simulation of MSV model.Then,based on the componentbased zero-dimensional engine aerodynamic performances calculation program,the multi-dimensional model is established by coupling high-fidelity characteristic map into the performances calculation program to study the coupling effects of MSV on the overall performances and components during the mode transition.The results of the multi-dimensional model and the zero-dimensional model are compared.The results show that,compared to the zero-dimensional model,the maximum thrust of the multi-dimensional model is 3.98%higher,and specific fuel consumption(sfc)is 0.79%higher.The fan pressure ratio is 9.86%higher at the maximum,and fan efficiencyincreasing by 0.75%.The reason for this difference is that the multi-dimensional model correctly evaluates throttling loss of MSV in the nonlinear section,and that passes backward and affects the mixing total pressure loss infront variable area bypass injector(FVABI).Relying on participating in solving cooperation equations,pressure loss in FVABI significantly reduce the mass flow rate of fan duct.And under the constraint of the balance law of the engine,this makes bypass ratio decrease rapidly,and increase both of LPT’s pressure ratio and speed of low pressure spool,and then engine performances also change.Therefore,compared with the zero-dimensional model,the multi-dimensional model can truly reflect the influence of MSV on VCE performance and other components during the mode transition.

关 键 词：变循环发动机 模态选择阀 维度缩放 模态转换 多维度耦合模型 

分 类 号：V231.1[航空宇航科学与技术—航空宇航推进理论与工程]