Integrated performance evaluation method for variable cycle engine compression system considering influence of complex bypass
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摘要:
基于双外涵变循环发动机压缩系统,分析了多连通气动布局变循环压缩系统的匹配工作机制。一体化全三维数值模拟表明:变循环压缩系统各压缩部件与涵道及其调节机构之间由于多连通特征相对于常规发动机压缩系统具有更强的耦合工作特点,高效的外涵道流动是发挥变循环发动机性能优势的关键。涵道几何的调节不仅会改变其自身流动状态,还伴随着压缩部件气动性能的偏移,模式转换过程必须符合各涵道及调节机构之间的气动协调匹配。提出了适用于多连通变循环压缩系统的一体化变维度分析方法,将部件通流程序与涵道零维程序相结合,实现了部件-涵道耦合匹配关系的快速分析。基于变维度分析方法给出了单外涵模式部件与涵道共同约束下的压缩系统综合匹配可行域,旨在为变循环发动机的匹配设计提供理论依据。
Abstract:The matching of the double bypass engine compression system was investigated to reveal the operating mechanism of the multi-connected compression system of the variable cycle engine. Three-dimensional numerical simulation showed that there was a strong coupling between the compression components, the bypass ducts, and the bypass regulation mechanisms. A well-organized bypass flow was a key for the variable cycle engine to exhibit its aerodynamic advantage. The adjustment of the bypass regulation mechanism not only changed the flow state of the bypass but also influenced the matching state of the compression components, hence the mode transition required for the cooperation of all components. To realize fast matching analysis of the multi-connected compression system, an integrated variable-dimensional analysis method for variable cycle compression system was proposed by combining the component through flow program with the zero-dimensional bypass program. The feasible region of the compression system for the single bypass mode was deduced based on the variable-dimensional analysis method, thus providing the theoretical basis for the matching design of variable cycle engines.
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Key words:
- variable cycle engine /
- compression system /
- complex bypass /
- coupling work /
- matching
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表 1 涵道流路的影响计算方案 (单外涵)
Table 1. Calculation scheme to investigate the influence of bypass flow path (single bypass)
参数 数值 低压轴相对物理转速nlow 1.0 高压轴相对物理转速nhigh 1.0 CDFS进口导叶开度αVIGV/(°) 0 AFVABI 0.43 内涵相对出口背压pinner 1.0 外涵道相对出口背压pouter 0.78~1.33 表 2 涵道流路的影响计算方案 (双外涵)
Table 2. Calculation scheme to investigate the influence of bypass flow path (double bypass)
参数 数值 低压轴相对物理转速nlow 1.0 高压轴相对物理转速nhigh 0.96 CDFS进口导叶开度αVIGV/(°) 40 AFVABI 0.43 内涵相对出口背压pinner 1.0 外涵道相对出口背压pouter 0.83~1.23 表 3 压缩系统模式转换过程计算方案设置
Table 3. Calculation scheme setting to investigate the mode transition process of compression system
方案 AMSV AFVABI pinner pouter nlow nhigh 工况 1 0 0.43 1.0 1.0 1.0 1.0 工况2 0.09 工况3 0.17 工况4 0.26 工况5 0.35 工况6 0.43 表 4 FVABI开度调节方案参数设置
Table 4. Parameter setting of calculation scheme to investigate the opening condition of the FVABI
方案 AMSV AFVABI pouter pinner nlow nhigh 工况1 0.35 0.43 1.0 1.0 1.0 1.0 工况2 0.38 工况3 0.33 工况4 0.28 -
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