| 朱颜霞，周 淼，王雄辉，阙建锋.基于压差法和流量平衡法的火焰筒进气量
测量对比分析[J].航空发动机,2025,51(2):150-157 |
| 基于压差法和流量平衡法的火焰筒进气量
测量对比分析 |
| Comparative Analysis of Flame Tube Inlet Air Flow Rate Measurement Based on Differential-PressureMethod and Flow Balance Method |
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| DOI： |
| 中文关键词: 民用涡扇发动机 燃烧室 火焰筒进气量 不确定度 流量平衡法 压差法 流量分配 |
| 英文关键词:civil turbofan engine combustion chamber flame tube inlet air flow rate uncertainty flow balance method differential-
pressure method flow distribution |
| 基金项目:航空动力基础研究项目资助 |
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| 摘要点击次数: 481 |
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| 中文摘要: |
| 在民用涡扇发动机试车过程中为了准确测量燃烧室火焰筒进气量（即参与燃烧的空气流量），以大涵道比涡扇发动机核
心机的试车结果为例，分别从不确定度、二次流分配、模型匹配及火焰筒壁温分布等角度开展了压差法和流量平衡法的对比分析。
结果表明：针对环形燃烧室的火焰筒进气量，流量平衡法的不确定度比压差法的小73.8%；压差法对火焰筒头部进口静压的敏感
性较大，而流量平衡法的不确定度很大程度上取决于压气机进口流量W 25 ；利用压差法和流量平衡法的测量结果分别进行模型匹
配，流量平衡法得到的涡轮第1级导叶换算流量与流函数的结果一致，而压差法与流函数的结果差9.94%；引入燃烧室出口静压
P s4 修正火焰筒内压力后，压差法火焰筒进气量和流量平衡法的结果差异从14.18%减小至9.03%。在涡扇发动机试车过程中流量
平衡法更适用于描述燃烧室火焰筒进气量。 |
| 英文摘要: |
| In the testing process of civil turbofan engines, to accurately measure the combustion chamber flame tube inlet air flow
rate (i.e., the air mass flow participating in combustion), a comparative analysis of the differential-pressure method and the flow balance
method was conducted based on the core engine test results of a high-bypass-ratio turbofan engine, considering the uncertainty, secondary
flow distribution, model matching, and wall temperature distribution of the flame tube. The results show that for the flame tube inlet air flow
rate of the annular combustion chamber, the uncertainty of the flow balance method is 73.8% lower than that of the differential-pressure
method; the measurement results of the differential-pressure method are highly sensitive to the inlet static pressure of the flame tube dome,
the uncertainty of the flow balance method depends largely on the compressor inlet flow rate W25; using the measurement results of the
differential-pressure method and the flow balance method for engine performance model matching respectively, the referred flow rate of the
first-stage turbine guide vane obtained by the flow balance method is consistent with the result of the flow function test, while the result of
the differential-pressure method differs from that of the flow function by 9.94%; after introducing the static pressure Ps4 at the outlet of the
combustion chamber to correct the pressure inside the flame tube, the difference in the results of the flame tube inlet air flow rate using the
differential-pressure method and the flow balance method is reduced from 14.18% to 9.03%. Therefore, the flow balance method is more
suitable for describing the flame tube inlet air flow rate during turbofan engine testing. |
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