| 分开排气涡扇发动机的热力循环分析 |
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| 引用本文： | 杨锟,屠秋野,施洋,蔡元虎,蒋平.分开排气涡扇发动机的热力循环分析[J].航空动力学报,2017,32(9):2187-2192. |
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| 作者姓名： | 杨锟 屠秋野 施洋 蔡元虎 蒋平 |
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| 作者单位： | 1.西北工业大学 动力与能源学院，西安 710072；先进航空发动机协同创新中心，北京 100191 |
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| 摘 要： | 基于燃气发生器的概念分析了分开排气涡扇发动机的效率划分。在此基础上，通过理论推导证明了分开排气涡扇发动机的最佳外涵风扇增压比的存在判据，及其单位推力、效率和耗油率极值的等价性。给出的判据可以作为实际分排涡扇发动机设计中的最佳外涵风扇增压比的选择依据。针对两型大涵道比分开排气涡扇发动机热力循环分析的结果表明:当外内涵排气速度的比值与风扇、低压涡轮效率的乘积相等时，发动机的总效率和单位推力最大，耗油率最低，从而证明了本文给出的效率划分和最佳外涵风扇增压比判据是合理的。
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| 关 键 词： | 大涵道比分开排气涡扇发动机 燃气发生器 效率 最佳外涵风扇增压比 耗油率 |
| 收稿时间： | 2016/1/19 0:00:00 |
Analysis of thermodynamic cycle for separated flow turbofan engine |
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| YANG Kun,TU Qiuye,SHI Yang,CAI Yuanhu,JIANG Ping.Analysis of thermodynamic cycle for separated flow turbofan engine[J].Journal of Aerospace Power,2017,32(9):2187-2192. |
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| Authors: | YANG Kun TU Qiuye SHI Yang CAI Yuanhu JIANG Ping |
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| Abstract: | The efficiency of separated flow turbofan engine was analyzed based on the definition of gas generator. It proved the existence criterion of the optimum fan pressure ratio and the equivalence of extreme value of the specific thrust, the total efficiency and the specific fuel consumption by theoretical deduction on the basis of the efficiency definitions. This criterion could be used to determine the optimum fan pressure ratio for separated flow turbofan engine in practical design progress. The parametric study results of two different high bypass ratio separated flow turbofan engines demonstrated that when the ratio of bypass and primary exhaust velocity equaled to the product of fan and low pressure turbine efficiencies, the overall efficiency and specific thrust reached their maximums and specific fuel consumption reached its minimum, proving the validity of the criterion. |
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| Keywords: | high bypass ratio separated flow turbofan engine gas generator efficiency optimum bypass fan pressure ratio specific fuel consumption |
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