变外涵工况下风扇增压级双涵匹配机理

郑覃; 杨小贺; 叶俊; 冯锦璋

doi:10.13224/j.cnki.jasp.20210112

变外涵工况下风扇增压级双涵匹配机理

doi: 10.13224/j.cnki.jasp.20210112

中国航发商用航空发动机有限责任公司，上海 200241

详细信息

作者简介:
郑覃（1992-），男，博士，主要从事民机风扇增压级气动设计研究。

中图分类号: V231.3
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- 被引次数: 0
出版历程
- 收稿日期: 2021-03-12
- 网络出版日期: 2022-10-14

Twin⁃duct matching mechanism in fan booster under different bypass working conditions

Commercial Aircraft Engine Company Limited，Aero Engine Corporation of China，Shanghai 200241，China

摘要

摘要:
针对某型民机大涵道比风扇增压级，在不同外涵工况下开展数值计算，旨在研究风扇增压级双涵性能匹配规律和相应机理。通过分析计算结果，掌握了外涵工况对内涵特性的影响规律：当外涵工况从近堵点移向近喘点的过程中，内涵的流量、总压比、效率逐渐增大，且内涵稳定裕度呈持续增大的变化规律。同时也在获取内涵特性时，掌握了外涵气动性能的变化规律，在不同外涵工况下阐明了内涵逼喘过程中双涵气动性能的相互匹配机理取决于风扇的总压比‑流量特性和内外涵流量再分配机制的共同作用。
- 民用航空发动机 /
- 风扇增压级 /
- 大涵道比 /
- 双涵匹配机理 /
- 流量再分配
Abstract:
Numerical research on a high‑bypass‑ratio fan booster of a civil‑aircraft engine was conducted under different bypass working conditions，with the aim of understanding the twin‑duct matching rule and corresponding matching mechanism.By analysis of the numerical results，it was understood that as the bypass working condition changed from the near choke point to the near surge point，the mass flow，pressure ratio and efficiency increased and the core surge margin first climbed up and then declined.In the process of acquiring core characteristics，the change law of bypass aerodynamic performance was mastered.Furthermore，during the forced surge process of the core，the twin‑duct matching mechanism was subject to the combined actions of the fan characteristic of pressure ratio and mass flow and the redistribution of mass flow between the core and bypass.
- civil⁃aircraft engine /
- fan booster /
- high⁃bypass⁃ratio /
- twin⁃duct matching mechanism /
- mass flow redistribution
注释:

1) 张雪

HTML

图 1 计算模型图示

Figure 1. Diagram of the calculation model

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图 2 风扇B2B平面网格设置

Figure 2. Fan blade B2B mesh topology

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图 3 分流环网格设置

Figure 3. Mesh topology near the splitter

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图 6 内涵近喘点风扇叶片吸力面极限流线

Figure 6. Suction surface streamlines on fan blades under the near surge condition of the core

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图 7 内涵近喘点外涵出口导叶吸力面极限流线

Figure 7. Suction surface streamlines on bypass outlet guide vanes under the near surge condition of the core

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图 9 风扇95%叶高Ma_rel分布（外涵：中间点）

Figure 9. Contours of Ma_rel at 95% fan blade span （bypass:middle point）

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图 10 风扇95%叶高Ma_rel分布（外涵：工作点）

Figure 10. Contours of Ma_rel at 95% fan blade span （bypass:operation point）

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图 14 无量纲内涵裕度和 $|Δ {\dot{m}}_{f} / Δ {\dot{m}}_{c}|$ 随外涵流量变化曲线

Figure 14. Variation of normalized core surge margin and $|Δ {\dot{m}}_{f} / Δ {\dot{m}}_{c}|$ with bypass mass flow

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图 15 分流环相对马赫数云图（外涵：中间点）

Figure 15. Relative Mach number contours near the splitter （bypass:middle point）

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图 16 分流环相对马赫数云图（外涵：工作点）

Figure 16. Relative Mach number contours near the splitter （bypass:operation point）

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图 17 分流环相对马赫数云图（外涵：近堵点）

Figure 17. Relative Mach number contours near the splitter （bypass:near choke point）

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表 1 各工况分隔线位置及内涵逼喘过程的流量变化

Table 1. Locations of dividing lines and variations in mass flow during the forced surge process of the core under different working conditions

外涵工况		中间点	工作点	近堵点
内外涵分隔线相对位置/%	内涵工作点	17.86	16.45	15.35
内外涵分隔线相对位置/%	内涵近喘点	16.94	15.08	14.71
额外流向外涵流量/%		0.56	0.81	0.41
内涵流量相对变化量/%		-1.15	-1.43	-0.52
外涵流量相对变化量/%		-3.16	0.31	0.48
风扇流量相对变化量/%		-4.31	-1.12	-0.04

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