涡扇发动机主燃油系统低频脉动问题分析

孙昊博; 李凌汉; 刘晓峰

doi:10.13224/j.cnki.jasp.20220660

涡扇发动机主燃油系统低频脉动问题分析

doi: 10.13224/j.cnki.jasp.20220660

中国航发沈阳发动机研究所，沈阳 110015

详细信息

作者简介:
孙昊博（1993-），男，工程师，硕士，主要从事航空发动机控制系统研究

中图分类号: V231.1
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- 文章访问数: 6
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- 被引次数: 0
出版历程
- 收稿日期: 2022-09-06
- 网络出版日期: 2024-05-24

Analysis of low frequency pulsation of main fuel system on turbofan engine

Shenyang Engine Research Institute，Aero Engine Corporation of China，Shenyang 110015，China

摘要

摘要:
针对某型涡扇发动机主燃油系统中存在低频脉动，影响发动机工作安全性的问题，对燃油流路中低频脉动的产生机理进行分析，明确低频脉动的影响因素，从脉动的影响因素出发，结合主燃油系统的工作原理和相关附件、管路装配关系，定位系统中低频脉动大的原因，并提出一种通过调整活门型孔尺寸抑制低频脉动的改进措施。改进后的活门随发动机开展整机试验验证，试验结果均表明，改进措施合理有效，对低频脉动的抑制效果显著，随着发动机的工作状态点和脉动基准值的变化，脉动幅值可降低5%～84%，大幅提升了发动机主燃油系统的工作可靠性，保证了发动机试车安全。
- 涡扇发动机 /
- 主燃油系统 /
- 低频脉动 /
- 活门型孔 /
- 等增益比
Abstract:
Aiming at the problem of low-frequency pulsation in the main fuel system of turbofan engine, which affects the safety of the engine, the mechanism of low-frequency pulsation in the fuel system is analyzed, and the influence factors of low-frequency pulsation are clarified. Starting from the influence factors of pulsation, combined with the working principle of the main fuel system and the relationship between related accessories and pipeline assembly, the reason for the large low-frequency pulsation in the system is located, and an improvement method to suppress the low-frequency pulsation by adjusting the size of the valve type orifice is proposed. The improved valve is verified with a turbofan engine. The test results show that the improvement method are reasonable and effective, and the pulsation amplitude can be reduced by 5% to 84%, greatly improving the working reliability of the engine's main fuel system and ensuring the safety of the engine.
- turbofan engine /
- main fuel system /
- low frequency pulsation /
- valve type orifice /
- equal gain ratio

HTML

图 1 主燃油系统工作原理图

Figure 1. Working principle diagram of main fuel system

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图 2 改进前活门型孔结构示意图

Figure 2. Schematic diagram of the improved valve type orifice before improvement

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图 3 型孔开度与打开面积对应关系

Figure 3. Corresponding relationship between the opening of orifice and opening area

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图 4 改进后活门型孔结构示意图

Figure 4. Schematic diagram of the improved valve type orifice after improvement

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图 5 主燃油泵后脉动幅值对比1

Figure 5. Comparison of pulsation amplitude after main fuel pump 1

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图 6 增压阀后脉动幅值对比1

Figure 6. Comparison of pulsation amplitude after booster valve 1

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图 7 主燃油泵后脉动幅值对比2

Figure 7. Comparison of pulsation amplitude after main fuel pump 2

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图 8 增压阀后脉动幅值对比2

Figure 8. Comparison of pulsation amplitude after booster valve 2

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表 1 型孔打开面积对比

Table 1. Comparison of orifice opening area

型孔开度/mm 打开面积/mm²

改进前改进后

0 0 0

1 0.9 0.9

2 1.8 1.8

3 2.8 2.7

4 4.2 4

5 10.5 6.6

6 25.9 11.9

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