涡轴发动机超转保护系统燃油切断时序研究

李立新; 殷泽天; 向露宇; 刘阳; 刘志

doi:10.13224/j.cnki.jasp.20240796

涡轴发动机超转保护系统燃油切断时序研究

doi: 10.13224/j.cnki.jasp.20240796

李立新^{1, 2},
殷泽天^2,*, ,,
向露宇²,
刘阳²,
刘志²

1.
西北工业大学动力与能源学院，西安 710129
2.
中国航发湖南动力机械研究所，湖南株洲 412002

详细信息

作者简介:
李立新（1981-），男，研究员，博士，主要从事航空发动机总体结构设计

通讯作者:
殷泽天（1994-），男，工程师，硕士，主要从事航空发动机总体性能设计。E-mail：thzb111@qq.com

中图分类号: V231.1
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- 被引次数: 0
出版历程
- 收稿日期: 2024-11-22
- 网络出版日期: 2026-06-23

Research on fuel cut-off sequence of overspeed protection system for turboshaft engines

Li Lixin^{1, 2},
Yin Zetian^{2,*
, ,},
Xiang Luyu²,
Liu Yang²,
Liu Zhi²

1.
School of Power and Energy，Northwestern Polytechnical University，Xi’an 710129，China
2.
Hunan Aviation Powerplant Research Institute，Aero Engine Corporation of China，Zhuzhou Hunan 412002，China

摘要

摘要:
为评估涡轴发动机动力涡轮超转保护装置的安全性，在某型涡轴发动机上进行了规定状态下的模拟超转试验，获得了发动机超转燃油衰减规律；进一步提出了一种动力涡轮失去负载后最大转速预测方法，根据燃油规律与输出功率、气动转矩、动力涡轮转速与加速度的关系，采用分段迭代计算的方式对超转过程不同时刻的动力涡轮转速进行计算，获得了动力涡轮断轴最大转速；最后，对配装不同燃油切断时序的超转保护装置的断轴后最高转速进行了差异分析，结果表明断油过程的压力平稳区时长对动力涡轮最大转速有决定性作用，将燃油切断时间从65 ms调整至181 ms后，最大动力涡轮转速从116.1%上升至123.2%，为保证涡轮失去负载后的安全性，宜将燃油切断时间控制在162 ms以内。
- 涡轴发动机 /
- 失去负载 /
- 超转保护 /
- 切断时间 /
- 最大转速
Abstract:
For evaluating the safety of Turboshaft engine power turbine over-speed protective device, the simulation test for over-speed was carried out on a specific type of Turboshaft engine under prescribed conditions and the fuel decay law of engine over-speed was obtained. Furthermore, a method for predicting maximum rotor speed after losing load was proposed. According to the relationship between the fuel flow decay law and output power, pneumatic torque, power turbine speed and acceleration, the power turbine speed at different moments during over-speed process was calculated by using sectional iterative calculation method. The maximum power turbine speed when shaft fracture occurs was obtained. Finally, a difference analysis was conducted on the highest speed post-shaft breakage of the over-speed protection devices equipped with different fuel cutoff timings. The results indicate that the duration of the stable decline phase during the fuel cutoff process plays a decisive role in the maximum speed of the power turbine speed of the power turbine. After adjusting the fuel cutoff time from 65 ms to 185 ms, the maximum power turbine speed rosed from 116.1% to 123.2%. To ensure the safety of the turbine after losing load, it is advisable to control the fuel cutoff time within 162 ms.
- turboshaft engine /
- loss of load /
- over-speed protection /
- timing of cutoff /
- maximum speed

HTML

图 1 超转保护机械原理图

Figure 1. Over-speed protection mechanism diagram

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图 2 燃油分配装置与试车台测量系统电路图

Figure 2. Fuel distribution device and circuit diagram of measuring system for test bench

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图 3 超转放油过程p_fz、p_ff、p_s3随时间的变化规律

Figure 3. Variation rule of p_fz, p_ff, p_s3 with time during over-speed fuel cutoff

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图 4 超转试验N_p转速与时间的关系

Figure 4. Relationship between the N_p and time of overs-peed test

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图 5 分配装置A燃油衰减规律采集与计算结果

Figure 5. Collection and calculation results of the fuel decay law for fuel distribution device A

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图 6 分配装置B燃油衰减规律采集与计算结果

Figure 6. Collection and calculation results of the fuel decay law for fuel distribution device B

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图 7 不同燃油分配装置的油路压力

Figure 7. Fuel pressure of different fuel distribution devices

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图 8 超转过程等效功率与时间的关系

Figure 8. Relationship between equivalent power and time during the over-speed process

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图 9 超转过程转矩与时间的关系

Figure 9. Torque-time relationship during overspeed

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图 10 不同燃油分配装置的最大N_p转速

Figure 10. Maximum N_p when equipped with different distribution devices

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图 11 燃油分配装置断油过程

Figure 11. Fuel cutoff process of the fuel distribution device

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