Analysis of integrated thermal management performance of aero⁃engine accessories
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摘要:
针对航空发动机舱内附件面临的热问题，提出了以隔热、通油冷却、通风冷却等为热防护措施的综合热管理方案，通过实验研究了隔热、通油冷却、通风冷却对附件温度的影响，获得了机匣温度、初始燃油温度及燃油流量等对附件表面温度及进出口燃油温升的影响规律。结果表明：隔热能够显著降低附件表面温度增长速率，在100 min工作时间内能够有效控制附件表面温度保持在200 ℃以下；附件表面温度的主要影响因素为初始燃油温度、加热功率、燃油流量，其中初始燃油温度决定附件进口温度，加热功率、燃油流量决定附件进出口温差，三者共同决定附件表面温度；通风冷却对未采取通油冷却的附件有一定的冷却效果，对采取通油冷却的附件没有明显的冷却效果。
Abstract:In view of the thermal problems faced by the accessories in the aircraft engine cabin，a comprehensive thermal management scheme with heat insulation，oil cooling and ventilation cooling as thermal protection measures was put forward.Through tests，the effects of heat insulation，oil ventilation cooling and ventilation cooling on the temperature of the accessories were studied.The effects of casing temperature，initial fuel temperature and fuel flow rate on the surface temperature of the accessories and the temperature rise of inlet and outlet fuel were obtained.The results showed that the heat insulation can significantly reduce the growth rate of the surface temperature of the accessories，and the surface temperature of the accessories can be effectively controlled to keep below 200 ℃ within the working time of 100 min.The main factors affecting the surface temperature of the accessories consisted of initial fuel temperature，heating power and fuel flow.The initial fuel temperature determined the inlet temperature of the accessories，while the heating power and fuel flow determined the temperature difference between the inlet and outlet of the accessories.The three factors together determined the surface temperature of the accessories.Ventilation cooling had a certain cooling effect on the accessories not participating in oil cooling，but no obvious cooling effect on the accessories participating in oil cooling.
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Key words:
- accessory /
- integrated thermal management /
- thermal insulation /
- oil cooling /
- forced⁃air cooling
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图 6 附件硅酸铝隔热层加装示意图
Figure 6. Sketch of the installation of aluminum silicate of the accessories
图 7 附件安装位置及燃油管路示意图
Figure 7. Sketch of installation location and fuel pipeline of the accessories
图 9 发动机舱热环境温度分布图
Figure 9. Thermal environment temperature distribution of engine compartment
图 12 不同机匣温度下冲压舱油路沿程温度分布
Figure 12. Temperature distribution along the oil path of the stamping chamber at different casing temperatures
图 13 不同初始燃油温度下冲压舱油路沿程温度分布
Figure 13. Temperature distribution along the oil path of the stamping chamber at different initial fuel temperatures
图 14 不同燃油流量下冲压舱油路沿程温度分布
Figure 14. Temperature distribution along the oil path of the stamping chamber at different fuel mass flows
表 2 不同机匣温度下附件的表面温度
Table 2. Surface temperature of the accessories at different casing temperatures
冲压机匣温度/℃ 表面温度/℃ 冲压附件Ⅰ 冲压附件Ⅱ 227 122.4 134.4 327 122.6 135.1 427 131.1 135.6 
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表 3 不同初始燃油温度下附件的表面温度
Table 3. Surface temperature of the accessories at different initial fuel temperatures
初始油温/℃ 表面温度/℃ 冲压附件Ⅰ 冲压附件Ⅱ 93 97.5 111.5 120 131.1 135.0
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表 4 不同燃油流量下附件的表面温度
Table 4. Surface temperature of fuel pump at different fuel mass flows
燃油流量 表面温度/℃ 冲压附件Ⅰ 冲压附件Ⅱ qm 128.8 155.4 3.5qm 128.6 142.0
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