Numerical simulation of heat soak phenomenon of a civil high-bypass-ratio turbofan engine after shutdown
-
摘要:
针对航空发动机停机后气流流动与零件传热的耦合问题，提出了基于CFX的流动与传热异步长加速算法的耦合仿真策略，并研究了某型大涵道比航空发动机停机后的热沉浸现象。分析了零件在自然冷却条件下20 h的瞬态温度变化特性，仿真结果表明加速算法对于大模型流热耦合仿真具有良好的加速计算效果；机匣等位置在停机后周向温度不均匀性呈现先扩大后缓慢减小变化趋势；转盘盘底、支点轴承等难以散热的位置由热沉浸产生的温升明显；冷吹及盘车措施对于缓解周向不均匀性、降低热沉浸尖峰温度有一定效果。
Abstract:The coupling simulation method of flow and transient heat transfer with asynchronous steps was studied. CFX was used to simulate the flow and temperature distribution during 20 h after engine shut-down by using a civil high-bypass-ratio turbofan engine model. Result showed asynchronous steps ac-celeration method provided great accuracy and simulation cost. After shutdown, the circumferential temperature difference increased first under the influence of natural convection, and then decreased gradually. The temperature rise of positions like rotor disc bottom and bearing was significant because of heat soak back. To a certain extent, blowing cold air and barring gear was efficient in reducing non-uniformity of circumferential temperature and peak temperature in shut-down process.
-
Key words:
- heat soak /
- whole engine /
- flow and heat transfer /
- peak temperature /
- non-uniformity of temperature
-
图 4 瞬态加速算法原理示意图
Figure 4. Schematic diagram of principle of transient acceleration algorithm
图 7 停机2.6 h无量纲温度场
Figure 7. Dimensionless temperature distribution at 2.6 h after shut-down
图 8 停机2.6 h局部速度场
Figure 8. Topo-location velocity distribution at 2.6 h after shut-down
图 10 压气机盘底热沉浸温升
Figure 10. Temperature rise of compressor disc bottom due to heat soak
图 13 压气机机匣及7级转子无量纲温度周向分布
Figure 13. Dimensionless circumferential temperature distribution of compressor case and 7-stage rotor
图 14 低压涡轮机匣及7级转子无量纲温度周向分布
Figure 14. Dimensionless circumferential temperature distribution of low pressure turbine case and 7-stage rotor
图 15 机匣监测点最大周向温差
Figure 15. Maximum circumferential temperature difference at case monitor points
图 16 热响应不协调位置示意图
Figure 16. Schematic diagram of risky uneven thermal response locations
图 18 冷吹与自然冷却措施下的轴承外壁温度
Figure 18. Dimensionless temperature of bearing outer surface under cold blowing and natural cooling
图 19 转动与自然冷却措施下的轴承外壁温度
Figure 19. Dimensionless temperature of bearing outer surface under barring gear and natural cooling
表 1 停机各级盘热沉浸温升相对值
Table 1. Relative temperature rise of each disc bottom after shut-down
位置 ΔTp/% 位置 ΔTp/% 2级盘盘底 10.8 7级盘盘底 13.2 3级盘盘底 13.3 8级盘盘底 2.2 4级盘盘底 13.5 9级盘盘底 4.4 5级盘盘底 12.1 10级盘盘底 6.1 6级盘盘底 16.5 CDP盘盘底 7.3 
下载: 导出CSV
表 2 停车后机匣周向瞬态温差最大值
Table 2. Maximum circumferential temperature difference of case since shut-down
位置 瞬态最大温差/% TCASE1 7.50 TCASE3 7.20 TCASE5 10.8 TCASE7 24.0 TCASE10 21.7
下载: 导出CSV
表 3 冷吹条件下机匣周向温差不均匀性改善情况
Table 3. Improvement of unevenness of case circumferential temperature difference under cold air blowing
位置 ΔT/% 位置 ΔT/% T1 31 T6 19 T2 5 T7 42 T3 25 T8 40 T4 15 T9 23 T5 49 T10 26
下载: 导出CSV
表 4 冷吹措施下热沉浸尖峰温度改善情况
Table 4. Improvement of peak temperature due to heat soak under cold air blowing
位置 尖峰温度降低/% 位置 尖峰温度降低/% 2级盘 28 7级盘 80 3级盘 50 8级盘 300 4级盘 68 9级盘 147 5级盘 71 10级盘 96 6级盘 65 CDP盘 47
下载: 导出CSV
表 5 盘车措施下转子周向不均匀性改善情况
Table 5. Improvement of the unevenness of rotor circumferential temperature under barring gear
位置 ΔT/% TR1 −45 TR2 −41 TR3 −14 TR4 23 TR5 29 TR6 14
下载: 导出CSV
-
[1] 孙源,王东昌,冯宜语. 复杂涡轮盘腔流热固耦合特性数值仿真研究[J]. 装备制造技术,2023(7): 58-61,111. SUN Yuan,WANG Dongchang,FENG Yiyu. Numerical simulation study on thermal-solid coupling characteristics of complex turbine disk cavity flow[J]. Equipment Manufacturing Technology,2023(7): 58-61,111. (in Chinese doi: 10.3969/j.issn.1672-545X.2023.07.014SUN Yuan, WANG Dongchang, FENG Yiyu. Numerical simulation study on thermal-solid coupling characteristics of complex turbine disk cavity flow[J]. Equipment Manufacturing Technology, 2023(7): 58-61, 111. (in Chinese) doi: 10.3969/j.issn.1672-545X.2023.07.014 [2] 肖娜,刘康. 航空发动机加温瞬态传热数值仿真计算与试验[J]. 中国科技信息,2022(1): 38-40. XIAO Na,LIU Kang. Numerical simulation calculation and experiment of transient heat transfer in aero-engine heating[J]. China Science and Technology Information,2022(1): 38-40. (in Chinese doi: 10.3969/j.issn.1001-8972.2022.01.009XIAO Na, LIU Kang. Numerical simulation calculation and experiment of transient heat transfer in aero-engine heating[J]. China Science and Technology Information, 2022(1): 38-40. (in Chinese) doi: 10.3969/j.issn.1001-8972.2022.01.009 [3] 陈香,郜伟强,梁恩波等. 航空发动机热起动过程中转子热弯曲振动特性研究[J]. 燃气涡轮试验与研究,2021,34(4): 26-31,62. CHEN Xiang,GAO Weiqiang,LIANG Enbo,et al. Analysis on thermal bow vibration characteristic of aero-engine rotor during hot start[J]. Gas Turbine Experiment and Research,2021,34(4): 26-31,62. (in Chinese doi: 10.3969/j.issn.1672-2620.2021.04.005CHEN Xiang, GAO Weiqiang, LIANG Enbo, et al. Analysis on thermal bow vibration characteristic of aero-engine rotor during hot start[J]. Gas Turbine Experiment and Research, 2021, 34(4): 26-31, 62. (in Chinese) doi: 10.3969/j.issn.1672-2620.2021.04.005 [4] 佟轶杰,曲胜,刘国库. 航空发动机涡轮机匣传热分析技术研究[J]. 航空发动机,2012,38(2): 27-31. TONG Yijie,QU Sheng,LIU Guoku. Heat transfer analysis technology of aeroengine turbine casing[J]. Aeroengine,2012,38(2): 27-31. (in Chinese doi: 10.3969/j.issn.1672-3147.2012.02.008TONG Yijie, QU Sheng, LIU Guoku. Heat transfer analysis technology of aeroengine turbine casing[J]. Aeroengine, 2012, 38(2): 27-31. (in Chinese) doi: 10.3969/j.issn.1672-3147.2012.02.008 [5] LIAN Wenlei,JIANG Yunfei,CHEN Hao,et al. Heat transfer characteristics of an aeroengine turbine casing based on CFD and the surrogate model[J]. Energies,2022,15(18): 6743. doi: 10.3390/en15186743 [6] 刘钊,王敏,丰镇平. 燃气轮机透平转静盘腔内流动与传热研究进展[J]. 中国电动机工程学报,2024,44(8): 3137-3155. LIU Zhao,WANG Min,FENG Zhenping. Review of flow and heat transfer in rotor-stator disk cavity of gas turbine[J]. Proceedings of the CSEE,2024,44(8): 3137-3155. (in ChineseLIU Zhao, WANG Min, FENG Zhenping. Review of flow and heat transfer in rotor-stator disk cavity of gas turbine[J]. Proceedings of the CSEE, 2024, 44(8): 3137-3155. (in Chinese) [7] SUN Zixiang,CHEW J W,HILLS N J,et al. Efficient FEA/CFD thermal coupling for engineering applications[R]ASME Paper GT2008-50638,2008. [8] LIANG Dong,JIN Donghai,GUI Xingmin. Investigation of seal cavity leakage flow effect on multistage axial compressor aerodynamic performance with a circumferentially averaged method[J]. Applied Sciences,2021,11(9): 3937. doi: 10.3390/app11093937 [9] ILLINGWORTH J B,HILLS N J,BARNES C J. 3D fluid-solid heat transfer coupling of an aero engine pre-swirl system[R]. ASME Paper GT2005-68939,2005. [10] 李曙光,张科夫,王波. 某型航空发动机低压转子卡滞故障分析研究[J]. 航空维修与工程,2017(4): 93-96. LI Shuguang,ZHANG Kefu,WANG Bo. Failure analysis of low pressure rotor seizing up for a certain type of engine[J]. Aviation Maintenance & Engineering,2017(4): 93-96. (in Chinese doi: 10.3969/j.issn.1672-0989.2017.04.040LI Shuguang, ZHANG Kefu, WANG Bo. Failure analysis of low pressure rotor seizing up for a certain type of engine[J]. Aviation Maintenance & Engineering, 2017(4): 93-96. (in Chinese) doi: 10.3969/j.issn.1672-0989.2017.04.040 [11] 郭徽,尹洪举,马水全. 某型号涡轴发动机涡轮转子卡滞故障分析[J]. 直升机技术,2006(4): 51-53. GUO Hui,YIN Hongju,MA Shuiquan. Failure analysis of turbine rotor binding of a turbo shaft engine[J]. Helicopter Technique,2006(4): 51-53. (in ChineseGUO Hui, YIN Hongju, MA Shuiquan. Failure analysis of turbine rotor binding of a turbo shaft engine[J]. Helicopter Technique, 2006(4): 51-53. (in Chinese) [12] CHEN S,GU W,SUI D,et al. Natural cooling thermal analysis of the high pressure rotor of an aero-engine: a preliminary study[R]. Shanghai: Proceedings of Shanghai 2017 Global Power and Propulsion Forum,2017. [13] WEIDMANN E P,BINNER T,REISTER H. Experimental and numerical investigations of thermal soak[J]. SAE International Journal of Materials and Manufacturing,2008,1(1): 145-153. doi: 10.4271/2008-01-0396 [14] SAUNDERS K,ALIZADEH S,LEWIS L V,et al. The use of CFD to generate heat transfer boundary conditions for a rotor-stator cavity in a compressor drum thermal model[R]. ASME Paper GT2007-28333,2007. [15] KANIKE N,TALURU D,NELANTI K,et al. Thermal analysis of gas turbine bearing compartment during normal operation period[R]. ASME Paper GTINDIA2012-9620,2012. [16] SVENSDOTTER S,SKELTON L,INGLE J. Shutdown modelling to extend operation to extreme ambient conditions[R]. ASME Paper GT2007-28110,2007. [17] FADL M,HE L. On LES based conjugate heat transfer procedure for transient natural convection[R]. ASME Paper GT2017-63600,2017. [18] SHI Yu,DING Shuiting,QIU Tian,et al. Bi-Fo time scaling method in the numerical simulation of transient conjugate heat transfer[J]. Propulsion and Power Research,2021,10(3): 209-223. doi: 10.1016/j.jppr.2021.05.005 -
点击查看大图
计量
- 文章访问数: 1016
- HTML浏览量: 254
- PDF量: 79
- 被引次数: 0