北航土著，中国航空发动机事业忠实粉丝，现为北京航空航天大学航空发动机研究院副研究员，从事航空发动机气动声学、进气畸变和压气机流动稳定性控制研究。近五年主持国家自然科学基金项目1项、某国际合作项目1项、博士后青年基金项目1项、先进航空动力创新工作站项目1项、某重点实验室项目1项，参与某重点基础研究项目2项、国家自然科学基金项目2项等。发表学术论文30余篇，授权发明专利5项。2020年获中国航空学会技术发明一等奖（5/6），2021年入选中国科协青年人才托举工程。

主持或参加科研项目：

某国际合作项目，P2022-C-II-003-001，基于声学和气动测量的压缩系统状态监测技术研究，2022-10至2024-10，200万元，在研，主持

国家自然科学基金委员会，青年科学基金项目，51906004，进气道-发动机匹配对压气机稳定性影响和扩稳方法研究，2020-01至2022-12, 23万元，已结题， 主持

国家自然科学基金委员会，面上项目，51976116，考虑叶尖非定常泄漏涡影响的轴流压气机失速预测模型研究, 2020-01至2023-12, 62万元，在研，参与

国家自然科学基金委员会，面上项目，51576008，多级压气机失速稳定性模型与先进扩稳方法研究，2016-01至2019-12，68万元，已结题，参与

代表性论著：

1.     Dong Xu, Liu Xiaohua, Sun Dakun, Sun Xiaofeng, Experimental investigation on SPS casing treatment with bias flow, Chinese Journal of Aeronautics, 27(6)(2014), 1352-1362.

doi: 10.1016/j.cja.2014.10.001

2.     Dong Xu, Sun Dakun, Li Fanyu, Jin Donghai, Gui Xingmin, Sun Xiaofeng, Effects of rotating inlet distortion on compressor stability with stall precursor-suppressed casing treatment, Journal of Fluids Engineering, 137(11)(2015), 111101.

doi: 10.1115/1.4030492

3.     Li Fanyu, Li Jun, Dong Xu, Zhou Youtian, Sun Dakun, Sun Xiaofeng. Stall-warning approach based on aeroacoustic principle, Journal of Propulsion and Power, 32(6)(2016), 1353-1364.

doi: 10.2514/1.B35814

4.     Cheng Fanjie, Sun Dakun, Dong Xu, Sun Xiaofeng, Prediction of stall inception in multi-stage compressors based on an eigenvalue approach, Science China Technological Sciences, 60(2017), 1132-1143.

doi: 10.1007/s11431-016-0355-3

5.     Li Fanyu, Li Jun, Dong Xu, Sun Dakun, Sun Xiaofeng. Influence of SPS casing treatment on axial flow compressor subjected to radial pressure distortion, Chinese Journal of Aeronautics, 30(2)(2017), 685-697.

doi: 10.1016/j.cja.2016.10.023

6.     Dong Xu, Sun Dakun, Li Fanyu, Jin Donghai, Gui Xingmin, Sun Xiaofeng. Effects of stall precursor-suppressed casing treatment on a low-speed compressor with swirl distortion, Journal of Fluids Engineering, 140(9)(2018), 091101.

doi: 10.1115/1.4039707

7.     Dong Xu, Sun Dakun, Li Fanyu, Sun Xiaofeng. Stall margin enhancement of a novel casing treatment subjected to circumferential pressure distortion, Aerospace Science and Technology, 73(2018), 239-255.

doi: 10.1016/j.ast.2017.12.005

8.     Sun Xiaofeng, Dong Xu, Sun Dakun, Recent development of casing treatments for aero-engine compressors, Chinese Journal of Aeronautics, 32(1)(2019), 1-36.

doi: 10.1016/j.cja.2018.11.005

9.     Dong Xu, Li Fanyu, Xu Ruize, Sun Dakun, Sun Xiaofeng, Further investigation on acoustic stall-warning approach in compressors, Journal of Turbomachinery, 141(6)(2019), 061001.

doi: 10.1115/1.4041900

10. Xu Ruize, Sun Dakun, Dong Xu, Li Fanyu Sun Xiaofeng, Li Jia. Application of stall warning approach with stall precursor-suppressed casing treatment on a two-stage compressor, Journal of Thermal Science, 28(2019), 862-874.

doi: 10.1007/s11630-019-1186-5

11. Xu Dengke, Dong Xu, Zhou Chenghua, Sun Dakun, Gui Xingmin Sun Xiaofeng, Effect of rotor axial blade loading distribution on compressor stability, Aerospace Science and Technology, 119(2021), 107230.

doi: 10.1016/j.ast.2021.107230

12. Sun Dakun, Li Jia, Xu Ruize, Dong Xu, Zhao Dan, Sun Xiaofeng, Effects of the foam metal casing treatment on aerodynamic stability and aerocoustic noise in an axial flow compressor, Aerospace Science and Technology, 115(2021), 106793.

doi: 10.1016/j.ast.2021.106793

13. Dong Xu, Zhang Letian, Sun Dakun, Sun Xiaofeng, Experimental and model investigations of SPS casing treatment on a two-stage compressor, Propulsion and Power Research, 10(1)(2021), 1-14.

doi: 10.1016/j.jppr.2021.02.001

14. Li Jia, Dong Xu, Sun Dakun, Xu Ruize, Sun Xiaofeng, Response and stabilization of a two-stage axial flow compressor restricted by rotating inlet distortion, Chinese Journal of Aeronautics, 34(9)(2021), 72-82.

doi: 10.1016/j.cja.2021.02.005

15. Sun Dakun, Li Zhenyu, Dong Xu, Sun Xiaofeng, Calibration of S-duct Swirl Distortion Based on Vortex Identification Methods, Journal of Thermal Science, 31(2022), 35-46.

doi: 10.1007/s11630-022-1547-3

16. Sun Dakun, Li Jia, Dong Xu, Xu Ruize, Sun Xiaofeng, Foam-metal casing treatment on an axial flow compressor: stability improvement and noise reduction, Journal of Turbomachinery, 144(1)(2022), 011003.

doi: 10.1115/1.4051782

17. Li Jia, Dong Xu, Sun Dakun, Wang Yuqing, Geng Chunwang, and Sun Xiaofeng, Stability enhancement and noise Reduction of an axial compressor with foam metal casing treatment, Aerospace, 9(10)(2022), 628.

doi: 10.3390/aerospace9100628

18. Xu Dengke, Dong Xu, Zhu Qiancheng, Sun Dakun, and Sun Xiaofeng, Effect of rotor blade loading distribution on flow stability of transonic compressor, Aerospace Science and Technology, 127(2022), 107729.

doi: 10.1016/j.ast.2022.107729

19. Gu Benhao, Xu Dengke, Dong Xu, Sun Dakun, and Sun Xiaofeng, A modified small perturbation stability prediction model for axial compressors with circumferential inlet distortion, Aerospace Science and Technology, 132(2023), 108079.

doi: 10.1016/j.ast.2022.108079

20. Fang Yibo, Sun Dakun, Dong Xu, Sun Xiaofeng, Effects of Inlet Swirl Distortion on a Multi-Stage Compressor with Inlet Guide Vanes and Stall Margin Enhancement Method, Aerospace, 10(2)(2023), 141.

doi: 10.3390/aerospace10020141

Sun Dakun, Wang Yuqing, Li Jia, Shen Zihan, Geng Chunwang, Dong Xu, Wang Xiaoyu, Sun Xiaofeng,

21. Optimization of impedance boundary-controlled casing treatment on subsonic compressors, Journal of Mechanical Science and Technology, 37(5)(2023), 2161-2169.

doi: 10.1007/s12206-023-2103-0

22. 董旭, 刘小华, 孙大坤, 孙晓峰, 旋转畸变条件下新型机匣处理扩稳效果试验, 航空学报, 35(09)(2014), 2411-2425.

23. 李佳, 孙大坤, 董旭, 顾本昊, 李凡玉, 孙晓峰, 旋转进气畸变下的两级压气机扩稳实验研究, 工程热物理学报, 41(06)(2020), 1425-1433.

24. 许登科, 董旭, 徐瑞泽, 李佳, 孙大坤, 孙晓峰, 压气机流动稳定性自适应控制方法研究进展, 力学学报, 54(03)(2022), 559-576.

25. 孙晓峰, 董旭, 张光宇, 王卓, 孙大坤, 特征值理论在稳定性预测中的应用研究进展, 航空学报, 43(10)(2022), 9-28.

研究内容：

Inlet Distortion & Inlet-Engine Integration

Investigations about the detrimental effects of   inlet distortions on compressor performance and stability; Four distortion types were considered:   circumferential total pressure distortion, radial total pressure distortion,   swirl distortion and rotating distortion; Distortion generators for all distortion types   have been constructed combined with the existing facilities; The inlet flow fields for different distorted   conditions were measured and depicted; Assessment for the effects of inlet distortions   has been carried out.

Casing treatment

The stall precursor-suppressed (SPS) casing   treatment has been developed and well validated on both subsonic compressor   rig and transonic compressor rig with uniform inlet and distorted inlet; The mechanism of SPS casing treatment was also   investigated by measuring the pressure perturbation energy.

Stall Warning

A stall warning approach based on the   aeroacoustic theory was developed; This method is an on-line data processing used   the dynamic pressure trace detected by only one sensor mounted on the inner   casing wall; The correlation analysis and probability distribution   analysis were engaged in this approach which can accurately indicate the   instability phenomena far before the stall inceptions.

Compressor stability control

An adaptive control method for compressor stability   was established; The geometrically adjustable SPS casing treatment   can be used as an adaptive controller with the instruction of the computer   system; The stall warning approach can monitor the   stability state of compressor and make the control system be as a feedback   loop; Effectiveness of this adaptive control method has   been validated on a low-speed compressor rig.