主持或参加科研项目：
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，在研， 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; Li Fanyu; Xu Ruize; Sun Dakun*; Sun Xiaofeng; Further Investigation on Acoustic Stall-Warning Approach in Compressors, ASME J. Turbomach., 2019, 141(6), 061001-061001-10.
(2) 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, ASME. J. Fluids Eng., 2018, 140(9), 091101-091112.
(3) 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, 2018, 73(2), 239-255.
(4) 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, ASME. J. Fluids Eng., 2015, 137(11), 111101-111115.
(5) Dong Xu; Liu Xiaohua; Sun Dakun*; Sun Xiaofeng; Experimental Investigation on SPS Casing Treatment with Bias Flow, Chinese journal of aeronautics, 2014, 27(12), 1352-1362.
研究内容：
Inlet Distortion |
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. |