| WANG Youtao,CHEN Yang,QIU Xuelu,ZHENG Junyu,SONG Jinlong.Carbon Deposit/Greasy dirt Cleaning of Aero-engine by Air Jet with Ultra-low Temperature Ice Particles[J],54(4):165-179 |
| Carbon Deposit/Greasy dirt Cleaning of Aero-engine by Air Jet with Ultra-low Temperature Ice Particles |
| Received:June 25, 2024 Revised:November 11, 2024 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2025.04.013 |
| KeyWord:ice particles air jet carbon deposit greasy dirt engine cleaning |
| Author | Institution |
| WANG Youtao |
Liyang Aero Power Co., Ltd., AECC, Guiyang , China;School of Energy and Power Engineering,Liaoning Dalian , China |
| CHEN Yang |
School of Mechanical Engineering, Dalian University of Technology, Liaoning Dalian , China |
| QIU Xuelu |
School of Mechanical Engineering, Dalian University of Technology, Liaoning Dalian , China |
| ZHENG Junyu |
Liyang Aero Power Co., Ltd., AECC, Guiyang , China |
| SONG Jinlong |
School of Mechanical Engineering, Dalian University of Technology, Liaoning Dalian , China |
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| Abstract: |
| Since aero-engine is the power device of an aircraft, carbon deposit/greasy dirt on it seriously affects engine performance and needs to be cleaned in time. However, the existing cleaning technologies have the drawbacks of high pollution, low efficiency, and easy to cause damage to the substrate. Herein, it was proposed to clean the carbon deposit/greasy dirt on the surface of typical parts of aviation engines using air jet with ultra-low temperature ice particles. Firstly, the surface morphology and chemical element of the carbon deposit/greasy dirt was measured by Scanning Electron Microscope (SEM) and X-ray Energy Spectrometer (EDS). SEM images showed that there were two different microstructures distributed on the surface. One was the typical structure of carbon deposit consisting of clusters of nanoscale particles, and the other was a relatively flat greasy dirt surface that contained a small number of bumps and pits. EDS spectra indicated that C was the major element in the carbon deposit/greasy dirt at about 69.59wt.%, which was much larger than 9.25wt.% of the substrate. To explore the optimal cleaning parameters, single-factor experiments were conducted by adjusting the spraying pressure, spraying angle, spraying distance, spraying time and flow rate of ice particles. The results indicated that different parameters had different effects on the cleaning effectiveness that was characterized by the removal of carbon deposit/greasy dirt in an unit area. For example, the spraying pressure and flow rate of ice particles were conducive to the removal of carbon deposit/greasy dirt, while the spraying distance was negatively correlated with that. Then, the optimal cleaning parameters were determined at 0.8 MPa spraying pressure, 65° spraying angle, 4 cm spraying distance and 32.75 g/s flow rate of ice particles, under which the carbon deposit/greasy dirt could be removed completely in 5 s of cleaning time, showing a high cleaning efficiency. The carbon deposit/greasy dirt was removed partially and showed convoluted sheet structures after cleaning for 2 s, resulting in a peak tendency in surface roughness with increasing cleaning time. When the cleaning time was longer than 5 s, there were no obvious changes in the surface roughness, indicating that the impact force of jet was not enough to change the surface morphology of the substrate. Subsequently, through controlling the spraying gun along a defined route, a continuous cleaning process was achieved, and the sample with the size of about 50 mm×14 mm could be cleaned within only 20 s. Finally, to further investigate the influence of the air jet with ultra-low temperature ice particles on the property of the substrate material, the surface morphology, surface roughness, element content and distribution, crystal structure, metallographic organization, and mechanical property of K424 high-temperature alloy were measured. And the results indicated that there were no obvious changes in the performance of the substrate materials before and after jet impact, realizing damage-free cleaning. Overall, this air jet with ultra-low temperature ice particles cleaning technology show a high cleaning efficiency and significant application prospects in the field of carbon deposit/greasy dirt cleaning on the surface of aviation engines. |
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