Study on Effect of Rotor Vibration on Tip Clearance Variation and Fast Active Control of Tip Clearance
The tip clearance flow of axial turbomachines is important for their aerodynamic and maneuver performance. And the tip clearance gap leakage flow is of continuing concern in reducing efficiency losses that occur within turbines. In order to gain significant reductions in emissions and specific fuel consumption as well as dramatic improvements in operating efficiency and increased service life of aero-engine, variation mechanism of blade tip clearance was analyzed and the equation of dynamic clearance was shown firstly, then the effect of rotor vibration in clearance variation which include flight loads and engine loads was studied in this paper; based on the dynamic measurements of blade tip clearance, a method that ensure tip clearance at optimal state in given mission profile through active rotor vibration control and active tip clearance control was presented. Besides, fuzzy control theory was used to solve the high nonlinear variation of tip clearance. The analysis result shows that this technique is useful.
Liangchi Zhang, Chunliang Zhang and Tielin Shi
B. H. Jia and X. D. Zhang, "Study on Effect of Rotor Vibration on Tip Clearance Variation and Fast Active Control of Tip Clearance", Advanced Materials Research, Vols. 139-141, pp. 2469-2472, 2010