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Active generalized predictive control of turbine tip clearance for aero-engines

Peng Kai  Fan Ding  Yang Fan  Fu Qiang  Li Yong  
【摘要】:Active control of turbine blade tip clearance continues to be a concern in design and control of gas turbines.Ever increasing demands for improved effciency and higher operating temperatures require more stringent tolerances on turbine tip clearance.In this paper,a turbine tip clearance control apparatus and a model of turbine tip clearance are proposed; an implicit active generalized predictive control(GPC),with auto-regressive(AR) error modifcation and fuzzy adjustment on control horizon,is presented,as well as a quantitative analysis method of robust perturbation radius of the system.The active clearance control(ACC) of aero-engine turbine tip clearance is evaluated in a lapse-rate take-off transient,along with the comparative and quantitative analysis of the stability and robustness of the active tip clearance control system.The results show that the resultant active tip clearance control system with the improved GPC has favorable steadystate and dynamic performance and benefts of increased effciency,reduced specifc fuel consumption,and additional service life.

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