Research on the Method to Formulate the Allowable Standard for Aero-Engine Labyrinth Seals Clearances

In order to formulate labyrinth seals clearances allowable standard to ensure the operation safety of aero-engine taking the realization of air system functions into concern, this paper put forward a method to formulate the allowable standard for labyrinth seals clearances on the basis of probabilistic analysis and surrogate modeling of functional parameter of internal air system. In this method, the key labyrinth seals of every functional parameter of internal air system could be recognized, and the corresponding allowable range for every functional parameter could be determined precisely. The aggregation of all the allowable ranges formulates the allowable standard. Through an internal air system case, the procedures of the proposed method are described concretely, and the allowable standard for the fourteen labyrinth seals clearance is obtained in terms of internal air system function realization, which demonstrates the value of proposed method in the production and repair of high-quality aero-engine. Moreover, the case gives concrete evidence that the labyrinth seals clearances allowable standard could be formulated exclusively for a certain aero-engine by the proposed method.