Probability analysis method for functional parameters of air system

Abstract

The invention belongs to the field of aero-engine air system design, and particularly relates to a probability analysis method for functional parameters of an air system, which comprises the following steps: 1, determining an input variable; step 2, obtaining input variable measurement data; step 3, analyzing correlation between input variables; 4, analyzing input variable distribution; 5, analyzing input variable distribution; step 6, calculating functional parameters of the air system; step 7, analyzing the functional parameter probability of the air system; and 8, analyzing the sensitivity of the functional parameters of the air system. According to the probability analysis method for the air system function parameters, air system function parameter probability distribution analysis considering uncertainty is achieved for the first time, and compared with an air system function parameter limit value obtained in the prior art, the distribution condition of the air system function parameters under the actual condition can be better reflected, and an important basis can be provided for carrying out various types of analysis on the functional parameters of the air system under actual conditions.

Description

technical field [0001] The application belongs to the field of air system design of aero-engines, and in particular relates to a probability analysis method for functional parameters of the air system. Background technique [0002] The air system of an aero-engine can complete tasks such as cooling the turbine disc and blades, sealing the disc edge and adjusting the axial force by introducing a small amount of compressed air from the main channel, so as to ensure the safe and efficient operation of the engine. The air system controls the flow resistance by designing parameters such as the flow area of ​​the throttling units such as the grate teeth, holes, and pre-rotating nozzles in the flow path to control the flow resistance, so that the airflow can reach different parts of the engine as required and realize various functions of the air system. One of the commonly used throttling units with the best throttling effect is the grate tooth seal structure. [0003] Due to erro...

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Problems solved by technology

However, since the "worst case" air system model uses the extreme value of the measured data of the grate tooth gap, it cannot represent the overall situation of the measured data of the grate tooth gap, so the calculated air system function parameters are also a kind of occurrence probability is very small The limit situation of the air system cannot reflect the actual distribution of the air system functional parameters, and the existing technology has limited reference significance for the design of the engine air system

In addition, the existing technology can only know the upper limit of the distribution interval of the air system function parameters in actual conditions, and also cannot analyze and grasp the actual distribution of the air system function parameters, and it is difficult to provide effective guidance for the design of the engine air system

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