| LUO Yun-he，ZENG Xiao-jie.Instability Detecting Method of a Twin-spool Gas Turbine Engine based on Flight Data[J].航空发动机,2021,47(5):1-5 |
| Instability Detecting Method of a Twin-spool Gas Turbine Engine based on Flight Data |
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| Key Words:twin-spool gas turbine engine flight data non-dimensional rotational speed difference non-dimensional rotational speed |
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| Abstract:In order to detect the working condition of the engine through the flight data，the analysis of the working characteristics of
the twin-spool gas turbine engine was carried out，and a method for detecting the instability of the twin-spool gas turbine engine was pro?
posed based on the flight data. There was a definite corresponding relationship between the non-dimensional rotational speed difference of
high-pressure and low-pressure rotor and the non-dimensional rotational speed of low-pressure rotor when the twin-spool gas turbine en?
gine worked normally. It was also verified through the analysis of multiple flight data that this corresponding relationship would change after
the aerodynamic instability of the engine. The instability of the engine could be studied by analyzing the relationship between the non-di?
mensional rotational speed difference and the non-dimensional rotational speed. The detecting method was applied in analyzing an engine
shut-down in flight. The results show that this method is simple and easy，the data used are common flight data，and the calculation work?
load is small. It can well describe the development process of engine instability. Compared with the direct detect data，the method can find
the moment of departing from steady state 20 s earlier，and the cause can be determined more accurately，which can be applied to engine
fault analysis and prediction. |
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