Correcting method and device for aviation engine hot-starting oil supply

Abstract

The invention belongs to the technical field of engine hot-starting design, and relates to a correcting method and device for aviation engine hot-starting oil supply. The method comprises the following steps of S1, acquiring an engine exhaust temperature EGT and an engine inlet temperature T2, and determining a difference value between the engine exhaust temperature EGT and the engine inlet temperature T2; S2, giving a correction coefficient associated with the difference value if the difference value is larger than a first set value; and S3, correcting a reference starting oil-gas ratio according to the correction coefficient to obtain a hot-starting oil-gas ratio, and controlling the fuel supply amount according to the heat-starting oil-gas ratio. According to the method, the engine parameters are monitored to automatically correct the oil supply of the engine starting process, and the problem that the engine hot starting exhaust temperature is too high is effectively solved; and thetemperature of an engine is not required to be reduced before hot-starting, so that the operation process of a user is simplified, and the labor and the material cost of the user are saved.

Description

technical field [0001] The application belongs to the technical field of engine hot start design, and in particular relates to a correction method and device for fuel supply for hot start of an aeroengine. Background technique [0002] The process of accelerating the engine from a static state to an idle working state is called the ground starting process of the engine. As an essential part of engine work, its performance is directly related to the characteristics of the engine. [0003] The ground starting process of an aero-engine is generally divided into the following three stages. [0004] Stage I: The starter drives the engine rotor to accelerate to the ignition and oil supply speed n to supply oil. In this stage, the output power of the starter overcomes the engine resistance torque and drives the engine rotor to accelerate. [0005] Stage II: When the engine reaches the ignition and fuel supply speed n, the fuel is supplied to the combustion chamber to ignite, the ...

AI Technical Summary

Problems solved by technology

[0012] Using the oil-air ratio to calculate the fuel supply in the starting process is a widely used starting fuel supply scheme for aero-engines. When the existing engine is hot-started, the turbine components are not completely cooled, the blade tip clearance is small, and the efficiency is higher than that in the cold state. The fuel demand is reduced, and fuel supply with regular start-up fuel supply rules may cause engine start-up surge or overheating

The existing measure is to reduce the temperature of the turbine parts of the engine by cold running before the hot start. This method increases the operation before starting, and also increases the number of times the starter is used, which consumes the service life of the starter

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