Method and device for correcting oil supply for hot start of aero-engine

Abstract

The application belongs to the technical field of engine hot start design, and relates to a correction method and device for aeroengine hot start oil supply. The method includes step S1, obtaining engine exhaust gas temperature EGT and engine inlet temperature T 2 , and determine the difference between the two; step S2, if the difference is greater than the first set value, give a correction coefficient associated with the difference; Correction is performed to obtain the fuel-air ratio for hot start, and the fuel supply amount is controlled according to the fuel-air ratio for hot start. The application automatically corrects the oil supply during the engine starting process by monitoring the engine parameters, effectively solving the problem of excessively high exhaust temperature of the engine hot start. Before hot start, there is no need to artificially lower the engine temperature before starting, which simplifies the user's operation process and saves the user's manpower and material costs.

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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