A method for correcting fuel supply for aeroengine plateau starting

Abstract

The present application belongs to the field of aero-engine fuel supply, and in particular relates to a method for correcting fuel supply for aero-engine plateau starting. Including: obtaining the power characteristic coefficient ε of the auxiliary power system, and the power ratio coefficient λ of the auxiliary power system, and calculating the auxiliary power correction coefficient K 辅助 ;Get the correction factor K according to the engine characteristics 常规 , and the engine ground cranking speed rise rate N 2 Dot _地面 , calculate the engine plateau starting speed increase rate N 2 Dot _高原 ;According to the engine plateau starting speed increase rate N 2 Dot _高原 , calculate the main fuel supply rule. According to the power retention characteristics of the auxiliary power system, this application corrects to obtain a more real auxiliary power, and comprehensively converts the ratio between the auxiliary system power and the turbine power within the starting speed range into the speed increase rate correction amount, and corrects the starting process so that the The speed increase rate is more matched with the actual residual power, and the fuel supply is corrected to give full play to the starting potential, shorten the starting time, and improve the starting success rate.

Description

technical field [0001] The present application belongs to the field of aero-engine fuel supply, and in particular relates to a method for correcting fuel supply for aero-engine plateau starting. Background technique [0002] In order to meet the needs of the Air Force aircraft for combat and training in the plateau, the military turbofan engine needs to have the ability to start quickly and reliably at the plateau airport. [0003] In the existing engine starting technology, the oil supply law of plateau starting is generally based on the ground design law, and the closed-loop control is carried out according to the simple pressure and temperature corrected law of classical engine characteristics. This conventional correction method can be better. It is in line with the characteristics of the engine in the plateau, but this scheme is to incorporate the working power of the auxiliary power system into the engine system and correct it together, that is, the default attenuation...

AI Technical Summary

Problems solved by technology

[0003] In the existing engine starting technology, the oil supply law of plateau starting is generally based on the ground design law, and the closed-loop control is carried out according to the simple pressure and temperature correction law of classic engine characteristics. This conventional correction method can better It is in line with the characteristics of the engine on the plateau, but this solution is to incorporate the working ability of the auxiliary power system into the engine system and correct it together, which means that the attenuation of the power of the auxiliary power system with the height of the plateau is the same as that of a typical aero engine by default. , did not fully consider the actual power retention characteristics of various auxiliary power systems, which is obviously not in line with the actual situation, and directly leads to a large deviation between the corrected auxiliary system power and the actual power, which in turn leads to the design value of the rise rate in the starting process. The actual remaining power does not match, the fuel supply is not suitable, the starting time at high altitude is too long, or there are phenomena such as stalling and overheating, which directly lead to starting failure, and the ability of the engine to start at high altitudes is not fully exerted, affecting the reliability of the aircraft at high altitudes, starting time and Success rate is not guaranteed

Images