In order to prevent the engine flameout during operation,the real-time flame state monitoring in the combustion chamber is crucial.This paper presents a non-intrusive,real-time online engine flame monitor-ing method based on the optical images,and the experimental validation is conducted on a combined engine after-burner.A high-speed camera captures OH* spontaneous emission images of the flame in the afterburner combus-tion chamber,which are processed in real time using an image processing system embedded in an FPGA(Field Programmable Gate Array)board.This system can extract flame features that characterize the combustion condi-tion,enabling online monitoring of the flame state with a response time of approximately 25 ms using a threshold judgment algorithm.Moreover,it was observed that during the flameout stage,the flame area pulsation accelerat-ed,and the flame intensity fluctuated more intensely.The monitoring system with high sensitivity enables the de-tection of these flameout characteristics,which could potentially facilitate early warning of abnormal combustion states such as flameout in the future.
Spontaneous emission of OH*Combustion diagnosisEngine flame monitoringFlame fea-ture extractionNon-contact measurementFlame state recognition
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