The combustion chamber temperature of newgeneration aircraft engines can reach an ultrahigh temperature of 1800℃,making temperature monitoring of key components crucial.Thin-film thermocouples(TFTCs)are highly sensit...The combustion chamber temperature of newgeneration aircraft engines can reach an ultrahigh temperature of 1800℃,making temperature monitoring of key components crucial.Thin-film thermocouples(TFTCs)are highly sensitive and have rapid response times;however,their upper-temperature limit remains below 1800℃.This study proposes an ultrahightemperature film thermocouple,which is enhanced by yttriastabilized zirconia(YSZ)for positive films,indium oxide(In_(2)O_(3))for negative films,and aluminum oxide(Al_(2)O_(3))for protective films.The thermocouple is designed on the basis of temperature measurement principles,first principles,and simulations,and it is manufactured via screen printing.The results indicate that the maximum working temperature is 1850℃.In experiments with different doping ratios at 1800℃,the thermocouple achieves a maximum temperature electromotive force(TEMF)of 258.5 mV and a maximum Seebeck coefficient of 180.9μV/℃,with an In_(2)O_(3):YSZ92(ZrO_(2)(92 wt%):Y_(2)O_(3)(8 wt%))ratio of 9:1 in wt%.Through the lumped heat capacity method,the response time was measured at 2.8 ms,which demonstrated good dynamic response characteristics.A film thermocouple was successfully utilized to measure a gas temperature of 1090℃ at the outlet of an air turbine rocket(ATR)engine,confirming its high-temperature operational capability.To improve the repeatability of the TFTCs without affecting their thermoelectric outputs,a convolutional neural network-long short-term memory network(CNN-LSTM)-attention neural network is implemented to mitigate the repeatability errors,achieving a high repeatability of 99.53%.Additionally,the compensated temperature data are compared with those obtained from a standard B-type thermocouple,showing a full-scale error of±0.73%FS.This study provides a feasible solution for ultrahigh temperature measurements.展开更多
基金supported in part by the National Key R&D Program(No.2023YFB3209600)the National Natural Science Foundation of China(No.52475570).
文摘The combustion chamber temperature of newgeneration aircraft engines can reach an ultrahigh temperature of 1800℃,making temperature monitoring of key components crucial.Thin-film thermocouples(TFTCs)are highly sensitive and have rapid response times;however,their upper-temperature limit remains below 1800℃.This study proposes an ultrahightemperature film thermocouple,which is enhanced by yttriastabilized zirconia(YSZ)for positive films,indium oxide(In_(2)O_(3))for negative films,and aluminum oxide(Al_(2)O_(3))for protective films.The thermocouple is designed on the basis of temperature measurement principles,first principles,and simulations,and it is manufactured via screen printing.The results indicate that the maximum working temperature is 1850℃.In experiments with different doping ratios at 1800℃,the thermocouple achieves a maximum temperature electromotive force(TEMF)of 258.5 mV and a maximum Seebeck coefficient of 180.9μV/℃,with an In_(2)O_(3):YSZ92(ZrO_(2)(92 wt%):Y_(2)O_(3)(8 wt%))ratio of 9:1 in wt%.Through the lumped heat capacity method,the response time was measured at 2.8 ms,which demonstrated good dynamic response characteristics.A film thermocouple was successfully utilized to measure a gas temperature of 1090℃ at the outlet of an air turbine rocket(ATR)engine,confirming its high-temperature operational capability.To improve the repeatability of the TFTCs without affecting their thermoelectric outputs,a convolutional neural network-long short-term memory network(CNN-LSTM)-attention neural network is implemented to mitigate the repeatability errors,achieving a high repeatability of 99.53%.Additionally,the compensated temperature data are compared with those obtained from a standard B-type thermocouple,showing a full-scale error of±0.73%FS.This study provides a feasible solution for ultrahigh temperature measurements.
