| Temperature plays a pivotal role in the development of aero-engines,and the upper limit of temperature will directly determine the upper limit of performance of aeroengines.Turbine blades are one of the most important hot-end parts inside the aero-engine,and they are very prone to risks such as fracture when the temperature is too high,which directly leads to abnormal operation of the aero-engine.Therefore,it is very necessary to monitor the temperature of the turbine blades of the aeroengine in real time.In the field of temperature measurement of aeroengine turbine blades,radiation temperature measurement technology is the most mainstream temperature measurement method.Due to the late start of domestic technology,there is a big gap with Western countries in technology.Radiation pyrometers can be divided into large radiation pyrometers and small radiation pyrometers according to their size.Large pyrometers have relatively higher temperature measurement accuracy and more extensive expansion functions,while small pyrometers have unique advantages in portability.Thesis will design a small radiation pyrometer that can be used on airborne,which can monitor the surface temperature of turbine blades in real time and prevent engine accidents caused by excessive temperature.The work of thesis is as follows:1.In order to collect optical information in the high-temperature environment inside the aero-engine,a set of radiation pyrometer probes is designed in thesis.The probe is mainly composed of a reflector,a probe housing,a light pipe,a mount,a fixed plate,a photodetector,and a back cover,which can realize real-time collection of the surface radiation information of the turbine blade and convert it into an electrical signal.Then a set of probe test platform was built,and the basic function test of the radiation pyrometer probe was carried out.The results show that all functions can meet the requirements.2.In order to process the electrical signal output by the photodetector and display the processed temperature data,a radiation pyrometer chassis is designed.The radiation pyrometer chassis is mainly composed of a power supply module,a photodetector amplification module,a photodetector cooler power supply module and a data acquisition and processing module.After the design is completed,the radiation pyrometer chassis is programmed,and then it is connected with the radiation pyrometer probe and the function test is carried out on the test platform.The results show that the pyrometer chassis can complete the established functions.3.In order to get the voltage-temperature function inside the pyrometer,thesis uses the designed radiation pyrometer to carry out the voltage acquisition experiment.Then,the experimental data were fitted on the software,and the final fitting function was programmed into the radiation pyrometer chassis.Finally,thesis uses the designed small radiation pyrometer to carry out the radiation temperature measurement experiment and compares its performance with the large radiation pyrometer.The results show that the small radiation pyrometer has a certain temperature measurement accuracy(the temperature measurement error is within 1%).Compared with large radiation pyrometers,it has obvious advantages in portability. |
