Research And Simulation Of High Temperature Pyrometer’s Key Structure

With the development of science and technology,the temperature measuring instrument has been applied in more and more industrial fields.As one kind of temperature measuring equipment,the high temperature pyrometer adopts the noncontact temperature measuring method,which can realize the temperature measurement and monitoring of high-temperature dynamic objects in a narrow and complex environment.In some applications,high temperature pyrometer need to work under high temperature and high pressure condition with the erosion of the high speed airflow.In order to ensure the normal operation of the pyrometer in harsh environment,it’s necessary to analyze the key structure of the high temperature pyrometer.The main investigation contents of the thesis are as follows:(a)By analyzing the steady state model of the high temperature part of the pyrometer,the factors affecting the performance of the pyrometer are investigated,such as materials,the installation mode of the reflector,the size of cooling-air outlet and the pressure of the cold air.And the optimized structure of the pyrometer follows: the materials of the pyrometer is Haynes 230 nickel alloy and the reflector is installed inside the pyrometer without touching the sleeve of the pyrometer.The single layer sleeve is selected and the diameter of the cooling-air outlet is 6mm.the pressure of the coolingair is 1.7 MPa under the condition of 1000℃,1.5 MPa with 300m/s air flow.(b)By analyzing the steady state model of the high temperature pyrometer,the performances of the pyrometer under different boundary conditions are shown.The results exhibit that the temperature and the deformation of sleeve increases with the development of the airflow’s speed.However,the temperature of the reflector remains stable with growing airflow’s speed.Besides,the direction of the high-temperature airflow does affect the temperature and the deformation of the sleeve and the sleeve shows a bending trend along the airflow direction.(c)The modal analysis and the transient state model of the pyrometer is established.It’s shown that the temperature of the sleeve keep increasing during the 15 s working period and the temperature of the reflector drops first and then rise in mode 1.And the temperature of the reflector increase with time in mode 2.The modal analysis calculated the first six-order eigen frequency of pyrometer and the results show that the eigen frequency of the pyrometer would decrease with the development of the environment temperature.In this thesis,the optimized structure and the performances under different boundary conditions of the pyrometer are studied by finite element analysis,which can provide guidance for the development of the high temperature pyrometer.