摘要
Abstract
The distortion of engine intake temperature affects the stability of the engine,and small inertia thermocouples are usually used to measure its rapidly changing airflow temperature.In order to accurately and comprehensively obtain the dynamic characteristic of small inertia thermocouples,a dynamic characteristic calibration and evaluation method of small inertia thermocouples is porposed,and the construction of dynamic calibration device,calibration test and frequency domain analysis are introduced.The dynamic calibration method is combined with a pulse laser and a calibration wind tunnel,through the analysis of amplitude frequency characteristics and phase frequency characteristics,the evaluation method for the dynamic characteristics of small inertia thermocouples is expanded.Using this calibration method for dynamic calibration of small inertia thermocouples,the maximum relative uncertainty of type A reduces from 7.2％to 2.4％,which can be used for dynamic calibration of fast response temperature sensors below 30 ms.It provides technical reference for high-frequency dynamic temperature measurement such as engine intake temperature distortion.关键词
温度计量/小惯性热电偶/动态校准/温度畸变/脉冲激光器/校准风洞/发动机稳定性Key words
temperature measurement/small inertia thermocouple/dynamic calibration/temperature distortion/pulse laser/calibration wind tunnel/engine stability分类
通用工业技术
