发动机进气温度畸变影响发动机的稳定性,通常使用小惯性热电偶来测量其快速变化的气流温度。为准确全面获取小惯性热电偶的动态特性,提出了一种小惯性热电偶的动态特性校准及评价方法,并阐述了小惯性热电偶动态校准装置的构建、校准试验以及频域分析。采用脉冲激光器与校准风洞相结合的小惯性热电偶动态校准方法,通过幅频特性和相频特性分析,拓展了小惯性热电偶的动态特性评价方法。用该校准方法对小惯性热电偶进行动态校准,结果A类相对不确定度最大值由7.2%减小到2.4%,可应用于30ms以下量级快响应温度传感器的动态校准,为发动机进气温度畸变等高频动态温度测量提供技术参考。
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 30ms.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
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