双腔负压法用于激波管动态压力校准

针对激波管中使用双腔负压法以获取微小阶跃压力进行了研究。使用北京长城计量测试技术研究所的100 mm激波管以及专门设计的附加装置,对绝压与微压传感器进行了校准实验,实验数据表明在激波管上使用双腔负压法与薄纸膜片能获得小于2 kPa的微小反射激波阶跃压力,上升时间与平台持续时间等各项指标也都符合国家检定规程的要求,扩展了现有激波管的技术能力。比较了不同静态压力和动态幅值情况下压力传感器激波管校准结果,谐振频率和阻尼比系数都随压力增大而增大,这在实际校准和使用中是一个值得注意的问题。

The Dual-chamber Negative Pressure Method for Dynamic Pressure Calibration of the Shock Tube

A dual-chamber negative pressure method(DCNPM) with shock tube was investigated to get micro step pressure. Using CIMM’s 100 mm shock tube and other additional installations, several absolute pressure sensors and micro pressure sensors were tested with DCNPM. The test data indicate that less than 2 kPa step pressure can be get in shock tube with DCNPM and thin paper film, and the step pressure parameters like rise time and flat duration comform to the national metrology regulation. Thereby the technical capability of the existing shock tube is extended. The sensors test results with different static pressure and pressure amplitude were compared, and the resonant frequency and damping ratio increased with the pressure. So it is worth to pay attention in practical calibration and test.