一种卫星轨控发动机流量校验系统

A flow calibration system for orbit-control engine of satellite

针对目前计量部门对质量流量计校验精度只有0.5%且随时间波动的问题,采用称重法对卫星轨控发动机试验用质量流量计进行现场校验,采用真实推进剂作为校验介质,校验时管道和流量计压力与发动机试验时管道和流量计压力一致。通过现场校验,可以提高发动机试验流量测量的精度,可以在符合精度要求的流量计中挑选精度较高的流量计作为试验用主流量计,其他流量计作为备份流量计使用。

As the uncertainty of the mass flow meter calibration results is 0.5% in metrology department, a weighing system was built to execute on-line calibration of the mass flow meters used in the test for satellite orbit-control engine. The calibration material used in the test was the true propellant. And the pressure of the propellant pipes and mass flow meters was as same as the pressure in the engine test. By the calibrations, the precision of the flow rate measurement in the test of the engine can be improved. The mass flow meter which has higher precision can be chosen as a main flow meter in the test for the orbit-control engine of satellite and the others can be used as candidates.