柱塞式校准器检定临界流喷嘴的实验研究

Experimental study on plunger calibration devices of critical flow nozzles

介绍了一种采用标准柱塞结构的临界流喷嘴校准器的原理和组成.根据临界流喷嘴的流量特性建立了检定数学模型,同时建立工作腔气体状态方程,并进行分析.对该校准器工作腔的压力和温度进行了大量实验研究,结果表明,工作腔内气体的压力和温度在检定过程中能够保持稳定,有益于提高检定的精度和效率.利用该校准器进行临界流喷嘴背压比试验,调节被测喷嘴背压比,检测其实际流量,得到与理论曲线相一致的流量特性曲线,从而为临界流喷嘴的特性研究提供了一个良好的手段.

The principle and composition of critical flow nozzle calibration devices with ideal plunger structure were introduced.According to the flow characteristic of critical flow nozzles,the measurement model was established.Besides,the state equation of gas in the working cylinder was founded and analyzed.Plenty of experiments were carried out to study the pressure and temperature in the working cylinder.Experimental results indicated that the pressure and temperature can remain steady during the process of cert...