通过大量冷态试验，在大范围变化工况、变化喉部面积及变化背压条件下，利用水对低温流量控制系统进行研究，得到了流量系数、压力恢复系数的变化规律。
And water is used in cold test. Through changing operating conditions, throat area and back pressure, the change rule of discharge coefficient and pressure recovery factor were found.
分析了压力变化与开断时间的关系，比较了不同基压下压气缸与喷口喉部气体压力特性的变化，说明了基压对断路器灭弧室内压力的影响。
The changes of the pressure in puffer chamber and nozzle throat under different base pressure are compared, which shows that base pressure has an influence on the pressure in gas chamber.
在大压比、大升程条件下，喉部各测点的脉动压力不大，流动稳定。
The result shows that in big pressure ratio and valve open conditions, gas fluctuation in valve seat throat is small and flow is steady.
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