纯净蒸汽 meaning in English

clean steam

Measurements were made of system pressure , mass flow rate of steam , air , and cooling water , temperatures of condensing flow and cooling flow , and the water level of boiler . the major phenomena observed in the present experiment are similar to those by other investigators . the mass flow rate of steam , the system pressure and air content are the most important factors affecting steam condensation
实验结果表明，维持二次侧冷却水流量不变，无论对于纯净蒸汽还是含有空气的蒸汽冷凝，随着蒸汽发生器加热功率的增大(即蒸汽流量增大) ，有效冷凝段长度将加长；当蒸汽中含有少量空气，有效冷凝段长度也会明显加长；提高系统压力，有效冷凝段长度将缩短。
The condensing length increases with the boiler heating power and air content increasing , , while it decreases with the system pressure increasing . under the normal pressure , the wall temperature and the centerline temperature along the condensing length nearly remain constant for pure steam , while they decrease continuously for steam / air mixture . however , when the steam condenses over , the temperatures drops rapidly
常压下，纯净蒸汽冷凝时，有效冷凝段管壁壁温基本保持不变，但是当蒸汽冷凝完毕进入过冷水阶段后，管壁壁温会急剧下降；蒸汽中含有空气时，冷凝管中心温度变化不大，但管壁壁温始终呈下降趋势。