摘要： 通过同一台增氧机在不同水温下的增氧性能试验，研究了水温对增氧机增氧性能的影响。试验时将试验水箱置于步入式恒温试验箱中，增氧机安装于注入自来水的试验水箱内，试验过程中试验水箱内水体总体积保持不变。恒温试验箱内温度可在-40℃～+80℃之间调节，控制方式为热平衡调温方式，通过可编程触摸式液晶显示屏来进行操作，调节恒温试验箱内温度，从而间接改变水体温度，以此试验了增氧机从6℃到28℃之间20个水温时的增氧能力，分析水温与增氧能力的关系。结果显示：在不同水体温度下，增氧能力有很大差异，增氧能力随着水体温度的升高而降低，水体温度从6℃上升到28℃，增氧能力下降了35.5%；增氧能力与氧质量转移系数和饱和溶氧成正比关系，但不同水温下经温度修正后增氧能力明显不同，温度修正系数的取值可能是造成这一现象的重要原因之一。研究表明，温度修正系数θ的取值应随水温变化而变化，在20℃以上时，水温越高，θ取值越小；在20℃以下时，θ与水温无明显线性关系，其取值在[1.00,1.01]之间波动，不应是固定的标准修正系数1.024。

关键词: 增氧机, 增氧能力, 溶氧, 水温, 氧质量转移系数, 温度修正系数, 水产养殖

Abstract: Through testing the oxygenation performance of an aerator at different water temperatures, the effects of water temperature on the oxygen mass transfer coefficient was studied. The test water tank was placed in a walk-in thermostatic experimental chamber, an aerator was installed in the test tank filled with tap water, and the total volume of water in the tank remained unchanged during the test. The temperature in the chamber could be adjusted between -40℃ ~ +80℃, controlled via heat balance temperature regulation mode via a programmable touch LCD screen. Through adjusting the temperature of the test chamber, the water temperature was indirectly changed, hereby the oxygenating capacity of the aerator was tested at 20 different water temperatures ranging from 6℃ to 28℃, and the relationship between water temperature and aerating capacity was analyzed. The results showed that under different water temperatures, there was a great difference in the oxygenating capacity, which decreased with the increase of water temperature. When the water temperature rose from 6℃ to 28℃, the oxygenating capacity decreased by 35.5%. The aerating capacity was positively related to the oxygen mass transfer coefficient and saturated dissolved oxygen, but it varies obviously much at different water temperatures, for which the value of temperature correction coefficient might be one important reason. The study showed that the value of temperature correction coefficient θ should change with the change of water temperature. When the temperature was above 20℃, the value of θ dropped with the increase of temperature. When below 20℃, the θ value had no obvious linear relationship with the water temperature, and instead of a constant value of 1.024, it fluctuated between 1.00 and 1.01.

Key words: aerator, oxygenation performance, dissolved oxygen, water temperature, oxygen mass transfer coefficient, temperature correction coefficient, aquaculture