你好 想请教您一个关于燃料电池的问题

【专家解说】：你问的问题和Fluent的关系更大一点。简单来说就是为了避免处理绝对压力(很大的数字)，采用相对压力来计算，所以减掉一个operating pressure，就像是绝度温度和摄氏度中间差一个273.15一样。 FLUENT avoids the problem of roundoff error by subtracting the operating pressure (generally a large pressure roughly equal to the average absolute pressure in the flow) from the absolute pressure, and using the result (termed the gauge pressure). The relationship between the operating pressure, gauge pressure, and absolute pressure is shown below. The absolute pressure is simply the sum of the operating pressure and the gauge pressure: 对燃料电池来说一般operating pressure 设一个大气压就好了，除非电堆是高压系统，有很大的背压，在那种情况下设成电堆阴极的背压就好了