你好 想請(qǐng)教您一個(gè)關(guān)于燃料電池的問題

【專家解說】：你問的問題和Fluent的關(guān)系更大一點(diǎn)。簡(jiǎn)單來說就是為了避免處理絕對(duì)壓力(很大的數(shù)字)，采用相對(duì)壓力來計(jì)算，所以減掉一個(gè)operating pressure，就像是絕度溫度和攝氏度中間差一個(gè)273.15一樣。 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: 對(duì)燃料電池來說一般operating pressure 設(shè)一個(gè)大氣壓就好了，除非電堆是高壓系統(tǒng)，有很大的背壓，在那種情況下設(shè)成電堆陰極的背壓就好了