기술 문서를 읽다 보니 아래와 같은 내용이 나옵니다.
Compressors can be connected in series to increase their discharge pressure (compression ratio) or they can be connected in parallel to increase their flow capacity. Series compressors on the same shaft can usually be protected by a single anti-surge control system.
When driven by different shafts, they require separate anti-surge systems, although an overall surge bypass valve can be common to all surge controllers through the use of a high signal selector. This eliminates the interaction that otherwise would occur between surge valves, as the opening of a bypass around one stage not only would increase the flow through the higher stages but also would decrease it through the lower ones. In some installations, this interaction has been found to be of less serious consequence than the time delay caused by the use of a single overall bypass surge valve, which cannot quickly increase flow in the upper stages. In such installations it is best to duplicate the complete surge controls around each compressor in series.
series compressor로 구성된 시스템에서 각 Compressor가 Anti-Surge bypass valve를 가지고 있는 경우, 중간 stage에 있는 anti-surge bypass valve가 열리면 앞뒤 Stage의 flow가 어떻게 변하는지에 대한 설명으로 이해됩니다...
제가 생각하기에는 higher stage (downstream)은 flow가 감소하고, lower stage (upstream)은 변화가 없을 것으로 예상되는데, 위의 설명이 맞는 것일까요?
