【Q&A】May 27, 2017
Thread Content
What is the concept of compressor surge? Answer: During operation of the compressor, as the flow rate continues to decrease until it reaches its minimum value, severe rotational separation occurs within the compressor’s flow channels, causing the outlet pressure to drop suddenly. When the outlet pressure of the compressor drops, the pressure in the pipeline network does not decrease; as a result, the gas in the pipeline network flows back into the compressor. When the pressure in the pipeline network drops below the pressure at the compressor outlet, the backflow stops and the compressor begins to supply air to the pipeline network again, returning to normal operation. However, once the pressure in the pipeline network rises back to its original level, the compressor’s flow rate decreases again, causing gas to flow back in the system. This process repeats over and over, resulting in periodic fluctuations in air flow within the entire system, a phenomenon known as surge. Haichuan Network’s special May Day event, “Remembering the Glorious Moments,” warmly invites your participation: http://bbs.hcbbs.com/thread-1774529-1-1.html (Source: Haichuan Chemical Forum). A summary post for Haichuan Network’s May Day event, “Remembering the Glorious Moments”: http://bbs.hcbbs.com/thread-1774532-1-1.html (Source: Haichuan Chemical Forum). The first round of voting for the creative ideas contest (use your mouse to influence the results): http://bbs.hcbbs.com/thread-1776507-1-1.html
When the inlet flow rate to the compressor becomes low enough, severe rotational stall occurs throughout the diffuser flow channel. The outlet pressure of the compressor drops suddenly, causing the pressure in the pipeline network to be higher than the compressor’s outlet pressure; this forces the airflow to flow back into the compressor. Once the pressure in the pipeline network drops below the compressor’s outlet pressure, the compressor resumes supplying air to the pipeline network and returns to normal operation
Surge occurs due to factors such as low inlet pressure and insufficient intake volume, resulting in backflow of gas at the outlet. Once this backflow takes place, the gas is compressed again; when its pressure exceeds that at the outlet, it is sent out once more. This repetitive process occurs under unstable operating conditions, accompanied by increased instability such as vibrations in the equipment
Surge is a type of vibration that occurs under abnormal operating conditions when the flow rate decreases to a certain level.
When the inlet flow rate to the compressor becomes low enough, severe rotational stall occurs throughout the diffuser flow channel. The outlet pressure of the compressor drops suddenly, causing the pressure in the pipeline network to be higher than the compressor’s outlet pressure; this forces the airflow to flow back into the compressor. Once the pressure in the pipeline network drops below the compressor’s outlet pressure, the compressor resumes supplying air to the pipeline network and returns to normal operation. When the pipeline pressure returns to its original level, the flow rate remains below the surge flow rate of the unit; the compressor experiences rotational stall again, the outlet pressure drops, and the airflow in the pipeline flows back into the compressor. This process repeats over and over: at times, air flow is sent to the pipeline network, and at other times it flows back to the compressor, causing significant fluctuations in the compressor’s flow rate and outlet pressure. These fluctuations result in intense air flow variations within the compressor, and this phenomenon is known as compressor surge. Generally, the larger the capacity of the piping network, the greater the surge amplitude and the lower the frequency; conversely, the smaller the capacity of the piping network, the smaller the surge amplitude and the higher the frequency.