Why does the centrifugal Taikang compressor have such a high speed

Why does the centrifugal Taikang compressor have such a high speed Centrifugal compressors require speed during operation, and the speed is very high. However, many people do not understand, why does a centrifugal compressor need such a large speed? Let us take a centrifugal Taikang compressor as an example to explain this problem for everyone. Taikang Compressor First, for an impeller of a certain size, the higher the speed n, the more energy the gas obtains and the greater the pressure increase. 　　Second, for the same circumferential speed (also known as the same impeller function), the higher the speed n, the smaller the diameter of the impeller, so the smaller the size and weight of the Taikang compressor; 　　 Then, because the centrifugal Taikang compressor can increase the pressure of the gas through an impeller is limited, the single-stage pressure ratio (outlet pressure to inlet pressure ratio) is generally only 1.3 to 2.0. If the gas pressure required by the production process is high, for example, the centrifugal air compressor in the full low-pressure air separation equipment needs to increase the air pressure from 0.1 MPa to 0.6 to 0.7 MPa, which requires multi-stage compression.

　Next, after the impeller size is determined, the higher the speed of the Taikang compressor, the greater the pressure ratio of each stage, so that for a certain total pressure ratio, the number of compressor stages can be reduced. Therefore, when designing centrifugal Taikang compressors, higher speeds are often used. However, as the rotational speed increases, the strength of the impeller becomes a prominent contradiction. At present, the closed impeller made of general alloy steel usually has a peripheral speed of less than 300m/s. Finally, for the small-capacity centrifugal Taikang compressor, due to the small air volume and the small impeller diameter, a higher speed can be used; while the larger-capacity Taikang compressor, due to the larger impeller diameter, accordingly The speed should also be lower. 　　In summary, I believe everyone has understood why the centrifugal Taikang compressor needs such a large speed! Only a compressor with a large speed can have enough power in operation.