초록 ▼

Surging of a centrifugal compressor is avoided by ensuring that in operation [Figure] WHERE K and k are parameters whose values depend on the characteristics of the compressor, g is the acceleration due to gravity, hp is the polytropic head produced by the compressor, Vc is the velocity of sound in

Surging of a centrifugal compressor is avoided by ensuring that in operation [Figure] WHERE K and k are parameters whose values depend on the characteristics of the compressor, g is the acceleration due to gravity, hp is the polytropic head produced by the compressor, Vc is the velocity of sound in said inlet gas, and Mn (the Mach Number) is the ratio of the flow velocity V of the gas at the inlet to the compressor to the velocity of sound Vc therein. This is normally effected by arranging that [Figure] where Dp is the differential pressure across a throttling member disposed in an inlet duct of the compressor, P1 is the compressor inlet pressure, and P2 is the compressor outlet pressure.

대표청구항 ▼

Apparatus comprising a centrifugal compressor; means for producing in operation a first signal which is functionally related to the ratio [Figure] where g is the acceleration due to gravity, hp is the polytropic head produced by the compressor, and Vc is the velocity of sound in inlet gas entering t

Apparatus comprising a centrifugal compressor; means for producing in operation a first signal which is functionally related to the ratio [Figure] where g is the acceleration due to gravity, hp is the polytropic head produced by the compressor, and Vc is the velocity of sound in inlet gas entering the compressor; means for producing in operation a second signal which is functionally related to Mn2, where Mn (the Mach Number) is the ratio of the flow velocity V of the gas at the inlet to the compressor to the velocity of sound Vc therein; and control means for preventing surging of the compressor, said control means being controlled by said first and second signals, and ensuring that in operation [Figure] where K and k are parameters whose values depend on the characteristics of the compressor.