On helmholtz resonator effects in the discharge system of a two-cylinder compressor

✍ Scribed by W. Soedel; E. Padilla Navas; B.D. Kotalik

• Publisher: Elsevier Science
• Year: 1973
• Tongue: English
• Weight: 689 KB
• Volume: 30
• Category: Article
• ISSN: 0022-460X
• DOI: 10.1016/s0022-460x(73)80238-x

✦ Synopsis

Discharge pressure oscillations in compressors are a common problem, especially in multicylinder compressors because of the cylinder interaction by way of discharge cavities and collecting plenums. In this paper it is demonstrated that such interactions may be simulated on the computer by viewing the discharge system as a multi-degree-of-freedom Helmholtz resonator. Such an approach is of particular advantage for industrial applications because of the usual irregular shapes of the discharge cavities and plenums. For this purpose a previously developed compressor simulation procedure that computes the dynamic behavior of compressor valves was extended to cover the interaction of two cylinders through the discharge system. Helmholtz resonator type equations were developed and solved simultaneously with the valve dynamic equations. Measured and computed discharge cavity pressures showed good agreement. Reasons for the strong excitation of the asymmetric mode of discharge gas oscillation of the prototype compressor are given and ways of suppression are discussed.