Use of a Large-Scale Model to Predict Silencer Performance

Abstract

Although gas turbine noise control has been a major problem for many years, it has become particularly severe with the evolution of gas turbines rated at 40 MW and larger for the utility industry. Theoretical modeling and small model testing have not proven satisfactory for accurate prediction of silencer performance. To remedy these shortcomings, large-scale model tests were found necessary. The test hardware required for these large model tests along with procedures for scaling large models to full size is discussed in this paper. Also included are a discussion about an actual test of an exhaust silencer designed for a 2-MW gas turbine. The test utilized a dynamic insertion loss test facility designed to simulate gas turbine or reciprocating engine exhaust and intake noise and flow conditions.