REDUCTION OF NOISE EMISSION IN EXHAUST-GAS TURBOCHARGERS

The Authors (of Brown Boverie) first explain how noise is produced by turbocharger compressors. This noise has become more serious with the higher turbocharger speeds and pressure ratios called for by the increased outputs of Diesel engines in recent years. Most of the article is concerned with successful practical measures for reducing turbocharger noise, in particular that of large turbochargers in Brown Boverie's VTR series. The first step that must be taken to reduce turbocharger noise-level is to insulate the air duct on the compressor outlet side; the second is to fit an outlet silencer if the walls of the scavenge-air receiver are thin and emitting much noise; the third step, taken if the noise emitted into the engine-room by large turbochargers is still excessive, is to apply absorbent insulation to the compressor casing. Some results of test-bed noise-measurements on an experimental Sulzer RND 90 engine equipped with a VTR 631 turbocharger (for three of its eight cylinders) are discussed; the turbocharging system was fitted with different noise-damping equipment for the various tests. A new type of intake silencer for VTR turbochargers, to reduce intake noise to match the reduction that can be achieved on the compressor outlet side, is described; information is given on its testing and on its performance (including pressure drop) as compared with the standard silencer. It is mentioned that it is possible to reduce turbocharger noises still more, or at least to prevent them rising further; whether this was worth while would depend largely on the ship and on how far other engine-room noises could be reduced.

• Supplemental Notes:
  • Paper presented at Conference on Vibration and Noise Levels in Ships.
• Corporate Authors:

  Institute of Marine Engineers

  Memorial Building, 76 Mark Lane
  London EC3R 7JN,   England 
• Authors:
  • Ikonomu, J
  • Karrer, H
  • WATSON, J
• Publication Date: 1976-10-21

Media Info

• Features: References;
• Pagination: 4 p.

Subject/Index Terms

• TRT Terms: Engine rooms; Machinery; Noise; Noise control; Turbochargers
• Uncontrolled Terms: Noise reduction
• Old TRIS Terms: Engine room noise; Machinery noise; Turbocharging systems
• Subject Areas: Environment; Marine Transportation;

Filing Info

• Accession Number: 00156277
• Record Type: Publication
• Source Agency: British Ship Research Association
• Files: TRIS
• Created Date: Jun 22 1977 12:00AM