Engine Exhaust Silencer

All internal combustion engines produce noise, some more or less than the others. The intensity and magnitude of the noise will vary greatly depending upon engine type i.e. naturally aspirated or turbocharged, horse power developed, means of scavenging, type of fuel used, number of cycles whether 2 cycle or 4 cycle engine etc.

Among the pre-dominant sources that make up the engine noise are the engine intake and exhaust.For the purpose of noise control on engines, it is common practise to use silencers at intake and exhaust for treating the airborne noise. In cases where standard construction silencers do not meet the particular application, the special silencers can be designed to suit specific requirements.

In silencing internal combustion engines, the most widely used silencers are the reactive type, or chamber construction silencers. This type is largely dependent on area change to reflect sound energy back to the source and utilizes the attenuation properties of expansion chambers and perforated tubes.

The Absorptive type silencers covered herein are suitable for almost all the type of engines and operating conditions and provides maximum noise attenuation within the specified pressure drop limitations. Most of the naturally aspirated and turbocharged engines are best silenced with these silencers.

PKE specialize in custom designs for meeting specific requirements. Various nozzle orientations, dual inlets / outlets, different material requirements and special silencers with insulated shell with high heat absorptive packing are available to reduce radiated noise and also serve the purpose of heat blanket.

For sizing the silencer, the important factor to be considered is the volume of exhaust flow. The open flow area within the silencer must be large enough to accommodate the exhaust flow without exceeding the engine manufacturer’s allowable backpressure. If the silencer is much too large, then the exhaust noise simply passes through using only the initial large expansion for attenuation. On the other hand, insufficient size of silencer may cause loss of power and possible damage to the engine.

Application of Exhaust silencers / Mufflers

  •  Diesel Generators
  •  Diesel Engines
  •  Natural gas Engines
  •  Bio gas Engines
  •  Fire Pump driven engines
  •  Marine engines
  •  Diesel Locomotive engines

Types of Exhaust silencers

Generally, Engine silencers are broadly classified into following categories depending on the end use.
     Hospital Grade
  •  Industrial Grade
  •  Residential Grade
  •  Commercial Grade
  •  Silencer with Spark arrestors
  •  Mufflers with sparks arrestors
  •  Silencers with Expansion bellows

Input Design Data Required

  •  Engine exhaust flow (Kg/hr)
  •  Exhaust temperature (°C)
  •  Maximum allowable backpressure ( mmwc)
  •  Silencer Inlet/ Outlet connection size (mm)
  •  Existing Noise Frequency spectrum (63 Hz to 8Khz as per the below table

We specialize in custom designs and also suggest various options to suit your specific requirements

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