Helicopter Engine Intake Barrier Filter Design


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N Bojdo A Filippone
European Rotorcraft Forum
Sep 2011

This contribution concerns the design of Intake Barrier Filters (IBF) for Helicopters. These protective devices are fitted to the engine intakes of helicopters to prevent sand and dust reaching the engine during operations in dusty environments. Their design is dependent on and unique to the rotorcraft to which they are fitted, and can be optimised for minimum pressure drop and maximum endurance accordingly by altering the filter geometry.

Three main constraints govern the design of IBF. They are:

  • Intake architecture
  • Engine mass flow
  • Particle size distribution of local dust

The filter is a pleated multi-ply fabric. By changing the fold depth and pitch, the filter can be optimised to perform at minimum pressure drop and maximum endurance for a given constraint set.