Axial Compressor Surface Finish Improvement

NCMS Project #: 140937

Problem: The T700-GE-401C engine is operated in the MH-60 helicopter. The MH-60 regularly operates in austere environments that cause severe compressor erosion driven by particulate ingestion. The T700 team is currently assessing compressor erosion resistant coatings under CIP. One requirement that is being investigated is leveraging the coating technology to apply an improved initial airfoil surface finish that will allow for additional performance margin. The most effective method to investigate the impact of this surface finish improvement is to build two statistically significant populations, one improved and one baseline, and compare the as tested performance results.

Benefit: Preventing corrosion will elongate the life expectancy of an engine, thereby making it more useful, productive, and efficient. Also, the need for technical, maintenance labor, not to mention the cost of equipment down time, will be reduced.

Solution/Approach: As the T700 is nearing the end of production this approach is not feasible. A viable option is to coat a similar architecture production engine and utilize that data. This initiative will implement an improved axial compressor surface finish, using the T408 as a surrogate, to evaluate reduced fuel consumption, improved engine operability, and longer time on wing (TOW), all resulting in significantly lower operational costs and improved readiness. This project will develop the required finishing processes and evaluate the initial performance benefits in terms of specific fuel consumption (SFC) and T4.5 temperature margin reduction via acceptance test procedure (ATP) results.

Impact on Warfighter:

  • Improved warfighter readiness
  • Reduced engine fuel burn
  • Reduced maintenance costs

DoD Participation:

  • U.S. Navy NAVAIR (Patuxent River)

Industry Participation:

  • GE Aviation
  • MDS Coating Technologies
  • NCMS

Benefit Area(s):

  • Cost savings
  • Mx avoidance & reliability
  • Improved readiness
  • Durability

Focus Area:

  • Coatings/corrosion prevention