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12 Megawatt Alternator Runs Cool & Quiet !
Electric Power Generation (EPG) Application Note
Background: The client is a major manufacturer of electrical generators
and alternators with a world wide customer base. They needed a special
silencer configuration to meet a critical acoustic criteria on nine (9)
outdoor electric power generation sites. However, due to internal flow
characteristics, aerodynamic losses had to be minimized to maintain
requisite cooling air volume flow.
The client approached Aeroacoustic Engineering Consultants, LLC (AEC)
with a difficult aeroacoustic criteria and an even tougher delivery
schedule commencing in just two (2) weeks! Utilizing the AEC massive
aeroacoustic database, a complete hybrid silencer assembly was computer
simulated with high speed acoustic iteration, aerodynamically computer
modeled by computational fluid dynamics (CFD) and shop ready approval
drawings generated in just a few hours. Drawing approval was expedited
and the delivery schedule met for the first production test set.
Pictured above is one view of the 11.4 megawatt hybrid silencer package.
The Hybrid Elbow silencers are bolted to each side of the alternator (only
one side visible). Cooling air is inducted through the horizontal
opening, into the alternator, and heated air discharged downward to
Depicted is the acoustic test for the completed alternator package. AEC
hybrid silencers brought the system acoustic performance 3-dBA under the
established criteria. Empirical aerodynamic tests validated AEC CFD
modeling and production skills. Based on acceptance testing, eight (8)
more sets were ordered.
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