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Aeroacoustic Diagnostics and/or Forensics

 

 

For Pre-Bid, Pre-Construction and/or Post Installation Remediation

 

Two (2) 2000-ekW EnGen’s as originally designed, fabricated and delivered to site.

After AEC aeroacoustic diagnostics, fully remediated and criteria compliant

 

Aeroacoustic Engineering Consultants, LLC (AEC) is consistently tasked with providing aeroacoustic diagnostic and/or forensic technologies to predict a proposed project’s acoustic and aerodynamic design performance to site criteria or determine what hardware and cost may be required to modify an existing installation to meet the contractual commitments.  This is accomplished in the planning phase by utilizing AEC proprietary computer 3-D aeroacoustic modeling, client proposal drawings and vendor equipment specifications to verify the bidder’s promised performance or assist the bidder in developing the hardware configuration to comply.  For post installation performance issues, the same AEC engineering services may be augmented with field aeroacoustic empirical testing to verify defacto performance parameters and calibrate AEC 3-D computer models to develop a precise remediation work scope and present an accurate cost structure.  Engine-generators (EnGen’s) are typical “Critical Use” systems that frequently require AEC aeroacoustic diagnostics and/or forensics.

 

Measuring Exterior & Interior Aeroacoustic Parameters

Aerodynamic Microphone Measuring In-Flow sound

Exhaust Stack Resonator’s Intrinsic DIL Roll-Off with Temperature

 

A Data Center located in a residential area near Denver, Colorado (1,658-meters/5,440-feet, elevation ASL) had a local, third-party sound test two (2) individually enclosed 2000-ekW EnGen’s and were measured at just under 80-dBA at 7-meters (23-feet) distance, well exceeding the contractual criteria of 60-dBA at 7-meters!  The enclosure fabricator (Packager) commissioned AEC to develop a “fix” to be accomplished on site. 

AEC developed an aeroacoustic 3-D computer model using the Packager’s as-built drawings, equipment bid specifications and manufacturer’s EnGen parameters.  Computer modeling confirmed that the enclosure’s radiator discharge (Raddis), Intake, wall construction and engine manifold exhaust mufflers were all out of compliance!  Further, the aerodynamics computer analysis (CFD) suggested the enclosure’s added static pressure exceeded the maximum (by nearly 160%) and was subject to an EnGen high temperature shut down during extended run time and/or heavy electrical loads! 

The Packager authorized AEC to visit the EnGen site and accomplish aeroacoustic testing, including dynamic airflow visualization.  Empirical test results validated all computer modeling predictions and added engine exhaust gas recirculation onto the enclosure’s list of liabilities!

AEC utilized the computer aeroacoustic modeling to design a secondary exhaust muffler and tuned stack resonator to bring the exhaust system into compliance, without exceeding backpressure limits and eliminating recirculation.  A cost effective, airflow conditioning, drop-on silencer module was designed for the vertical Raddis stack.  The Intake section was site modified with AEC airfoil baffles using static regain technology to greatly reduce aerodynamic losses.  The completed remediation was third-party tested to be 58-dBA at 7-meters (23-feet), compliant to contractual criteria!  Remediated system aerodynamics brought the enclosure’s total static pressure loss down to 12.78-mmH2O (0.503-IWG), well within the EnGen manufacturer’s allotted tolerance for site elevation.

 

Download the PDF Datasheet Below by Clicking on Link
 

 

Copyright © 2010 Aeroacoustic Engineering Consultants, LLC
Last modified: May 30, 2018