Expanding Helicopter Noise Simulation Scope, based on High-Fidelity CFD
Manuel KeBler, University of Stuttgart
Expanding Helicopter Noise Simulation Scope, based on High-Fidelity CFD
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- SKU # : 75_2019_0223_KeBler
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Expanding Helicopter Noise Simulation Scope, based on High-Fidelity CFD
Authors / Details: Manuel KeBler, University of StuttgartAbstract
Based on a previous high fidelity CFD simulation of descent flight for acoustic evaluation, the two other certificationpoints of takeoff and flyover have been investigated. Selected simulation results are compared to flight test data andamong each other, investigating commonalities as well as deviations. Special consideration was given to the separateanalysis of blade harmonics and broadband noise, expecting the latter to be less accessible to CFD. However, theaccuracy of results varies for both shares, ranging from excellent to leaving room for considerable improvement. Anold empirical model for broadband noise did not deliver the upgrade hoped for. For takeoff, an alternative data setwith a slightly different, but equally plausible trim condition was analyzed, resulting in a rough sensitivity estimate.Summing up, acoustic evaluation of high fidelity CFD can give valuable qualitative information, and in some, albeitnot all, cases match flight tests and parameter dependencies also quantitatively.
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Expanding Helicopter Noise Simulation Scope, based on High-Fidelity CFD
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