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Updated: Jul 2, 2025

An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids
Published on: December 4, 2017
Extension of Doak's momentum potential theory for multi-species and reacting flows
Raffaele D'Aniello1, Mario Casel2, Karsten Knobloch2
1Institute of Propulsion Technology-Engine Acoustics, German Aerospace Center (DLR), Berlin 10625, Germany.
Abstract:
This work extends Doak's momentum potential theory to multi-chemical-component and reactive, time-stationary fluctuating flows. Additional mixture-related components are found to be superimposed on the canonical vortical, acoustic, and thermal parts of momentum fluctuations and total fluctuating enthalpy. These extended relations are used to develop a time-averaged model that relates the acoustic power radiated to the far-field with clearly defined vortical, acoustic, thermal, and compositional near-field sources. The resulting model is designed to offer a more general and comprehensive way to describe the noise generated within combustion chambers.
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