Nonlinear acoustic theoretical model considering acoustic transmissivity in the interior of a real fluid object
Résumé
The present study aims to analyze the response of a fluid system to high-level acoustic pressure fluctuations in Liquid Rocket Engine-like conditions. Propellants are usually in a trans-or super-critical phase during steady-state operative conditions of such engines, which requires special attention to the properties of the fluid. A semi-analitic model is developed to study the interaction between acoustics and an object with properties ranging from subcritical to supercritical conditions. A particular attention is paid on the acoustic response of the injected fluid that is usually considered as perfectly reflective in sub-critical conditions but where acoustic transmitivity has to be considered in trans-and supercritical conditions. This model consists in the description of both the external velocity potential field (described as the superposition of the incident standing velocity potential field and scattered associated fields) and the velocity potential field inside the object. The first results from this model are presented for a particular condition typical of engine thermodynamic working conditions. The importance of taking into account acoustic transmission in the fluid is shown.
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