Modeling the Response from a Cascade to an Upstream Acoustic Disturbance
Time-accurate Euler simulations for the flow through a two-dimensional cascade subjected to an upstream acoustic disturbance were used as the basis for a small-disturbance model to predict the reflected response upstream of the cascade. The small-disturbance model results in a linear system of algeb...
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Veröffentlicht in: | AIAA journal 2000-08, Vol.38 (8), p.1322-1330 |
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description | Time-accurate Euler simulations for the flow through a two-dimensional cascade subjected to an upstream acoustic disturbance were used as the basis for a small-disturbance model to predict the reflected response upstream of the cascade. The small-disturbance model results in a linear system of algebraic equations for the properties of the reflected and transmitted disturbances. The model predicts the reflected and transmitted responses as a function of the cascade blade geometry, the disturbance amplitude, and the initial flow properties. A new characteristic outflow boundary condition based on the small-disturbance response model was formulated and demonstrated independently in two one-dimensional Euler codes. The new boundary condition was found to provide a significant improvement in accuracy for the reflection response of an acoustic disturbance from a compressor relative to existing outflow boundary-condition models. |
doi_str_mv | 10.2514/2.1131 |
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The small-disturbance model results in a linear system of algebraic equations for the properties of the reflected and transmitted disturbances. The model predicts the reflected and transmitted responses as a function of the cascade blade geometry, the disturbance amplitude, and the initial flow properties. A new characteristic outflow boundary condition based on the small-disturbance response model was formulated and demonstrated independently in two one-dimensional Euler codes. 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The small-disturbance model results in a linear system of algebraic equations for the properties of the reflected and transmitted disturbances. The model predicts the reflected and transmitted responses as a function of the cascade blade geometry, the disturbance amplitude, and the initial flow properties. A new characteristic outflow boundary condition based on the small-disturbance response model was formulated and demonstrated independently in two one-dimensional Euler codes. The new boundary condition was found to provide a significant improvement in accuracy for the reflection response of an acoustic disturbance from a compressor relative to existing outflow boundary-condition models.</abstract><cop>Reston, VA</cop><pub>American Institute of Aeronautics and Astronautics</pub><doi>10.2514/2.1131</doi><tpages>9</tpages></addata></record> |
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subjects | Acoustic wave reflection Acoustic wave transmission Acoustics Aerodynamics Aircraft Algebra Applied fluid mechanics Boundary conditions Cascades (fluid mechanics) Computer simulation Exact sciences and technology Fluid dynamics Fundamental areas of phenomenology (including applications) Hydraulic and pneumatic machinery Physics Supersonic aerodynamics Supersonic aircraft |
title | Modeling the Response from a Cascade to an Upstream Acoustic Disturbance |
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