Abstract
In this study, the impact of laser energy deposition on pressure oscillations and relative sound pressure levels (SPL) in an open supersonic cavity flow is investigated. Laser energy with a magnitude of 100 mJ is deposited on the flow just above the cavity leading edge and up to 7 dB of reduction is obtained in the SPL values along the cavity back wall. Additionally, proper orthogonal decomposition (POD) method is applied to the x-velocity data obtained as a result of computational fluid dynamics simulations of the flow with laser energy deposition. Laser is numerically modeled using a spherically symmetric temperature distribution. By using the POD results, the effects of laser energy on the flow mechanism are presented. A one-dimensional POD methodology is applied to the surface pressure data to obtain critical locations for the placement of sensors for real time flow control applications.
Highlights
Cavity configuration is an important configuration for real life applications of aeronautics and it is one of the vital problems of air vehicles which carry stores internally
Proper orthogonal decomposition (POD) method is applied to the x-velocity data obtained as a result of computational fluid dynamics simulations of the flow with laser energy deposition
This study aims to show the effects of laser energy deposition on an open cavity flow with length to depth (L/D) ratio of 5.07 and impacts of laser are shown using proper orthogonal decomposition (POD) results
Summary
Cavity configuration is an important configuration for real life applications of aeronautics and it is one of the vital problems of air vehicles which carry stores internally. When air vehicles release the stores from their internal carriages at supersonic speeds, a turbulent, three-dimensional flow occurs over the cavity with problems such as pressure fluctuations and relatively high sound pressure levels. The control of supersonic cavity flows is crucial. An important study of Aradag [1] includes the cavity configuration with a length to depth (L/D) ratio of 5.07. The complexity of the cavity flow is presented with CFD results. Ayli [2] performed CFD simulations of cavity configurations with different L/D ratios. Pressure oscillations and sound pressure level (SPL) distributions in specific regions of the cavity are presented
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