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The impingement of sonic and sub-sonic jets onto a flat plate at inclined angles |
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| Authors: | Jim Crafton Campbell Carter Greg Elliott John Sullivan |
| Institution: | (1) Innovative Scientific Solutions, Inc., 2766 Indian Ripple Road, Dayton, OH 45440, USA;(2) Air Force Research Laboratory, Bldg 18, 1950 Fifth St., Wright Patterson Air Force Base, Dayton, OH 45433-7251, USA;(3) Aerospace Engineering, University of Illinois, 306 Talbot Laboratory, 104 South Wright Street, Urbanat, IL 61801, USA;(4) Purdue University, 500 Central Drive, Potter Room 326, West Lafayette, IN 47907-2022, USA |
| Abstract: | The flow field associated with a jet impinging onto a surface at an inclined angle is investigated using particle image velocimetry (PIV). The results indicate that as a free jet impinges on a flat surface at an inclined angle the jet is turned by and spread laterally onto the impingement surface. The impingement angle of the jet is the dominant parameter in determining the rate of turning/spreading for the jet. The stagnation point is located using the PIV data and is found upstream of the geometric impingement point and upstream of the location of maximum pressure. The location of the stagnation point is a strong function of impingement angle and a weak function of impingement distance and pressure ratio. The location of the stagnation point is compared with the location of maximum pressure and compared to a curve fit for the location of maximum pressure based an exact solution of the Navier–Stokes equations for a non-orthogonal stagnation flow. |
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