POLIFENOLES Y FENOLES

The presented investigations lend strong evidence to the validity of vortex generator use as a flow control method in supersonic inlets. The fact that micro-vortex generators have the ability to reduce SWBLI separation and improve the boundary layer characteristics both downstream and through a shock and subsonic diffuser supports the use of vortex generators as a form of inlet flow control, possibly replacing or augmenting currently used forms of control such as bleed. However, a greater understanding of micro-vortex generator design corresponding to specific supersonic inlets that are tailored to their use is required for full utilization and minimization of the positive and negative effects, respectively.

Future investigations should further examine the unsteady aspects of normal shock wave/boundary layer interactions and micro-vortex generator flow control. Depending on the shock wave location and inlet geometry, the vortex generators have the potential to increase shock wave oscillations. The relationship of the shock placement and shape relative to the geometric throat of the inlet should be more methodically investigated and understood with vortex generator control in order to minimize

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unsteadiness. The historical literature on normal shock wave/boundary-layer interactions is extensive, focusing on time-averaged measurements, but the more recent fundamental studies on SWBLI structure and unsteadiness, utilizing modern techniques such as tomographic PIV and LES/DNS numerical methods, have focused on impinging oblique and compression ramp shock waves rather than normal shock waves. It is true that the large amplitude fluctuations of normal shocks due to the subsonic downstream flow offer a challenging problem. Utilization of a downstream throat and/or splitter plate is likely needed to stabilize the normal shock in small-scale facilities along with the use of high-speed measurements such as high-speed PSP and schlieren to correlate shock structure and pressure distribution through a normal SWBLI.

Additional diagnostic techniques such as tomographic PIV are needed to understand MVG vortex structure and its interaction with SWBLIs. Continued development of skin friction measurement techniques such as Surface Stress Sensitive Film (S3F) are critical in the analysis of MVGs where a deeper understanding of streamwise vortex strength, wake velocity deficit, and vortex spacing versus the effects of upwash and downwash are needed. It will be important to minimize the response time of the S3F method while using another simultaneous diagnostic such as schlieren photography to pinpoint shock location. Control of side wall effects should also be considered with methods other than bleed, which may inadvertently affect the centerline flowfield. The use of chamfered corners has not yet been examined experimentally and may help provide a greater understanding of the interaction between corner effects and vortex generator control. One simple solution is to use axisymmetric tunnels in the examination of VGs, eliminating one variable entirely and obtaining a fundamental knowledge base of VG flow control on SBLIs prior to reintroducing three-dimensional effects.

In regards to the design of future iterations of camera housings for use in large-scale testing, a recommendation is to intensify the illumination by increasing the number and power of the light-emitting diodes. Another improvement would be to use a camera chip set that can be specifically shaped and modified to best suit the test configuration with minimum size. This would ensure a compact camera housing for the specific needs of the test. It is also recommended to use a camera with as high a frame rate as possible. Other optical techniques such as PIV are possible in these environments, as well, with enough preparation.

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