Chapter – Swept Boundary Layer Transition Experimental Results
Swept boundary layer transition
... identical results will be ...inflow boundary conditions on numerical simulations, which solve some form of the Navier- Stokes equations, utilise random algorithms to superimpose turbulent structures on the ...
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Direct Numerical Simulation of Transition in a Swept-Wing Boundary Layer
... laminar boundary layer has significantly lower skin friction than a turbulent boundary layer at the same ...delayed boundary-layer transition over major aerodynamic ...
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The Effects of Step Excrescences on Swept-Wing Boundary-Layer Transition
... The lower limit on the altitude band is implemented for safety concerns: the highest obstacle in the test area is approximately 2,000 ft. The higher limit is the highest altitude one can fly at without supplemental ...
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Influence of a Backward-Facing Step on Swept-Wing Boundary-Layer Transition
... Breakdown Results for the largest step height were discussed in detail by Eppink et ...the results for other step ...for transition in the presence of the step because the amplitudes of stationary ...
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Shuttle Return To Flight Experimental Results: Cavity Effects on Boundary Layer Transition
... Test Model Description To support the cavity boundary layer transition testing, cast ceramic models (9.6-inch long from nose to body-flap hinge) were manufactured, all of which share a common ...
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Shuttle Return To Flight Experimental Results: Protuberance Effects on Boundary Layer Transition
... the results are detailed in Ref. 8. Discrete roughness transition effects were obtained in all three LAL facilities based on the existing Reynolds number capability of the tunnel and the range of trip ...
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Shuttle Damage/Repair from the Perspective of Hypersonic Boundary Layer Transition - Experimental Results
... the boundary layer (laminar, transitional, or ...of transition onset behind a protuberance to be identified and the progressive movement towards the roughness site to be ...alone, transition ...
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Experimental investigation of induced supersonic boundary layer transition
... Figure 4.28 shows, for the clean insert configuration, the comparison be- tween the spectrograms of the most upstream thin film along the insert. The top plot is the spectrogram of the signal from the test without ...
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Sensitivity of Swept-Wing, Boundary-Layer Transition to Spanwise-Periodic Discrete Roughness Elements
... Once the front is detected, 20 consecutive processed images, at the same experimental condition, are averaged together to obtain a single quantifiable transition front location. This is done by producing a ...
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Experimental and theoretical study of swept-wing boundary-layer instabilities: Unsteady crossflow instability
... the boundary layer were examined by means of a hot-wire ...The results of these measurements provided important information about compliance with the infinite- swept wing condition at large ...
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Experimental analysis of suction on step-induced boundary-layer transition
... All results obtained with the smooth and step-2 con- 435 figurations are collected in figure 10a and 10b, respec- ...the transition Reynolds number is plotted against the Hartree parameter β H ...
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The Effect of Backward-Facing Step Height on Instability Growth and Breakdown in Swept Wing Boundary-Layer Transition
... δ boundary layer thickness, mm ...on boundary-layer transition so that appropriate manufacturing tolerances can be specified for wing designs with laminar-flow ...on transition ...
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Scenarios of Swept-wing Boundary-layer Transition in Presence of Various Kinds of Freestream Turbulence and Surface Roughnesses
... detailed experimental investigation of scenarios of the laminar-turbulent transition occurred in 3D boundary layers developing on models of 25- and 35-degree swept wings in presence of various ...
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Experimental Investigation of the Effect of Forward-facing Steps on Boundary Layer Transition
... TSP results in ...laminar boundary layer more unstable and led to a displacement of the transition location to a more upstream position: from x T,0 /c ~ 75 % for the smooth configuration (no ...
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Stability of an infinite swept wing boundary layer with surface waviness
... draw results, while the dotted horizontal line in each subplot depicts the transition location corresponding to the non- deformed swept wing ...of transition. Further, results indicate ...
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DNS of Laminar-Turbulent Transition in Swept-Wing Boundary Layers
... the experimental observations at DLR for a transition triggered by a secondary high- frequency instability (Bippes ...of transition approximately coincides with the peak location of the modal ...
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Morphing wing : experimental boundary layer transition determination and wing vibrations measurements and analysis
... turbulent boundary layer transition ...the experimental tests in the IAR- NRC wind tunnel relied on the validation of the numerical ...accurate experimental characterization of the ...
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Boundary layer transition over rotating disks
... the transition of the rotating–disk boundary–layer flow need to be studied carefully when the flow domain has a finite size, the water–based experimental facility can still be used in order to ...
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Infrared thermography for boundary layer transition measurements
... the transition position is in front of a given pres- sure sensor for some cycles but behind the sensor for the other ...the transition affects the BL dis- placement ...BL transition and the BL ...
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Roughness Induced Transition in a Supersonic Boundary Layer
... the results in log-scale and Fig. 14(b) shows the results in linear ...The results show that the disturbances along the centerline first decrease past the roughness until x ~ 55 mm and reach the ...
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