By Ed Barthelmes, Richard S. Dann
Background of the main flexible unmarried engine propeller a/c each equipped. presents in-depth insurance of all variations either within & out. Over eighty B&W photographs plus 34 pgs of colour pictures & four pgs of colour profiles. eighty pages.
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For the numerical investigations the same fully detailed vehicle model was simulated. The investigations are based on the RANS simulations carried out by Vdovin et al. 04. 3. For the study of the flow pattern, limiting streamlines were calculated, using the function provided in Ensight. The velocity values at a wall distance of 1mm are projected onto the surface to display the limiting streamlines. In both, CFD and experiment, the investigations were done at a velocity of 100 km/h. In Figure 3 the measured and calculated pressure distributions are shown for the investigated regions.
Figure 3: Visualization with oil paint at zero yaw angles (grey scales converted to negative). Left: fastback; right: notchback The visualizations using the tufts are considered in Figure 4 for three different yaw angles. At zero yaw the tufts located at the lower part of the rear window of the notchback show a pattern which can be attributed to the presence of a separation bubble. A video of the tufts shows that the asymmetric pattern is unsteady. In contrast to the notchback, the tufts on the rear window of the fastback are well aligned with the main flow direction and do not indicate a separation bubble (although this was assumed in former presentations of the authors ).
An isolated body ∑ − ∑ (1) = ii. a three dimensional body connected to a wall ∑ − ∑ (2) = iii. for a cross plane cutting through a three dimensional body. ∑ + ∑ − ∑ + ∑ =− (3) The here introduced half nodes (N’) and half saddles (S’) occur in the 2D plane where the cross plane cuts through a singular point on the body. To the knowledge of the authors, complete sets of streamlines satisfying these rules have previously only been presented for simple geometries (ellipsoid, body of revolution …). In this work it will be shown that such sets can be obtained on parts of a passenger vehicle with the topological requirements on the singular points satisfied.