傾斜衝突する軸対称空気噴流の平板上の挙動

概要

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The oil film flow visualization was used to observe the flow behavior of an axisymmetric air jet impinging obliquely on a flat plate. When observed in detail the oil-flow pattern, a small point of oil film was found to be remained maintaining the original film state. Therefore, the point might be defined to be the stagnation point (O_s) and it was thought to be the very point of the maximum wall pressure (O_p). Contrary to our thought, it was found that the stagnation point was quite far up-stream of the maximum wall pressure location when the axisymmetric jet was impinged obliquely with shallow angle. To confirm this unexpected phenomenon both experimentally and analytically, the velocity distributions in the impingement region of the obliquely impinging jet, particularly near the plate, are measured by a Laser Doppler Velocimeter and, furthermore, a two-dimensional jet impinged obliquely on the plate surface is also analysed numerically. Consequently, the above phenomenon for axisymmetric jet impinging obliquely is proved postitively by the LDV measurements of velocity distributions on the symmetrical plane and by the numerical computations for the two-dimensional jet using a viscous incompressible flow model.
東海大学の論文