Teaching lessons on Manifest Destiny to a middle school social studies class by Kevin J Ryan 1 edition published in in English and held by 1 WorldCat member library worldwide. Three-domensional velocity and concentration measurements of turbulent mixing in discrete hole film cooling flows by Kevin J Ryan 1 edition published in in English and held by 1 WorldCat member library worldwide Magnetic Resonance Velocimetry MRV and Magnetic Resonance Concentration MRC are used to measure the three-dimensional, three-component, time-averaged velocity and scalar concentration fields of ten different discrete hole film cooling configurations.
Seven of these configurations feature variations in the mainstream flow, covering changes in streamwise pressure gradient, incoming boundary layer thickness, and injection wall curvature, as well as a baseline case on a flat wall with nominally zero pressure gradient and moderate boundary layer thickness. All configurations use a single film cooling hole with circular cross-section inclined 30 degrees and aligned with the streamwise direction of the mainstream flow.
The remaining three configurations have nominal mainstream conditions, but include modifications to the film cooling hole to introduce three-dimensional complexity: a skewed film cooling hole, injected at a 30 degrees angle with the mainstream flow; an array of three film cooling holes that interact with one another; and a shaped hole with a non-circular cross-section that diffuses into an expanded exit.
A separate water channel is constructed for each configuration, and each experiment is operated at a nominal blowing ratio of unity.
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The penetration of the jet of fluid from the film cooling hole into the mainstream flow, measurable in both the velocity and concentration fields, is sensitive to the thickness of the mainstream boundary layer at the point of injection. Evidence of this effect is seen in both the boundary layer and pressure gradient cases, with mainstream acceleration and deceleration due to the pressure gradients causing thinning and thickening of the boundary layer.
Mainstream acceleration also strengthens the counter-rotating vortex pair CVP , the dominant secondary flow feature for discrete hole film cooling flows. Increasing the strength of the CVP increases the tortuous path for fluid injected from the film cooling hole, but this effect is partially balanced by the stretching effect of the mainstream acceleration. The distinguishing feature of the skewed hole configuration is the development of a single dominant vortex that remains strong throughout the jet region in the mainstream flow.
This single vortex preferentially entrains low concentration fluid from the mainstream and low velocity, high turbulence fluid from the boundary layer into one side of the jet region, causing asymmetric mixing and spread of the jet concentration and velocity contours.
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Mixing of low concentration fluid under the jet decreases the film cooling performance of the skewed jet as compared to the unskewed baseline geometry. The multihole experiment, having an array of three holes, is oriented with one central downstream hole and two flanking holes on either side upstream. The upstream holes are offset 2D on either side of the center hole, and located 3.
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Bale first caught the public eye at the age of 13, when he was cast in the starring role of Steven Spielberg's Empire of the Sun. He played an English boy who is separated from his parents and subsequently finds himself lost in a Japanese internment camp during World War II. He has Excerpt from book: sir, having Miss Maryon to take care of her; but, you may rely upon it that I will guard them both—-faithful and true. Shirley Hazzard is one of Australia's most significant expatriate authors, and a major international literary figure by any measure.
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