Showing papers in "Journal of Engineering for Power in 1968"
350 citations
TL;DR: Experiments to determine film cooling with air injection through holes into turbulent air boundary layer on flat plate are described in this paper, where a flat plate is used as a flat surface.
Abstract: Experiments to determine film cooling with air injection through holes into turbulent air boundary layer on flat plate
137 citations
TL;DR: In this paper, basic heat transfer and flow friction design data are presented for nine offset rectangular plate-fin surfaces, seven of the test cores were constructed of aluminum and two of stainless steel.
Abstract: : Basic heat transfer and flow friction design data are presented for nine offset rectangular plate-fin surfaces. Seven of the test cores were constructed of aluminum and two were constructed of stainless steel. One of the configurations had a heat transfer area density ratio of 1772 sq ft/cu ft, one of the most compact plate-fin surface ever tested at Stanford University. The present results are compared with the offset rectangular plate-fin surfaces previously tested at Stanford. Comparisons are also provided with a louvered fin and a perforated fin plate-fin surface, in terms of heat transfer power versus flow friction power and flow area characteristics. The various kinds of mal-flow distribution through the test cores and their effects on the test results for heat transfer and flow friction are examined. (Author)
93 citations
88 citations
TL;DR: In this paper, the effect of secondary fluid injection through single nontangential slots on surface heat transfer in regions near the injection site was studied, and experimental results were obtained which cover the range of interest of these parameters for many situations encountered in film cooling applications.
Abstract: A study of the effect of secondary fluid injection through single nontangential slots on the surface heat transfer in regions near the injection site is presented. The nondimensional parameters governing the heat transfer are obtained from the pertinent differential equations, and experimental results were obtained which cover the range of interest of these parameters for many situations encountered in film cooling applications. The experimental heat transfer rates were obtained from a novel transient test facility, and are presented as ratios of the heat transfer obtained with film injection to the heat transfer obtained with only the single mainstream.
62 citations
TL;DR: In this paper, generalized loss correlations for full and partial admission turbines have been derived and compared with recently published data, effects included Reynolds number, blade angles, blade height, blade number, thread trailing edge thickness, tip clearance, and reaction.
Abstract: Generalized loss correlations for full and partial admission turbines have been derived and critically compared with recently published data. Effects included are Reynolds number, blade angles, blade height, blade number, blade trailing edge thickness, tip clearance, and reaction. These generalized loss relationships are for use in optimization of turbines over a wide range of possible operating conditions.
57 citations
TL;DR: In this paper, the influence of variations in flow Reynolds number on the performance of axial compressors has been studied (changes in Reynolds number being, for the most part, achieved by changes in the inlet total pressure at or near the design speed).
Abstract: The influence of variations in flow Reynolds number on the performance of axial compressors has been studied (changes in Reynolds number being, for the most part, achieved by changes in the inlet total pressure at or near the design speed). The measured results, so achieved, have been correlated to show how the main compressor performance parameters vary with Reynolds number. Reference has been made to cascade data to assist in choosing the form of the correlation, which is essentially empirical. A good correlation of the measured performance changes on component tests has been obtained. The method described, therefore, appears to be satisfactory for predicting trends for project assessments and avoids considering the detailed flow changes that occur within the machine as the Reynolds number is varied.
39 citations
28 citations
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19 citations
TL;DR: Little Long Generating Station is located about 500 miles north of Toronto and is one of four plants located close together on the Mattagami River which flows into Hudson Bay (Fig. 1).
Abstract: Little Long Generating Station is situated about 500 miles north of Toronto and is one of four plants located close together on the Mattagami River which flows into Hudson Bay. Some 500 MW of power is transmitted at 500 kv to Sudbury and Toronto (Fig. 1). There are two turbines at Little Long Generating Station. Almost immediately from the time when the first unit was being commissioned and operated under load, field reports referred to what was said to be an abnormally high level of noise and vibration. When the second unit came into service, similar findings were reported. About six months after commissioning, the units were unwatered and a detailed inspection indicated that the stay vanes forming the speed ring contained numerous and serious fatigue cracks. The final diagnosis indicated the damage to be a result of what is now usually referred to as von Karman hydraulic vortexes. Because immediate repairs were required and in order to insure the future structural adequacy of the speed ring, it was decided to change the stay vane profile at the same time, in an attempt to eliminate the excitation due to von Karman vortexes, hoping thereby to avoid further damage of the stay ring after the repairs. Recent inspections of both units show that both the modifications and the final repairs were completely successful.
TL;DR: In this paper, the authors visualize the three-dimensional flow in the impeller and the vaneless diffuser of a centrifugal compressor, using water as the working fluid and streak lines of colored water are photographed and examined.
Abstract: In order to visualize the three-dimensional flow in the impeller and the vaneless diffuser of a centrifugal compressor, water is used as the working fluid and streak lines of colored water are photographed and examined. The test is made at an extremely low speed so that streak lines do not diffuse due to turbulent mixing. The streak lines clearly demonstrate several types of secondary flow, some of which agree with what have been speculated to exist in actual compressors. Most of observed secondary flow patterns are qualitatively understandable with existing theories.
TL;DR: In this article, radioactive sulfur was employed as a tracer to determine the roles of SO2 and SO3 in reactions with these surfaces leading to formation of alkali iron trisulfates.
Abstract: The reactions of SO2 and SO3 with catalytic surfaces containing iron oxides, alone and in combination with various sodium salts, have been investigated. The SO3 concentration gradients above the surfaces were measured using a microprobe technique, showing that, as much as 2000 ppm SO3 can exist in a slowly flowing gas stream immediately next to a surface. Radioactive sulfur was employed as a tracer to determine the roles of SO2 and SO3 in reactions with these surfaces leading to formation of alkali iron trisulfates. These measurements indicated that on a molar basis, SO3 is 30,000 times more reactive than SO2 + O2 in forming complex sulfates with a mixture of sodium sulfate and iron oxide.
TL;DR: In this article, a thin airfoil theory is developed for airfoils spanning a slowly diverging or converging channel, the motivation being to predict, theoretically, the effect of varying axial velocity on the cascade performance of axial flow compressor rows.
Abstract: A thin airfoil theory is developed for airfoils spanning a slowly diverging or converging channel, the motivation being to predict, theoretically, the effect of varying axial velocity on the cascade performance of axial flow compressor rows.
TL;DR: In this paper, the authors emphasize the need for thorough proof testing of gas turbine engines prior to shipboard use and describe some of the gas turbine testing programs in which the U S Navy has been involved and the type of testing that will be required in the future.
Abstract: The author emphasizes the need for thorough proof testing of gas turbine engines prior to shipboard use He describes some of the gas turbine testing programs in which the U S Navy has been involved and the type of testing that will be required in the future