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Fatigue of an aluminium coated single crystal nickel-base SuperalloyTotemeier, Terry Craig January 1994 (has links)
No description available.
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The analysis and design methods for turbomachinery flowsTsay, W. C. January 1989 (has links)
No description available.
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An investigation of particle trajectories and particle impact points in turbine film cooling hole systemKuk, Victor H. M. January 1995 (has links)
No description available.
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An experimental and theoretical investigation of slot injection and flow separationO'Malley, Kathryn January 1988 (has links)
No description available.
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Assessment of Reliablity Against Corrision Fatigue Failure for Low Pressure Turbine Blades under Unbanlanced Power System OperationChen, Wen-Chih 27 June 2000 (has links)
Usually, a large steam turbine-generator unit has itself a blade vibration mode that is close to its double electrical frequency. This mode of vibration will easily be excited by electrical load unbalance, thereby the turbine blades will be affected by this kind of vibrations, especially for the last three rows of blades. In fact, turbine generators operate in corrosive environment and undergo the statistical stress impact due to the randomly unbalanced currents. In this paper, the blades are subjected to corrosion fatigue, thereby small stress still may cause damage significantly. On the other hand, the damage caused by system unbalance is so small that people could neglect it usually. Nevertheless, for the long-term operation with lasting system unbalance, its influence on reliability may no longer be omitted.
According to the gamma distribution in unbalanced negative phase current (I2), the probability level of fatigue life, the reliability against fatigue failure and crack growth of turbine blades are evaluated for three turbine-generator system in the paper. The blades with various materials, safety factors and stress concentration factors are considered in the simulations. The influence of extreme value distribution of I2 to the reliability is also investigated. According to the results, we have reason to believe that corrosion fatigue is one of causes that led to crack initiation or damage of blades under normal operation.
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Flow between contra-rotating discsKilic, Muhsin January 1993 (has links)
No description available.
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The mechanical properties of aluminide coatingsChien, H. H. January 1989 (has links)
No description available.
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Effects of wake and shock passing on the heat transfer to a film cooled transonic turbine bladeRigby, M. J. January 1990 (has links)
No description available.
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Heat Transfer in Smooth and Ribbed Rectangular Two-Pass Channels with a Developing Flow Entrance at High Rotation NumbersHuh, Michael 16 January 2010 (has links)
Cooling channels with a developing flow entrance condition and aspect ratios of
1:4 and 2:1 were studied. The range of the rotation number and buoyancy parameter for
the selected AR channels was extended. The maximum Ro and Bo for the 1:4 channel
was 0.67 and 1.9, respectively. For the 2:1 channel, these values were 0.45 and 0.85,
respectively.
The effect of rib spacing and rib height on heat transfer in the 1:4 channel is
investigated. Three rib spacing configurations were considered: P/e=2.5, 5, 10 with a
constant e/Dh ratio of 0.078. To investigate the effect of rib height, a rib configuration
with an e/Dh ratio of 0.156 and P/e ratio of 10 was considered. For the 2:1 channel, a
smooth channel surface condition was studied. For each channel aspect ratio and surface
condition, five Reynolds numbers were studied up to 40K. At each Re, five rotational
speeds are considered up to 400 rpm.
The results of this research work indicate that rotation can cause a significant
increase in heat transfer on the first pass trailing surface of both aspect ratio channels. The leading surface in ribbed channels has shown a dramatic decrease in heat transfer
with rotation in the first pass. Reductions in heat transfer by as much as 50% were
observed. In the second pass, the leading and trailing surfaces with ribs showed very
similar effects of rotation. Also, the effect of rotation seems to vary with the rib spacing.
The strength of rotation showed to be greater in the tight rib spacing of P/e=2.5. The rib
height in the 1:4 channel had minimal impact due to the large distance between the
leading and trailing surfaces. The tip cap heat transfer for both channels showed large
increases with rotation. This is very beneficial since tip cooling is an important part of
maintaining the life a turbine blade. Finally, the buoyancy parameter proved to be very
useful in predicting heat transfer in rotating conditions. The correlations developed
showed very acceptable accuracy when compared to the experimental data.
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End-wall skin friction and secondary flow losses downstrean of a turbine blade cascadeBoumedmed, Abdelkader January 1989 (has links)
No description available.
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