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Image Caption
3-D views of the mainstream flows, without shroud leakage. These show contours of entropy on the blade surfaces and in the wakes, with streaklines introduced at the stator/rotor interface very near the hub wall. Clearly visible are the locations of the strong shock waves on the suction surfaces, and the rotor wakes downstream. Secondary flows are evidenced by the larger "blobs" of entropy in the wakes, also highlighted by the streaklines. This shows that the shroud leakage clearly dominates the flow features immediately downstream of the stage.
  
From:
Application: Improving Understanding of Turbine Shroud Losses
Posted Tue June 04, 2002 @02:26PM
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Application by Paul Roach, ALSTOM Power UK Ltd.

A world-leading supplier to the energy market, ALSTOM offers its customers a comprehensive range of power generation solutions from turnkey power plants to gas-, steam- and hydro-turbines, generators and boilers. Gas turbine design and manufacture has been undertaken at Alstom's Lincoln site since the late 1940ís, with engine ratings up to the 13MW Cyclone introduced in 1997.

To help maximize powerplant efficiency, the Company uses state-of-the-art CFD methods to design compressor and turbine blading. In addition to in-house software, ALSTOM has also been making use of CFX-TASCflow in the last few years. To date, its main use in the Turbine Department has been to examine secondary and parasitic gas flows, such as can occur in blade cooling passages.

( Read Full Article )


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