Investigation of Sand Blocking Within Impingement and Film-Cooling Holes
Gas turbines are not generally designed for operation with a particle laden inlet flow but, in fact, are commonly operated in unclean environments resulting in dirt, sand, and other debris ingestion. ...
Gas turbines are not generally designed for operation with a particle laden inlet flow but, in fact, are commonly operated in unclean environments resulting in dirt, sand, and other debris ingestion. ...
Effects of Suction and Injection Purge-Flow on the Secondary Flow Structures of a High-Work Turbine
J. Turbomach. -- April 2010 -- Volume 132, Issue 2, 021021 (8 pages)
doi:10.1115/1.4000485
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In high-pressure turbines, a small amount of air is ejected at the hub rim seal to cool and prevent the ingestion of hot gases into the cavity between the stator and the disk. This paper presents an experimental study of the flow mechanisms that are associated with injection through the hub rim seal at the rotor inlet. Two different injection rates are investigated: nominal sucking of −0.14% of the main massflow and nominal blowing of 0.9%. This investigation is executed on a one-and-1/2-stage axial turbine. The results shown here come from unsteady and steady measurements, which have been acquired upstream and downstream of the rotor. The paper gives a detailed analysis of the changing secondary flow field, as well as unsteady interactions associated with the injection. The injection of fluid causes a very different and generally more unsteady flow field at the rotor exit near the hub. The injection causes the turbine efficiency to deteriorate by about 0.6%.
©2010 American Society of Mechanical Engineers
| History: | Received 20 August 2008; revised 29 August 2008; published 21 January 2010 | |
| doi: | http://dx.doi.org/10.1115/1.4000485 | |
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