Gas Turbine rotor stator rim seal problem was studied by using experimental and CFD method based on a one stage turbine model. Part one focused on the mechanism of ingestion and distribution of ingested flow in rotor stator cavity. The results showed that the non-uniform pressure distribution of annulus flow is the main factor cause hot gas ingestion. The cavity can be well sealed when the pressure in it is higher than that of annulus flow, otherwise the ingestion happens. The tangential velocity of main flow will enhance the ingestion process. The mixing process between sealing flow and ingestion flow happens near the seal clearance and then goes into the lower location of the cavity by the entrainment effect induced by rotor disc. All these factors should be considered and well organized when new and highly efficient rim seal structure is designed.
|Number of pages||5|
|Journal||Journal of Engineering Thermophysics|
|Publication status||Published - May 2014|