The influence of endwall contouring on the performance of a turbine nozzle guide vane
- Politecnico di Milano (Italy). Dipt. di Energetica
- Univ. di Bergamo, Dalmine (Italy). Facolta di Ingegneria
The paper presents the results of a detailed investigation of the flow field in a gas turbine linear cascade. A comparison between a contoured and a planar configuration of the same cascade has been performed, and differences in the three-dimensional flow field are here analyzed and discussed. The flow evolution downstream of the trailing edge was surveyed by means of probe traversing while a three-dimensional Navier-Stokes solver was employed to obtain information on flow structures inside the vaned passages. The experimental measurements and the numerical simulation of the three-dimensional flow field have been performed for two cascades; one with planar endwalls, and the other with one planar and one profiled endwall, so as to present a reduction of the nozzle height. The investigation was carried out at an isentropic downstream Mach number of 0.6. Airfoils of both cascades were scaled from the same high-pressure gas turbine inlet guide vane. Measurements of the three-dimensional flow field have been performed on five planes downstream of the cascades by means of a miniaturized five-hole pressure probe. The analysis of mass-averaged losses shows a significant performance improvement in the contoured cascade. This can be ascribed not only to lower secondary losses but also to a reduction of the profile losses.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 351616
- Report Number(s):
- CONF-980615-; ISSN 0889-504X; TRN: IM9927%%141
- Journal Information:
- Journal of Turbomachinery, Vol. 121, Issue 2; Conference: American Society of Mechanical Engineers (ASME) turbo expo `98 - land, sea, air, Stockholm (Sweden), 2-5 Jun 1998; Other Information: PBD: Apr 1999
- Country of Publication:
- United States
- Language:
- English
Similar Records
Thermal power plant upgrade via a rotating detonation combustor and retrofitted turbine with optimized endwalls
Investigation of the flow field downstream of a turbine trailing edge cooled nozzle guide vane