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Aerodynamic Research on the Midsection of a Long Turbine Blade

Šimurda D., Luxa M., Šafařík P., Synáč J.

TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk

2008

Vol. 12, No 3-4

135-145

The paper is concerned with experimental aerodynamic research on the midsection of a 1220mm long turbine rotor blade. Optical as well as pneumatic measurements of the midsection blade cascade have been performed in a suction type high-speed wind tunnel. The results of measurements are analyzed and discussed. Interferograms and schlieren pictures taken in a wide range of isentropic exit Mach numbers and incidence angles exhibit the existence of several phenomena occurring in the transonic flow field at certain conditions concerning the exit Mach number and the angle of incidence. A flow separation taking place at an extreme negative incidence has been found to produce an additional loss of 6%. The presence of the reflection of an exit shock wave on the suction side of the neighbouring profile has been found to have a substantial influence on the losses, since the loss coefficient value has increased about 10% in cases without the reflection, i.e. the cases at a high exit Mach number and a high positive angle of incidence. Several reflection types have been observed and described.

Calculations of the condensing water steam flows in turbine blade cascades

Wróblewski W.

Turbulence : international journal

2000

Vol. 6-7

209-223

This paper describes modelling of two- and three-dimensional flows with homogeneous condensation. It needs a simultaneous solution of a differential governing equations (continuity, momentum and energy- equations) and differential equation of condensate formation. It was assumed that flow is inviscid, the velocity slip between the vapour and liquid droplets is neglected. The formation of the liquid phase is calculated using classical nucleation theory. Superheated and subcooled steam parameters are computed from a virial non-linear equation of state. The influence of correction methods and droplet growth models is discussed. The finite volume cell centred calculation method is used. The solution procedure is based on the upwind Godunov-type scheme adapted to the real gas problems. Presented algorithm is capable to investigate unsteady condensation phenomena in the flow. The computational results of the two-phase flow modelling with condensation through a turbine cascade are presented. For the turbine stator of the steam turbine the 3-D flow structure is described.