Experimental studies of polydispersed wet steam flows in a turbine blade cascade

Abstract

The paper describes experimental studies of water droplet motion in turbine cascades using laser diagnostic techniques (particle image velocimetry/particle tracking velocimetry). The investigations were performed at the experimental installation Wet Steam Circuit – 2 (WSC-2) at the Moscow Power Engineering Institute. The facility allows the study of the flow of superheated, saturated and wet steam over a broad range of velocities. The effect of the steam initial conditions on the behaviour of the coarse droplets downstream of a nozzle blade cascade has been studied for subsonic and supersonic flow. The variation of the average droplet velocities and angles across the blade pitch, and the droplet trajectories have been obtained. The relationship between the slip coefficients of droplets having minimal velocities in the blade trailing-edge plane, the initial steam wetness, and the axial distance downstream of the nozzle blade are suggested as the criteria characterising the coarse droplet motion downstream of the cascade.

Turbine blade profile design method using Bezier curves

“…It is remarkable that some droplets (1b) have very high exit angles and they cross the trailing wake downstream of the blade. This confirms previous results about droplets streams distribution downstream the turbine blades (Fillipov et al, 2014;Gribin et al, 2015b). The estimation of droplets diameters in 1b and 2b streams was made in (Gribin et al, 2016).…”

“…It should be noted that the formation and movement of the liquid phase particles (except of group I in Fig. 1) is virtually impossible to model, because a lot of factors must be taken into consideration for its mathematical description (Fillipov et al, 2014;Gribin et al, 2015a): the parameters distribution of the main flow, the film flow conditions, wave structure on the film surface, and so on.…”

Aerothermodynamic Effects and Modeling of the Tangential Curvature of Guide Vanes in an Axial Turbine Stage

“…Vanes with High Curvature. The numerically investigated vanes with high curvature on both ends produce high underturning in the sidewall zones, which cannot be described by a correction approximately proportional to as in (23). A nonlinear version for the correction parameter has been devised, which makes use of several additional parameters…”

“…The research work of the flow in axial turbine stages with curved stator blades is therefore an important research topic for actual turbomachinery and aeroengines. And some results of the curvature blades can be found in Deich et al [7][8][9]; Filippov and Wang [17,18]; Wanjin et al [11]; Harrison [12]; Hourmouziadis and Hübner [13]; Jiang et al [19]; Vogt and Zippel [20]; Wang and Zheng [21]; Wolf and Romanov [22], an experiment research, and Filippov et al [18,23]; Hourmouziadis and Hübner [13]; Jiang et al [19]; Pioske and Gallus [16]; Suslov and Filippov [14]; Wang and Zheng [21], a numerical research, where the curvature form of such researches is however mostly a simple curvature (circle) form.…”

Features of liquid phase movement in the inter-blade channel of nozzle blade cascade

“…It should be noted that the formation and movement of the liquid phase particles (except of group I in Figure 2) is virtually impossible to model, because a lot of factors must be taken into consideration for its mathematical description: [10][11][12][13] the parameters distribution of the main flow, the film flow conditions, wave structure on the film surface, and so on.…”