The results reported concern the influence of some constructional parameters on the stage efficiency and the flow pattern.

The influence of the outlet diffuser form (Fig. 3) on the stage efficiency was examined. It was established that this efficiency can be increased by 3 percent as compared to the design without a diffuser (Fig. a), if appropriately formed diffuser was used. Additional guiding vanes in the cascade (Fig. 3) can further increase the efficiency by 2 percent. 

The angle of untwisting of the rotor blades was calculated and compared with the experiment. It was shown that centrifugal forces have the major influence on this effect. Relatively high values of the mentioned angles (about 9^o) cause changes of the flow rate and flow pattern along the blades and a subsequent efficiency drop. Shrouding of the rotor blading at tips (Fig. 6) was proposed as a preventive measure. Its influence upon the flow pattern at the outlet of the stage and upon the efficiency (about 3 peTcent increase) has been shown in Figs. 7 and 8.

The form of the outer contour of the final stage flow part was optimized from the view-point of the stage efficiency (Figs. 9 and 10).

The influence of the moisture at the final stage outlet on the efficiency was examined (Figs. 11 and 12). It was shown that about 0.3 percent efficiency drop is caused by about 1 percent increase of the moisture.