NDLI: Control valves and cascades for the first stages of turbines with ultrasupercritical steam parameters

Content Provider	Springer Nature Link
Author	Zaryankin, A. E. Rogalev, N. D. Rogalev, A. N. Garanin, I. V. Osipov, S. K. Grigoriev, E. Yu.
Copyright Year	2016
Abstract	This paper considers the problems that will unavoidably be encountered in the creation of new-generation turbines operated at ultrasupercritical initial steam parameters, namely, the development of new control and shutoff valves, the reduction of end energy losses in blade cascades and steam leaks in high-pressure cylinders (HPCs), the elimination of effect produced by regenerative steam bleedoffs on the afterextraction stage, the cooling of a blade cascade, etc. Some possible solutions are given for the two first of the listed problems. The conclusion about the need for the transition to new-generation control valves in the development of new advanced steam turbines with ultrasupercritical initial steam parameters has been made. From the viewpoint of their design, the considered new-generation valves differ from the known contemporary constructions by a shaped axially symmetric confusor channel and perforated zones on the streamlined spool surface and the inlet diffuser saddle part. The analysis of the vibration behavior of new-generation valves has demonstrated a decrease in the dynamic loads acting on their stems. To reduce the end energy losses in nozzle or blade cascades with small aspect ratios, it is proposed to use finned shrouds in the interblade channels. The cross section of fins has a triangular profile, and their height must be comparable with the thickness of the boundary layer in the outlet cross section of a cascade and, provisionally, be smaller than 8% of the cascade chord.
Starting Page	422
Ending Page	429
Page Count	8
File Format	PDF
ISSN	00406015
Journal	Thermal Engineering
Volume Number	63
Issue Number	6
e-ISSN	15556301
Language	English
Publisher	Pleiades Publishing
Publisher Date	2016-05-24
Publisher Place	Moscow
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	control valve profile cascades end losses blade cascade pressure vibration Engineering Thermodynamics, Heat and Mass Transfer
Content Type	Text
Resource Type	Article
Subject	Energy Engineering and Power Technology Nuclear Energy and Engineering

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