Accession Number : AD0696602

Title :   ON THE PROBLEM OF CORRECTING TWISTED TURBINE BLADES,

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Gogolev,I. G. ; Dyakonov,R. I. ; Kuzmichev,R. V.

Report Date : 24 MAR 1969

Pagination or Media Count : 12

Abstract : A series of studies on steam and gas turbines with blades twisted according to a specific relationship were tested at a given blade aspect ratio. Some of the models were made with shrouded and shroudless rotor blades and with a sealing ring, and in some cases, cylindrical guide vanes were used. The investigation results for some stages are plotted using graphs to represent the variation in the experimental and calculated values of the degree of reaction and angle at various ratios. This distribution of the parameters along the blade height is caused mainly by the secondary flow and the overflow of the working substance in the axial and radial clearances near the transverse flow boundary. Consequently, negative angles of attack are created near the blade root, and positive angles are created at the periphery. These angles of attack increase the stage energy losses and reduce its efficiency. Improper angles of attack can reduce stage efficiency by approximately 0.5 percent. The relation of the degree of reaction and the angles of attack is shown in the appropriate figure in the text. The rotor blade correction method is discussed.

Descriptors :   (*TURBINE BLADES, DESIGN), GAS TURBINES, STEAM TURBINES, BLADE AIRFOILS, ASPECT RATIO, FLUID DYNAMICS, SECONDARY FLOW, ANGLE OF ATTACK, INLET GUIDE VANES, CORRECTIONS, PERFORMANCE(ENGINEERING), OPTIMIZATION, USSR

Subject Categories : Non-electrical Energy Conversion
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE