Patent ID: 6270315
Filing Date: 2001-08-07
Classification: F01D,Y10S

Abstract:
A turbine having at least one essentially axial-flow stage, which stage consists of a guide-blade row (LE) and a moving-blade row (LA), which are accommodated in a common casing (30) , which casing has at least one inflow section (31) and at least one outflow section (32), and furthermore the degree of reaction of a stage being greater than 0.15, wherein, for a turbine part which lies between an inflow section (31) and an outflow section (32) of the casing (30), for the essentially axial-flow blade rows (LE, LA), the ratio of their axial chord length (s.sub.ax) to their height (h) is selected in such a way that a characteristic factor RBL is greater than 1, RBL being defined by ##EQU9##in which calculation specificationp [W]=output of the turbinep [Pa]=arithmetic mean between inlet pressure and outlet pressure of the turbinez [-]=number of stagesm [kg/s]=mass flow of the working medium which flows through the turbineN [1/s]=rotational speedh.sub.i [m]=blade height of a blade of the blade row i, measured on the outflow side of the bladeD.sub.m,i [m]=mean value of hub outside diameter and casing inside diameter, measured on the outflow side of a blade of the blade row iS.sub.ax,i [m]=axial chord length of a blade of the blade row i, measured at the point of maximum axial chord length.