1、APRIL 1996 Errata to ASME PTC 6s REPORT-1988 (R 1995) The Errata corrections listed below apply to ASME PTC 6.5 Report- 1988 (R 1995). hocedures for Routine Performance Tests of Steam Turbines. Page Location Change 8 Fig. 2.1 Figures 2.lb) and 3.1(c) reversed without switching the subcaptions. 50 Eq
2、. 5 Equation corrected. THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS 345 East 47th Street, New York, N.Y. 10017 D4288E ASME PTC 6s REPORT- 1988 c I l t. PROCEDURES FOR ROUTINE PERFORMANCE TESTS OF STEAM TURBINES 135 la) Turbinas Opsrating Pidominantly in tha Supihaand-Stem Region ,- - % 1 / / / A 6
3、L S bl Temperature-Entropy Diagram Without Rehiat - -. / . / / L S (e) TemperitureEntropy Diigram With R.cun b) and IC Turbines Operating Predominantly in the Wet-Steam Region earef FIG. 2.1 TEMPERATURE-ENTROPY DIAGRAMS 8 ASME PTC 6s REPORT-1988 or, From equation ot continuity: PROCEDURES FOR ROUTIN
4、E PERFORMANCE TESTS OF STEAM TURBINES (bi Derivation of Eq. (5): htaximum flow rate oi a nozzle is: and since. Mass flow rate is written, The maximum value can be found by diiie:entiating w with respect to 5 and setting the derivative equal P. (lhi to zero; thus, I Y-;1 Equation (1 j) represents the
5、 insentropic flow rate. For an actual ilow rate, a nozzle coefiicient C, is applied. Theretore, r2 -, . ;1 -, - -I -. -j-1 p, Y -f(;) -(:) i =o - 1 crit (c) Derivations of Eqs. (6) and (7): For an isentropic process, pvy = consrant Differentiating it with respect to v, d dv -Ipv-fi =o where - dP is the bulk modulus of compression dv - V 50
