Experimental Research of Pressure Irregularity Within Exhaust Hood Model for Low-Power Steam Turbine

Authors: Sidorov A.A., Golikov A.S. Published: 02.10.2014
Published in issue: #5(98)/2014  


Category: Power-generating and Transport Machine Building  
Keywords: steam turbine, exhaust hood, pressure irregularity, experiment

Vibrational reliability control for turbine blades is the most important requirement of turbomachinery industry. In most cases blades vibrations are caused by aerodynamic forces connected with irregularity of velocity and pressure fields. However, there are practically no data in scientific literature on the problem of impact on a blades vibration condition of irregular pressure inside exhaust hood for steam turbines. The problem of intensity estimates of static pressure irregularity within the entrance section for axial-radial exhaust hood of low power steam turbine is solved. For this purpose exhaust hood model is built and static pressure distribution within computational the entrance section is obtained by numerical simulation. Then, an experimental research of pressure irregularity was carried out using a physical model of exhaust hood. Air was used as a working body at M= 0.17...0.19. The comparison of the obtained results with the computational ones showed that satisfactory quality coincidence is observed only within angle range of 0...180°. An evaluation method of irregularity value was offered. The research showed that pressure irregularity in the axial-radial exhaust hood caused by the inverted stream exists and the evaluation method has been offered.


[1] An investigation of facilities acting on swirl flow in the collection chamber of the exhaust hoods for the low-pressure cylinders in steam turbines. for the low-pressure cylinders of steam turbines. Teploenergetika [Therm. Eng., vol. 47, no. 11, pp. 984990], 2000, no. 11, pp. 28 (in Russ.).

[2] Ris V.V., Smirnov E.M., Kirillov A.I., Galaev S.A., Simoyu L.L., Gudkov N.N., Kirillov V.I., Ermolaev V.V. Numerical simulation of flow in a steam-turbine exhaust hood: comparison results of calculations and data from a full-scale experiment. Teploenergetika [Therm. Eng., vol. 56, no. 4, pp. 277-283], 2009, no. 4, pp. 1117 (in Russ.).

[3] Sidorov A.A., Golikov A.S. Estimation of degree of pressure irregularity within in the inlet section axial-radial exhaust of steam turbine. Aspirant i soiskatel’ [Post-graduate and applicants], 2010, no. 3 (in Russ.).

[4] Izmeriteli davleniya mnogofunktsional’nye PROMA-IDM. Rukovodstvo k ekspluatatsii [Pressure-measuring instrument Multifunctional. Operators manual], 2004. 19 p.

[5] Korn G.A., Korn T.M. Mathematical handbook for scientists and engineers: definitions, theorems, and formulas for reference and review. USA, McGraw-Hill, 1968. 1130 p. (Russ. ed.: Korn G., Korn T. Spravochnik po matematike dlya nauchnykh rabotnikov i inzhenerov. Moscow, Nauka Publ., 1984. 831 p.).

[6] Deych M.E., Zaryankin A.E Gazodinamika diffuzorov i vykhlopnykh patrubkov turbomashin [Gasdynamics of diffusers and exhaust of turbomachinery]. Moscow, Energy Publ., 1970. 384 p.