热科学学报（英文版）2005，Vol.14Issue(4)：314-320,7.
Interaction between Struts and Swirl Flow in Gas Turbine Exhaust Diffusers
Interaction between Struts and Swirl Flow in Gas Turbine Exhaust Diffusers
Roman Z.PIETRASCH 1Joerg R. SEUME1
作者信息
- 1. Turbomachinery Laboratory, University of Hannover, Appelstr. 9, D-31678 Hannover, Germany
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摘要
Abstract
The increasing use of gas turbines in combined cycle power plants together with the high amount of kinetic energy in modem gas turbine exhaust flows focuses attention on the design of gas turbine diffusers as the connecting part between the Brayton/Joule and the Rankine parts of the combined cycle. A scale model of a typical gas turbine exhaust diffuser is investigated experimentally. The test rig consists of a radial type, variable swirl generator which provides the exhaust flow corresponding to different gas turbine operating conditions.Static pressure measurements are carried out along the outer diffuser walls and along the hub of the annular part and along the centerline of the conical diffuser. Velocity distributions at several axial positions in the annular and conical diffuser have been measured using a Laser Doppler Velocimeter (LDV). Pressure recovery coefficients and velocity profiles are depicted as a function of diffuser length for several combinations of swirl strength, tip flow and strut geometries. The diffuser without struts achieved a higher pressure recovery than the diffuser with struts at all swirl angle settings. The diffuser with cylindrical struts achieved a higher pressure recovery than the diffuser with profiled struts at all swirl angle settings. Inlet flows with swirl angles over 18° affected the pressure recovery negatively for all strut configurations.关键词
gas turbine exhaust diffuser/swirl/struts/pressure recovery coefficientKey words
gas turbine exhaust diffuser/swirl/struts/pressure recovery coefficient分类
能源科技引用本文复制引用
Roman Z.PIETRASCH,Joerg R. SEUME..Interaction between Struts and Swirl Flow in Gas Turbine Exhaust Diffusers[J].热科学学报（英文版）,2005,14(4):314-320,7.
