The challenging conditions at which gas turbine engines operate mean that careful management of component temperatures is necessary, in order to ensure component integrity and reasonable service life. Pressurised flow...The challenging conditions at which gas turbine engines operate mean that careful management of component temperatures is necessary, in order to ensure component integrity and reasonable service life. Pressurised flows extracted from the compressor can be used for cooling, sealing and balancing of components throughout the engine. Cooling is typically necessary for some combustor and turbine components, and sealing flows may be needed to exclude high temperature gases. In addition to cooling and sealing requirements, there is also a need to balance thrust loads in an engine, to limit loads on bearings, arising from the pressure differentials across compressor and turbine disc assemblies. The diverse tasks of cooling, sealing and balancing are generally assigned to a system known as the internal air system or secondary flow system. This paper describes the technologies associated with this system for both industrial gas turbine engines and aero-engines, and the current state of the art and challenges in component and subsystem design.展开更多
The resonances of parametric vibration with forced vibration isanalyzed, the bifurca- tion equation of the system is obtained andthe singularity analysis is made. Some of the laws and phe- nomenaare revealed. The tran...The resonances of parametric vibration with forced vibration isanalyzed, the bifurca- tion equation of the system is obtained andthe singularity analysis is made. Some of the laws and phe- nomenaare revealed. The transition variety and bifurcation diagram of thephysical parameteric plane are given. the results can be used inengineering.展开更多
文摘The challenging conditions at which gas turbine engines operate mean that careful management of component temperatures is necessary, in order to ensure component integrity and reasonable service life. Pressurised flows extracted from the compressor can be used for cooling, sealing and balancing of components throughout the engine. Cooling is typically necessary for some combustor and turbine components, and sealing flows may be needed to exclude high temperature gases. In addition to cooling and sealing requirements, there is also a need to balance thrust loads in an engine, to limit loads on bearings, arising from the pressure differentials across compressor and turbine disc assemblies. The diverse tasks of cooling, sealing and balancing are generally assigned to a system known as the internal air system or secondary flow system. This paper describes the technologies associated with this system for both industrial gas turbine engines and aero-engines, and the current state of the art and challenges in component and subsystem design.
基金National Natural Science FoundationDoctoral Programme Foundation of Institution of Higher Education of China
文摘The resonances of parametric vibration with forced vibration isanalyzed, the bifurca- tion equation of the system is obtained andthe singularity analysis is made. Some of the laws and phe- nomenaare revealed. The transition variety and bifurcation diagram of thephysical parameteric plane are given. the results can be used inengineering.
