Conceptual design of the inlet flow preheat system to the nozzle test equipment of a turbine engine
محورهای موضوعی : فصلنامه شبیه سازی و تحلیل تکنولوژی های نوین در مهندسی مکانیک
Behrooz Shahriari
1
,
Hamid Farrokhfal
2
,
Mohammad Reza Nazari
3
1 - Faculty of Mechanics, Malek Ashtar University of Technology, Isfahan, Iran
2 - Faculty of Mechanics, Malek Ashtar University of Technology, Iran
3 - Faculty of Mechanics, Malek Ashtar University of Technology, Iran
کلید واژه: Turbofan engine nozzle, Nozzle ground test, Hot flow simulation, Combustion chamber design, Afterburner design,
چکیده مقاله :
To ensure the correct design and proper operation of turbine engine components, various types of ground tests must be performed, which requires the simulation of the input flow to these components. To test hot components such as nozzles, it is necessary to create a hot flow, which is done by the preheat system of the inlet flow. For the ground test of the nozzle of a turbofan engine that has an afterburner in addition to the combustion chamber, the preheat system must be able to supply air in two modes, dry mode and reheat mode. In this paper a combustion chamber with an afterburner is used to provide hot air to the nozzle. In the first step, using experimental and analytical relations, the combustion chamber is designed. The presented algorithm has the ability to calculate the diameter and reference surface of the combustion chamber, components of the combustion chamber and thermodynamic parameters. Then the obtained results are compared with the data of a similar annular combustion chamber. The comparison indicates the acceptable convergence of the design results with the experimental results. Finally, the output flow of the combustion chamber is considered as the input of the afterburner, and the temperature of the combustion flow is increased by the afterburner to the desired temperature. In addition to the ability to design a V-gutter flame keeper, the afterburner design algorithm also calculates the thermodynamic characteristics of the afterburner output stream, considering the requirements of flame stability.
To ensure the correct design and proper operation of turbine engine components, various types of ground tests must be performed, which requires the simulation of the input flow to these components. To test hot components such as nozzles, it is necessary to create a hot flow, which is done by the preheat system of the inlet flow. For the ground test of the nozzle of a turbofan engine that has an afterburner in addition to the combustion chamber, the preheat system must be able to supply air in two modes, dry mode and reheat mode. In this paper a combustion chamber with an afterburner is used to provide hot air to the nozzle. In the first step, using experimental and analytical relations, the combustion chamber is designed. The presented algorithm has the ability to calculate the diameter and reference surface of the combustion chamber, components of the combustion chamber and thermodynamic parameters. Then the obtained results are compared with the data of a similar annular combustion chamber. The comparison indicates the acceptable convergence of the design results with the experimental results. Finally, the output flow of the combustion chamber is considered as the input of the afterburner, and the temperature of the combustion flow is increased by the afterburner to the desired temperature. In addition to the ability to design a V-gutter flame keeper, the afterburner design algorithm also calculates the thermodynamic characteristics of the afterburner output stream, considering the requirements of flame stability.
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