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Design and Performance Simulation of an Experimental Rig for Infrared Stealth Research of Exhaust System of a Turbofan Engine

Author: GongYu
Tutor: JiHongHu
School: Nanjing University of Aeronautics and Astronautics
Course: Engineering Thermophysics
Keywords: Experimental device Turbofan engine Exhaust System Infrared radiation Numerical Simulation
CLC: V231.1
Type: Master's thesis
Year: 2007
Downloads: 240
Quote: 1
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Abstract


In this paper, for the purpose of the development of the infrared stealth experimental device of the turbofan engine exhaust system, the study of the design of the experimental apparatus and its mounting shaft of the simulation of the infrared properties of the symmetrical form of mixed exhaust nozzle. Research work is mainly done through numerical simulation, in which the physical model with Unigraphics software, mesh using Gambit software flow field is calculated using the FLUENT software, infrared radiation characteristics calculated using the development of our group turbine engine exhaust gas infrared radiation intensity forecast software TEESIRP (Tturbine Engine Exhaust System Infrared Radiate Prediction). The overall design of the experimental device include the following: the experimental design of the device, the outer culvert intake form design, key components size design, fan selection and parameter measurements of the flow field design. Features and Benefits of the part of the work lies in the use of a large number of CFD calculations aided design, a variety of cross-section of the speed of the outer culvert outside the culvert intake form using FLUENT software distribution, and the results are compared to determine fit the experimental device design requirements outer culvert intake form design; calculated using FLUENT software key components of the experimental apparatus outside Han-sectional velocity distribution in the case of major size parameter combination, and the results were compared to determine the critical dimensions of the components meet the requirements of the experimental device designed; using FLUENT software in the connotation, the outer culvert flow to meet the requirements of the experimental device designed to provide the needs of the dynamic pressure, the fan then selected based on multiple models of the design margin correction and Fan Factory fan performance curve fit to the experimental device fan model design needs. This part of the research is about to begin experimental device parts design, and the parts assembly design and lay a solid foundation. The infrared characteristics simulation study of the experimental setup, the calculated infrared properties install axisymmetric nozzle case. Calculated flow field calculation and infrared two steps, first calculate the experimental temperature field, flow field and concentration field distribution in the case of installing different nozzle using FLUENT software then use TEESIRP software to calculate the infrared radiation intensity spectral distribution and spatial distribution. Complete the calculation on the basis of from gas radiation characteristic analysis, parameter distribution of the flow field, the projected area of ??the various components within the nozzle change demonstrates the reliability of the results and the turbofan engine axisymmetric nozzle infrared intensity distribution mechanism. Work through the part of the forecast and analysis of the infrared radiation characteristics of the experimental apparatus in the state of design work, and laid a solid foundation for the expansion of the experimental study and experimental analysis of the phenomenon.

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CLC: > Aviation, aerospace > Aviation > Aero-engine ( propulsion system ) > Engine theory > Thermodynamics, heat transfer
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