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Numerical Investigation on the Aerodynamics and Infrared Radiation Characteristics of 2-dimensional Nozzles with Sheltering Baffles

Author: FanRenZuo
Tutor: ZhangJingZhou
School: Nanjing University of Aeronautics and Astronautics
Course: Aerospace Propulsion Theory and Engineering
Keywords: Two yuan nozzle Blocking plate Sawtooth Infrared radiation Numerical Simulation Experimental study
CLC: V231.1
Type: Master's thesis
Year: 2009
Downloads: 72
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Abstract


Aircraft engine exhaust system components and high temperature heat is vehicle exhaust plume hemisphere after the main source of infrared radiation, round to rectangular structure of non-axisymmetric nozzle relative to the axis of symmetry reference nozzle performance loss in case of a lower effective reduce heat and nozzle jet infrared radiation signal. Content of this study is two yuan round to rectangular nozzle (an aspect ratio of 3.33) installed at the outlet cover plate and the lower triangular serrated, based CFD / IR (computational fluid dynamics / infrared radiation) integrated approach to the numerical simulation study the aerodynamic characteristics and the shielding plate and serrated on the nozzle wall and the intensity of the infrared radiation plume suppression effect. Vaginal discharge nozzle shielding plate structure changed the original two yuan nozzle flow field symmetric distribution, relative to the baseline nozzle, installing baffles two yuan nozzle did not reduce the total pressure recovery coefficient, with double shielding plate distance increases, the layer structure and the single block block compared with the structure layer on the cover plate with the shielding plate between the ejector air flows increase the temperature gradually decreased. By spacing 10mm double block structure on the shutter open seam, you can make sandwich ejector channel coefficients never slotted the 0.31% increase to 0.63%, and add slit tongue ejector cooling structure factor can be achieved 1.45%. After serrated nozzle structure of binary nozzle generally reduced speed / temperature of the core area of ??the length of the lead relative to the reference reflection coefficient D nozzle has improved to some extent, but the blockage caused by the thrust coefficient serrated with more significant reduced. In this paper studied sawtooth structure, four smaller teeth back angle relative ejector nozzle largest coefficient is better able to reduce the speed / temperature core length. Different structures of the shielding plate structures were on nozzle exhaust plume infrared radiation at -90 ° ~ 0 ° direction has a good inhibitory effect. Layer structure can effectively reduce the vertical block below the surface of the infrared radiation, but at the same time it enhances the 0 ° ~ 90 ° direction of the infrared radiation. With a double slit film cooling of the exhaust system, the shielding plate of the infrared radiation has more significant inhibitory effect. After four toothed serrated nozzle angle smaller structures infrared radiation suppression best results. This vent exhaust system of binary scale model was investigated experimentally by measuring the different structure of the nozzle orifice downstream temperature, velocity field distribution analysis of binary unilateral occlusion serrated jet impact; by measuring different jet nozzle structure and the inner wall surface of the exhaust system of the infrared radiation intensity, quantitative comparison of the single, double under cover and exhaust system for exhaust plume infrared radiation suppression effect.

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