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Research on the Detonation Around Blunt-body in Premixed Supersonic Flow

Author: ZhangJiYe
Tutor: ZhouJin
School: National University of Defense Science and Technology
Course: Aeronautical and Astronautical Science and Technology
Keywords: Premixed Supersonic speed Blunt body The structure of the wave of bombers
CLC: O382
Type: Master's thesis
Year: 2007
Downloads: 59
Quote: 1
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Abstract

Papers selected blunt body in supersonic hydroxide premixed flow, generated by the detonation phenomenon study, focusing on the blunt body surface in the initial static temperature higher supersonic the hydroxide premixed airflow generated detonation The characteristics of the in-depth study. And through simulation of the flow conditions at the same premix blunt body radius around the detonation wave structure. Continuous supersonic premixed air heaters provide experimental hypersonic pre-the punks gas to flow equipment use own design, the paper first introduces the experimental part, the focus of this part of the design features and performance of the heater introduced, followed by the use of the composition of the monitoring and control system and schlieren equipment, experimental structural features of the experimental platform Gas Supply System Profile. Through high-speed schlieren images obtained in the experiment, pressure, flow measurement parameters, combined detonation theory proved supersonic premixed flow, low Mach number can be achieved in the case of high static temperature premixed flow field detonate, and compare the cold flow experiments unsteady phenomena described detonating detonation wave structure, as well as detonation. Premixed hydrogen / oxygen stream equivalence ratio affect the speed of the detonation, the detonation velocity is less than in the case of constant stream Mach number, Mach number appears detonation / deflagration transition - DDT process, if the same stream Mach number, it will produce a stable detonation wave structure; higher than the free stream Mach number, it will forward to spread, but because of the energy is not sufficient to promote the detonation wave continues to propagate forward, The front of the detonation wave in the high-speed flow field similar to the periodic vibration. Based on the experiments, according to the experimental parameters obtained in the experiment using simulation software Fluent simulation. Summarized several different complexity the hydroxide reaction model, through numerical example has been not only save computing time, and meet the requirements of the calculation model accuracy. And with this model, combined with the experimental results, blunt tip radius of the detonation structure under the conditions of the same flow conditions. Blunt body radius increases, the detonation wave will occur from the alkylene detonation to the detonation transition; hydroxide mixture equivalence ratio in the case of the remaining conditions are unchanged, change will cause the detonation propagation velocity increases and the wavefront changes in the structure of the surface; change to the Mach number of the detonation wave change to super detonation. In the final for the further study of the detonation, and detonation of applications put forward some constructive suggestions, and improvements for the shortcomings in the previous stage experimental study.

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