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Pulse Detonation Engine DDT numerical simulation of

Author: ZhangYu
Tutor: WuXiaoSong
School: Nanjing University of Technology and Engineering
Course: Aerospace Propulsion Theory and Engineering
Keywords: Pulse Detonation Engine Deflagration to detonation transition Ignition position Ignition energy Obstacle spacing Obstructions than Hot spot
CLC: V235
Type: Master's thesis
Year: 2009
Downloads: 140
Quote: 3
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Abstract


Pulse Detonation Engine A new concept of engine thrust pulse detonation wave , relative to existing propulsion system in the thermodynamic cycle efficiency , Chong, the scope of work , simple structure , the thrust size can change such The potential advantages . Valid ignition key pulse detonation engine technology , not the actual direct initiation energy needs , thus using small ignition energy transition from deflagration to detonation in a shorter distance ( Deflagration DetonationTransition of DDT ) , more application prospects . Research on DDT process at home and abroad for the experimental study , we use the numerical calculation means , analog pulse detonation engine DDT , major work includes the following two parts : the first part : Analog different ignition position ( ignition position respectively 0.5 times the diameter , and 1 times the diameter , 1.5 times the diameter) , the ignition energy ( ignition zone diameter is 5mm , 6mm , 7mm ) under the program pulse detonation engine DDT process . The numerical method chosen explicit coupling algorithm, a chemical reaction model selection of single-step hydrogen / air chemistry appropriate than the reaction Arrhenius kinetic model . The simulation results show that when the location of the igniter doubled in diameter at the distance of the detonation tube head DDT shortest distance from the ignition energy as high as possible in the simulated range . Part II: Analog different obstacles spacing (pitch of 0.5 times the diameter of 1 times the pipe diameter, 1.5 times the diameter ) , the obstacle blockage ratio ( blockage ratio were 0.3,0.4,0.5 ) pulse detonation program process engines DDT . The simulation results show that the increase in the presence of obstacles inside the detonation chamber turbulence ; there is a telescopic expansion process of the flow field of the flame folds ; the obstacle corner shock wave reflection polylactide and flame interaction , greatly improving the reaction rate of the region , contributed to the rapid release of the local energy hot spots . When the obstacle spacing is doubled diameter detonation initiation shortest distance, With obstructions ratio increases the detonation distance is also reduced .

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CLC: > Aviation, aerospace > Aviation > Aero-engine ( propulsion system ) > Air jet engine
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