On Modeling the Combustion Wave Propagation and the Impulse Calculation of a Pulsed Detonation Engine Burner

• Main Authors: Yang Tsung-Yeh, 楊宗燁
• Other Authors: S. M. Shiah
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/73462720402703362658

碩士 === 國防大學中正理工學院 === 兵器系統工程研究所 === 93 === Using pulsed detonation engine (PDE) for propulsion has long been the goal to aerospace researchers, due to its great potential in upgrading the vehicle speed, and the capability to help reducing the propulsion system weight and cost. Although with so many promising benefits, the development of PDE still involves many technical issues to be studied, such as the initiation via a deflagration/detonation transformation (DDT), the frequency control of the pulsed ignition, and integration of the total impulse for a multi-tubed PDE, etc. In viewing these challenges, this thesis presents a fundamental study with focus centered on the method of impulse calculation for a basic PDE cycle, as well as the dynamic behavior of the combustion wave during the DDT process. In contents, the one-dimensional Chapmann-Juoguet detonation model and the STANJAN computer program by Reynolds [31] were invoked to compute the detonation speed for the impulse calculation. Besides, the experimental data of Cooper et al. [5] were adopted in carrying out a series of data regression analysis for the combustion wave behavior. Through this study, it was found that (i) using the computed C-J speed for the impulse calculation serves as a possible alternative of that used by Wintenberger et al. [4] though the accuracy may still stand improvement; (ii) using the averaged velocity between measuring sensors to identify the DDT length and time as introduced by Cooper et al. [5] seems to be not universal enough and is arguable when the number of sensors is varied; (iii) using a variable acceleration model would be better to simulate the dynamic behavior of the combustion wave during the DDT process, (iv) using the energy conservation law of thermodynamics to set up a comprehensive model for predicting the DDT pressure history, in terms of the temporal displacement of the combustion wave, is shown to be possible and stands for further studies to make it more practical to help the design of a mechanism using DDT to initiate the operation of a PDE.