Abstract
At the National Technical University “Kharkiv Polytechnical Institute”, an experimental pulse compression detonation (PCD) system was developed to operate on propane-air mixtures while addressing potential issues with regards to efficiency, ignitability of the gas, and the critical tube diameter for detonation. In this PCD system, the reactive gas was pre-compressed within the detonation tube, before ignition. The resulting mixture was found easier to ignite, and the transition to detonation within the tube was much more reliable and consistent. To gain further insight, and to investigate the effect of pressure gradient on the strength/velocity of outflow products and the overall thermodynamic cycle, a two-stage modelling procedure was adopted. First, a 3D inert simulation of the compression process of the PCD system was conducted using ANSYS. The resulting pressure and density profiles within the detonation tube were then prescribed as initial conditions for a 2D detonation stroke and outflow simulation. For this stage, the Compressible Linear Eddy Model for Large Eddy Simulation (CLEM-LES) framework adopted. For the PCD system, it was found that higher peak pressures were obtained at the outflow location of the tube when compared to a detonation tube filled initially at constant pressure equal to the ambient condition. As a result, the higher thermal efficiency of the detonation cycle may be achieved. However, it was found that the outflow products were under expanded, which may adversely affect the generated impulse. Therefore, the use of nozzles should be investigated in future work as part of the PCD system proposed here.
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Maxwell, B., Korytchenko, K., Shypul, O. (2020). Numerical Simulation of Compression and Detonation Strokes in a Pulse Compression Detonation System. In: Ivanov, V., Pavlenko, I., Liaposhchenko, O., Machado, J., Edl, M. (eds) Advances in Design, Simulation and Manufacturing III. DSMIE 2020. Lecture Notes in Mechanical Engineering. Springer, Cham. https://doi.org/10.1007/978-3-030-50491-5_17
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