Open AccessResearch on the influence of different obstacle structures on the energy distribution characteristics of pulse detonation gas
Author(s) -
Xiaofeng Li,
J.F. Xiao,
Feng Wang,
Wei Wang,
Mengqi Hu
Publication year - 2022
Publication title -
thermal science/thermal science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.339
H-Index - 43
eISSN - 2334-7163
pISSN - 0354-9836
DOI - 10.2298/tsci201026194l
Subject(s) - detonation , combustor , kinetic energy , mechanics , obstacle , materials science , pulse (music) , cross section (physics) , energy (signal processing) , internal energy , physics , thermodynamics , optics , combustion , chemistry , classical mechanics , explosive material , organic chemistry , quantum mechanics , detector , political science , law
In order to improve the gas energy conversion efficiency at the outlet of the pulse detonation combustor, numerical calculation methods were used to study the influence of three different cross-section obstacle structures of square, circle and trapezoid on the distribution characteristics of gas pressure potential energy, kinetic energy and internal energy in a single cycle at the outlet of pulse detonation combustor. The results show that: the expansion of pulse detonation gas mainly includes three-stages: primary expansion, secondary expansion, and over-expansion. Gas pressure potential energy, kinetic energy, and internal energy increase during the primary and secondary expansion stages, and decrease during the over-expansion stage. Pulse detonation combustor with trapezoidal cross-section obstacle structure has the smallest proportion of gas energy at the outlet of the combustor during the over-expansion stage and the highest proportion during the secondary expansion stage. Compared with square and circle cross-section obstacle structures, the gas energy distribution at the outlet of the pulse detonation combustor with trapezoidal cross-section obstacle structure is the easiest for turbomachinery to convert the gas energy.