Design, construction and testing of pulse detonation engine

Detonation pulse engine is used in the production of propulsion power for aerospace applications. This engine works based on detonation and basically consists of a tube with a high ratio of length to internal diameter with an open end, ignition system, fuel supply system and control system. In this research, detonation pulse wave power generator has been designed and built. This generator uses compressed natural gas (CNG) with a purity of 88% methane as fuel and oxygen gas as oxidizer. In this pulse detonation generator, fuel and oxidizer are placed in two separate tanks, and for their proper combination, a suitable mixing system is placed on the way to enter the explosive tube. The performance of the engine was evaluated in the tests carried out. To investigate the effect of methane concentration on detonation combustion characteristics in the engine, the temperature and pressure of the exhaust gases of the engine have been measured. In the investigations, it was found that by increasing the equivalence ratio of fuel and oxidizer from 0.7 to 1.6, the pressure increases almost uniformly from 17 to 21 bar. Also, with the increase of the equivalence ratio to the stoichiometric equivalence ratio, the engine output temperature increases and then gradually decrease.