Investigation On The Establishment And The Propagation Characteristics Of Two-phase Rotating Detonation Wave

Rotating Detonation Engine(RDE)has the characteristics of fast heat release,high thermal cycle efficiency and simple structure.In recent years,it has received attentions widely.Considering the engineering application value of liquid fuel,this paper uses gasoline as fuel and air as oxidant to carry out experimental and numerical simulation of gas-liquid two-phase RDE.The ignition,propagation characteristics and flow of gas-liquid two-phase rotating detonation wave are analyzed.The main conclusions are as follows:The establishment and stable propagation of gas-liquid two-phase rotating detonation wave are realized by the experimental research.The working process of the two-phase RDE,the establishment process of the rotating detonation wave and its main influencing factors are analyzed.It is found that the influence of the inner diameter of the pre-detonation tube on the creation time of the rotating detonation wave is higher than the peak pressure of the detonation tube inside the detonation tube.The larger the inner diameter of the outlet,the shorter the creation time of the rotating detonation wave,and it is found that the rotating detonation wave in the combustion chamber has a periodic suction phenomenon on the gas in the pre-detonation tube.The effects of equivalent ratio,total air injection temperature,air injection slot and nozzle on the propagation of gas-liquid two-phase rotating detonation wave are analyzed.The rotating detonation wave in the test was within a wide range of equivalence ratio(0.57-1.08),the propagation mode of the rotating detonation wave is mainly single wave,and the acoustic coupling phenomenon occurs in the combustion chamber under the air injection slot width of 3 mm.In the temperature range studied,The propagation speed increases as the total temperature of the air increases.After the engine is equipped with a converging nozzle,the propagation state of the detonation wave can be improved.The propagation process and flow field structure of two-phase rotating detonation wave under non-uniform injection conditions are analyzed by numerical simulation.The total air temperature,fuel injection inhomogeneity,equivalence ratio,mass flow rate and number of detonation wave heads are studied.The influence of total air injection temperature,octane jet spacing and number of detonation wave heads on the total pressure of the combustion chamber outlet and the uniformity of the total temperature are analyzed.Numerical simulations show that there is a low equivalence ratio zone in the combustion chamber that does not participate in detonation,and a low temperature zone is formed near the slip line,which is the peak zone of the Mach number and the total pressure in the flow field;Under the equivalence ratio condition,the larger the octane jet spacing is,the more the detonation wave is disturbed by the fuel jet.The higher the total temperature of the air or the number of detonation wave heads,the uniformity of the total temperature and total pressure of the combustion chamber are improved.By the octane jet spacing increases,the uniformity of the total temperature at the exit of the combustion chamber improves,but the uniformity of the total pressure decreases.Both experimental and numerical simulations have found that the speed of detonation wave propagation increases with the increasing total air temperature.These research results can provide reference for the engineering application of RDE.