The key technology of powder fuel ramjet to be solved urgently

The research of powder fuel ramjet involves many disciplines such as aerodynamics, combustion, multiphase flow, materials science and so on. The intersection of various disciplines together constitutes the key technology in the research of powder fuel ramjet. Among them, powder fuel supply, powder fuel combustion organization and engine ignition are the key technologies that need to be solved urgently for powder fuel ramjet engines. 1 　Powder fuel supply technology Powder supply technology is the core technology of powder fuel ramjet engines. The continuous, stable and controllable supply of powder fuel is the prerequisite for reliable engine operation. The main design idea of u200bu200bthe powder fuel supply device is to use gas to fluidize the powder fuel in the tank, while ensuring the continuous supply of powder fuel under the push of the piston, and finally spray into the combustion chamber in the form of a gas-solid two-phase flow. Complete the fuel supply process. To achieve an efficient design of the powder supply system, it is necessary to further improve the accuracy of powder flow control, and carry out research on the powder fluidization mechanism and gas-solid transportation stability under the action of overload, vibration and sound field, and solve the problem of low powder flow adjustment ratio. 2　Powder fuel combustion organization technology The combustion process of powder fuel in the combustion chamber is a typical dust combustion process, and the powder fuel ramjet directly uses solid particles as fuel. Through the optimized design of the powder fuel injector, it can have better injection and dispersion effects in a larger powder fuel mass flow rate adjustment ratio. In addition, in order to make the engine have excellent self-sustaining combustion performance, certain flame stabilization measures can be taken, such as a certain form of flame stabilizer, or an external high-temperature fire source or an ignition source formed by self-compensation of a flow field to achieve continuous and stable combustion. 3　 Engine Ignition Technology When the powder fuel ramjet is ignited, the fuel is injected into the combustion chamber in the form of a gas-solid two-phase flow. Due to the fast injection speed, low fuel initial temperature, and high ignition temperature of metal and boron particles, the ignition of the engine is The flame stability has brought great difficulties. At present, researchers have carried out successful ignition experiments on powder fuel ramjet engines using heating wire ignition, solid gas generator ignition and high-energy spark plug ignition. However, the above ignition methods have problems such as low ignition reliability and complex structure. It cannot meet the requirements of miniaturization, light weight, and high reliability of powder fuel ramjet igniters. Therefore, seeking an efficient and reliable ignition method is one of the key technologies for the development of powder fuel ramjet engines. Previous post: Research on the ignition and combustion characteristics of powder fuel ramjet