Stamping Extended-range Artillery Of The Solid Fuel Flow Numerical Simulation Studies

Nowadays, the assisted-range technology of projectile develops rapidly. Compared to other air breathing engines, solid fuel ramjet (SFRJ) has become a very attractive propulsion system for its high specific impulse (8000～11000N·s/kg), low cost, structure simplicity and high reliability. However, due to the coupling of combustion and turbulent flow, the internal flow field of SFRJ is very complicated, and it is one of the puzzling problems of SFRJ.The present paper focuses on the SFRJ assisted range projectile which the design Mach number is 3, the two-dimensional axisymmetric steady internal flow field in SFRJ is numerically simulated, thus provide theory basis for the primary design stage. The research of this paper can be divided into two parts:In the first part, the original intake model is numerically simulated, then its flow structure, throttle character and flow field character are analyzed, and the results show that the performance of the original intake model is unsatisfactory. Aim at the shortcomings of the original intake model, the improved intake model is obtained, and also its numerical simulation is achieved, then its flow structure, throttle character and flow field character are analyzed, the results show that the performance of intake can meet the request. After the intake model is confirmed, the stable operation range of intake is obtained.In the second part, on the basis of the improved intake model, the compute model in internal flow field of SFRJ assisted-range projectile is established, which based on the k -εturbulent model, simple react flow and Eddy Dissipation model, and also the numerical simulation of the whole internal flow field are achieved. The flow field structure, reattachment point position, temperature distribution, chemical species distribution and total pressure recovery in the combustion chamber are analyzed. The influence of aft combustion chamber and air-fuel ratio on the combustion efficiency and other performance parameters are also analyzed, respectively.The conclusions of this paper have reference value for the research and manufacture of SFRJ assisted range projectile.