Theoretical Design and Computational Fluid Dynamic Analysis of Projectile Intake

Abstract

Abstract-With the development of the science and technology, the more requirements such as cost effective, high specific impulse in wide operation rang, becomes stricter and multiplicity. However, the existing supersonic inlet can no longer adjust to all the new projectiles. In this paper, based on the basic characteristic of inlet and considering the design requirements, the two-dimensional supersonic projectile inlet was designed and verified by numerical simulation under different operating conditions such as attack angle, altitude, and so on. The results are shown that: 1) The design process is successful, but the working conditions should be limited to the small angle of attack; 2) The total pressure recovery coefficient is increasing as the Ma number increases, and then is gradually decreased after the point of Mach number is equal to 0.5; 3) The existence of attack angle reduces values of total pressure recovery. And moreover, the shock wave which occurs at the anterior point is gradually deviating from projectile body direction with the increase of attack angle; 4). The variance ratio in the outlet has the acute changed with increasing of altitudes clearly, but its corresponding values degrade sharply in the entrance.Index Terms-supersonic air inlet, two-dimension, ramjet projectile, numerical simulation, influence factors

Computational Fluid Dynamics Verification and Noise Prediction of Ramjet with Wedge-shaped Flame Holder

“…The results of the numerical calculations and experimentations point out that: (1).When the turbulence model is LES and the xcomponents equal to 78 mm, there are same errors in the midcontinental region of Y-axis, but the two simulation results are both in good agreement with experimental data at another position; (2). The differences of the numerical results are not significant at the same position of x-axis except the middle of Y-axis coordinates where the SST provides more accurate; (3). The LES calculated values shows a slight oscillation in some areas, but this is not appeared in other models.…”

“…However, future studies have highlighted to limit those methods is the lack of efficient combustion capacity. Thus, this phenomena has led widespread attention and better development in the wedge-shaped flame holder, which involving the roles of flame stabilization and mix improvement, and achieved more satisfactory results in existing types of the ramjet engine [1][2][3][4][5].With developing the flame stabilization technology and studies on this area, exploring noise, which caused by flow and combustion are vital because the problem is becoming increasingly prominence. There are currently lots of articles focus on outside noise and developing variety of methods to preserve the environment.…”