Numerical Comparison between Two Tailpipe Shapes of Valved Pulsejet Engine

Abstract

Abstract In this article, the valved pulsejet engine has been numerically investigated using Ansys/fluent (CFD) program. The designed model has a 1400 cm length and 17 cm combustion chamber diameter connected with one of two different shapes of exhaust pipe that has the same length (45 cm). The first shape has a 12 cm constant diameter abbreviated by the constant D; the second has a differential diameter in which the near and far ends are having 12 cm and 15 cm, respectively, and also denoted by different D. The conclusion was the maximum velocity is the same value (46 m/s) in the two cases but centered at the beginning of different D case. In the constant D case, the velocity was distributed in the last 45cm of the exhaust pipe. The maximum pressure generated in the combustion chamber in the constant D case is twice the value compared to the second case. In the case of different D, the pressure curve has a rather strange behavior. The temperature distribution exhibits the same behavior in both cases, but the engine has a different diameter tailpipe generate temperature more significant than the second case by 10%.