Computational Study on Flow Characteristics of Dual Bell Nozzle with Varying Altitude Effect

The importance of the Dual Bell Nozzle (DBN) comes due to its adaptive performance concerning altitudes. The Prandtl–Meyer expansion theory plays a prominent role in defining the expansion at the inflection point. The base length and extended nozzle length help to get the aspect ratio (AR). In this paper, CFD analysis is performed using ANSYS to analyze the flow pattern of the dual bell rocket nozzle by using a two-dimensional axis-symmetric model, which solves the governing equation by a control volume method. Analysis of several parameters like Mach number, pressure, density, and temperature are evaluated at different altitudes. The main objective of the research is to display the flow pattern of DBN at different altitudes. The higher aspect ratio proves to give better performance at greater altitudes.