AERODYNAMIC DESIGN AND SIMULATION OF ANNULAR NOZZLE USING METHOD OF CHARACTERISTICS
Keywords:
Supersonic, Method of Characteristics, Stream Function, Backward Characteristic, Isentropic, Prandtl Meyer expansion angle.Abstract
In this paper we develop a computer code which uses the Method of Characteristics and the Stream Function to define the annular nozzle contour for isentropic, inviscid, irrotational supersonic flows of any working fluid for any user-defined exit Mach number. The contour obtained is compared to theoretical isentropic area ratios for the selected fluid and desired exit Mach number. The accuracy of the nozzle to produce the desired exit Mach number is also checked. The flow field of the nozzles created by the code are independently checked with the commercial Computational Fluid Dynamics (CFD) code ANSYS-FLUENT. ANSYS- FLUENT predictions are used to verify the isentropic flow assumption and that the working fluid reached the user-defined desired exit Mach number. Good agreement in area ratio and exit Mach number is going to be achieved, verifying that the code is accurate.
