Coupled Analysis of Thermo Fluid Flexible Multi body Dynamics of a Two Dimensional Engine Nozzle
Various components of an engine nozzle are modeled as flexible multi body components that are operated under high temperature and pressure. In this paper, in order to predict complex behavior of an engine nozzle, thermo fluid flexible multibody dynamics coupled analysis framework was developed. Temperature and pressure on the nozzle wall were obtained by the steady state flow analysis for a two dimensional nozzle. The pressure and temperature dependent material properties were delivered to the flexible multi body dynamics analysis. Then the deflection and strain distribution for a nozzle configuration was obtained. Heat conduction and thermal analyses were done using MSC.NASTRAN. The present framework was validated for a simple nozzle configuration by using a one way coupled analysis. A two way coupled analysis was also performed for the simple nozzle with an arbitrary joint clearance, and an asymmetric flow was observed. Finally, the total strain result for a realistic nozzle configuration was obtained using the one way and two way coupled analyses.