Characterization of Flow Dynamics in a Highly Overexpanded CD Nozzle under Varying NPR

Characterization of Flow Dynamics in a Highly Overexpanded CD Nozzle under Varying NPR/span>

Authors- Vishwajith V

Abstract-The characterization of flow dynamics in highly overexpanded convergent-divergent (CD) nozzles under varying nozzle pressure ratios (NPR) is a crucial aspect in understanding shock-induced flow separation and its impact on flow dynamics. This study focuses on the behavior of shock waves in the divergent section of a CD nozzle when subjected to NPR variations, leading to complex flow separation phenomena. The research aims to investigate the variations in flow physics when the nozzle is subjected to NPR variations which causes highly overexpanded cases with shock induced flow separation. Additionally, the study provides insights into the relationships between NPR and key flow features, such as flow deviation location, shock structure, and Mach stem/disc strength. The results highlight that flow properties do not exhibit linear changes across NPR variations; certain cases show abrupt shifts in gradients, while others maintain slightly linear gradients. This comprehensive analysis offers a deeper understanding of the non-linearities in flow dynamics and the performance variations in highly overexpanded CD nozzles.

DOI: /10.61463/ijset.vol.12.issue5.275