Turbulent modelling analysis of saturated steam flow in curved convergent divergent nozzle

Abstract

The objective of this study is to analyze turbulent flow characteristics of turbulence modeling in Steam Curved Converging Diverging Nozzle. The three turbulence models have been conducted to simulate flow characteristics using k-ε standard, k-ε Renormalization Group (RNG), and Reynolds Stress Model (RSM). Fluid dynamics parameters such as pressure, velocity, and/or density have been analyzed graphically to know the more suitable model. The k- k-ε STD and RNG show give the similar profile of the turbulent kinetic energy (k) and energy dissipation rate (ε) that is differ with the RSM model. After throat position (position 0.67 m) the k-k-ε STD and RNG give the magnitude more than 1200 (m2/s2) for its turbulent kinetic energy and more than 3.2E06 (m2/s3) for its energy dissipation rate. The RSM model give the lowest values which far below 200 (m2/s2) for turbulent kinetic energy and below 2E05 (m2/s3) for energy dissipation rate. The turbulence modeling analysis of steam saturated flow in plane-curved nozzle present the increasing steam velocity about 3 Ma for 200 kPa steam inlet.