Numerical investigation of a single jet impingement on a flat surface using a cubic k-? non-linear eddy viscosity model, to predict the effect of cooling on gas turbine blades

• Main Author: Mostafa N.A.
• Other Authors: 24332354200
• Format: Conference paper
• Published: 2023
• Subjects: Cubic; Eddy viscosity model; Flat surface; Jet impingement; Non-linear; Numerical investigation; Forecasting; Gas turbine locomotives; Gas turbines; Heat exchangers; Heat transfer; Kinetic energy; Sustainable development; Turbomachine blades; Turbulent flow; Viscosity; Wall flow; Flat surfaces; Numerical investigations; Mathematical models

The ability to accurately predict the effect of cooling on gas turbine blades is essential in designing the blades that will operate at extremely high temperature. The standard k-? linear eddy viscosity model is known to be inaccurate in predicting highly complex flows. Thus, a relatively new cubic k-? nonlinear eddy viscosity model was tested to ascertain whether it has improved the performance of eddy viscosity models. A single jet impingement on a flat plate with surface-to-nozzle distance of H/D = 6 was investigated numerically using a cubic k-? nonlinear eddy viscosity model of Craft et. al. [1] and high-Re k-? linear eddy viscosity model of Jones & Launder [2]. Both use standard wall-function to model the near-wall flow. Dynamic field profiles taken at certain distances away from the impingement point were compared with experimental results of Cooper et al. [3]. The heat transfer field results were compared with the experimental data of Baughn et al. [4]. The dynamic field results show that the cubic non-linear model gives a much better prediction than the linear model. The heat transfer results showed that the linear model over-predicted the heat transfer rate at the stagnation point whilst the non-linear model gave under-prediction due to a lower prediction of the turbulent kinetic energy at that region. �2009 IEEE.