SPANWISE TRANSPORT IN AXIAL-FLOW TURBINES .2. THROUGHFLOW CALCULATIONS INCLUDING SPANWISE TRANSPORT

In Part 1 of this paper, a repeating stage condition was shown to occu r in two low aspect ratio turbines, typically after two stages. Both t urbulent diffusion and convective mechanisms were responsible for span wise transport. In this part, two scaling expressions are determined t hat account for the influence of these mechanisms in effecting spanwis e transport. These are incorporated into a throughflow model using a d iffusive term. The inclusion of spanwise transport allows the use of m ore realistic loss distributions by the designer as input to the throu ghflow model and therefore focuses attention on areas where losses are generated. In addition, modeling of spanwise transport is shown to be crucial in predicting the attenuation of a temperature profile throug h a turbine.