THE INFLUENCE OF LEAN AND SWEEP IN A LOW PRESSURE STEAM TURBINE: ANALYSIS OF THREE STAGES WITH A 3D CFD MODEL

摘要

The present paper accompanies the analysis of Volker et al. (2008), where experimental measurements on a three stage LP turbine for different configurations with lean and sweep in the last nozzle guide vane were presented followed by an analysis of these with a through-flow method. The present paper continues the analysis of the three stage machine with the support of steady 3D RANS calculations with stage interface (mixing) planes between the stages and making use of the SST turbulence model. The flow simulations are validated by comparison with flow traverses and with blade surface static pressure measurements. Good agreement is found between the simulations and the measurements, and the causes of discrepancies are analysed and discussed.