Effect of trailing-edge boundary conditions on acoustic feedback loops in high-pressure turbines
RD Sandberg, APS Wheeler
Journal of Sound and Vibration | ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD | Published : 2019
The occurrence and sensitivity of acoustic feedback loops was investigated for a linear high-pressure turbine (HPT) vane cascade at realistic operating conditions, i.e. isentropic exit conditions of Re = 570, 000 and M = 0.92. Forced compressible Navier–Stokes simulations were conducted to study the temporal response of various base flows to an initial small-amplitude pulse. One of the objectives was to assess the impact the quality of the base flow has on the instability behaviour, i.e. whether base flows obtained from computationally more affordable approaches such as Reynolds-averaged Navier–Stokes (RANS) produce similar results as those obtained from highly resolved large-eddy simulation..View full abstract
Awarded by Office of Science of the U.S. Department of Energy
Awarded by Swiss National Supercomputing Centre (CSCS)
The authors are grateful for the computing resources provided The Pawsey Supercomputing Centre with funding from the Australian Government and the Government of Western Australia, resources of the Oak Ridge Leadership Computing Facility at the Oak Ridge National Laboratory, which is supported by the Office of Science of the U.S. Department of Energy under Contract No. DE-AC05-00OR22725 and the Swiss National Supercomputing Centre (CSCS) under project ID S622.