Radial Migration of Shed Vortices in a Transonic Rotor Following a Wake Generator: A Comparison Between Time Accurate and Average Passage Approaches

This paper shows a comparison of an unsteady simulation using turbo and an average passage simulation for a two blade row configuration consisting of a wake generator followed by a transonic rotor. Two spacings were simulated, both close and far. The unsteady results compare well with experiment especially for the profile of efficiency difference between close and far. An analysis of results helps to explain the unusual profile seen experimentally that is due to the radial migration of wake generator shed vortices with negative radial velocities near the tip. In addition, different components of the average passage body forces (deterministic stresses) are explored that shows the main terms are the axial momentum and the metal blockage.

[1]  Mark G. Turner,et al.  High Fidelity 3D Simulation of the GE90 (Invited) , 2003 .

[2]  S. Baghdadi,et al.  Design and test of a low aspect ratio fan stage , 1988 .

[3]  Theodore H. Okiishi,et al.  Stator-Rotor Interactions in a Transonic Compressor—Part 2: Description of a Loss-Producing Mechanism , 2003 .

[4]  Steven E. Gorrell,et al.  The Effects of Blade-Row Spacing on the Flow Capacity of a Transonic Rotor , 1999 .

[5]  Steven E. Gorrell.  An experimental and numerical investigation of stator-rotor interactions in a transonic compressor , 2001 .

[6]  Jen‐Ping Chen,et al.  Comparison of time-accurate calculations for the unsteady interaction in turbomachinery stage , 1998 .

[7]  J. P. Chen,et al.  A Parallel Flow Solver for Unsteady Multiple Blade Row Turbomachinery Simulations , 2001 .

[8]  Theodore H. Okiishi,et al.  Stator-Rotor Interactions in a Transonic Compressor— Part 1: Effect of Blade-Row Spacing on Performance , 2003 .

[9]  Roger L. Davis,et al.  Modeling turbomachinery unsteadiness with lumped deterministic stresses , 1996 .

[10]  Mark L. Celestina,et al.  A New Procedure for Simulating Unsteady Flows Through Turbomachinery Blade Passages , 1994 .

[11]  Mark G. Turner,et al.  An Average Passage Closure Model for General Meshes , 1999 .

[12]  Roger L. Davis,et al.  DETERMINISTIC STRESS MODELING OF HOT GAS SEGREGATION IN A TURBINE , 2000 .

[13]  Jordi Estevadeordal,et al.  An Investigation of Wake-Shock Interactions in a Transonic Compressor With DPIV and Time-Accurate CFD , 2005 .

[14]  John J. Adamczyk,et al.  The Numerical Simulation of a High-Speed Axial Flow Compressor , 1992 .

[15]  Mark G. Turner,et al.  Linear Deterministic Source Terms for Hot Streak Simulations , 2002 .

[16]  F. Lyman,et al.  On the Conservation of Rothalpy in Turbomachines , 1992 .

[17]  J. Adamczyk.  Model equation for simulating flows in multistage turbomachinery , 1996 .