URANS Predictions of the Effects of Synthetic Jets on the Separated, Transitional Flow Over a Low-Pressure-Turbine-Like Flat Plate

TitleURANS Predictions of the Effects of Synthetic Jets on the Separated, Transitional Flow Over a Low-Pressure-Turbine-Like Flat Plate
Publication TypeConference Proceedings
Year of Publication2010
AuthorsMarconcini M, Pacciani R, Arnone A
Conference NameASME Turbo Expo
Volume7: Turbomachinery, Parts A, B and C
Pagination2605–2613
PublisherAMER SOC MECHANICAL ENGINEERS, THREE PARK AVENUE, NEW YORK, NY 10016-5990 USA
Conference LocationGlasgow, UK, 14-18 June
ISBN Number978-0-7918-4402-1
Accession NumberWOS:000291010301048
Other NumbersScopus 2-s2.0-82055200361
KeywordsActive Control, LKE, LPT, Separated Flow Transition, Synthetic Jets
Abstract

A URANS solver has been applied to study the effects of a synthetic jet actuator on the laminar boundary layer separation over a flat plate with adverse pressure gradient. The pressure distribution over the flat plate is representative of the suction side of a ultra-high-lift, LP turbine airfoil. Measurements for several Reynolds numbers, are provided via experimental tests carried out in the framework of the European project TATMo (Turbulence and Transition Modeling for Special Turbomachinery Applications). The actuator device, in the form of a two-dimensional slot, has been conceived in order to obtain jet aerodynamic characteristics suitable for separation control. The study has been carried out using a novel, transition-sensitive, non-linear eddy-viscosity model. It is based on the coupling of an additional transport equation for the so-called laminar kinetic energy (LKE) to a realizable, quadratic eddy-viscosity model that provides an explicit algebraic formulation for the Reynolds stresses. The analysis covers steady as well as unsteady cases characterized by different actuator frequencies. Comparisons between measurements and computations are presented. The suitability of the proposed approach to simulate the time- and phase-averaged effects of a synthetic jet for boundary layer control at typical operating conditions of high-lift LP-turbine blades will be discussed in detail.

Notes

ASME paper GT2010-23297

URLhttp://proceedings.asmedigitalcollection.asme.org/proceeding.aspx?articleid=1610231
DOI10.1115/GT2010-23297
Refereed DesignationRefereed