Control of Protrusion Induced Unsteady Supersonic Separation Using Boundary Layer Suction

EasyChair Preprint 4506

Abstract

The unsteady 3-dimensional separated flow induced by a square protrusion (measuring twice the local boundary layer thickness in both its width and height denoted by h), and its control by means of boundary layer suction through holes, is investigated using wind tunnel experiments and computations. Surface oil flow visualization, time resolved schlieren using high speed camera and surface static pressure measurements using pressure scanner are the diagnostics used to study the 3-dimensional shock boundary layer interaction. Unsteady-RANS computations are validated using the experimental data, and are used to complement the understanding of the flow field. It was observed from the oil-flow visualizations that at the span-wise centre, the separation location was at 2.6h from the protrusion. The time averaged foot of the separation shock measured from the schlieren images was at 2.80h from the protrusion. The computational results compared well with the visualizations as well as the surface pressure data. The computation of flow field with suction through holes upstream of protrusion suggested the emergence of interesting 3-dimensional flow patterns.

Keyphrases: SBLI, boundary layer suction, flow control

@booklet{EasyChair:4506,
  author    = {Hemanth Chandra Vamsi Kakumani and Sourabh Bhardwaj and Sriram Rengarajan},
  title     = {Control of Protrusion Induced Unsteady Supersonic Separation Using Boundary Layer Suction},
  howpublished = {EasyChair Preprint 4506},
  year      = {EasyChair, 2020}}