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Details of Grant 

EPSRC Reference: GR/R63691/01
Title: JREI: An Optical Diagnostic for making Turbulence Measurements in High Speed Airflows.
Principal Investigator: Bryanston-Cross, Professor P
Other Investigators:
Researcher Co-Investigators:
Project Partners:
Innolas (U K) Ltd QinetiQ University of Warwick
Department: Sch of Engineering
Organisation: University of Warwick
Scheme: JREI
Starts: 17 January 2002 Ends: 16 January 2004 Value (£): 47,220
EPSRC Research Topic Classifications:
Aerodynamics Fluid Dynamics
Instrumentation Eng. & Dev.
EPSRC Industrial Sector Classifications:
Aerospace, Defence and Marine
Related Grants:
Panel History:  
Summary on Grant Application Form
THE OPTICAL MEASUREMENT OF COHERENT MIXING WITHIN THE TRANSONIC EXHAUST PLUME OF A GAS TURBINE ENGINE.It is proposed to create a 5 pulse Nd/Yag laser system to capture multiple overlapping images onto a series of CCD (Charge Coupled Device) cameras. Each laser pulse, separated from the next by 3lOps, produces a single image of the particulate distribution within the seeded supersonic exhaust plume from a gas turbine engine. Image intensifiers in front of each camera amplify the images and act as fast shutters. The images are combined in pairs forming PIV (particle Image Velocimetry) measurements of the jet. Five sequentially captured images will track and measure the coherent mixing structure within the plume. The accuracy of the velocity measurement 4%. To date the single 2 frame PIV images made provide instantaneous measurements, but fail to map the evolution of large-scale structures. The approach has been researched low speed by the OEL (Optical Engineering Laboratories), but no high speed measurement has been made. However, in all power generation turbomachinery the airflow passes through the blade-rows at transonic speeds. The ability to measure large coherent structures will significantly help the understanding of flow unsteadiness needed to increase efficiency and performance. A more complete understanding of the mixing process will also lead to a reduction in jet noise.
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Organisation Website: http://www.warwick.ac.uk