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Title: A novel method for correction of temporally- and spatially-variant optical distortion in planar particle image velocimetry

In-cylinder flow measurements are necessary to gain a fundamental understanding of swirl-supported, light-duty Diesel engine processes for high thermal efficiency and low emissions. Planar particle image velocimetry (PIV) can be used for non-intrusive, in situ measurement of swirl-plane velocity fields through a transparent piston. In order to keep the flow unchanged from all-metal engine operation, the geometry of the transparent piston must adapt the production-intent metal piston geometry. As a result, a temporally- and spatially-variant optical distortion is introduced to the particle images. Here, to ensure reliable measurement of particle displacements, this work documents a systematic exploration of optical distortion quantification and a hybrid back-projection procedure that combines ray-tracing-based geometric and in situ manual back-projection approaches.
 [1] ;  [1] ;  [2] ;  [1]
  1. Sandia National Lab. (SNL-CA), Livermore, CA (United States)
  2. Korea Institute of Machinery and Materials, Daejon (Korea)
Publication Date:
OSTI Identifier:
Report Number(s):
Journal ID: ISSN 0957-0233; 647762
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Measurement Science and Technology
Additional Journal Information:
Journal Volume: 27; Journal Issue: 8; Journal ID: ISSN 0957-0233
IOP Publishing
Research Org:
Sandia National Laboratories (SNL-CA), Livermore, CA (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Program (EE-2G)
Country of Publication:
United States
33 ADVANCED PROPULSION SYSTEMS particle image velocimetry; optical distortion; swirl-plane; re-entrant piston geometry; ray tracing; back-projection; diesel engine