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Flow, Turbulence and Combustion

, Volume 92, Issue 1–2, pp 269–297 | Cite as

On The Validation of LES Applied to Internal Combustion Engine Flows: Part 1: Comprehensive Experimental Database

  • E. Baum
  • B. PetersonEmail author
  • B. Böhm
  • A. Dreizler
Article

Abstract

Improved understanding of in-cylinder flows requires knowledge from well-resolved experimental velocimetry measurements and flow simulation modeling. Engine simulations using large eddy simulations (LES) are making large progress and the need for well documented velocimetry measurements for model validation is high. This work presents velocimetry measurements from PIV, high-speed PIV, stereoscopic PIV, and tomographic PIV to extensively describe the in-cylinder flow field in a motored optical engine operating at 800 RPM. These measurements also establish a comprehensive database designed for LES model development and validation. Details of the engine, engine accessory components, and well-controlled boundary conditions and engine operation are presented. The first two statistical moments of the flow field are computed and show excellent agreement among the PIV database. Analysis of statistical moments based on limited sample size is presented and is important for modeling validation purposes. High-speed PIV resolved the instantaneous flow field throughout entire engine cycles (i.e. 719 consecutive crank-angles), while tomographic PIV images are further used to investigate the 3D flow field and identify regions of strong vortical structures identified by the Q-criterion. Principle velocity gradient components are computed and emphasize the need to resolve similar spatial scales between experimental and modeling efforts for suitable model validation.

Keywords

Particle image velocimetry (PIV) Stereoscopic PIV Tomographic PIV High-speed PIV In-cylinder flow field, experimental database for LES validation Internal combustion engines 

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Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  1. 1.Fachgebiet Reaktive Strömungen und MesstechnikTechnische Universität DarmstadtPetersenstrasse 32Germany
  2. 2.Fachgebiet Energie- und KraftwerkstechnikTechnische Universität DarmstadtPetersenstrasse 32Germany

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