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research-article

INVERSE ANALYSIS OF IN-CYLINDER GAS-WALL BOUNDARY CONDITIONS: INVESTIGATION OF A YITTRIA STABILIZED ZIRCONIA THERMAL BARRIER COATING FOR HOMOGENEOUS CHARGE COMPRESSION IGNITION

[+] Author and Article Information
Ryan O’Donnell

Clemson University International Center for Automotive Research Greenville, SC, USA
rodonne@g.clemson.edu

Thomas R. Powell

Clemson University International Center for Automotive Research Greenville, SC, USA
trpowel@g.clemson.edu

Mark A. Hoffman

Clemson University International Center for Automotive Research Greenville, SC, USA
mhoffm4@clemson.edu

Eric H. Jordan

University of Connecticut Department of Mechanical Engineering Storrs, CT, USA
jordan@engr.uconn.edu

Zoran Filipi

Clemson University International Center for Automotive Research Greenville, SC, USA
zfilipi@clemson.edu

1Corresponding author.

ASME doi:10.1115/1.4036387 History: Received February 21, 2017; Revised March 13, 2017

Abstract

Thermal Barrier Coatings (TBC) applied to in-cylinder surfaces of a Low Temperature Combustion (LTC) engine provide opportunity for enhanced efficiency via two mechanisms: (i) positive impact on thermodynamic cycle efficiency due to combustion/expansion heat loss reduction, and (ii) enhanced combustion efficiency. Heat released during combustion increases the temperature gradient within the TBC layer - elevating surface temperature over combustion-relevant crank angles. Thorough characterization of this dynamic temperature ‘swing’ at the TBC-gas interface is required to ensure accurate determination of heat transfer and the associated impact(s) on engine performance, emissions, and efficiencies. This paper employs an Inverse Heat Conduction solver based on the Sequential Function Specification Method (SFSM) to estimate TBC surface temperature and heat flux profiles using sub-TBC temperature measurements. The authors first assess the robustness of the solution methodology ex situ, utilizing an inert, quiescent environment and a known heat flux boundary condition. The inverse solver is ultimately extended in situ to evaluate surface phenomena within a TBC-treated single-cylinder, gasoline-fueled, Homogeneous Charge Compression Ignition (HCCI) engine. The resultant analysis provides crank angle resolved TBC surface temperature and heat flux profiles over a host of operational conditions.

Copyright (c) 2017 by ASME
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