Estimation of Thermal Barrier Coating Surface Temperature and Heat Flux Profiles in a Low Temperature Combustion Engine Using a Modified Sequential Function Specification Approach

O’Donnell, Ryan; Powell, Tommy; Filipi, Zoran; Hoffman, Mark

doi:10.1115/1.4035101

Cited by 13 publications

(14 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As shown in previous work by Powell et al 13 and O'Donnell et al, 33 a dense YSZ coating applied with the APS process produced a very tangible impact on HCCI combustion and cycle efficiencies. Initial investigations of the first-generation YSZ coating with IPBs reported here show incremental improvements in thermal and combustion efficiencies over the dense YSZ coating and baseline metal piston.…”

Section: Tbcs: Initial Findings With Gen 1 and Gen 2 Coatingsmentioning

confidence: 64%

“…Determining the coating surface temperature and heat flux from measurements underneath requires a special technique, since it creates a so-called inverse conduction problem. O'Donnell et al 32,33 developed such a method based on the sequential function specification method (SFSM). The SFSM solver requires TBC thickness and thermal properties to generate estimates of TBC surface temperature.…”

Section: Heat-flux Probesmentioning

confidence: 99%

“…The solver then minimizes the error between the measured temperatures and those calculated by adjusting the surface heat flux until the error approaches zero. 32,33 The inverse heat conduction solver carries out this process at every time step until the complete Figure 9. Layout of combustion chamber with an offset direct fuel injector and two heat-flux probes in the squish region.…”

Section: Heat-flux Probesmentioning

confidence: 99%

See 2 more Smart Citations

Experimental investigation of the relationship between thermal barrier coating structured porosity and homogeneous charge compression ignition engine combustion

Powell

O’Donnell

Hoffman

et al. 2019

International Journal of Engine Research

View full text Add to dashboard Cite

Heat transfer has a profound influence on homogeneous charge compression ignition combustion. When a thermal barrier coating is applied to the combustion chamber, the insulating effect magnifies the wall temperature swing, decreasing heat transfer during combustion. This enables improvements in both thermal and combustion efficiency without the detrimental impacts of intake charge heating. Increasing the temperature swing requires coatings with lower thermal conductivity and heat capacity. A promising avenue for simultaneously decreasing both thermal conductivity and capacity is to increase the porosity fraction. A proprietary solution precursor plasma spray process enables discrete organization of the porosity structure, called inter-pass boundaries, which in turn produces a step-reduction in thermal conductivity for a given porosity level. In this investigation, yttria-stabilized zirconia is used to create four different thermal barrier coatings to study the potential of structured porosity as means of improving the “temperature swing” behavior in a homogeneous charge compression ignition engine. The baseline coating is “dense YSZ,” applied using a standard air-plasma spray process. Next, significant reductions of the thermal conductivity are achieved by utilizing the solution precursor plasma spray process to create inter-pass boundaries with a moderate overall porosity. Performance, efficiency, and emissions are compared against both a baseline configuration with a metal piston and an air-plasma spray “dense YSZ” coating. Experiments are carried out in a single-cylinder gasoline homogeneous charge compression ignition engine with exhaust re-induction. Experiments indicate that incorporating structured porosity into thermal barrier coatings produces tangible gains in combustion and thermal efficiencies. However, there is an upper limit to porosity levels acceptable for homogeneous charge compression ignition engine application because an elevated porosity fraction leads to excessive surface roughness and undesirable fuel interactions. Comparison of the coatings showed the best results with coating thickness of up to 150 µm. Thicker coatings led to slower surface temperature response and attenuated swing temperature magnitude.

show abstract

Section: Tbcs: Initial Findings With Gen 1 and Gen 2 Coatingsmentioning

confidence: 64%

Section: Heat-flux Probesmentioning

confidence: 99%

Section: Heat-flux Probesmentioning

confidence: 99%

See 1 more Smart Citation

Experimental investigation of the relationship between thermal barrier coating structured porosity and homogeneous charge compression ignition engine combustion

Powell

O’Donnell

Hoffman

et al. 2019

International Journal of Engine Research

View full text Add to dashboard Cite

show abstract

“…In this study, temperature measurements from the uncoated (i.e., metal) probe utilize a direct Fourier method [27,28] to calculate the incident heat flux. In contrast, sub-TBC temperature measurements employ the SFSM-based analysis to estimate the functional form of the surface heat flux [19].…”

Section: Resultsmentioning

confidence: 99%

“…A more complete characterization of the modified SFSM solver can be found in Ref. [19]. Furthermore, interested readers are directed to Refs.…”

Section: Introductionmentioning

confidence: 99%

Inverse Analysis of In-Cylinder Gas-Wall Boundary Conditions: Investigation of a Yttria-Stabilized Zirconia Thermal Barrier Coating for Homogeneous Charge Compression Ignition

O’Donnell

Powell

Hoffman

et al. 2017

Journal of Engineering for Gas Turbines and Power

View full text Add to dashboard Cite

Thermal barrier coatings (TBCs) applied to in-cylinder surfaces of a low temperature combustion (LTC) engine provide an 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 extended in situ to evaluate surface thermal 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. Insight derived from this work may be correlated with TBC thermophysical properties to determine the impact(s) of material selection on engine performance, emissions, heat transfer, and efficiencies. These efforts will guide next-generation TBC design.

show abstract

Estimation of moving heat source for an instantaneous three-dimensional heat transfer system based on step-renewed Kalman filter

Wang

Zhang

2020

International Journal of Heat and Mass Transfer

View full text Add to dashboard Cite

Estimation of Thermal Barrier Coating Surface Temperature and Heat Flux Profiles in a Low Temperature Combustion Engine Using a Modified Sequential Function Specification Approach

Cited by 13 publications

References 15 publications

Experimental investigation of the relationship between thermal barrier coating structured porosity and homogeneous charge compression ignition engine combustion

Experimental investigation of the relationship between thermal barrier coating structured porosity and homogeneous charge compression ignition engine combustion

Inverse Analysis of In-Cylinder Gas-Wall Boundary Conditions: Investigation of a Yttria-Stabilized Zirconia Thermal Barrier Coating for Homogeneous Charge Compression Ignition

Estimation of moving heat source for an instantaneous three-dimensional heat transfer system based on step-renewed Kalman filter

Contact Info

Product

Resources

About