Sep, 2026
Conference Paper
Publications
Showing 18 results for Author: Eric J. Nafziger
Jun, 2025
Conference Paper
Enterprise: a reduced-scale, flexible fuel, single-cylinder crosshead marine diesel research engine
A custom-built 1/10 scale, flexible-fuel, single-cylinder crosshead marine diesel research engine, dubbed the Enterprise, was designed and built as a platform for conducting marine lubricant research. The engine design was focused on maintaining lubricant boundary conditions similar those of full-scale engines. The Enterprise has a rated speed of 625 rpm to match the linea…
Dec, 2023
Conference Paper
Evaluating Efficiency and Security of Connected and Autonomous Vehicle Applications
Evaluating efficiency and security of Connected and Autonomous Vehicles (CAVs) requires an environment that can support applications and measurements under real-world conditions. This work introduces our implementation and evaluation of a Connected and Autonomous Vehicle Research Environment (CAVRE). We implement and evaluate an existing CAV application called Cooperative…
Dec, 2023
Journal
Exploring the potential benefits of high-efficiency dual-fuel combustion on a heavy-duty multi-cylinder engine for SuperTruck I
In support of the Daimler SuperTruck I team’s 55% brake thermal efficiency (BTE) pathway goal, researchers at Oak Ridge National Laboratory performed an experimental investigation of the potential efficiency and emissions benefits of dual-fuel advanced combustion approaches on a modified heavy-duty 15-L Detroit™ DD15 engine. For this work, a natural gas port fuel injection…
Nov, 2023
Journal
Total variation-based neutron computed tomography
We perform the neutron computed tomography reconstruction problem via an inverse problem formulation with a total variation penalty. In the case of highly under-resolved angular measurements, the total variation penalty suppresses high-frequency artifacts which appear in filtered back projections. In order to efficiently compute solutions for this problem, we implement a v…
Nov, 2023
Journal
Quantification of Sub-Pixel Dynamics in High-Speed Neutron Imaging
The high penetration depth of neutrons through many metals and other common materials makes neutron imaging an attractive method for non-destructively probing the internal structure and dynamics of objects or systems that may not be accessible by conventional means, such as X-ray or optical imaging. While neutron imaging has been demonstrated to achieve a spatial resolutio…
Nov, 2023
Journal
Measurement of Piston Deposit Thickness Using Laser Profilometer
A novel method of measuring the thickness of deposits on engine pistons, including within ring grooves, is described. A laser profilometer is used in conjunction with a rotary stage to measure a continuous profile of the piston with deposits, and the measurement is repeated after cleaning the deposits from the piston. Algorithms for aligning the scans and determining the d…
Nov, 2023
Conference Paper
Measurement of needle and armature dynamics in a gasoline direct injector by high-speed neutron imaging
Nov, 2023
Conference Paper
Lubricant impacts on piston deposit formation in the Enterprise marine diesel research engine
The impact of lubricant formulation on piston deposits was studied using the Enterprise, a reduced-scale, single-cylinder, two-stroke crosshead marine diesel research engine. The Enterprise engine was specially designed for marine diesel lubricant research, with a custom reduced-scale cylinder lubricant injection system and extensive instrumentation of thermal boundary con…
Nov, 2023
Journal
Measurement of needle and armature dynamics in a gasoline direct injector by high-speed neutron imaging
In modern spark ignition engines, precise delivery of fuel with gasoline direct injection has become increasingly important in the effort to meet ever stricter efficiency and emissions regulations. Use of multiple small close-coupled injections has become more common in attempt to precisely control fuel distribution in the cylinder, but these strategies are hindered by non…