A5078593089- Advanced Combustion Engine Technologies
- Combustion and flame dynamics
- Vehicle emissions and performance
- Catalytic Processes in Materials Science
- Nuclear Physics and Applications
- Biodiesel Production and Applications
- Nuclear reactor physics and engineering
- Heat transfer and supercritical fluids
- Nuclear Materials and Properties
- Catalysis and Oxidation Reactions
- Radiation Detection and Scintillator Technologies
- Metal and Thin Film Mechanics
- Combustion and Detonation Processes
- Rocket and propulsion systems research
- Cellular and Composite Structures
- High-pressure geophysics and materials
- Fusion materials and technologies
- Electrohydrodynamics and Fluid Dynamics
- Chemical Thermodynamics and Molecular Structure
- Tribology and Lubrication Engineering
- Metallurgy and Material Forming
- Advanced Sensor Technologies Research
- Atomic and Subatomic Physics Research
- Microfluidic and Capillary Electrophoresis Applications
- Mechanical Engineering and Vibrations Research
SHINE Medical Technologies (United States)
2024
Oak Ridge National Laboratory
2017-2023
University of Wisconsin–Madison
2011-2016
University of California, Berkeley
2011-2012
Reactivity controlled compression ignition (RCCI) has been shown to be capable of providing improved engine efficiencies coupled with the benefit low emissions via in-cylinder fuel blending. Much previous body work studied use gasoline as premixed low-reactivity fuel. However, there is interest in exploring alternative fuels advanced combustion strategies. Due strong market growth natural gas a both mobile and stationary applications, study on methane for RCCI was performed. Single cylinder...
Experiments were performed to investigate injection strategies for improving engine-out emissions of RCCI combustion in a heavy-duty diesel engine. Previous studies using port-injected low-reactivity fuel (e.g., gasoline or iso-octane) and direct-injected high-reactivity n-heptane) have reported greater than 56% gross indicated thermal efficiency while meeting the EPA 2010 PM NOx regulations in-cylinder. However, CO UHC higher combustion. This increase is thought be caused by crevice flows...
Low-temperature combustion offers an attractive combination of high thermal efficiency and low NO x soot formation at moderate engine load. However, the kinetically-controlled nature low-temperature yields little authority over rate heat release, resulting in a tradeoff between load, noise, efficiency. While several single-fuel strategies have achieved full-load operation through use equivalence ratio stratification, they uniformly require retarded phasing to maintain reasonable noise...
The present experimental engine efficiency study explores the effects of intake pressure and temperature, premixed global equivalence ratios on gross thermal (GTE) using reactivity controlled compression ignition (RCCI) combustion strategy. Experiments were conducted in a heavy-duty single-cylinder at constant net load (IMEPn) 8.45 bar, 1300 rev/min speed, with 0% EGR, 50% mass fraction burned phasing (CA50) 0.5 CA ATDC. was port fueled E85 for low fuel direct injected 3.5% 2-ethylhexyl...
Reactivity-controlled compression ignition (RCCI) is a dual-fuel variant of low-temperature combustion that uses in-cylinder fuel stratification to control the rate reactions occurring during combustion. Using fuels varying reactivity (autoignition propensity), gradients can be established within charge, allowing for over phasing and duration high efficiency while achieving low NO x soot emissions. In practice, this typically accomplished by premixing low-reactivity fuel, such as gasoline,...
This work compares the fundamental thermodynamic underpinnings (i.e. working fluid properties and heat release profile) of various combustion strategies with engine measurements. The approach employs a model that separately tracks impacts on efficiency due to differences in rate addition, volume change, mass molecular weight change for given combination fluid, profile, geometry. Comparative analysis between measured modeled efficiencies illustrates sources reductions or opportunities...
The Oak Ridge National Laboratory is planning to build the Second Target Station (STS) at Spallation Neutron Source (SNS). STS will host a suite of novel instruments that complement First Station's beamline capabilities by offering an increased flux for cold neutrons and broader wavelength bandwidth. A neutron imaging beamline, named Complex, Unique, Powerful Imaging Instrument Dynamics (CUPI2D), among first eight be commissioned as part construction project. CUPI2D designed broad range...
Reactivity controlled compression ignition (RCCI) has been shown to be capable of providing improved engine efficiencies coupled with the benefit low emissions via in-cylinder fuel blending. Much previous body work studied use gasoline as premixed low-reactivity fuel. However, there is interest in exploring alternative fuels advanced combustion strategies. Due strong market growth natural gas a both mobile and stationary applications, study on methane for RCCI was performed. Single cylinder...
<div class="section abstract"><div class="htmlview paragraph">Polyoxymethylene dimethyl ethers (PODEs) have shown promise as candidates for diesel fuel blendstocks due to their low sooting tendency, high cetane number, and diesel-comparable boiling point range. However, there is a lack of literature regarding compatibility PODEs with common automotive elastomers, which would be prerequisite adoption into the marketplace. To address this need, an exposure study complementary...
Engineering neutron diffraction can nondestructively and noninvasively probe stress, strain, temperature, phase evolutions deep within bulk materials. In this work, we demonstrate operando lattice strain measurement of internal combustion engine components by diffraction. A modified commercial generator was mounted in the VULCAN diffractometer at Spallation Neutron Source, strains both cylinder block head were measured under static nonfiring conditions as well steady state cyclic transient...
Experimental work on reactivity-controlled compression ignition (RCCI) in a small-bore, multicylinder engine operating premixed iso-octane, and direct-injected n-heptane has shown an unexpected combustion phasing advance at early injection timings, which not been observed large-bore engines under RCCI similar conditions. In this work, computational fluid dynamics (CFD) simulations were performed to investigate whether spray–wall interactions could be responsible for result. Comparison of the...
<div class="section abstract"><div class="htmlview paragraph">Modern spark ignition internal combustion engines rely on fast rates and high dilution to achieve brake thermal efficiencies. To accomplish this, new engine designs have moved towards increased tumble ratios stroke-to-bore ratios. Increased correlate positively with increases in turbulent kinetic energy improved fuel residual gas mixing, all of which favor faster more efficient combustion. Longer allow higher geometric...
Experimental work on reactivity-controlled compression ignition (RCCI) in a small-bore, multi-cylinder engine operating premixed iso-octane and direct-injected n-heptane has shown an unexpected combustion phasing advance at early injection timings, which not been observed large-bore engines under RCCI similar conditions. In this work, computational fluid dynamics (CFD) simulations were performed to investigate whether spray-wall interactions could be responsible for result. Comparison of the...