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Results for “Numerical”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Numerical and experimental analysis of the Young’s modulus of cold compacted powder materials
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Numerical study of damage in particulate composites during high-strain rate loading using novel damage model
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Experimental and numerical investigation of torsion fatigue of a nickel-based alloy at elevated temperature
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A study of propagation of spherically expanding and counterflow laminar flames using direct measurements and numerical simulations
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Numerical and experimental investigation of turbulent DME jet flames
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Direct numerical simulations of probe effects in low-pressure flame sampling
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An Experimental and Numerical Investigation to Characterize the Low-Temperature Heat Release in Stoichiometric and Lean Combustion
This work reports on an experimental and modeling study on the low-temperature heat release (LTHR) characteristics for three RON 90 binary blends (n-heptane blended with isooctane, toluene and ethanol) in a Cooperative Fuel Research (CFR) engine at lean and stoichiometric conditions that are representative of homogeneous charge compression ignition (HCCI) and spark-ignition (SI) end-gas combustion conditions, respectively. An analysis of the end-gas temperature-pressure (T-P) trajectories was performed to identify the intake conditions leading to similar T-P trajectories between the two lambdas for each fuel blend. A heat release analysis was then conducted for the identified cases, where fuel-to-fuel differences in LTHR were identified and found to be sensitive to the operating condition. Simulations were conducted for these cases using a recently updated chemical kinetic model and a 0-D engine model, where good qualitative and reasonable quantitative agreements in LTHR were obtained. Sensitivity analysis was also performed directly on the rates of LTHR, to understand the controlling chemical reactions of LTHR, providing further insights into the fuel-to-fuel differences. The results demonstrate the significant promoting effect of n-heptane on LTHR rates, while inhibiting effects were seen for ethanol and toluene. Also highlighted was the importance of H atom abstraction reactions from the chemistry of each fuel component, which could lead to contradictory fuel behavior depending on the locations of the H site of the abstraction reaction due to the different ensuing pathways for the primary fuel radicals.
KINETIC AND NUMERICAL STUDY ON THE EFFECTS OF DI-TERT-BUTYL PEROXIDE ADDITIVE ON THE REACTIVITY OF METHANOL AND ETHANOL
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Optical, Structural, and Numerical Investigations of GaAs/AlGaAs Core-Multishell Nanowire Quantum Well Tubes
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Three-Dimensional Numerical Analysis on Blade Response of a Vertical-Axis Tidal Current Turbine Under Operational Conditions
Abstract not provided