A Fuel-Sensitive Reduced-Order Model (ROM) for Piston Engine Scaling Analysis

Report No. ARL-TR-8172
Authors: Drew Culpepper; Luis Bravo; Simon Su
Date/Pages: September 2017; 56 pages
Abstract: The objective of this research is to establish a novel reduced-order model (ROM) for engine liquid-length scaling analysis and to assess its validity over ranges relevant to US Army vehicle-propulsion platforms. The formulation stems from the well-known Siebersâ?? model for diesel sprays that applies heat and mass transfer principles for zero-dimensional, mixing-limited conditions. This work extends this foundational model to include 1-D transient framework with multiphysics capability. Fuel libraries have been developed including pure fuels like n-dodecane, cetane, and tetradecane and also surrogate mixtures to emulate jet-propellant (JP-8) fuel properties. Companion computational fluid dynamics simulations resolving the transient 3-D spray behavior have been performed to validate the model. Further vetting was conducted against measurements for the various cases of interest. The cases include an evaporating single-plume spray and a single-cylinder moving piston case near top dead center at diesel-engine conditions. The ROM provides a real-time engineering analytical tool for liquid-length scaling that may be used toward optimizing engine performance.
Distribution: Approved for public release
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Last Update / Reviewed: September 1, 2017