Accession Number:

AD1040860

Title:

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

Descriptive Note:

Technical Report,01 Jun 2016,31 Jan 2017

Corporate Author:

US Army Research Laboratory Aberdeen Proving Ground United States

Personal Author(s):

Report Date:

2017-09-29

Pagination or Media Count:

56.0

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 Siebers 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.

Subject Categories:

  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE