Lagrangian Modeling of Evaporating Sprays at Diesel Engine Conditions: Effects of Multi-Hole Injector Nozzles With JP-8 Surrogates
Abstract
Numerical modeling of the evaporation process in sprays under diesel conditions is key for the development of efficient injection strategies and to increase combustion efficiency. In this study, three-dimensional numerical simulations of single and two-hole injector nozzles under diesel conditions are conducted to study the spray behavior and the effect of multi-hole nozzles on heavy fueled spray parameters and mixing. The configuration corresponds to a high-pressure JP-8 spray injected into a high temperature pressure vessel (HTPV) flow-through combustion chamber simulating realistic conditions found in diesel engines. A Lagrangian particle tracking method coupled with a classical blob injection wave-based model is adopted through the use of CONVERGE solver to treat the spray process. An Adaptive Mesh Refinement (AMR) and fixed embedding technique is employed to capture the gas-liquid interface with high fidelity while keeping the cell-count reasonable. Two JP-8 liquid fuel surrogates, Surrogate-C (of 60% n-dodecane, 20% methylcyclohexane, 20% o-xylene), and the Modified Aachen surrogate (80% n-dodecane and 20% trimethylbenze) were interrogated resulting in good agreement with high fidelity spray measurements. Spray simulation results are compared to our in-house experimental data for JP-8 with single axial hole and two-hole adjacent (60 ) nozzle configurations. Standardized Engine Combustion Network (ECN) Spray A ambient conditions, consisting of 900 K and 60 bar, are selected with a rail pressure of 1000 bar with nominal nozzle diameter =147 . Utilizing Reynolds-Average Navier Stokes, and dynamic structure Large Eddy Simulation methodologies both configurations result in a 20 mm mean liquid length for both single and two hole cases. This is in good agreement with experiments with the single, while for the double hole this is an over-prediction of 3-5 mm. The reported differences are partially attributed to the internal nozzle flow dynamics, reported
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 2014
- Accession Number
- ADA605315
Entities
People
- Chol-Bum Kweon
- Luis Bravo
- M. Kurman
- P. K. Senecal
- S. Wijeyakulasuriya
Organizations
- United States Army Research Laboratory