VMFRT004

Overview

Reference	Retrieved from Engine Combustion Network data search utility: https://ecn.sandia.gov/ecn-data-search/ Accessed on April 7, 2020. Find relevant data and information by choosing the parameters highlighted in gray below on the ECN data search utility.

Solver	Ansys Forte
Physics/Models	Engine Combustion Network (ECN) Nonreacting Flow Case bkldaAL4
Input Files	`P_150MPa_NR.ftsim`
Project Files	Link to Project Files Download Page

Test Case

This test recreates the Engine Combustion Network (ECN) Spray A target case characterized by high-pressure liquid fuel injection in conditions relevant to diesel engines. In this case, the combustion chamber has a cubical shape (length = 10.8 cm), the oxygen content is zero, and the difference between the fuel injector pressure and ambient gas pressure is 150 MPa. The fuel entering the combustion chamber through the spray injector is n-dodecane (nC12). The model includes two refined regions of respectively, 2 mm and 1 mm, around the jet. The table below lists the setup parameters for the experiment and simulation.

Additional test details can be found on the ECN web site. The experimental data for the vapor and liquid penetration lengths can be found in the form of text files on the ECN site at the following links:

The modeling predictions for vapor and liquid penetration lengths are compared with the experimental results including error bars in Figure 205: Vapor and liquid penetration length.

Test case properties
P_inj	M_inj	Duration_inj	V_amb	ρ_amb	Composition_amb	P_amb	T_amb	T_fuel	D_nozzle
150 MPa	13.77 mg	6 ms	20 cm/s	22.8 kg/m³	N₂ = 89.71% CO₂ = 6.52% H₂O = 3.77%	6.05 MPa	900 K	373 K	0.084 mm
Simulation Settings
RT_dist	v_inj profile	Spray initialization model	L/D	R/D	SAM on ∇T∇Vel∇Y*^[a]	Turbulence model	Mesh size_MAX	dt_initial
2.2	Flat	Nozzle flow	11.9	0.238	0.5 mm	RANS RNG-kϵ	4 mm	1E-7 s

^[a]Y*=Fuel Vapor Mass Fraction

Results Comparison

Figure 205: Vapor and liquid penetration length