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Inter-plume aerodynamics for gasoline spray collapse

Journal Article · · International Journal of Engine Research
 [1];  [2];  [2];  [2]
  1. Prince Mohammad Bin Fahd Univ., Dhahran (Saudi Arabia). Mechanical Engineering Dept.
  2. Sandia National Lab. (SNL-CA), Livermore, CA (United States). Engine Combustion
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The collapse or merging of individual plumes of direct-injection gasoline injectors is of fundamental importance to engine performance because of its impact on fuel–air mixing. But, the mechanisms of spray collapse are not fully understood and are difficult to predict. The purpose of this work is to study the aerodynamics in the inter-spray region, which can potentially lead to plume collapse. High-speed (100 kHz) particle image velocimetry is applied along a plane between plumes to observe the full temporal evolution of plume interaction and potential collapse, resolved for individual injection events. Supporting information along a line of sight is obtained using simultaneous diffused back illumination and Mie-scatter techniques. Experiments are performed under simulated engine conditions using a symmetric eight-hole injector in a high-temperature, high-pressure vessel at the “Spray G” operating conditions of the engine combustion network. Indicators of plume interaction and collapse include changes in counter-flow recirculation of ambient gas toward the injector along the axis of the injector or in the inter-plume region between plumes. Furthermore, the effect of ambient temperature and gas density on the inter-plume aerodynamics and the subsequent plume collapse are assessed. Increasing ambient temperature or density, with enhanced vaporization and momentum exchange, accelerates the plume interaction. Plume direction progressively shifts toward the injector axis with time, demonstrating that the plume interaction and collapse are inherently transient.
Research Organization:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC04-94AL85000
OSTI ID:
1411604
Report Number(s):
SAND--2017-6297J; 654498
Journal Information:
International Journal of Engine Research, Journal Name: International Journal of Engine Research Journal Issue: 10 Vol. 19; ISSN 1468-0874
Publisher:
SAGECopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (6)

Development of limited-view tomography for measurement of Spray G plume direction and liquid volume fraction journal January 2020
Quantitative measurements of preferential evaporation effects of multicomponent gasoline fuel sprays at ECN Spray G conditions journal March 2019
Validation of a comprehensive computational fluid dynamics methodology to predict the direct injection process of gasoline sprays using Spray G experimental data journal August 2019
Effect of engine conditions and injection timing on piston-top fuel films for stratified direct-injection spark-ignition operation using E30 journal September 2019
Analysis of the interaction of Spray G and in-cylinder flow in two optical engines for late gasoline direct injection journal October 2019
Large-eddy spray simulation under direct-injection spark-ignition engine-like conditions with an integrated atomization/breakup model journal January 2020

Figures / Tables (19)

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Related Subjects

33 ADVANCED PROPULSION SYSTEMS
42 ENGINEERING
Mie-scatter
diffused-back-illumination
gasoline spray
high-speed particle image velocimetry
multi-plume spray
spray collapse