Title: Inter-plume aerodynamics for gasoline spray collapse

Abstract

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 plumemore » interaction. Plume direction progressively shifts toward the injector axis with time, demonstrating that the plume interaction and collapse are inherently transient.« less

Authors:

Sphicas, Panos ^[1]; Pickett, Lyle M. ^[2]; Skeen, Scott A. ^[2]; Frank, Jonathan H. ^[2]

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+ Show Author Affiliations

1. Prince Mohammad Bin Fahd Univ., Dhahran (Saudi Arabia). Mechanical Engineering Dept.
2. Sandia National Lab. (SNL-CA), Livermore, CA (United States). Engine Combustion

Publication Date:

Fri Nov 10 00:00:00 EST 2017

Research Org.:

Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Sponsoring Org.:

USDOE National Nuclear Security Administration (NNSA)

OSTI Identifier:

1411604

Report Number(s):

SAND-2017-6297J
Journal ID: ISSN 1468-0874; 654498

Grant/Contract Number:  

AC04-94AL85000

Resource Type:

Accepted Manuscript

Journal Name:

International Journal of Engine Research

Additional Journal Information:

Journal Volume: 19; Journal Issue: 10; Journal ID: ISSN 1468-0874

Publisher:

SAGE

Country of Publication:

United States

Language:

English

Subject:

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