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Title: Determination of diesel spray axial velocity using x-ray radiography.

Abstract

Present knowledge of the velocity of the fuel in diesel sprays is quite limited due to the obscuring effects of fuel droplets, particularly in the high-density core of the spray. In recent years, x-ray radiography, which is capable of penetrating dense fuel sprays, has demonstrated the ability to probe the structure of the core of the spray, even in the dense near-nozzle region. In this paper, x-ray radiography data was used to determine the average axial velocity in diesel sprays as a function of position and time. Here, we report the method used to determine the axial velocity and its application to three common-rail diesel sprays at 250 bar injection pressure. The data show that the spray velocity does not reach its steady state value near the nozzle until approximately 200 {micro}s after the start of injection. Moreover, the spray axial velocity decreases as one moves away from the spray orifice, suggesting transfer of axial momentum to the surrounding ambient gas.

Authors:
; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
EE
OSTI Identifier:
979545
Report Number(s):
ANL/ES/CP-58168
TRN: US201010%%761
DOE Contract Number:
DE-AC02-06CH11357
Resource Type:
Conference
Resource Relation:
Conference: SAE 2007 World Congress; Apr. 16, 2007 - Apr. 19, 2007; Detroit, MI
Country of Publication:
United States
Language:
ENGLISH
Subject:
33 ADVANCED PROPULSION SYSTEMS; NOZZLES; PROBES; VELOCITY; X-RAY RADIOGRAPHY; DIESEL FUELS; SPRAYS

Citation Formats

Kastengren, A. L., Powell, C. F., Cheong, S-K, Wang, Y, Im, K-S, Liu, X, Wang, J, Riedel, T, and Robert Bosch GmbH. Determination of diesel spray axial velocity using x-ray radiography.. United States: N. p., 2007. Web.
Kastengren, A. L., Powell, C. F., Cheong, S-K, Wang, Y, Im, K-S, Liu, X, Wang, J, Riedel, T, & Robert Bosch GmbH. Determination of diesel spray axial velocity using x-ray radiography.. United States.
Kastengren, A. L., Powell, C. F., Cheong, S-K, Wang, Y, Im, K-S, Liu, X, Wang, J, Riedel, T, and Robert Bosch GmbH. Mon . "Determination of diesel spray axial velocity using x-ray radiography.". United States. doi:.
@article{osti_979545,
title = {Determination of diesel spray axial velocity using x-ray radiography.},
author = {Kastengren, A. L. and Powell, C. F. and Cheong, S-K and Wang, Y and Im, K-S and Liu, X and Wang, J and Riedel, T and Robert Bosch GmbH},
abstractNote = {Present knowledge of the velocity of the fuel in diesel sprays is quite limited due to the obscuring effects of fuel droplets, particularly in the high-density core of the spray. In recent years, x-ray radiography, which is capable of penetrating dense fuel sprays, has demonstrated the ability to probe the structure of the core of the spray, even in the dense near-nozzle region. In this paper, x-ray radiography data was used to determine the average axial velocity in diesel sprays as a function of position and time. Here, we report the method used to determine the axial velocity and its application to three common-rail diesel sprays at 250 bar injection pressure. The data show that the spray velocity does not reach its steady state value near the nozzle until approximately 200 {micro}s after the start of injection. Moreover, the spray axial velocity decreases as one moves away from the spray orifice, suggesting transfer of axial momentum to the surrounding ambient gas.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}

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  • The near-nozzle structure of several nonevaporating biodiesel-blend sprays has been studied using X-ray radiography. Radiography allows quantitative measurements of the fuel distribution in sprays to be made with high temporal and spatial resolution. Measurements have been made at different values of injection pressure, ambient density, and with two different nozzle geometries to understand the influences of these parameters on the spray structure of the biodiesel blend. These measurements have been compared with corresponding measurements of Viscor, a diesel calibration fluid, to demonstrate the fuel effects on the spray structure. Generally, the biodiesel-blend spray has a similar structure to the spraymore » of Viscor. For the nonhydroground nozzle used in this study, the biodiesel-blend spray has a slightly slower penetration into the ambient gas than the Viscor spray. The cone angle of the biodiesel-blend spray is generally smaller than that of the Viscor spray, indicating that the biodiesel-blend spray is denser than the Viscor spray. For the hydroground nozzle, both fuels produce sprays with initially wide cone angles that transition to narrow sprays during the steady-state portion of the injection event. These variations in cone angle with time occur later for the biodiesel-blend spray than for the Viscor spray, indicating that the dynamics of the injector needle as it opens are somewhat different for the two fuels.« less
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  • No abstract prepared.