Effects of Ambient Conditions and Nozzle Design on the Velocity of Clustered Diesel Jets

作     者：Thorsten Brands Peter Hottenbach Hans-Jargen Ko Gerd Griinefeld Stefan Pischinger Philipp Adomeit 

作者机构：Institute of Laser-Diagnostics in Thermofluiddynamics RWTH Aachen University Aachen 52062 Germany Institute of Technical Thermodynamics RWTH Aachen University Aachen 52062 Germany Institute for Combustion Engines RWTH Aachen University Aachen 52062 Germany FEV Motorentechnik GmbH Aachen 52078 Germany 

出 版 物：《Journal of Physical Science and Application》 (物理科学与应用（英文版）)

年 卷 期：2013年第3卷第5期

页      码：279-286页

摘      要：The measurement of droplet velocities in Diesel sprays close to the nozzle is important because of the complexity of in-nozzle flow, spray break-up and evaporation. However, the measurement of droplet velocities in the dense region of Diesel sprays is very difficult or impossible by means of widely used laser diagnostic techniques, in particular under engine-like high-pressure and high-temperature conditions. The limitations of phase Doppler anemometry （PDA） and particle image velocimetry （PIV） prevent the application to the ultra-dense region of the spray. It was demonstrated that these problems can be greatly reduced by the laser flow tagging （LFT） technique. It was also demonstrated recently that LFT measurements can be conducted in clustered Diesel jets with improved spatial resolution and increased number of simultaneous measurements in the near-nozzle region. In the present work, the nozzle design, the temperature and pressure of the ambient air, and the fuel rail pressure are varied, in order to investigate the influence on the near-nozzle jet velocity and the underlying physical mechanisms.

主 题 词：Laser flow tagging velocimetry diesel fuel injection cluster nozzles engine-like conditions 

学科分类：0810[工学-土木类] 0821[工学-兵器类] 08[工学] 081002[081002] 082101[082101] 

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