An optical diagnostic technique based on ultraviolet absorption and schlieren for components stratification in a binary-
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RESEARCH ARTICLE
An optical diagnostic technique based on ultraviolet absorption and schlieren for components stratification in a binary‑component fuel–air mixture Wenyuan Qi1 · Yifan Zhou1 · Yuyin Zhang1 Received: 16 April 2020 / Revised: 12 September 2020 / Accepted: 19 September 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The evaporation characteristics of multi-component fuel have significant effects on the fuel–air mixing process and subsequent processes, such as ignition, combustion, and harmful pollutants emission formation. When a multi-component fuel is directly injected into the combustion chamber, spatial and temporal equivalence ratio stratification may happen due to the preferential evaporation of components with different volatilities. However, there is a lack of effective optical diagnostics of the spatial stratification in a multi-component fuel spray. In this study, new optical technique based on ultraviolet absorption and visible light schlieren (UAVS) is for the first time proposed to measure the stratification of vapor distributions stratification in a binary-component fuel spray. UAVS technique was applied to investigate the effects of mixing ratios in a binary-component fuel spray (p-xylene and n-hexane) and ambient temperature on the stratification of components with different volatilities. The results denote the UAVS technique as the effective method for the observation of stratification of a multi-component fuel spray. In this study, the stratification phenomenon was the most evident at the ratio of 1:1. At the same time, when the ambient temperature is much higher than the dew point temperature of mixture, the stratification rarely occurs, because of the rapid evaporation thus providing time not enough for preferential evaporation. Graphic abstract Dichroic Mirror
Dichroic Mirror
BP filters Diaphragm
Beam Expander
Parabolic Mirror
Constant Volume Chamber
Diffuser
ICCD for Absorption
CCD for Schlieren
Dichroic Mirror Synchronous Controller
Ultraviolet Absorption and Visible Light Schlieren
1 Introduction
* Yuyin Zhang [email protected] 1
School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Liquid fuels, such as gasoline, diesel and kerosene oils, are commonly used in the internal combustion engine, gas turbine, ramjet, liquid-fuel rocket, etc. Generally, liquid fuels injected into the combustion chamber undergo atomization, evaporation and mixing to form appropriate fuel–air mixture for the subsequent combustion (Fansler and Parrish 2015).
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Stratification of the fuel may occur during the process of the fuel–air mixture formation due to the different volatilities of fuel components. Stratification of the components distributions significantly influences the ignition, flame propagation speed, and emissions from the combustion (Swindal et al. 1995). Therefore, the investigation into stratification related issues is relevant for optimizing the controllable of co
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