Spatial resolution of fuel distribution in an engine using infrared absorption

An investigation of the vapor phase concentration is performed using the Infrared Extinction (IRE) technique on an ethanol spray injected into a heated environment. Experiments are carried out on a confined geometry behind a real-scale injection system. It is composed of a pressure atomizer and an air swirler. The first part of the paper describes the fundamentals of the measurement technique and the experimental procedure. To obtain spatially resolved results, a deconvolution procedure based on Abels algorithm and Tikhonovs regularization is developed. In the second part, the steady measurements performed downstream from the injector provide the radial evolution of the integral vapor molar concentration for various different air temperatures. In addition, a spectral analysis of time-resolved recordings shows that the liquid droplets are moving with the frequency of the Precessing Vortex Core (PVC). In the last part of the article, the local measured values of concentration are compared with the numerical ones. Firstly, the numerical approach is validated for the pure gaseous and two-phase flow behavior. Secondly, the experimental and numerical vapor molar concentrations are presented and discussed.

show abstract

“…After 1995, IRE has been applied to different multiphase flows, such as fuel sprays in engines [15], [16] and detection of aerosols [17].…”

Section: State Of the Art Of The Infrared Extinction Techniquementioning

confidence: 99%

Application of the Infrared Extinction to a Swirled Air/Ethanol Spray Downstream From a Turbojet Injection System

Bodoc

Rouzaud²

2018

Atomiz Spr

View full text Add to dashboard Cite

show abstract

Hydrocarbon absorption coefficients at the 339-μm He-Ne laser transition

Drallmeier¹

2003

Appl. Opt.

View full text Add to dashboard Cite

In view of the application of light-extinction techniques for fuel-specie-concentration measurements in combustion systems, the vapor-absorption coefficient of several hydrocarbon species at the 3.39-microm He-Ne laser transition has been measured. The hydrocarbon species include paraffins, olefins, and aromatics. Result are included for total pressure over the range of approximately 200-650 Torr at 295 K with air as the buffer gas. Observations are made regarding the difference in the absorption coefficient within and between hydrocarbon classifications.

show abstract