Accession Number : ADA039357


Title :   Electro-Optical Techniques for Diesel Engine Research


Descriptive Note : Final rept. Sep 1971-Jun 1975


Corporate Author : ARO INC ARNOLD AFS TN


Personal Author(s) : Lennert, A E ; Sowls, R E ; Belz, R A ; Goethert, W H ; Bentley, H T


Full Text : http://www.dtic.mil/get-tr-doc/pdf?AD=ADA039357


Report Date : May 1977


Pagination or Media Count : 163


Abstract : The results of research to determine the feasibility of applying electro-optical diagnostic techniques to the study of combustion phenomena in diesel engines is described and evaluated. The techniques that were investigated included: high-speed laser-augmented photography, holography, fringe techniques (laser anemometry and particle sizing), mass spectroscopy, and resonance absorption. A conventional Army TACOM diesel engine and a Turner engine were modified to acquire optical access by installing quartz windows in the combustion chamber. Droplet formation, breakup, combustion, and flow phenomena were observed in the combustion chamber in three dimensions using holographic techniques, whereas conventional high-speed photography provided only information in a plane. It was established that two-dimensional velocity measurements can readily be made in the combustion chamber but that additional development is required on the prototype particle-sizing instrument. The formation of certain hydorcarbones was observed in real time using resonance absorption techniques with a narrow-line, tunable helium-neon laser. Species determination, including total temperature, was realized with the application of mass spectroscopy.


Descriptors :   *DIAGNOSTIC EQUIPMENT , *DIESEL ENGINES , *ELECTROOPTICS , ANEMOMETERS , CHEMICAL REACTIONS , COMBUSTION , DIAGNOSIS(GENERAL) , HIGH SPEED PHOTOGRAPHY , HOLOGRAPHY , INFRARED SPECTROSCOPY , INTERFEROMETRY , LASERS , MASS SPECTROMETERS , PARTICLE SIZE , RAMAN SPECTROSCOPY , REACTION KINETICS , RESONANCE ABSORPTION


Subject Categories : Optics
      Air Breathing Engines(unconventional)
      Combustion and Ignition


Distribution Statement : APPROVED FOR PUBLIC RELEASE