Investigation of particulate formation during diesel spray combustion: CARS for diesel spray combustion. Final technical report
An experimental and analytical research program has been carried out whose objectives were to investigate strategies for using coherent anti-Stokes Raman spectroscopy (CARS) laser diagnostic techniques for detecting the vapor phase of liquid fuel sprays, determining fuel-air ratio and the degree of fuel pyrolysis. The extent to which CARS can provide valid vapor phase fuel measurements in the presence of droplets within the CARS resolution volume will determine its ultimate utility for engine measurements. Hence, the priority in this program was maintained toward investigating possible adverse droplet effects on CARS measurements. Droplets in a relevant size range (25-- 50 microns) were generated for convenience with a spray nozzle. Tests were conducted in a spray chamber at 1 atm pressure under near- saturated fuel vapor pressure conditions, with and without a toluene fuel spray turned on. For reasons of safety an inert gas, CO{sub 2}, was used to simulate O{sub 2}. It was necessary to provide reliable vapor phase CARS reference spectra for these spray studies in order to insure that spurious liquid effects were not present and known vapor phase spectra were attained. To provide these reference spectra the capability was developed of isolating, in a CARS test cell, the vapor phase of fuels that are normally liquids at room temperature and pressure. The cell could be evacuated with a vacuum pump and heated uniformly up to about 100 C. Hence, a capability was established to measure nonresonant and resonant vapor phase CARS features of normally liquid fuels over wide pressure and temperature range, needed for evaluating CARS fuel-air analysis strategies.
- Research Organization:
- United Technologies Corp., East Hartford, CT (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC04-87AL43058
- OSTI ID:
- 10114401
- Report Number(s):
- DOE/AL/43058-T6; R-91-957796-F; ON: DE92006540
- Resource Relation:
- Other Information: PBD: Sep 1991
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
DIESEL FUELS
COMBUSTION PROPERTIES
COMBUSTION PRODUCTS
RAMAN SPECTROSCOPY
PROGRESS REPORT
DIESEL ENGINES
PARTICULATES
LASER SPECTROSCOPY
FUEL-AIR RATIO
DROPLETS
TOLUENE
NITROGEN OXIDES
330705
330701
400102
400800
CHEMICAL AND SPECTRAL PROCEDURES
COMBUSTION, PYROLYSIS, AND HIGH-TEMPERATURE CHEMISTRY