Planar Visuallization and Vapor and Liquid in a Spray Plume (Phase II)
- Energy Research Consultants, Laguna Hills, CA (United States)
An absorption and scattering based diagnostic to measure fuel vapor in the presence of fuel droplets was assembled and demonstrated. Two laser wavelengths pairs are used collocated in space on top of each other. One wavelength is absorbed by the fuel vapor. Since the vapor absorbing wavelength is also attenuated by liquid fuel drops, this attenuation due to the liquid can be removed by using a second wavelength that is attenuated by liquid fuel drops but not absorbed by fuel vapor. To extend the flexibility of the system to work in non-isothermal environments, including burning sprays, the ability to measure temperature within the spray plume was also incorporated. This is accomplished using two absorption lines for either water or fuel vapor one of which is temperature dependent and one which is less temperature dependent. The significant advantage of using absorption (vs scattering or fluorescence) to measure vapor or temperature is that many of the confounding challenges associated with multiple scattering, incident beam attenuation, and signal attenuation by the spray are completely avoided. The spray density is only limited by the ability of some reasonable level of light (as little as ~1-5%) to pass through it. Choosing wavelength pairs that are as close as possible is important to minimize error. Various pairs of wavelengths were established with which to measure temperature and vapor concentration at both optically thin and thick conditions. The basic configuration is a line of sight setup. But spatial resolution, including extension to planar results is accomplished using multiple measurement paths combined with tomographic reconstruction techniques. The line of sight nature of these measurements requires minimal optical access, which may not be the case with other techniques. Automotive type injectors were used in these demonstrations along with 87 octane gasoline as the test liquid. The multicomponent fuel was chosen due to its practical transportation use throughout the US and the world. Other techniques may require a single component fuel, limiting the practical application of other techniques. Care was taken to compare the absorption scattering technique to other techniques to confirm its accuracy. The goals of the project were largely met.
- Research Organization:
- Energy Research Consultants, Laguna Hills, CA (United States)
- Sponsoring Organization:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Vehicle Technologies Office
- DOE Contract Number:
- SC0011961
- OSTI ID:
- 1580439
- Type / Phase:
- SBIR (Phase II)
- Report Number(s):
- ERC-SB6a-19-1(a)
- Country of Publication:
- United States
- Language:
- English
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