Quantifying liquid boundary and vapor distributions in a fuel spray by rainbow schlieren deflectometry [electronic resource]

• Ngôn ngữ: eng
• Ký hiệu phân loại: 629.89 Computer control
• Thông tin xuất bản: Washington, D.C. : Oak Ridge, Tenn. : United States. Dept. of Energy. Office of Energy Efficiency and Renewable Energy ; Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2017
• Mô tả vật lý: Size: Article No. 8385 : , digital, PDF file.
• Bộ sưu tập: Metadata
• ID: 265891
• Chủ đề: 1. 33 advanced propulsion systems; 2. 42 engineering; 3. Combustion diagnostics; 4. Lasers; 5. Moir� techniques

Tóm tắt

The rainbow schlieren deflectometry (RSD) technique is used to determine the liquid boundary and the fuel volume fraction distributions in the vapor region of a high-pressure fuel spray. Experiments were conducted in a constant pressure flow vessel, whereby a customized single-hole common-rail diesel injector is used to introduce n-heptane fuel into a coflow of low-speed ambient air at two different test conditions. Only the quasi-steady period of the fuel spray is considered, and multiple injections are performed to acquire statistically significant data at an image acquisition rate of 20 kHz. An algorithm to identify the liquid boundary using intensity recorded by the RSD images is presented. The results are compared against measurements obtained by the Mie scattering technique. Our results demonstrate that the RSD can be a powerful optical diagnostics technique to simultaneously quantify both the vapor and liquid regions in the high-pressure fuel sprays.