A novel method for correction of temporally- and spatially-variant optical distortion in planar particle image velocimetry [electronic resource]

• Ngôn ngữ: eng
• Ký hiệu phân loại: 629.13 Aeronautics
• 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, 2016
• Mô tả vật lý: Size: Article No. 085201 : , digital, PDF file.
• Bộ sưu tập: Metadata
• ID: 265922
• Chủ đề: 1. 33 advanced propulsion systems; 2. Optical distortion; 3. Particle image velocimetry; 4. Re-entrant piston geometry; 5. Swirl-plane

Tóm tắt

In-cylinder flow measurements are necessary to gain a fundamental understanding of swirl-supported, light-duty Diesel engine processes for high thermal efficiency and low emissions. Planar particle image velocimetry (PIV) can be used for non-intrusive, in situ measurement of swirl-plane velocity fields through a transparent piston. In order to keep the flow unchanged from all-metal engine operation, the geometry of the transparent piston must adapt the production-intent metal piston geometry. As a result, a temporally- and spatially-variant optical distortion is introduced to the particle images. Here, to ensure reliable measurement of particle displacements, this work documents a systematic exploration of optical distortion quantification and a hybrid back-projection procedure that combines ray-tracing-based geometric and in situ manual back-projection approaches.