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Effects of Distortion on Trajectory of Diesel Particulate Matter (PM) from Mobile Sources.
| 题名： | Effects of Distortion on Trajectory of Diesel Particulate Matter (PM) from Mobile Sources. |
| 关键词： | mobile；matte；source；late；ects；tort；cula；centration；part；dies |
| 摘要： | Laboratory and field measurements were performed to understand the effects of local urban aerodynamics on PM concentration. For the laboratory experiments, an open-circuit wind tunnel along with exhaust from a small diesel engine were used. The ratios of the exhaust mean velocity to the free stream mean velocity were 12.4, 5.7, and 3.9. The blockage models were a rectangular object and a cylinder with nearly the same projected area, spanning the height of the wind tunnel cross section at the mid-section. The field measurements were performed along the Alameda Corridor railroad at the Commodore Heim Bridge, at the intersection of the Henry Ford and Anchorage roads. The field tests were performed under the bridge adjacent to the control room at the location where distortion due to the building structure was present. The overall results indicate that the PM concentration is a function of the local wind speed and direction and the blockage effect. Increased wind toward the structures and higher blockage results in increased PM concentration. Based on the laboratory results, an exponential function has been proposed for prediction of the PM concentration with respect to the local mean velocity and distance from obstructions. However, further field tests are recommended for various locations and structures for development of a more generalized model for predicting PM concentration within urban areas. |
| 报告类型： | 科技报告 |
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