Shi J P, Harrison R M, Evans D E, Alam A, Barnes C, Carter G
Division of Environmental Health and Risk Management, The University of Birmingham, Edgbaston, United Kingdom.
Environ Technol. 2002 Jan;23(1):1-14. doi: 10.1080/09593332508618430.
Earlier research has demonstrated that the conditions of dilution of engine exhaust gases profoundly influence the size distribution and total number of particles emitted. Since real world dilution conditions are variable and therefore difficult to simulate, this research has sought to develop and validate a method for measuring particle number emissions from vehicles driving past on a road. This has been achieved successfully using carbon dioxide as a tracer of exhaust gas dilution. By subsequent adjustment of data to a constant dilution factor, it is possible to compare emissions from different vehicles using different technologies and fuels based upon real world emission data. Whilst further optimisation of the technique, especially in terms of matching the instrument response times is desirable, the measurements offer useful insights into emissions from gasoline and diesel vehicles, and the substantial proportion of particles emitted in the 3-7 nanometre size range.
早期研究表明，发动机废气的稀释条件对排放颗粒的尺寸分布和总数有深远影响。由于实际的稀释条件是可变的，因此难以模拟，本研究旨在开发并验证一种测量道路上行驶车辆颗粒数排放的方法。通过使用二氧化碳作为废气稀释的示踪剂，这一目标已成功实现。通过随后将数据调整到恒定的稀释因子，可以根据实际排放数据比较使用不同技术和燃料的不同车辆的排放。虽然该技术还需要进一步优化，特别是在匹配仪器响应时间方面，但这些测量为汽油车和柴油车的排放以及在3至7纳米尺寸范围内排放的大量颗粒提供了有用的见解。
