抄録
In the field of automobiles, the full flow dilution system has been made the de facto standard of PM measurement. Partial flow dilution systems have been compared and improved using full flow dilution systems as benchmarks. In a previous report, it was shown that there were differences in PM measurements between these dilution systems. On the other hand, the full flow dilution system cannot be used for marine diesel engines with large exhaust gas flow rates. Since the de facto standard of PM measurement for marine diesel engines has not yet been established, it is necessary to find a certain method which guarantees reliable PM measurement results.
For this purpose, the authors proposed a method to compare the PM concentration measured simultaneously by two or more partial flow dilution systems based on ISO 8178-1/ JIS B 8008-1. In order to implement this method, the authors measured the PM concentration simultaneously by two kinds of partial flow dilution systems using two types of marine diesel engines, and compared the values of PM concentration. The results show that the values of the PM concentration measured by the systems were in agreement to within ±30 percent, thus yielding mutually confirming results.
Furthermore, the cause of these differences in PM concentration between the systems was discussed.
