小形ディーゼル機関の過渡運転時におけるピストン燃焼室壁面温度と排気の推移特性 (<小特集>エンジンシステムの新展開)

概要

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Diesel combustion and exhaust gas emissions under transient operation (when fuel amounts abruptly increased) were investigated under a wide range of operating conditions by using a newly developed gas sampling system. The relation between gas emissions and piston wall temperatures was also investigated. The results indicated that NO_x, THC and smoke showed transient behavior after the start of acceleration before reaching the steady-state condition. Of the three gases, THC was most affected by piston wall temperature ; its concentration decreased as the wall temperature increased. Criteria cycle numbers, at which gas concentration reached a steady-state value after the start of acceleration, were about 1. 2 times the cycle constant (τ^*) of the piston wall temperature for THC, and 2. 3 times in the case of smoke. A slight increase in NO_x concentrations immediately after the start of acceleration resulted in increased premixed ROHR. This was caused by a temporary increase in ignition lag under increased wall temperatures.
一般社団法人日本機械学会の論文
1995-10-25