衝撃波管による燃料噴霧の着火現象の研究 : 第3報

概要

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When a cetane droplets column freely falling from an ultrasonic atomizer is ignited behind a reflected shock, no ignition occurs at a temperature below ca, 1100K even if the pressure is sufficiently high (〜1 MPa). Although a higher temperature ensures ignition, no flame so luminous as to be recorded by high-speed photography appears, and even if a luminous flame lump appears, it disappears without spreading throughout the droplets column. If, on the other hand, fuel is injected into a diesel cylinder or an electric furnace, ignition occurs even at a temperature as low as 650K with a luminous flame spreading over the entire spray. Supposing that the above difference resulted from the difference in intensity of turbulent mixing of droplets with hot air, turbulence-generating rods were placed on the upstream side of the spray column. As a result, the ignition limit was lowered down to ca. 840K, and the combustion made shifted from a blue-flame mode or locally confined ignition mode into an ordinary spray combustion mode.
一般社団法人日本機械学会の論文
1990-09-25