n-decane - PowerPoint PPT Presentation

層流対向流場に形成される n-decane 噴霧火炎中のすす生成特性に噴霧特性が与える影響 Effects of spray characteristics on soot formation of n-decane spray flame stabilized in the laminar counter-flow field 林潤（大阪大学）渡邊裕章（九州大学）黒瀬良一（京都大学）赤松史光（大阪大学） Combustion Engineering Lab./ Osaka Univ.

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�� Φ �� Φ �� Φ �� Φ �� φ � �� φ � �� φ � ��

�� 20 20 15 15 �� 10 10 5 �� 5 0 0 ��

�� Sweep Sweep Time Time [ms/cycle] [ms/cycle] 35 35 35 35 30 30 Frequency [kHz] Frequency [kHz] 30 30 25 25 25 25 Liquid Fuel Liquid Fuel Basic Basic Frequency Frequency Sweep Sweep Width Width 20 20 20 20 [kHz] [kHz] [kHz] [kHz] Air Air 15 15 15 15 10 10 10 10 5 5 5 5 0 0 0 0 0 0 0 0 5 5 5 5 10 10 10 10 15 15 20 20 20 20 25 25 25 25 15 15 Signal Source Signal Source 20 � �� μ � 15 PDF, [%/ μ m] Piezoelectric Piezoelectric 10 Ceramic Ceramic 5 Orifice Plate Orifice Plate 0 5 30 55 80 105 130 155 180 205 230 Droplet diamter, [ μ m] ��

�� Item Value Fuel n -decane 58 ~ 110 μ m Sauter mean diameter (d 32 ) Liquid Fuel φ l = 0.106 Equivalence Ratio Quasi Mono-DSD Droplet size distribution (DSD) � Poly-DSD LII (for soot) �� PDA (for droplets) ��

�� μ � � �� Blue flame �� Luminous flame D 32 =58 μ m �� μ � � �� Luminous flame �� Blue flame D 32 =104 μ m ��

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20 � �� μ � 1.2 15 Normalized soot formation area, [ - ] Luminous flame Luminous flame Luminous flame PDF, [%/ μ m] Monodispersedistribution 10 1.0 5 0.8 0 Blue flame Blue flame Blue flame 5 30 55 80 105 130 155 180 205 230 D 32 D 32 =104 μ m D 32 =104 μ m 32 =104 μ m 0.6 Droplet diamter, [ μ m] 32 32 32 32 32 32 32 2 0.4 20 Luminous flame Blue flame � �� μ � 0.2 15 PDF, [%/ μ m] Polydispersedistribution 10 0.0 5 60 80 100 120 140 Sauter mean diameter, [ μ m] D 32 = 104 μ m μ 0 5 30 55 80 105 130 155 180 205 230 Droplet diamter, [ μ m] ��

n-decane - PowerPoint PPT Presentation

n-decane Effects of spray characteristics on soot formation of n-decane spray flame stabilized in the laminar counter-flow field