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HIGH-PERFORMANCE DILUTION CHAMBER OF DILUTION TUNNEL FOR DIESEL PARTICULATE MEASUREMENT
HIGH-PERFORMANCE DILUTION CHAMBER OF DILUTION TUNNEL FOR DIESEL PARTICULATE MEASUREMENT
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机译：柴油机微粒测量用稀释隧道的高性能稀释室
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摘要
PURPOSE: A dilution chamber having a high efficiency of a dilution tunnel device is provided to unify distribution of air supplied through a porous pipe wall through stabilizing penetration speed of exhaust gas. CONSTITUTION: A sampling gas pipe(11) and a dilution air supplying pipe(12) are arranged. The pipes are connected to a dilution chamber(13) for mixing a sampling gas with a dilution air through a porous tube(15). Then, the mixed gas is discharged through a dilution gas discharging pipe(14). Herein, a screen tube(16) is installed on an outer side of the porous tube. The screen tube unifies air distribution in the dilution chamber through forming plural holes. Moreover, the screen tube reduces changed amount of temperature distribution at an inlet portion of the dilution air. By unifying distribution of air supplied through the porous tube wall, attachment of smoke particles on an inner wall of the porous tube is prevented.
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