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首页> 外文会议>ASME Internal Combustion Engine Division technical conference >COMPARISON OF SOOT EVOLUTION USING HIGH-SPEED CMOS COLOR CAMERA AND TWO-COLOR THERMOMETRY IN AN OPTICAL DIESEL ENGINE FUELED WITH B20 BIODIESEL BLEND AND ULTRA-LOW SULFUR DIESEL
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COMPARISON OF SOOT EVOLUTION USING HIGH-SPEED CMOS COLOR CAMERA AND TWO-COLOR THERMOMETRY IN AN OPTICAL DIESEL ENGINE FUELED WITH B20 BIODIESEL BLEND AND ULTRA-LOW SULFUR DIESEL

机译：用B20生物柴油混合物和超低硫柴油燃料中使用高速CMOS彩色相机和双色温度测量使用高速CMOS彩色相机和双色温度的比较

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Biodiesel is a desirable alternative fuel for the diesel engine due to its low engine-out soot emission tendency. When blended with petroleum-based diesel fuels, soot emissions generally decrease in proportion to the volume fraction of biodiesel in the mixture. While comparisons of engine-out soot measurements between biodiesel blends and petroleum-based diesel have been widely reported, in-cylinder soot evolution has not been experimentally explored to the same extent. To elucidate the soot emission reduction mechanism of biodiesel, a single-cylinder optically-accessible diesel engine was used to compare the in-cylinder soot evolution when fueled with ultra-low sulfur diesel (ULSD) to that using a B20 biodiesel blend (20% vol/vol biodiesel ASTM D6751-03A). Soot temperature and KL factors are simultaneously determined using a novel two-color optical thermometry technique implemented with a high-speed CMOS color camera having wide-band Bayer filters. The crank-angle resolved data allows quantitative comparison of the rate of in-cylinder soot formation. High-speed spray images show that B20 has more splashing during spray wall impingement than ULSD, distributing rebounding fuel droplets over a thicker annular ring interior to the piston bowl periphery. The subsequent soot luminescence is observed by high-speed combustion imaging and soot temperature and KL factor measurements. B20 forms soot both at low KL magnitudes over large areas between fuel jets, and at high values among remnants of the fuel spray, along its axis and away from the bowl edge. In contrast, ULSD soot luminescence is observed exclusively as pool burning on the piston bowl surfaces resulting from fuel wall impingement. The soot KL factor evolution during B20 combustion indicates earlier and significantly greater soot formation than with ULSD. B20 combustion is also observed to have a greater soot oxidation rate which results in lower engine-out soot emissions. Measured soot temperatures near 1875K were similar for the two fuels for the duration of combustion. For both fuels, higher fuel injection pressure led to lower late-cycle soot KL levels. The trends of soot natural luminosity correlated well with the trends of soot KL factor, suggesting that relatively simple measurements of combustion luminosity may provide somewhat quantitative information about in-cylinder soot formation and oxidation. The apparent rate of heat release (ARHR) analysis under steady skip-fire conditions indicates that B20 combustion is less sensitive to wall temperature than that observed with ULSD due to a lesser degree of pool burning. B20 was found to have both a shorter ignition delay and shorter combustion duration than ULSD.
机译：由于其低发动机烟灰排放趋势，生物柴油是柴油发动机的理想替代燃料。与基于石油的柴油燃料混合时，烟灰排放通常与混合物中生物柴油的体积分数成比例地减小。虽然广泛报道了生物柴油和基于石油基柴油之间的发动机烟灰测量的比较，但缸内烟灰进化并未在同一程度上进行实验探索。为了阐明生物柴油的烟灰减排机构，使用单缸光学可接近的柴油发动机在用B20生物柴油混合物（20％）（20％）（20％）（20％）时将缸内烟气进化进行比较。使用超低硫柴油（ULSD） VOL / VOL BIODIASEL ASTM D6751-03A）。使用具有具有宽带拜耳滤波器的高速CMOS彩色摄像机实现的新型双色光学热体技术同时确定烟灰温度和KL因子。曲柄角分辨数据允许定量比较圆柱烟灰形成的速率。高速喷出图像表明，B20具有喷雾碰壁比ULSD期间更飞溅，分布在较厚的环形环内的活塞碗周反弹燃料液滴。通过高速燃烧成像和烟灰温度和KL因子测量观察随后的烟尘。 B20在燃料喷射器之间的大面积上的低k1幅度和燃料喷射的残余物的高值下形成烟灰，沿其轴线和远离碗边缘。相反，仅在燃料墙冲击导致的活塞碗表面上燃烧的池燃烧的池中的池中观察到ULSD烟灰发光。 B20燃烧期间的烟灰KL因子蒸馏表明比ULSD更早，烟灰形成明显更大。 B20燃烧也观察到具有更大的烟灰氧化速率，从而导致发动机脱气的烟灰排放较低。在燃烧持续时间的两种燃料附近测量的烟灰温度与两个燃料相似。对于两个燃料，较高的燃料喷射压力导致较低的后循环烟灰KL水平。烟灰天然亮度的趋势与烟灰KL因子的趋势相关，暗示燃烧发光度的相对简单测量可以提供关于缸内烟灰形成和氧化的稍微定量信息。稳定跳过条件下的热释放（ARHR）分析的表观速率表明，由于池燃烧程度较小，B20燃烧对壁温敏感而不是通过ULSD观察到的燃烧。发现B20具有比ULSD更短的点火延迟和较短的燃烧持续时间。

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