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| 1 | 船用中速柴油机的进气门早关米勒循环显示文摘In this study,a one-dimensional simulation was performed to evaluate the performance of in-cylinder combustion to control NO_(x) emissions on a four-stroke,six-cylinder marine medium-speed diesel engine.Reducing the combustion temperature is an important in-cylinder measure to decrease NO_(x) emissions of marine diesel engines.The Miller cycle is an effective method used to reduce the maximum combustion temperature in a cylinder and accordingly decrease NO_(x) emissions.Therefore,the authors of this study designed seven different early intake valve closing(EIVC)Miller cycles for the original engine,and analyzed the cycle effects on combustions and emissions in high-load conditions.The results indicate that the temperature in the cylinder was significantly reduced,whereas fuel consumption was almost unchanged.When the IVC was properly advanced,the ignition delay period increased and the premixed combustion accelerated,but the in-cylinder average pressure,temperature and NO_(x) emissions in the cylinder were lower than the original engine.However,closing the intake valve too early led to high fuel consumption.In addition,the NO_(x) emissions,in-cylinder temperature,and heat release rate remarkably increased.Therefore,the optimal timing of the EIVC varied with different loads.The higher the load was,the earlier the best advance angle appeared.Therefore,the Miller cycle is an effective method for in-engine NO_(x) purification and does not entail significant cost. | 魏胜利 吴成成 严书哲 丁统元 陈洁 | 2022 | Journal of Marine Science and Application2022，21，1： | 1 |
| 2 | 充量温度对某中速柴油机燃烧和NO_x排放的影响显示文摘为了研究米勒循环条件下充量温度的变化对某中速柴油机燃烧和NOx排放的影响,采用三维计算流体动力学模拟方法对其缸内流动、喷雾、燃烧和NOx生成过程进行了数值模拟分析。结果表明:随着充量温度的降低,着火滞燃期、预混合燃烧放热率峰值和最高压力升高率不断增加,在充量初始温度比原机降低40 K之后尤为显著;指示油耗率和NOx排放率先降低后升高,说明过低的充量温度不利于降低NOx排放,其原因是滞燃期太长,预混合燃烧放热太多,促进了热NOx生成。 | 冷先银 魏胜利 田江平 何爽 隆武强 郭海娥 张旭东 钟兵 李焕英 | 2014 | 哈尔滨工程大学学报2014，35，11： | 1 |
| 3 | 电控单体泵喷油压力升高率预测模型显示文摘针对电控单体泵系统喷油压力升高率与其影响因素间的响应关系,制定了喷油压力升高率特性的实验研究方案。运用偏最小二乘法进行多元回归分析,得出凸轮型线速率、柱塞直径、高压油管长度、高压油管直径、弹簧预紧力和喷孔流量系数与喷油压力升高率的多元二次预测模型。对比结果表明:喷油压力上升阶段和下降阶段的平均压力升高率计算值与预测模型预测结果最大偏差分别为1.76%和4.69%,最大压力升高率和最小压力升高率计算值与预测模型预测结果最大偏差分别为8.41%和2.55%。 | 白云 范立云 马修真 刘鹏 李清 | 2015 | 哈尔滨工程大学学报2015，36，7： | 0 |
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