研究温湿度变化对车用燃料电池输出性能(输出电压和功率)的影响可为高精度进气控制策略提供有效的依据。本工作提出了一个温湿度-电流(temperature and relative humidity-current,TRH-C)模型,该模型考虑了电池内部电化学反应、电渗迁...研究温湿度变化对车用燃料电池输出性能(输出电压和功率)的影响可为高精度进气控制策略提供有效的依据。本工作提出了一个温湿度-电流(temperature and relative humidity-current,TRH-C)模型,该模型考虑了电池内部电化学反应、电渗迁移和加湿冷凝三部分水来源,揭示了电流随温湿度变化规律和由水活度表征的电渗迁移系数计算式。根据电池流道实物在计算软件COMSOL中建立网格,将TRH-C模型导入并应用有限体积法进行计算;搭建了燃料电池测试系统,在工作温度60℃和70℃、相对湿度分别为50%和100%条件下进行了实验并进行数据处理;并对通过TRH-C模型得到的极化曲线与实验数据进行比较,分析了电流密度和膜水含量分布云图。结果表明,TRH-C模型能预测燃料电池的性能,在工作温度为60℃、相对湿度为50%时,电压和功率密度的相对误差最大(电流密度为0.018 A/cm^(2)),分别为3.674%和3.696%。工作温度升高会导致膜水含量降低,但相对湿度增大会导致膜水含量升高。展开更多
Diesel fuel has been known as the most effective fuel but it is known as a fuel which produces harmful emissions. Later, emulsified diesel fuel was introduced as a better solution but there is no sufficient research d...Diesel fuel has been known as the most effective fuel but it is known as a fuel which produces harmful emissions. Later, emulsified diesel fuel was introduced as a better solution but there is no sufficient research data concerning combustion of emulsified fuel. The present work carried out a simulation of non-surfactant emulsified diesel fuel where composition of water in emulsion varied from 0% to 20% to determine the ratio of water to diesel which is more effective in reducing the exhaust emissions especially NOx. For this simulation,5% of water in diesel without surfactant was able to reduce NOx?up to 35%. It was shown that as the percentage of water increases, the power from that fuel combustion reduces.展开更多
文摘研究温湿度变化对车用燃料电池输出性能(输出电压和功率)的影响可为高精度进气控制策略提供有效的依据。本工作提出了一个温湿度-电流(temperature and relative humidity-current,TRH-C)模型,该模型考虑了电池内部电化学反应、电渗迁移和加湿冷凝三部分水来源,揭示了电流随温湿度变化规律和由水活度表征的电渗迁移系数计算式。根据电池流道实物在计算软件COMSOL中建立网格,将TRH-C模型导入并应用有限体积法进行计算;搭建了燃料电池测试系统,在工作温度60℃和70℃、相对湿度分别为50%和100%条件下进行了实验并进行数据处理;并对通过TRH-C模型得到的极化曲线与实验数据进行比较,分析了电流密度和膜水含量分布云图。结果表明,TRH-C模型能预测燃料电池的性能,在工作温度为60℃、相对湿度为50%时,电压和功率密度的相对误差最大(电流密度为0.018 A/cm^(2)),分别为3.674%和3.696%。工作温度升高会导致膜水含量降低,但相对湿度增大会导致膜水含量升高。
文摘Diesel fuel has been known as the most effective fuel but it is known as a fuel which produces harmful emissions. Later, emulsified diesel fuel was introduced as a better solution but there is no sufficient research data concerning combustion of emulsified fuel. The present work carried out a simulation of non-surfactant emulsified diesel fuel where composition of water in emulsion varied from 0% to 20% to determine the ratio of water to diesel which is more effective in reducing the exhaust emissions especially NOx. For this simulation,5% of water in diesel without surfactant was able to reduce NOx?up to 35%. It was shown that as the percentage of water increases, the power from that fuel combustion reduces.
