An experimental study on emissions optimization using micro-genetic algorithms in a HSDI diesel engine；Common rail injection system design and strategies for low emissions diesel vehicles；2nd International Conferenc...An experimental study on emissions optimization using micro-genetic algorithms in a HSDI diesel engine；Common rail injection system design and strategies for low emissions diesel vehicles；2nd International Conference on Advanced Automotive Diesel Engine Technology；Common-rail HSDI diesel engine combustion and emissions with fossil/bio-derived fuel blends；Development of multi-layer, aluminum-tin-silicon alloy bearing for automotive diesel engine……展开更多
随着对发展问题研究的不断深入,人类发展指数(HDI)的缺陷已经凸显,研究重点逐渐转向重视人类自身的全面可持续发展。人类可持续发展指数(Human Sustainable Development Index,HSDI)在HDI的基础上,从社会、经济和环境三个维度全面评价...随着对发展问题研究的不断深入,人类发展指数(HDI)的缺陷已经凸显,研究重点逐渐转向重视人类自身的全面可持续发展。人类可持续发展指数(Human Sustainable Development Index,HSDI)在HDI的基础上,从社会、经济和环境三个维度全面评价人类自身发展的可持续水平。在核算2005—2014年全国主要省(市、自治区)HDI和HSDI指数的基础上,分析了近10年来HDI与HSDI指数的变化特征,结果发现:近10年来HDI与HSDI指数总体上呈现上升趋势,表明我国近10年来可持续发展总体势头良好,但省际间的差异仍然存在;高速发展的环境代价并未完全消除,通过比较2005、2010及2014年HDI与HSDI指数的排序变化情况,发现我国部分省份(如海南省)因较好的环境质量而获得了人类发展水平在全国排序的上升,山东、辽宁等省份则因人均碳排放较高而导致其人类发展水平在全国的排序下降。增加环境因素后排序的变动表明HSDI指数能够更加全面、真实地测度一个地区的可持续发展水平。展开更多
This paper investigates the effect of intake port configuration on the swirl that is generated within a direct injection(D.I.) diesel engine. The in-cylinder flow characteristics are known to have significant effects ...This paper investigates the effect of intake port configuration on the swirl that is generated within a direct injection(D.I.) diesel engine. The in-cylinder flow characteristics are known to have significant effects on fuel-air mixing, combustion, and emissions. To clarify how to intensify the swirl flow, a swirl control valve(SCV) and a bypass were selected as design parameters for enhancing the swirl flow. The optimal intake port shape was also chosen as a parameter needed to efficiently generate a high swirl ratio. The results revealed that a key factor in generating a high swirl ratio was to control the intake airflow direction passing through the intake valve seat. Further, the swirl intensity was influenced by changing the distance between the helical and tangential ports, and the swirl flow was changed by the presence of a bypass near the intake valve seat. Additionally, the effect of intake port geometry on the in-cylinder flow field was investigated by using a laser sheet visualization method. The experimental results showed a correlation of swirl ratio and mass flow rate. In addition, we found that employing the bypass was an effective method to increase swirl ratio without sacrificing mass flow rate.展开更多
文摘An experimental study on emissions optimization using micro-genetic algorithms in a HSDI diesel engine；Common rail injection system design and strategies for low emissions diesel vehicles；2nd International Conference on Advanced Automotive Diesel Engine Technology；Common-rail HSDI diesel engine combustion and emissions with fossil/bio-derived fuel blends；Development of multi-layer, aluminum-tin-silicon alloy bearing for automotive diesel engine……
文摘随着对发展问题研究的不断深入,人类发展指数(HDI)的缺陷已经凸显,研究重点逐渐转向重视人类自身的全面可持续发展。人类可持续发展指数(Human Sustainable Development Index,HSDI)在HDI的基础上,从社会、经济和环境三个维度全面评价人类自身发展的可持续水平。在核算2005—2014年全国主要省(市、自治区)HDI和HSDI指数的基础上,分析了近10年来HDI与HSDI指数的变化特征,结果发现:近10年来HDI与HSDI指数总体上呈现上升趋势,表明我国近10年来可持续发展总体势头良好,但省际间的差异仍然存在;高速发展的环境代价并未完全消除,通过比较2005、2010及2014年HDI与HSDI指数的排序变化情况,发现我国部分省份(如海南省)因较好的环境质量而获得了人类发展水平在全国排序的上升,山东、辽宁等省份则因人均碳排放较高而导致其人类发展水平在全国的排序下降。增加环境因素后排序的变动表明HSDI指数能够更加全面、真实地测度一个地区的可持续发展水平。
基金supported by the research fund of Hanyang University(HY-2012-P)
文摘This paper investigates the effect of intake port configuration on the swirl that is generated within a direct injection(D.I.) diesel engine. The in-cylinder flow characteristics are known to have significant effects on fuel-air mixing, combustion, and emissions. To clarify how to intensify the swirl flow, a swirl control valve(SCV) and a bypass were selected as design parameters for enhancing the swirl flow. The optimal intake port shape was also chosen as a parameter needed to efficiently generate a high swirl ratio. The results revealed that a key factor in generating a high swirl ratio was to control the intake airflow direction passing through the intake valve seat. Further, the swirl intensity was influenced by changing the distance between the helical and tangential ports, and the swirl flow was changed by the presence of a bypass near the intake valve seat. Additionally, the effect of intake port geometry on the in-cylinder flow field was investigated by using a laser sheet visualization method. The experimental results showed a correlation of swirl ratio and mass flow rate. In addition, we found that employing the bypass was an effective method to increase swirl ratio without sacrificing mass flow rate.
