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Effect of Hydrogen Addition on Methane HCCI Engine Ignition Timing and Emissions Using a multi-zone model

Chinese Journal of Chemical Physics 2009年第3期22卷 290-296,340页

作者：汪子涵汪春梅唐华欣左承基徐宏明合肥工业大学机械与汽车工程学院合肥230009 伯明翰大学伯明翰214063

Ignition timing control is of great importance in homogeneous charge compression ignition engines. The effect of hydrogen addition on methane combustion was investigated using a CHEMKIN multi-zone model. Results show that hydrogen addition advances ignition tim- ing and enhances peak pressure and temperature. A brief analysis of chemical kinetics of methane blending hydrogen is also performed in order to investigate the scope of its appli- cation, and the analysis suggests that OH radical plays an important role in the oxidation. Hydrogen addition increases NOx while decreasing HC and CO emissions. Exhaust gas recir- culation （EGR） also advances ignition timing; however, its effects on emissions are generally the opposite. By adjusting the hydrogen addition and EGR rate, the ignition timing can be regulated with a low emission level. Investigation into zones suggests that NOx is mostly formed in core zones while HC and CO mostly originate in the crevice and the quench layer.

关键词： Homogeneous charge compression ignition multi-zone model Methane Hy- drogen Ignition timing Emission

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Structural behaviors of steel roof truss exposed to pool fire

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Journal of Central South University 2012年第7期19卷 2054-2060页

作者：陈长坤张威 Institute of Disaster Prevention Science and Safety Technology Central South University State Key Laboratory of Fire Science(University of Science and Technology of China)

Experimental research was conducted to study the structural behaviors of a steel roof truss model without fire-proof coating under pool fire conditions. The data of temperature distribution and displacements of typical members were obtained. It is found that the temperature distribution of environment inside the structure, which is found to be in accordance with the multi-zone model with height, has a decisive effect on the tempera^tre evolution of steel members. Besides, it can also be observed that due to the restriction and coordination among the truss members in the localized fire, the maximum relative deflection, which occurs at the mid-span of the top chord, is relatively slight and has not exceeded 1 mm under experimental conditions. On the other hand, the column experiences a notable thermal expansion during the test. Then, a finite element model is presented and validated by the test results.

关键词： steel roof truss fire test multi-zone model finite element analysis

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