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A Chemical Kinetics Perspective on the High-Temperature Oxidation of Methane and Propane through Experiments and Kinetic Analysis
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作者 Ma Shoutao Yang Zhe +4 位作者 Zhu Yunfeng Sun Bing Jiang Jie Xu Wei Meng Ruiji 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS 2022年第4期1-11,共11页
In the conversion of methane and propane under high temperature and pressure,the ignition delay time(IDT)is a key parameter to consider for designing an inherently safe process.In this study,the IDT characteristics of... In the conversion of methane and propane under high temperature and pressure,the ignition delay time(IDT)is a key parameter to consider for designing an inherently safe process.In this study,the IDT characteristics of methane and propane(700–1000 K,10–20 bar)were studied experimentally and using kinetic modeling tools at stoichiometric fuel-tooxygen ratios.All the experiments were conducted through insentropic compression.The reliable experimental data were obtained by using the adiabatic core hypothesis,which can be used to generate and validate the detailed chemical kinetics model.The IDTs of methane and propane were recorded by a rapid compression machine(RCM)and compared to the predicted values obtained by the NUIGMech 3.0 mechanism.To test the applicability of NUIGMech 3.0 under different reaction conditions,the influence of temperature in the range of 700–1000 K(and the influence of pressure in the range of 10–20 bar)on the IDT was studied.The results showed that NUIGMech 3.0 could reasonably reproduce the experimentally determined IDT under the wide range of conditions studied.The constant volume chemical kinetics model was used to reveal the effect of temperature on the elementary reaction,and the negative temperature coefficient(NTC)behavior of propane was also observed at 20 bar.The experimental data can serve as a reference for the correction and application of kinetic data,as well as provide a theoretical basis for the safe conversion of low-carbon hydrocarbon chemicals. 展开更多
关键词 ignition delay time NUIGMech 3.0 negative temperature coefficient kinetic analysis
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非晶态TeO2/36°Y-X LiTaO3 SAW基板
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作者 商晓莉 公勋 +1 位作者 熊军 章德 《压电与声光》 CSCD 北大核心 2009年第1期4-5,8,共3页
研究了非晶态TeO2/36°Y-X LiTaO3层状结构的延迟温度系数(TCD),并计算了该结构中声表面波(SAW)的其他重要特性,如声波模式和机电耦合系数(k2)。非晶态TeO2薄膜作为一种新型具有负温度系数的材料,当将其沉积于具有正温度系数的36... 研究了非晶态TeO2/36°Y-X LiTaO3层状结构的延迟温度系数(TCD),并计算了该结构中声表面波(SAW)的其他重要特性,如声波模式和机电耦合系数(k2)。非晶态TeO2薄膜作为一种新型具有负温度系数的材料,当将其沉积于具有正温度系数的36°Y-X LiTaO3上时,在膜厚仅为传统SiO2薄膜的1/3情况下就可实现零延迟温度系数。另外,该结构中被利用的1阶Love波模式很纯,没有和其他模式明显的耦合,而且其k2高达8.61%。故此结构是一种具有广泛应用前景的新型复合SAW应用材料。 展开更多
关键词 延迟温度系数(tcd) 非晶态TeO2薄膜 36°Y-X LITAO3 LOVE波 层状结构 声表面波(SAW)
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AIN/128°Y-X LiNbO_3层结构的声表面波特性研究
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作者 陈岗 《湖南师范大学自然科学学报》 CAS 1991年第3期227-231,共5页
本文对A1N/128°Y-X LiNbO_3层结构的声表面波特性进行了研究。得到此层结构在较小的A1N膜厚时,不但具有延时温度系数(TCD)为零的特性;而且,在零TCD时,有高的机电耦合系数(k)及良好的频响特性。
关键词 层结构 声表面波 延时温度系数
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