【摘 要】
:
The effect of high hydrogen fuel on turbulent combustion in advanced gas turbine combustor with our newly designed arrayed-vanes premixer was studied by large eddy simulation(LES).The dynamic Smagorinsky model is used to calculate the subgrid stress.Finit
【机 构】
:
Beijing Branch of Huadian Electric Power Research Institute Co.,Ltd,Beijing 100071,China;School of A
论文部分内容阅读
The effect of high hydrogen fuel on turbulent combustion in advanced gas turbine combustor with our newly designed arrayed-vanes premixer was studied by large eddy simulation(LES).The dynamic Smagorinsky model is used to calculate the subgrid stress.Finite-rate chemistry is included using a four steps mechanisms.A thickened flame model was used to deal with the reaction rate.The transport and thermal properties are obtained by CHEMKIN packages.The results show that with the increase of hydrogen content,the wake recirculation zone and central toroidal recirculation zone separate.The turbulent fluctuations of H2/air flame first decreases and then increases.For the response of turbulent flame,the results show that the flame brush is narrow and short with the increase of hydrogen content.When the hydrogen content is low,the syngas/air flame can also propagate in the high-speed flow.Therefore,for different flames,the position of outer propagating flame is almost the same.The results also show that the fluctuation of flame intensity increases with the increase of hydrogen content.Although the increase of hydrogen content shortens the chemical reaction time and suppresses the perturbation of turbulent eddies,the cellular instability may further enhance the fluctuation of flame intensity.
其他文献
In order to meet the increasingly stringent requirements for nitrogen oxides(NOx)emissions from gas boilers,flue gas recirculation(FGR)technology is commonly used to achieve ultra-low NOx emissions.However,under some ultra-low NOx combustion conditions wi
本文主要根据我国车路协同发展的阶段,提出了各阶段车路协同技术发展所出现的一些挑战和待解决的问题,并分析5G车路协同实现大规模落地应用的关键因素,总结可行的解决方案和未来可能的发展方向,为后续车路协同的大规模落地应用发展提供参考.
以利欧股份两次获得国资纾困帮扶为例,运用案例分析法,阐述了国有资本如何帮助高比例股权质押的上市公司化解平仓和暂时性流动性危机.研究结果表明,政府通过专项基金和国企受让民营企业大股东质押股份可以有效帮助企业纾困,具体表现在稳定股价、解决债务危机和降低质押比例上.政府在后续化解A股市场股权质押风险过程中,也应严格筛选纾困对象、采取灵活的政策,做到有进有退,并且要监督纾困资金的流向促进帮扶纾困工作取得良好效果.
Evacuated tube transportation is an important development direction for the high-speed transportation technology of the future.However,a train running at supersonic speed in a closed tube can create an unstable aerothermal phenomenon,causing the temperatu
2020年伊始,一场席卷全球的重大突发事件波及全国各行各业每个人的生活与工作,许多从业者因此改变了常规工作方式,许多企业也开启了远程办公、网络行政的尝试.文章旨在探讨重大突发事件中员工敬业度的变化,从资源守恒理论、社会交换论以及个人心理状况的员工敬业度理论基础出发,结合问卷调查,挖掘重大突发事件中员工敬业度变化的原因,以及重大突发事件对员工敬业度的影响.
Recent combustion research has focused on low temperature combustion to meet engine emission regulations and to advance the development of low temperature homogenous compression ignition engines.Autoignition studies in this temperature regime are primaril
The gas turbine is the main power equipment for naval ship and special civil ship,while the compressor is one of the core structures of the gas turbine.The existing tip clearance could prevent the compressor blade and casing collision.Therefore,the flow l
文章对“晋江经验”的传承发展现状进行调查,发现晋江民营企业发展能力仍需提高,人才无序流动、高端人才短缺、新型服务型政府要在深化“放管服”改革上下功夫等因素制约了“晋江经验”传承、创新和发展.因此,传承发展好“晋江经验”必须立足新时代新发展理念.提出以“六个始终坚持”和“正确处理好五个关系”为根本遵循;履行服务型政府职能,当好企业健康高速发展的引路人;秉持解放思想,敢拼、爱拼、善拼的改革精神;创新平台铸就新高地,建立现代企业制度;继续走全面发展,造福民生,共享幸福的康庄大道是新发展理念下传承发展“晋江经验”
随着我国经济的快速发展和国民收入的不断提高,消费者对绿色、优质、健康的农产品需求与日俱增.绿色消费和绿色营销已经成为农产品市场的主潮流,特别在新时期乡村振兴背景下,我国高度关注“三农问题”.文章分析了绿色营销和传统营销在绿色农产品营销策略上的不同,指出绿色农产品营销存在的问题,并探讨如何做好绿色农产品营销策略:积极挖掘各地特色资源,打造绿色农产品品牌化;做好目标化的市场定位,细分绿色农产品市场;大力发展绿色农产品电子商务,推广农产品精准营销模式;全面提升农业从业者综合素质,落实乡村振兴战略.
医疗工作是卫生健康事业的重要组成部分,承载着救死扶伤的重任,我国历来十分重视医疗卫生领域的建设,因此,医院需要提升档案信息资源的开发与利用.本文讨论了医院档案信息的开发与利用策略,运用先进的技术手段与理念,对医院所涉及的多种档案类型进行合理的开发与利用.