Flameless combustion is a new technology with the following advantages:1)Ultra-low emissions of both NOX and CO;2)fuel flexibility,from liquid fuels,natural gas to hydrogen-rich syngas;3)lower possibility of flashback...Flameless combustion is a new technology with the following advantages:1)Ultra-low emissions of both NOX and CO;2)fuel flexibility,from liquid fuels,natural gas to hydrogen-rich syngas;3)lower possibility of flashback and thermoacoustic oscillations.In this paper,we focus on the dynamic characteristics of a flameless model combustor.Experimental results show that flameless combustion can lower emissions while maintaining combustion stability.However,combining a pilot flame with flameless combustion may excite thermoacoustic instability.展开更多
大尺寸汽轮机动压轴承与传统汽轮机以及其他常用的更小尺寸动压轴承相比,其尺寸更大、比压更高,并不完全符合经典润滑理论的层流假设,在估算其特性参数时需要进行进一步的研究。采用有限体积法,考虑滑油温黏效应和油膜空化效应,对某典...大尺寸汽轮机动压轴承与传统汽轮机以及其他常用的更小尺寸动压轴承相比,其尺寸更大、比压更高,并不完全符合经典润滑理论的层流假设,在估算其特性参数时需要进行进一步的研究。采用有限体积法,考虑滑油温黏效应和油膜空化效应,对某典型核电动压轴承在不同转速下的静态特性进行数值分析;对比层流和紊流模型以及不同空化模型得到的数值分析结果,并与文献数据进行比较。结果表明:Realizable k-Epsilon紊流模型结合Singhal et al.空化模型适用于该型动压轴承的模拟。在此基础上获得了大尺寸汽轮机动压轴承在不同转速下的油膜厚度规律、压力分布、温度分布、润滑油流量等静态特性规律以及轴承刚度阻尼动态特性数据。展开更多
基金supported by the National Natural Science Foundation of China(Grant No.50706054)
文摘Flameless combustion is a new technology with the following advantages:1)Ultra-low emissions of both NOX and CO;2)fuel flexibility,from liquid fuels,natural gas to hydrogen-rich syngas;3)lower possibility of flashback and thermoacoustic oscillations.In this paper,we focus on the dynamic characteristics of a flameless model combustor.Experimental results show that flameless combustion can lower emissions while maintaining combustion stability.However,combining a pilot flame with flameless combustion may excite thermoacoustic instability.
文摘大尺寸汽轮机动压轴承与传统汽轮机以及其他常用的更小尺寸动压轴承相比,其尺寸更大、比压更高,并不完全符合经典润滑理论的层流假设,在估算其特性参数时需要进行进一步的研究。采用有限体积法,考虑滑油温黏效应和油膜空化效应,对某典型核电动压轴承在不同转速下的静态特性进行数值分析;对比层流和紊流模型以及不同空化模型得到的数值分析结果,并与文献数据进行比较。结果表明:Realizable k-Epsilon紊流模型结合Singhal et al.空化模型适用于该型动压轴承的模拟。在此基础上获得了大尺寸汽轮机动压轴承在不同转速下的油膜厚度规律、压力分布、温度分布、润滑油流量等静态特性规律以及轴承刚度阻尼动态特性数据。
