A theoretical investigation of the effects of temperature, pressure, and equivalence ratio on the oxidation and reformed products of PRF90 under the flexible cylinder engine mode

A theoretical investigation of the effects of temperature, pressure, and equivalence ratio on the oxidation and reformed products of PRF90 under the flexible cylinder engine mode
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柔性缸发动机模式下温度、压力和当量比对PRF90氧化和重整产物影响的理论研究

DOI:
10.1016/j.applthermaleng.2018.03.083
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发表时间:
2018-06
影响因子:
6.4
通讯作者:
Mingfa Yao
Mingfa Yao
中科院分区:
工程技术2区
文献类型:
--
作者:
Yang Wang;Hu Wang;Mingfa Yao

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在这项研究中,柔性气缸发动机(FCE)的概念,即燃料在柔性气缸中的重组和改道到正常的气缸进行了验证与燃料的PRF 90。FCE模式由三个过程组成:重整、冷却和工作。利用CHEMKIN软件包从理论上研究了柔性圆筒操作条件对重整过程的影响。结果表明,随着初始工况的改变,柔性缸内形成了较大的低温反应区。在当量比为1.0-2.0的范围内,燃料重整的最佳区域是合适的.为了定量评价重整产物的反应活性,定义了反应活性系数指数。结果表明,添加重整产物可以缩短新鲜燃料的着火延迟时间。在P = 1 bar,λ = 1.8,T = 353 K和P = 1 bar,λ = 1.0,T = 303 K的初始工况下,柔性圆筒PRF 90的改性产物对新鲜燃料滞燃期的缩短作用最强,最弱。研究结果对实现可控高效清洁燃烧具有重要的参考价值.
In this study, the concept of flexible cylinder engine (FCE) by which a fuel is reformed in a flexible cylinder and rerouted into the normal cylinders was verified with the fuel of PRF90. The FCE mode consists of three processes: reforming, cooling, and working. The effect of operation conditions of flexible cylinder on the reforming process was investigated theoretically with CHEMKIN package. It shows that a large low-temperature reaction region in the flexible cylinder is formed with a change of initial operation conditions. An optimal fuel reforming region was found which is applicable at equivalence ratio of 1.0–2.0. In order to quantitatively assess the reactivity of reformed products, a reactivity coefficient index was defined. It is observed that addition of reformed products could reduce the ignition delay time of the fresh fuel. The reformed products of PRF90 from the flexible cylinder under the initial operation conditions of P = 1 bar, ϕ = 1.8, T = 353 K and P = 1 bar, ϕ = 1.0, T = 303 K have the strongest and weakest effect on reducing the ignition delay time of the fresh fuel, respectively. The current study could be helpful valuable to achieve controllable high efficiency and clean combustion.
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