Numerical investigation and cause-and-effect analysis of cyclic fluctuations and their effect on auto-ignition in hydrogen combustion
氢气燃烧循环波动及其对自燃影响的数值研究和因果分析
基本信息
- 批准号:423158633
- 负责人:
- 金额:--
- 依托单位:
- 依托单位国家:德国
- 项目类别:Research Units
- 财政年份:
- 资助国家:德国
- 起止时间:
- 项目状态:未结题
- 来源:
- 关键词:
项目摘要
In funding period 1, scale-resolved simulations (LES) were used to investigate the influence of cyclic fluctuations on the development of knocking combustion for hydrocarbon-based fuels. It was shown that the complex kinetics of ignition of multicomponent fuels must be taken into account for modeling turbulent auto-ignition. In particular, the strongly nonlinear dependence of the ignition delay time on temperature in the Negative Temperature Coefficient (NTC) regime has a direct impact on auto-ignition under engine conditions. The two-stage auto-ignition that is characteristic of the NTC regime could be modeled using a more advanced auto-ignition model. After validation using data from a direct numerical simulation (DNS) from TP 2, the implementation for the engine LES was carried out. Using a multi-cycle LES, it was shown that there is a strong interaction between the auto-ignition chemistry in the NTC regime and the cyclic combustion fluctuations that affect local auto-ignition processes. Rapid combustion with large pressure rise rates and strong compression of the end gas resulted in earlier knock onset. LES further showed a strong correlation between auto-igniting mass and experimentally observed knock amplitudes. In the second funding period, the occurrence of abnormal combustion phenomena in hydrogen-fueled engines will be investigated. Both knocking and pre-ignition can be attributed to auto-ignition in turbulent flows and at hot surfaces. Under engine conditions, hydrogen exhibits very complex ignition behavior, which is influenced not only by kinetics but also by strong differential diffusion effects. In the few studies on hydrogen engines, mainly global variables have been investigated so far; in this project, the focus is on the analysis of the local ignition processes under engine conditions. A better understanding of the local interaction of transport, hydrogen chemistry and, in the case of surface ignition, the wall will be achieved. The models of funding period 1 will be extended for hydrogen ignition, and validation will initially be performed on generic flames and DNS data from TP 2. The engine application will be investigated in close cooperation with TP 6. Ignition will be considered first in a high-pressure chamber with temperature-controlled surfaces, then in the hydrogen engine. In a cause-and-effect chain analysis, the interaction of local auto-ignition with cyclic variations of the flow, the residual gas fraction and the combustion will be investigated.
在第一个资助期内,尺度分解模拟(LES)被用来研究循环波动对碳氢燃料爆震燃烧发展的影响。 结果表明,湍流自燃模型必须考虑多组分燃料着火的复杂动力学。特别地,在负温度系数(NTC)状态下点火延迟时间对温度的强非线性依赖性对发动机条件下的自燃具有直接影响。两阶段自燃是NTC制度的特点,可以使用更先进的自燃模型建模。在使用TP 2的直接数值模拟(DNS)数据进行验证后,进行了发动机LES的实施。使用多循环LES,它表明,有一个强烈的相互作用的自燃化学NTC制度和循环燃烧波动,影响局部自燃过程。快速燃烧与大的压力上升率和强大的压缩的最终气体导致较早的爆震开始。LES进一步显示了自燃质量和实验观察到的爆震幅度之间的强相关性。在第二个资助期内,将调查氢燃料发动机中异常燃烧现象的发生情况。爆震和提前点火都可以归因于湍流和热表面处的自燃。在发动机条件下,氢表现出非常复杂的点火行为,这不仅受到动力学的影响,而且还受到强烈的微分扩散效应的影响。在对氢发动机的少数研究中,迄今为止主要研究了全局变量;在本项目中,重点是分析发动机条件下的局部点火过程。将更好地了解运输、氢化学以及(在表面点火的情况下)壁的局部相互作用。资助期1的模型将扩展到氢气点火,最初将对TP 2的通用火焰和DNS数据进行验证。发动机的应用将与TP 6密切合作进行研究.点火将首先考虑在具有温度控制表面的高压室中,然后在氢发动机中。在因果链分析中,将研究局部自燃与流量、残余气体分数和燃烧的循环变化的相互作用。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Professor Dr. Christian Hasse其他文献
Professor Dr. Christian Hasse的其他文献
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{{ truncateString('Professor Dr. Christian Hasse', 18)}}的其他基金
Forced ignition in turbulent mixtures of sufficiently large Lewis numbers
刘易斯数足够大的湍流混合物中的强制点火
- 批准号:
411275182 - 财政年份:2019
- 资助金额:
-- - 项目类别:
Research Grants
Multi-Dimensional Flamelet Modelling for the LES of Pulverised Coal Flames
粉煤火焰 LES 的多维小火焰模型
- 批准号:
238057103 - 财政年份:2013
- 资助金额:
-- - 项目类别:
Research Grants
Curvature effects in laminar and turbulent non-premixed combustion
层流和湍流非预混燃烧中的曲率效应
- 批准号:
310695286 - 财政年份:
- 资助金额:
-- - 项目类别:
Research Grants
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