Control of Volumetric Ignition and Thermal-Chemical Instability in Weakly Ionized Plasma for High Pressure Ultra-lean Combustion

高压超稀薄燃烧弱电离等离子体体积点火和热化学不稳定性的控制

• 批准号: 1903362
• 负责人: Yiguang Ju
• 金额: $ 36万
• 依托单位: Princeton University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-09-01 至 2023-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1903362&HistoricalAwards=false
• 关键词: Control; Volumetric; Ignition; Thermal; Chemical

Advanced fuel-lean combustion engine technologies can increase the energy efficiency and reduce the carbon emissions. However, the development of this technology is hindered by the ignition failure in fuel-lean mixtures. To achieve successful ignition in fuel-lean mixtures, understanding of the mechanism of plasma reaction and propagation in engines is critical. However, the coupling between fuel chemistry and plasma-associated reactions in a combustible mixture has not been studied in detail. In this investigation, a collaborative team will develop new theoretical, computational, and experimental models to understand the fundamental mechanism of thermal-chemical processes occurring in combustible mixtures. If successful, the proposed investigation will provide a new well-validated theoretical model to simulate plasma-driven reactions in an engine, especially under ultra-lean fueling conditions with reduced carbon and pollutant emissions. The plasma model developed can also contribute to advancing other research topics, such as fuel reforming and materials synthesis. The research will also provide career development opportunity for graduate and undergraduate students in plasma sciences, combustion, sustainable energy, and laser imaging, and augment the Sustainable Energy certificate program for Princeton undergraduate studentsThe proposed study will develop: (1) a new thermal-chemical instability model to understand the mechanism of kinetic coupling between plasma and n-pentane combustion chemistry in plasma contraction, (2) advanced laser diagnostic methods to characterize the dynamics and chemical process of plasma instability in a combustible mixture at elevated pressure, (3) a validated three-dimensional computational model to simulate thermal-chemical instability of weakly ionized plasma in a combustion mixture, and (4) a novel volumetric ignition technique by controlling plasma instability using an energy cascading discharge array for ultra-lean ignition. The resulting new thermal-chemical instability model will significantly advance the understanding of the kinetic impact of plasma-combustion chemistry on plasma instability in engines. The experimental data of electron temperature, number density, and electric field will provide critical validation targets for the theory and numerical models. The novel volumetric ignition technique by using an instability controlled energy cascading discharge array will provide an innovative method for efficient ignition at fuel lean conditions.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

先进的贫燃发动机技术可以提高能源效率，减少碳排放。然而，稀燃混合气中的点火失败问题阻碍了该技术的发展。为了在贫燃料混合物中成功点火，了解发动机中等离子体反应和传播的机理至关重要。然而，在可燃混合物中燃料化学和等离子体相关反应之间的耦合尚未被详细研究。在这项研究中，一个合作团队将开发新的理论，计算和实验模型，以了解可燃混合物中发生的热化学过程的基本机制。如果成功，拟议的研究将提供一个新的经过充分验证的理论模型来模拟发动机中的等离子体驱动反应，特别是在碳和污染物排放减少的超贫燃料条件下。开发的等离子体模型也有助于推进其他研究课题，如燃料重整和材料合成。该研究还将为等离子体科学，燃烧，可持续能源和激光成像的研究生和本科生提供职业发展机会，并增加普林斯顿大学本科生的可持续能源证书课程。（1）新的热化学不稳定性模型，以理解等离子体收缩中等离子体和正戊烷燃烧化学之间的动力学耦合机制，（2）先进的激光诊断方法来表征在升高的压力下可燃混合物中的等离子体不稳定性的动力学和化学过程，（3）经验证的三维计算模型来模拟燃烧混合物中的弱电离等离子体的热化学不稳定性，以及（4）通过使用用于超贫点火的能量级联放电阵列来控制等离子体不稳定性的新颖的体积点火技术。由此产生的新的热化学不稳定性模型将显着推进等离子体燃烧化学对发动机等离子体不稳定性的动力学影响的理解。电子温度、数密度和电场的实验数据将为理论和数值模型提供关键的验证目标。通过使用不稳定性控制的能量级联放电阵列的新颖的体积点火技术将提供一种在贫燃料条件下有效点火的创新方法。该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

Kinetic studies of excited singlet oxygen atom O( 1 D) reactions with ethanol

激发态单线态氧原子O(1D)与乙醇反应的动力学研究

• DOI: 10.1002/kin.21474
• 发表时间: 2021
• 期刊: International Journal of Chemical Kinetics
• 影响因子: 1.5
• 作者: Zhong, Hongtao;Yan, Chao;Teng, Chu C.;Chen, Timothy Y.;Wysocki, Gerard;Ju, Yiguang
• 通讯作者: Ju, Yiguang

Studies of multi-channel spark ignition of lean n-pentane/air mixtures in a spherical chamber

• DOI: 10.1016/j.combustflame.2019.11.022
• 发表时间: 2020-01
• 期刊: Combustion and Flame
• 影响因子: 4.4
• 作者: Hao Zhao;Ningbo Zhao;Tianhan Zhang;Shuqun Wu;Guoming Ma;Chao Yan;Y. Ju

Plasma-assisted deflagration to detonation transition in a microchannel with fast-frame imaging and hybrid fs/ps coherent anti-Stokes Raman scattering measurements

• DOI: 10.1016/j.proci.2022.08.133
• 发表时间: 2023-01
• 期刊: Proceedings of the Combustion Institute
• 影响因子: 3.4
• 作者: Madeline Vorenkamp;S. Steinmetz;Timothy Y. Chen;Xingqian Mao;A. Starikovskiy;C. Kliewer;Y. Ju

Effect of Plasma-Enhanced Low-Temperature Chemistry on Deflagration-to-Detonation Transition in a Microchannel

• DOI: 10.2514/1.j062966
• 发表时间: 2023-08
• 期刊: AIAA Journal
• 影响因子: 2.5
• 作者: Madeline Vorenkamp;S. Steinmetz;Xingqian Mao;Zhiyu Shi;A. Starikovskiy;Y. Ju;C. Kliewer

Effects of inter-pulse coupling on nanosecond pulsed high frequency discharge ignition in a flowing mixture

• DOI: 10.1016/j.proci.2022.06.018
• 发表时间: 2022-07
• 期刊: Proceedings of the Combustion Institute
• 影响因子: 3.4
• 作者: Xingqian Mao;Hongtao Zhong;Ziyu Wang;T. Ombrello;Y. Ju