Fundamental and Applied Studies in Chemical Reacting Flows

化学反应流程的基础与应用研究

• 批准号: RGPIN-2018-03807
• 负责人: Kostiuk, Larry
• 金额: $ 9.32万
• 依托单位: University of Alberta
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=760211
• 关键词: Fundamental; Applied; Studies; Chemical; Reacting

In keeping with the objectives of a Discovery Grant, the proposed work is program-based. It contains fundamental and applied research, as well as broadly addressing two core motivations for studying chemical reacting flows. This research is aimed at advancing the understandings needed to control and manage: (A) the environmental impacts of the combustion of hydrocarbon resources; and, (B) the rates of conversion of chemical energy to thermal energy associated with combustion processes. Project A Decarbonization of Natural Gas for Heating Applications: The world is transitioning away from fossilize fuels that primarily store their energy in the form of carbon (e.g., coal and oil, and to a lesser degree natural gas), which introduces “new” carbon dioxide into the atmospheric when it is burned, to a system with net-zero carbon cycle. A process is being explored, specifically for heating applications, to see if the elements in the alkanes in natural gas can be economically partitioned through thermal decomposition in a zero-oxygen environment into black carbon and hydrogen. These components can then be easily separated based on their density, capturing the carbon as a solid while sending the hot hydrogen off for combustion where its products are needed at their typical temperatures. The net result is that twice as much natural gas is processed as originally burned for the heating application, but there are no carbon dioxide emissions. This project also involves the characterization of the captured black carbon to see if it has value for tires, rubber, paint, inks, or electrodes.Project B - Role of Unsteadiness in Modelling Premixed Turbulent Flames at High Damkohler Numbers: Our phenomenological understanding the interactions between unsteady flows and burning rates is not as well developed as for steady flames. Most practical flames are turbulent, so they are rife with unsteadiness. The objective of this study is to ensure that these unsteady effects are properly accounted for in modelling the burning rate of premixed flames. Of particular interest is the way that flames respond to flow features that have time scales of the same order as the flame chemistry. As those time scales approach each other the response of the flame's heat release are profoundly affected in terms of phase lag and amplitude. Depending on the equivalence ratio of the reactants this may occur at frequencies as low as 100 Hz. Consequently, non-direct numeric simulations (i.e., large eddy simulations and G-equation models) miss the time (and hence location) and amplitude of heat release. The approach we are taking is to develop flame transfer functions based on simple direct numeric simulations and make models available to those studying complex turbulent flows.Taken collectively, this research will contribute to more a responsible and environmentally sustainable use of hydrocarbon fuels.

为了符合发现赠款的目标，拟议的工作是基于程序的。它包含基本和应用研究，并广泛解决了研究化学反应流的两个核心动机。这项研究旨在提高控制和管理所需的理解：（a）碳氢化合物资源组合的环境影响； （b）化学能与组合过程相关的热能的转化速率。项目是用于加热应用的天然气的脱碳化：世界正在从化石燃料过渡，这些燃料以碳的形式（例如煤炭和石油，以及较小程度的天然气）将其能量存储在大气中，从而将“新的”二氧化碳引入大气中，并将其燃烧到大气中，并将其燃烧到网络中。正在探索一个过程，专门用于加热应用，以查看天然气中烷烃中的元素是否可以通过在零氧气环境中的热分解中经济分配到黑碳和氢中。然后，这些成分可以根据其密度轻松分离，在将热氢发送以在典型温度下需要其产物的情况下捕获碳作为固体。最终结果是，最初燃烧的天然气是供暖应用的两倍，但没有二氧化碳排放。该项目还涉及捕获的黑碳的表征，以查看其是否对轮胎，橡胶，油漆，油墨或电极具有价值。ProjectB-不稳定在建模高damkohler数字上的预混合湍流火焰中的作用：我们的现象学理解不稳定的流量和燃烧速率之间的相互作用以及稳定的火焰之间的相互作用。大多数实际的火焰都是动荡的，因此它们充满了不稳定。这项研究的目的是确保这些不稳定效应在建模预混合火焰的燃烧速率时正确考虑了这些效果。特别有趣的是，火焰对具有与火焰化学相同顺序的流动尺度响应的方式。随着这些时间尺度相互接近，火焰的热量释放的响应在相位滞后和放大器方面受到了深远的影响。取决于反应物的当量比，这可能以低至100 Hz的频率发生。因此，非直接数字模拟（即大型涡流模拟和G-方程模型）错过了热量释放的时间（因此位置）和放大器。我们采用的方法是基于简单的直接数字模拟来开发火焰传输功能，并使模型可用于研究复杂的湍流流动。