Combustion of ammonia under application-relevant conditions: a case study to improve thermal radiation models and reactivity prediction

应用相关条件下的氨燃烧：改进热辐射模型和反应性预测的案例研究

• 批准号: 469834263
• 负责人: Dr.-Ing. Joachim Beeckmann
• 金额: --
• 依托单位: Institut für Technische Verbrennung (ITV)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/469834263?language=en
• 关键词: Combustion; ammonia; under; application; relevant

The main objective of this project is two-fold: First, new experimental data of ammonia flames measured at high pressures and temperatures will be provided; second, a robust methodology to accurately measure laminar flame speeds using the optical and the pressure rise methods with special emphasis on radiation and buoyancy effects will be developed. To achieve this goal, laminar flame speeds of ammonia mixtures will be measured in two complementary experimental setups at conditions most relevant to applications, including high temperatures and pressures never explored before. Representative measurements in a spherical combustion vessel using optical imaging methods (Schlieren and Particle Image Velocimetry-PIV techniques) under normal gravity will be performed at ITV-RWTH Aachen to assess radiation effects. Complementary laminar flame speed measurements using a newly developed experimental setup allowing to record the pressure increase due to the flame propagation in the closed chamber and the evolution of the flame radius throughout the entire chamber will be conducted in a collaborative approach at ICARE-CNRS in Orléans, France. This technique was recently successfully used to obtain laminar flame speeds of methane/air mixtures at high-pressure and temperature. The method has the advantage of not being affected by radiation heat losses. Ammonia is well known for having low flame speeds and being thus subject to buoyancy effects. It is also planned to perform experiments under microgravity in the drop tower facility ZARM in Bremen with the ITV, RWTH Aachen chamber to suppress the influence of buoyancy while obtaining measurements for slow ammonia/air flames strongly impacted by radiation. The flame speeds measured under normal gravity, using both setups, and those measured under microgravity will then be used to provide a methodology to better account for heat losses by radiation of extremely slow burning flames.

该项目的主要目标有两个：首先，将提供在高压和高温下测量的氨火焰的新实验数据；其次，将开发一种使用光学和压力上升方法精确测量层流火焰速度的稳健方法，特别强调辐射和浮力效应。为了实现这一目标，将在与应用最相关的条件下，在两个互补的实验装置中测量氨混合物的层流火焰速度，包括以前从未探索过的高温和压力。将在亚琛 ITV-RWTH 进行正常重力下使用光学成像方法（纹影和粒子图像测速-PIV 技术）在球形燃烧容器中进行的代表性测量，以评估辐射影响。法国奥尔良 ICARE-CNRS 将以协作方式进行补充层流火焰速度测量，使用新开发的实验装置，记录封闭室内火焰传播引起的压力增加以及整个室内火焰半径的演变。该技术最近成功用于获得高压和高温下甲烷/空气混合物的层流火焰速度。该方法的优点是不受辐射热损失的影响。众所周知，氨的火焰速度较低，因此容易受到浮力效应的影响。还计划在不来梅的落塔设施 ZARM 与亚琛工业大学 ITV 室中进行微重力实验，以抑制浮力的影响，同时获得受辐射强烈影响的缓慢氨/空气火焰的测量结果。使用两种设置在正常重力下测量的火焰速度以及在微重力下测量的火焰速度将用于提供一种方法，以更好地解释极慢燃烧火焰的辐射造成的热损失。