Chemiluminescence imaging of flames with partial premixing

我请求资助购买火焰化学发光成像装置。 化学发光是指原子或分子受到化学反应的电子激发而发出的光。在falmes中，反应速率的强度与OH* 和CH* 化学发光的大小成比例，并且其测量绘制出燃烧过程放热的空间和时间分布和变化。火焰化学发光将通过使用增强型成像相机对燃烧区进行高速拍摄来获得。拟议的设备将用于支持对低温氧化的研究，其中火焰是部分预混合的，并含有大量的再循环燃烧产物。该研究计划的重点是在实验室规模实现的“无焰氧化”燃烧器，已被申请人在全面调查之前。这些都是污染极低的高效燃烧装置，依靠将燃料和空气直接单独喷射到炉中，夹带燃烧产物并降低火焰温度和NOx排放。小规模的实现是反向非预混火焰燃烧器，其具有输送空气、燃料、惰性气体（例如N2）和加热的燃烧产物的同向流动流。这种燃烧器在火焰可视化、稳定极限和温度方面的初步表征已经完成，并发表了结果。为了取得进一步的定性进展，预混合的水平和产品气体夹带对反应速率的影响需要量化，化学发光是一个理想的技术与它做到这一点。所要求的成像系统也将适用于其他低温燃烧研究，包括均质充量压缩点火（HCCI）在发动机中，燃烧与H2和CO补充。化学发光技术是一种令人兴奋的火焰诊断技术，为培养数据采集，图像处理和燃烧可视化领域的研究生提供了充足的机会。

I am requesting funding to purchase the apparatus for chemiluminescence imaging in flames.  Chemiluminescence is the light emission from an atom or molecule that is electronically exited by a chemical raction. In falmes, the intensity of the reaction rate is proportional to the magnitude of OH* and CH* chemiluminescence and its measurements map out the spatial and temporal distribution and variations of the combustion process heat release. The flame chemiluminescence will be acquired with high speed filming of the combustion zone with an intensified imager camera. The proposed equipment will be used in support of research on low temperature oxidation in which flames are partially premixed and contain large amounts of recirculated combustion products. This research program is focused on a laboratory scale realization of "flameless oxidation" burners that have been investigated by the applicant before at full-scale. These are extremely low polluting, efficient combustion devices relaying on separate injection of fuel and air directly into the furnace, entraining combustion products and lowering the flame temperature and NOx emissions. The small-scale realization is an inverse non-premixed flame burner with co-flowing streams that deliver air, fuel, inert gas (e.g. N2), and heated combustion products. Initial characterization of such a burner in terms of flame visualization, stability limits, and temperatures was completed and results were published. To make further qualitative progress, the level of premixing and the effects of product gasses entrainment on the reaction rate need to be quantified, and chemiluminescence is an ideal technique with which to do it.  The requested imaging system will be also suitable for other low temperature combustion studies, including Homogenous Charge Compression Ignition (HCCI) in engines, and combustion with H2 and CO supplementation. The chemiluminescence technique is an exciting flame diagnostics technique that present ample opportunities for training graduate students in the area of data acquisition, image processing and combustion visualization.