A RAPID COMPRESSION MACHINE FOR CHEMICAL KINETICS STUDIES AT ELEVATED PRESSURES AND TEMPERATURES
A RAPID COMPRESSION MACHINE FOR CHEMICAL KINETICS STUDIES AT ELEVATED PRESSURES AND TEMPERATURES
复制标题
DOI：
10.1080/00102200600671898
复制
发表时间：
2007-01
影响因子：
1.9
通讯作者：
Gaurav Mittal;C. Sung
中科院分区：
文献类型：
--
作者：
Gaurav Mittal;C. Sung
设计并制造了一台用于高温高压下化学动力学研究的快速压缩机（RCM）。目前的RCM是气动驱动和液压致动和停止。机器的行程从7英寸到10英寸不等，间隙也可调节。压缩比可达21。光学可访问的反应室配备有用于测量压力和温度的传感器。此外，在反应室中结合了快速取样装置，用于确定特定压缩后时间的物质浓度。使用STAR-CD CFD软件包对活塞圆柱形表面上的故意加工的缝隙进行了优化，以抑制卷起涡流的形成并提供反应混合物的均匀核心。使用丙酮的平面激光诱导荧光的温度映射表明，卷起涡确实被抑制通过使用本缝隙活塞。用惰性气体或反应性混合物的实验证明了压力迹线的再现性。压缩过程也被证明是非常迅速的，没有任何显着的机械振动。测量表明，可以获得高达50巴和大于1000 K的高度可重复的压缩条件。考虑热损失的数值模型也被开发来模拟RCM数据。这项工作文件的设计和操作，目前的RCM，以及建立其适用性的燃烧研究。
A rapid compression machine (RCM) has been designed and fabricated for the purpose of chemical kinetics studies at elevated pressures and temperatures. The present RCM is pneumatically driven and hydraulically actuated and stopped. Stroke of the machine varies from 7 to 10 inches and clearance is also adjustable. Compression ratio of up to 21 can be obtained. The optically-accessible reaction chamber is equipped with sensors for the measurements of pressure and temperature. In addition, a rapid sampling apparatus is incorporated in the reaction chamber for determining species concentration at specific post-compression time. A deliberately machined crevice on the cylindrical surface of the piston has been optimized, using STAR-CD CFD package, in order to suppress the formation of the roll-up vortex and provide a homogeneous core of reaction mixture. Temperature mapping using planar laser induced fluorescence of acetone shows that roll-up vortex is indeed suppressed by using the present creviced piston. Experiments with either inert gases or reactive mixtures demonstrate the reproducibility of pressure traces. Compression process is also shown to be very rapid and free from any significant mechanical vibrations. Measurements show that highly repeatable compressed conditions of up to 50 bar and greater than 1000 K can be obtained. A numerical model accounting for heat loss is also developed to simulate the RCM data. This work documents the design and operation of the present RCM as well as establishes its suitability for combustion studies.