一种用于化学动力学研究的新型射流搅拌反应器
A new jet-stirred reactor for chemical kinetics investigations
摘要：
设计了一种新型的射流搅拌反应器，用于研究低丹科勒数（Da，停留时间与化学反应时间之比）下的燃烧过程，即化学动力学。在这种新的设计中，多个冲击湍流射流被用来搅拌混合物。本工作的目的是确定一个最佳配置的多对撞击射流和出口端口作为喷射搅拌反应器（JSR）的化学动力学实验。基于这一动机，使用使用RANS -雷诺应力模型的ANSYS-FLUENT计算来模拟这种几何结构中的混合和反应，并将其性能与经典JSR（Matras & Villermaux 1973年引入的4个射流In Plus（+）模式（4JIPP）; Dagaut等人1986年;等）进行比较。结果表明，8个射流的配置，每个由同心环形出口（CIAO）包围，在一个假想的立方体由球形腔室包围的角落提供了更均匀的成分和温度，从而更接近理想化的假设在充分搅拌的反应器理论，即使在Da值高于其他JSR实验。此外，CIAO设计得到的反应速率常数比经典JSR设计更接近实际值。
英文摘要：
A novel jet-stirred reactor was designed to study combustion processes at low Damköhler number (Da, ratio of residence time to chemical time), i.e. chemical kinetics. In this new design, multiple impinging turbulent jets are used to stir the mixture. The goal of this work is to identify an optimal configuration of multiple pairs of impinging jets and outlet ports for as a Jet-Stirred Reactor (JSR) for chemical kinetics experiments. With this motivation, ANSYS-FLUENT computations using the RANS - Reynolds Stress Model were used to simulate mixing and reaction in such geometries and their performance was compared to classical JSR (4 Jets In Plus (+) Pattern (4JIPP) introduced by Matras & Villermaux 1973; Dagaut et al. 1986; etc.). Results showed that a configuration of 8 jets, each surrounded by a concentric annular outlet (CIAO), at the corners of an imaginary cube circumscribed by a spherical chamber provided far more uniform composition and temperature and thereby more nearly match the idealizations assumed in well-stirred reactor theory, even at values of Da higher than those accessible to other JSR experiments. Moreover, the CIAO design yielded inferred reaction rate constants that were much to the actual values than the classical JSR design.
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