The study examines numerically the non-reacting flow and mixing characteristics inside a single tube of a micromixer burner for potential zero-emission premixed oxy-fuel combustion applications, such as gas turbines. The aim is to investigate how the geometrical parameters can affect the mixing quality in an oxy-fuel reactant mixture consisting of CH₄, O₂, and CO₂. The ranges of design parameters are fuel inlet diameter (from 0.2 to 1.0 mm), number of fuel holes (4 and 6), and tube length (from 5D to 15D). It was found that the mixing quality is significantly improved by increasing the tube length. The results also showed that mixing quality is not directly dependent on fuel hole size but on the ratio of main flow to jet flow momenta. At fixed total fuel mass flow rate, the mixing quality depreciates when the number of fuel holes is increased from four to six for all hole diameters, except for the smallest one of 0.2 mm. The peak mixing quality was achieved with fuel hole diameters of 0.25 mm and 0.2 mm for the micromixer tubes with four and six inlet holes, respectively. The results showed that micromixers can achieve high mixing quality at a reasonable burner height.

这项研究从数值上检查了微混合器燃烧器单管内部的非反应性流量和混合特性，以用于潜在的零排放预混合氧燃料燃烧应用，例如燃气轮机。目的是研究几何参数如何影响由CH ₄，O ₂和CO ₂组成的含氧燃料反应混合物中的混合质量。设计参数的范围是燃料入口直径（0.2到1.0毫米），燃料孔的数量（4和6）以及管长（5D到15D）。已经发现，通过增加管长可以显着改善混合质量。结果还表明，混合质量不直接取决于燃料孔的大小，而是取决于主流与喷射流的比值a。在固定的总燃料质量流量下，当所有孔直径的燃料孔数从4个增加到6个（最小的0.2毫米除外）时，混合质量都会下降。对于分别具有四个和六个入口孔的微型混合器管，通过燃料孔直径为0.25 mm和0.2 mm达到了最高混合质量。结果表明，微混合器可以在合理的燃烧器高度下实现高混合质量。