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总结和分析了3种常用的典型混合效率评估方法,为了提高对混合程度的评估精度和客观性,提出了3种新的混合程度评估方法和指标:流场混合效率,可燃混合效率和适燃区域比例.流场混合效率能够客观评估流场结构的混合性能和增混措施的效果;可燃混合效率和适燃区域比例,结合了流场中的熄火边界参数,能够将燃料的分布及混合程度直接与点火燃烧联系,能够客观评估不同程度的贫油和富油流场的混合程度,能够合理地预测燃烧可能发生的区域.最后通过二维算例比较了新旧方法的评估结果,验证了新评估方法的合理性.
In this paper, three commonly used methods for evaluating the mixing efficiency are summarized and analyzed. In order to improve the evaluation accuracy and objectivity of the mixing degree, three new evaluation methods and indexes of the mixing degree are proposed: flow mixing efficiency, combustible mixing efficiency and combustion Area ratio.The mixing efficiency of flow field can objectively evaluate the mixing performance of flow field structure and the effect of adding mixing measures.The combustible mixing efficiency and proportion of burning area combine with the flameout boundary parameters in the flow field to make the distribution and mixing degree of the fuel Directly related to the ignition and combustion, can objectively assess the degree of mixing of different levels of lean and rich oil flow field, and can reasonably predict the possible combustion area.Finally, the two-dimensional example is used to compare the evaluation results of old and new methods, Evaluate the rationality of the method.