The three-environment PDF approach has been applied to numerically investigate a series of the turbulent piloted premixed flames in the piloted premixed jet burner (PPJB). In this study, computations are made for three flames (PM1-100, PM1-150 and PM1-200). In terms of the unconditional means and conditional statistics, numerical results are reasonably well agreed with experimental data. At the central jet mixture fraction and temperature spaces, the predicted environment-conditional statistics at the near-injector region clearly identify the dual premixed flame modes established by the stoichiometric pilot flame and the lean premixed central jet. The present MEPDF approach together with the IEM micro-mixing model and the skeletal chemistry qualitatively predicts the ignition, local extinction and reignition process in the three-stream highly stretched piloted premixed flame even if there exist certain discrepancies. In terms of [CO][OH]|_1400 K and temperature PDFs, the detailed discussions were also made for the effects of micro-mixing models (IEM, EIEM) and chemical mechanism (skeletal, GRI) on the local extinction and reignition characteristics.

三环境PDF方法已被应用于对预混合喷射燃烧器（PPJB）中的一系列湍流预混合火焰进行数值研究。在这项研究中，对三个火焰（PM1-100，PM1-150和PM1-200）进行了计算。在无条件均值和条件统计方面，数值结果与实验数据相当吻合。在中央射流混合气分数和温度空间，在近喷射器区域的预测环境条件统计数据清楚地确定了由化学计量先导火焰和稀薄预混中央射流建立的双重预混火焰模式。目前的MEPDF方法与IEM微混合模型和骨骼化学一起定性地预测了点火，即使存在某些差异，三流高拉伸引燃预混火焰中的局部灭绝和复燃过程也是如此。以[CO] [OH] |_{1400  K}和温度PDFs，还详细讨论了微混合模型（IEM，EIEM）和化学机理（骨架，GRI）对局部灭绝和再燃特性的影响。