Influence of Fuel Characteristics in a Correlation to Predict Lean Blowout of Bluff-Body Stabilized Flames
Influence of Fuel Characteristics in a Correlation to Predict Lean Blowout of Bluff-Body Stabilized Flames
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DOI：
10.1115/gt2015-43433
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发表时间：
2015-06
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影响因子：
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通讯作者：
Bethany Huelskamp;B. Kiel;P. Gokulakrishnan
中科院分区：
文献类型：
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作者：
Bethany Huelskamp;B. Kiel;P. Gokulakrishnan
本研究采用空军研究实验室（AFRL）收集的实验数据以及回顾过去文献的数据，通过使用最小二乘曲线拟合方法来开发预测精益井喷的相关性。将文献中的数据与AFRL的数据相结合，可以在数据集中发现速度、火焰支架直径和形状、压力、温度和燃料等方面的显著变化。气体、单组分燃料和多组分喷气燃料都包括在研究范围内。该研究报告了新的喷气燃料井喷数据。利用详细的化学动力学机制计算的层流火焰速度和点火延迟时间，在关联中确定了与贫化井喷相关的化学时间尺度。本文给出的相关性表明，崖体稳定火焰的稀薄井喷取决于Damkohler数，其中燃料变化是一个重要因素。结果表明，喷嘴直径与喷嘴唇速的比值对喷嘴的倾爆有一定的影响。该比率表示Damkohler数中的流体力学时间标度。压力、温度和燃料的氢碳比会影响混合物的反应性，从而影响Damkohler数中的化学时间标度。对于有限的数据集，点火延迟时间是化学时间标度的充分表示。©2015 asme
This study employed experimental data collected at the Air Force Research Laboratory (AFRL) as well as data from a review of past literature to develop a correlation for predicting lean blowout through the use of a least-squares curve-fit method. Combining data from the literature with data from AFRL allowed significant variations within the dataset with regard to velocity, flameholder diameter and shape, pressure, temperature, and fuel. Gaseous, single-component fuels as well as multi-component jet fuels were included in the study. The study reports new jet fuel blowout data. The laminar flame speed and ignition delay time calculated using detailed chemical kinetics mechanisms were used in the correlations to determine the chemical timescales relevant to lean blowout.The correlation presented here indicates that the lean blowout of bluff-body stabilized flames is dependent on the Damkohler number, with fuel variation being a significant factor. The ratio of the flameholder diameter to the lip velocity was found to influence the lean blowout. This ratio represents the fluid-mechanic timescale in the Damkohler number. Pressure, temperature, and the hydrogen-to-carbon ratio of the fuel affect the reactivity of the mixture, contributing to the chemical timescale in the Damkohler number. For a limited dataset, the ignition delay time is an adequate representation of the chemical timescale.© 2015 ASME