Comparison of Two Methods to Predict Boundary Layer Flashback Limits of Turbulent Hydrogen-Air Jet Flames
Comparison of Two Methods to Predict Boundary Layer Flashback Limits of Turbulent Hydrogen-Air Jet Flames
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两种预测氢-空气湍流射流火焰边界层回火极限方法的比较
DOI：
10.1007/s10494-017-9882-2
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
McDonell
中科院分区：
文献类型：
--
作者：
Hoferichter;Hirsch;Sattelmayer;Kalantari;Sullivan-Lewis;McDonell
在燃气涡轮机燃烧中，特别是对于高氢含量的燃料，火焰回火到预混合器中是一个严重的问题。特别令人感兴趣的是上游火焰在壁边界层内传播的风险。因此，设计者寻求预测最小流速以防止边界层回火的方法。本文第一部分对边界层回火极限的两种预测方法进行了总结和比较。第一种方法是基于加州尔湾大学（UCI）开发的无量纲参数的Damköhler相关性。该关联式是根据在高压和高温（即p= 3-7 bar，Tu= 300-500 K，λ = 0.3-0.6）下收集的实验数据开发的，并成功地应用于商业燃气涡轮机燃烧室。Damköhler关联式由于其简单性，对于燃气涡轮机燃烧器的设计是有吸引力的。但其适用性仅限于其最初设计的湍流燃烧状态。第二种方法称为“火焰角理论”。它是在慕尼黑工业大学（TUM）开发的，基于对边界层闪回物理过程的描述。该方法已在大气压和宽范围的预热温度和当量比（Tu= 293-673 K，ε = 0.35-1.0）的实验数据进行了验证。由于它是基于一组子模型描述边界层回火的物理过程，因此如果子模型合适，它应该普遍适用于所有操作条件。为了验证这一点，本文的第二部分将火焰角理论应用于高压条件。与Damköhler关联式的结果比较表明，预测的回火极限在合理的范围内。然而，Damköhler相关性和火焰角理论之间的协议程度强烈依赖于当量比，因为Damköhler相关性不占不同的氢-空气混合物的火焰拉伸的变化的敏感性。因此，在TUM从火焰角理论推导出了修正的Damköhler关联式，并在本文的第三部分中给出。该关联式结合了其他两种方法的优点，因为它具有高可用性，并且通常适用于所有操作条件。
Flame flashback into the premixer is a serious issue in gas turbine combustion, especially for high hydrogen content fuels. Of particular interest is the risk of upstream flame propagation inside the wall boundary layer. Consequently, methods to predict the minimum flow velocities to prevent boundary layer flashback are sought by designers. In the first part of this paper two methods to predict boundary layer flashback limits are summarized and compared. The first method is a Damköhler correlation based on non-dimensional parameters developed at University of California Irvine (UCI). The correlation was developed based on the gathered experimental data at elevated pressures and temperatures (i.e.p= 3–7 bar,Tu= 300–500 K,ϕ= 0.3–0.6) and successfully applied to a commercial gas turbine combustor. Due to its simplicity the Damköhler correlation is attractive for the design of gas turbine burners. But its applicability is limited to the turbulent combustion regime for which it was originally designed. The second method is called the “flame angle theory”. It was developed at Technische Universität München (TUM) and is based on a description of the physical process of boundary layer flashback. This method has been validated with experimental data at atmospheric pressure and a wide range of preheating temperatures and equivalence ratios (Tu= 293–673 K,ϕ= 0.35–1.0). Since it describes the physical process of boundary layer flashback based on a set of sub-models it should be generally applicable to all operating conditions if the sub-models are appropriate. To verify this, the flame angle theory is applied to high pressure conditions in the second part of this paper. A comparison with results from the Damköhler correlation shows that the predicted flashback limits are in a reasonable range. However, the degree of agreement between Damköhler correlation and flame angle theory strongly depends on equivalence ratio because the Damköhler correlation does not account for the changing susceptibility of different hydrogen-air mixtures to flame stretch. For that reason, a modified Damköhler correlation has been derived at TUM from the flame angle theory and is presented in the third part of this paper. This correlation combines the advantages of the other two methods as it features high usability and is generally applicable to all operating conditions.
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DOI：
--
发表时间：
1948
期刊：
影响因子：
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发表时间：
1948
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DOI：
--
发表时间：
2015
期刊：
影响因子：
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DOI：
--
发表时间：
1952
期刊：
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