Development of temperature evaluation of pure Rotational Coherent Anti-Stokes Raman Scattering (RCARS) spectra influenced by spatial averaging effects
Development of temperature evaluation of pure Rotational Coherent Anti-Stokes Raman Scattering (RCARS) spectra influenced by spatial averaging effects
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DOI：
10.1016/j.proci.2014.07.067
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发表时间：
2015
影响因子：
6.9
通讯作者：
Yi Gao;T. Seeger;A. Leipertz
中科院分区：
文献类型：
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作者：
Yi Gao;T. Seeger;A. Leipertz
当探头体积包含温度梯度时，CARS温度测量中会出现空间平均效应的问题，这种情况在湍流反应流中经常遇到，其中流型不规则，温度梯度通常很陡峭。在本工作中，建立了一个新的双温度模型来处理空间平均效应，并将其应用于在Wolfhard-Parker缝隙燃烧器的预混火焰上测量的纯旋转CARS光谱。与传统的单温拟合模型相比，提出了一种改进的光谱拟合方法，并利用双温度拟合模型进行了温度和浓度的估算。最后，在湍流喷雾火焰中验证了双温度模型的可行性。
The issue of spatial averaging effect arises in CARS temperature measurements when the probe volume contains temperature gradients, a situation frequently encountered in turbulent reacting flows where flow patterns are irregular and temperature gradients are typically steep. In present work, a new dual-temperature fitting model is developed to deal with the spatial averaging effect and then applied to evaluate the measured pure rotational CARS spectra performed on a premixed flame of a Wolfhard–Parker slot burner. Comparing with the traditional single-temperature fitting model, an improved spectral fitting and therefore, temperature and concentration evaluation by using the dual-temperature fitting model, is demonstrated. Finally, the feasibility of the dual-temperature model is shown in turbulent spray flame.