Spatial Temperature and Water Molar Concentration Measurements Using Thermal and Electrostrictive Laser-Induced Grating Spectroscopy During Operation of a Swirl Burner at Pressure
Spatial Temperature and Water Molar Concentration Measurements Using Thermal and Electrostrictive Laser-Induced Grating Spectroscopy During Operation of a Swirl Burner at Pressure
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在压力下旋流燃烧器运行期间使用热和电致伸缩激光诱导光栅光谱测量空间温度和水摩尔浓度
DOI：
10.1115/1.4063865
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发表时间：
2024
期刊：
影响因子：
--
通讯作者：
Weller L
中科院分区：
文献类型：
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作者：
Weller L
将激光诱导光栅光谱（LIGS）技术应用于高压燃烧装置。利用热和电致伸缩LIGS信号获得了瞬时（亚μs）、空间分辨（5mm以内）的温度和水的摩尔分数测量值。温度高达1800 K，水的摩尔分数在0.01和0.12之间进行测量。开发了一种新的分析方法，从火焰刷区域内测量信号的频率中提取温度，其中混合物包含燃烧和未燃烧的气体。平均产品温度比标称等效比的绝热温度低8%，比未校正辐射损失的热电偶测量值高14%。这项工作代表了LIGS在高压湍流旋转火焰中的首次应用，为未来在其他实际应用中的应用开辟了潜力。与技术部署相关的挑战被描述为克服这些困难的潜在措施。
Laser-Induced Grating Spectroscopy (LIGS) was applied in a high-pressure combustion facility. Instantaneous (sub-μs), spatially resolved (within 5 mm) measurements of temperature and molar fractions of water were obtained using thermal and electrostrictive LIGS signals. Temperatures up to 1800 K and water molar fractions between 0.01 and 0.12 were measured. A new analytic approach was developed to extract temperature from the frequencies of the measured signal within the flame brush region, where mixtures contain both burnt and unburnt gases. Mean product temperatures are shown to be 8% lower than the adiabatic temperatures for the nominal equivalence ratio, and 14% higher than measurements made with a thermocouple, uncorrected for radiation losses. This work represents the first application of LIGS to a high-pressure, turbulent swirling flame, opening up the potential for future uses in other real-world applications. Challenges associated with the deployment of the technique are described as are potential measures to overcome these difficulties.