Tracer-free, non-intrusive, time- and space-resolved temperature and scalar measurements

无示踪剂、非侵入式、时间和空间分辨的温度和标量测量

• 批准号: EP/T030801/1
• 负责人: Simone Hochgreb
• 金额: $ 50.14万
• 依托单位: University of Cambridge
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2020
• 资助国家: 英国
• 起止时间: 2020 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FT030801%2F1
• 关键词: Tracer; free; non; intrusive; time

The growth in air transport, and the need for base and balance thermal power in an electricity-powered future centres creates a pressing need for low emission, high efficiency gas turbines, particularly regarding NO, CO and soot. The key variables determining the production of these pollutants in the product gases are the local instantaneous product gas temperature and the local fuel fraction. The large fluctuations in gas temperature, and the exponential dependence of pollutant production on temperature means that predictions of NO, CO and soot in combustion are not possible without suitable accurate statistics of instantaneous local temperature measurements. Yet there are very few such measurements in practical devices to validate models. Local instantaneous temperature measurements in high pressure radiant devices require optical techniques which are rather complex for industrial laboratories. This proposal aims to extend a much simpler technique for the purpose to allow tracer free local measurements of temperature, pressure and water vapour. Laser-induced grating spectroscopy (LIGS) has been shown to work even in highly radiant, soot-prone environments, and may also enable local measurements of additional target scalars (water vapour, pressure) using the easily accessible Nd:YAG laser wavelength of 1064 nm. The technique uses both the electrostrictive mode and weak absorption spectral lines in this wavelength range to enable measurements of both temperature and relative water concentrations in realistic devices. The signal to noise of the technique improves with pressure, a significant advantage for realistic devices, especially in environments such as gas turbines, which are prone to large amounts of radiant luminosity. The project will extend the current capabilities of the technique from point measurements to spatially resolved line measurements. Finally, it will extend the pump laser wavelength into near infrared, which will unlock the ability of the technique to use strong absorption lines for a range of widely available species (water, carbon dioxide and hydrocarbons), using industrial lasers at high repetition rates. The final outcome of the project will be the development of an instrument and method for non-intrusive temperature and species measurements in high temperature, high pressure practical reacting flows, requiring only a fraction of the cost of previous techniques of comparable precision. Demonstration measurements will be produced in a high pressure, high temperature, realistic industrial facility. Data produced during these measurements will also allow researchers and developers to review and validate robust reacting flow models for industry and open up the possibilities for optimisation of clean energy conversion devices. The plan for technology transfer is ensured by partnering with a company (Dantec) that has already packaged and commercialised similar instruments. An extension of the validation measurements to other industrial facilities at Rolls-Royce is planned once the instrument development and demonstration has been successfully concluded. Finally, the project will also offer opportunities to PhD students associated with the Energy CDT at Cardiff.

航空运输的增长，以及未来电力中心对基础和平衡热能的需求，迫切需要低排放、高效率的燃气轮机，特别是在 NO、CO 和烟尘方面。决定产物气体中这些污染物的产生的关键变量是当地瞬时产物气体温度和当地燃料分数。气体温度的大幅波动以及污染物产生对温度的指数依赖性意味着，如果没有对瞬时局部温度测量进行适当的准确统计，就不可能预测燃烧中的 NO、CO 和烟灰。然而，在实际设备中很少有这样的测量来验证模型。高压辐射装置中的局部瞬时温度测量需要光学技术，这对于工业实验室来说相当复杂。该提案旨在扩展一种更简单的技术，以实现温度、压力和水蒸气的无示踪剂局部测量。激光诱导光栅光谱 (LIGS) 已被证明即使在高辐射、易产生烟尘的环境中也能工作，并且还可以使用易于获取的 1064 nm 波长的 Nd:YAG 激光对其他目标标量（水蒸气、压力）进行本地测量。该技术使用该波长范围内的电致伸缩模式和弱吸收谱线，从而能够测量实际设备中的温度和相对水浓度。该技术的信噪比随着压力的增加而提高，这对于现实设备来说是一个显着的优势，特别是在燃气轮机等容易产生大量辐射光度的环境中。该项目将将该技术的当前功能从点测量扩展到空间分辨线测量。最后，它将泵浦激光波长扩展到近红外，这将释放该技术的能力，以高重复率使用工业激光器，对一系列广泛使用的物质（水、二氧化碳和碳氢化合物）使用强吸收线。该项目的最终成果将是开发一种仪器和方法，用于在高温、高压实际反应流中进行非侵入式温度和组分测量，其成本仅为先前同等精度技术的一小部分。演示测量将在高压、高温、真实的工业设施中进行。这些测量过程中产生的数据还将使研究人员和开发人员能够审查和验证强大的工业反应流模型，并为优化清洁能源转换设备开辟可能性。技术转让计划是通过与一家已经封装并商业化类似仪器的公司（Dantec）合作来确保的。一旦仪器开发和演示成功完成，计划将验证测量扩展到罗尔斯·罗伊斯的其他工业设施。最后，该项目还将为卡迪夫能源 CDT 相关的博士生提供机会。

项目成果

3D flame surface measurements in low-turbulence Bunsen flames via scanning and orthogonal cross-planar techniques

• DOI: 10.1016/j.combustflame.2023.113103
• 发表时间: 2023-12
• 期刊: Combustion and Flame
• 影响因子: 4.4
• 作者: Yutao Zheng;Lee Weller;Simone Hochgreb

Spatial Temperature and Water Molar Concentration Measurements Using Thermal and Electrostrictive Laser-Induced Grating Spectroscopy During Operation of a Swirl Burner at Pressure

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
• 发表时间: 2024
• 期刊: Journal of Engineering for Gas Turbines and Power
• 作者: Weller L

3D Flame surface density measurements via orthogonal cross-planar mie scattering in a low-turbulence bunsen flame

• DOI: 10.1016/j.proci.2022.07.076
• 发表时间: 2022-08
• 期刊: Proceedings of the Combustion Institute
• 影响因子: 3.4
• 作者: Yutao Zheng;L. Weller;S. Hochgreb

Spatial temperature and water molar concentration measurements using thermal and electrostrictive LIGS during operation of a swirl burner at pressure

在旋流燃烧器在压力下运行期间，使用热致伸缩 LIGS 和电致伸缩 LIGS 测量空间温度和水摩尔浓度

• 发表时间: 2023
• 作者: Weller, L

High-frequency measurement of concentration in an isothermal methane-air gas mixture using spontaneous Raman spectroscopy.

• DOI: 10.1038/s41598-023-37649-1
• 发表时间: 2023-08-01
• 期刊: SCIENTIFIC REPORTS
• 影响因子: 4.6
• 作者: Rodrigues, Jocelino;Weller, Lee;De Domenico, Francesca;Hochgreb, Simone
• 通讯作者: Hochgreb, Simone