Counterflow diffusion flames serve as crucial experimental platforms for studying fuel combustion characteristics (such as laminar burning velocity, extinction limits, ignition temperature, etc.) and the generation of pollutants (like NOx, soot, etc.). Counterflow diffusion flames possess quasi-one-dimensional properties, making them more suitable for employing various advanced optical or intrusive combustion testing methods. These methods enable high-fidelity, high-spatial-resolution measurements of flow fields, temperature fields, chemical composition, and particulate concentration.

Our laboratory possesses extensive experience in the design and utilization of counterflow diffusion flame burners. Through previous research efforts, we have delved deeply into the design methodologies of counterflow diffusion flame burners, combustion diagnostic techniques, and numerical simulation approaches. The laboratory is equipped to provide research teams interested in conducting combustion studies using counterflow flames with burner systems (including flow control, electric translation stages, and corresponding control software) as well as combustion diagnostic-related technical services.

As the global push for energy conservation and emissions reduction continues, zero-carbon fuels represented by ammonia are gaining increasing attention and significance within both the academic and industrial communities worldwide. Ammonia, characterized by its high ignition temperature and narrow flammability range, presents challenges in achieving stable ignition and complete combustion. Swirl combustion, as the most widely adopted industrial combustion mode, represents a crucial pathway to achieve stable ammonia combustion. Developing efficient and low-pollution combustion technologies to mitigate NOx generation stands as a significant challenge in ammonia combustion utilization today. The swirl combustion platform serves as a fundamental experimental base for studying the combustion characteristics of zero-carbon ammonia fuels (such as extinction limits, flame stabilization mechanisms) and pollutant generation characteristics. This platform allows for systematic exploration of ignition/extinction behaviors, stabilization mechanisms, and the investigation of NOx generation characteristics and low-NOx combustion techniques.

Based on the laboratory's innovative passive-active hybrid swirl stabilization technology, low-resistance flow channels, and honeycomb rectification design, the currently developed pure ammonia swirl combustion platform can achieve 100% pure ammonia premixed combustion/non-premixed combustion, natural gas blended with ammonia combustion, and 100% pure natural gas combustion. Leveraging the aforementioned core technologies, the laboratory is capable of providing research teams interested in swirl flames for combustion research with burner systems (including flow control, combustion systems, etc.) and combustion diagnostic-related technical services.

Accurate measurement of high-temperature ammonia leakage in flue gases is crucial for various aspects of high-temperature energy and power equipment operation. This includes processes such as natural gas blended with ammonia combustion, pure ammonia combustion flameout prediction, safe operation, active control of Selective Catalytic Reduction (SCR) systems, precise regulation of Selective Non-Catalytic Reduction (SNCR), and assessment of combustion efficiency. In the process of pure ammonia combustion, the only combustion products are water vapor and nitrogen gas. For pure ammonia/oxygen combustion, the molar fraction of water vapor in the flue gas can be as high as 75%, significantly affecting the measurement of ammonia in the gas due to the extremely high humidity.

Based on the laboratory's innovative high-temperature/collision broadening calibration technology and experimentally determined high-precision molecular high-temperature spectroscopic parameters, the laboratory has developed trace ammonia leakage monitoring sensors suitable for ultra-high humidity environments. The currently developed high-temperature high-humidity ammonia leakage sensor achieves a minimum detection limit of 0.1 ppm (customizable), a response time of 2 seconds, a measurement concentration range of 0.1-3000 ppm (customizable), and an accuracy of ±2% for high-humidity (water vapor concentration range between 10-40%) ammonia detection. The sensor can communicate with a control computer through RS485 or direct computer connection. Additionally, a high-humidity water vapor generator has been developed to regulate humidity in high-humidity environments. After successfully achieving quantitative detection of high-temperature high-humidity ammonia leakage in the laboratory setting, the developed trace ammonia leakage sensor will be applied to residual ammonia detection in natural gas blended with ammonia counterflow flames and high-temperature industrial kiln ammonia leakage monitoring.

Methane and ammonia, as typical hydrocarbon and zero-carbon fuels respectively, have drawn significant attention in terms of leak detection. Fuel leaks not only harm ecosystems and disrupt atmospheric nitrogen cycles but also contribute to the formation of particulate matter (PM). They pose risks to industrial safety, greatly impacting the entire lifecycle utilization of fuels and the safe and stable operation of high-temperature energy and power equipment.

Our laboratory boasts extensive experience in designing and developing laser-based fuel leak sensors. The developed gas leak detection sensors and systems have played a crucial role in pipeline leak detection, pure ammonia test furnaces, and operational debugging of industrial kiln production lines. Leveraging the laboratory's innovative distributed optical fiber sensing and compact integration technologies, the currently developed ammonia leak sensor achieves a minimum detection limit of 1.0 ppm, a response time of 2 seconds, a measurement concentration range of 1-10000 ppm (customizable), and an accuracy of ±2% for ammonia detection.

Laser Absorption Spectroscopy (LAS) technology is a representative non-contact temperature measurement technique. By measuring the intensity change of specific wavelength laser before and after passing through the target area, it enables rapid, quantitative, calibration-free, and in-situ temperature measurement. This method offers advantages such as high sensitivity, high accuracy, and a straightforward experimental setup layout. It has been successfully applied to temperature measurements in laboratory-scale flames and industrial combustion propulsion systems.

Our laboratory possesses extensive experience in designing and developing high-temperature laser absorption spectroscopy sensors and conducting complex and challenging on-site diagnostic tests. Over the past 7 years of research, various fundamental flames (standard laminar premixed flames, counterflow diffusion flames, turbulent jet flames, and Bunsen flames) have been studied comprehensively for temperature measurement methods. The laboratory has developed a wide-temperature-range flame temperature measurement system suitable for spatial resolution measurements. This includes standard laminar premixed non-sooting flames and sooting flames generated by the McKenna burner, standard diffusion flames produced by counterflow combustion burners, and turbulent jet flames produced by heated coflow jet burners.