Details

Autor(en) / Beteiligte

• Jeon, Min-Gyu
• Cho, Gyeong-Rae

Titel

A study on continuous temperature measurement using direct absorption spectroscopy for fuel-air premixed flames

Ist Teil von

• Journal of Mechanical Science and Technology, 2023, 37(8), , pp.4109-4116

Ort / Verlag

Seoul: Korean Society of Mechanical Engineers

Erscheinungsjahr

2023

Link zum Volltext

Quelle

SpringerLink Journals

Beschreibungen/Notizen

• Recently, there has been an increasing emphasis on the efficient utilization of energy resources. Precise control of gas injection can aid in achieving this objective. However, measuring the temperature and concentration of gases simultaneously presents a challenge. Therefore, it is essential to monitor and track irregular behavior, such as combustion processes, in real-time without interfering with the combustion flow. This study proposes a non-contact optical measurement method that does not disrupt the combustion flow. Direct absorption spectroscopy (DAS) is used to extract the absorption line during optical measurements. Since the choice of absorption line extraction method can affect temperature measurement results, the performance of linear and non-linear interpolation methods is compared. Temperature measurements of stable flames were compared using a thermocouple and the computed tomography-tunable diode laser absorption spectroscopy (CT-TDLAS) method. The relative temperature error at the center of the measurement area between the two measurement methods was found to be approximately 2%. To overcome the real-time temperature measurement limitation of thermocouples, the combustion process of premixed flames is measured using computed tomography (CT) technology. Additionally, to evaluate the real-time measurement superiority of CT-TDLAS, the combustion state is assessed by comparing the intensity of a single-camera image with simultaneous measurement using CT-TDLAS. The results demonstrate that the image intensity of the flame captured by a single camera and the temperature field measured by CT-TDLAS exhibit the same trends during the extinguishing process. Consequently, the superiority of CT-TDLAS measurement for temperature measurement is demonstrated, and the real-time measurement superiority is confirmed.