An experimental study on the instability of RP-3 aviation kerosene/air premixed flame. (15th January 2023)

• Record Type: Journal Article
• Authors: Liu, Yu; Rao, Dawei; Wang, Enqing; Ma, Hongan; Zheng, Weilin; Zeng, Wen
• Is Part Of: Fuel. Volume 332(2023)Part 1
• Publication Date: 2023-01-15
• Subjects: RP-3/air premixed flame -- Transition acceleration onset -- Critical flame radius -- Acceleration exponent -- Onset of similarity acceleration; Fuel -- Periodicals; Coal -- Periodicals; Coal; Fuel; Periodicals; 662.6
• DOI: 10.1016/j.fuel.2022.126038
• Languages: English
• ISSNs: 0016-2361

Abstract

Highlights: This paper focused on the instability of RP-3 aviation kerosene/air premixed flame. Experiments were carried out in a constant volume chamber to study the unstable flame propagation processes of RP-3/air premixed flame over wide initial conditions. The transition acceleration onset was measured and the effects of diffusional-thermal, hydrodynamic instability and stretch rate in spherically expanding flames on R cr were analyzed. The acceleration exponent α was obtaind and with the increase of equivalence ratio, the changes in α and its corresponding flame radius were analyzed. Abstract: In the present work, experiments were carried out in a constant volume chamber to study the unstable flame propagation processes of RP-3/air premixed flame at initial pressures of 0.1, 0.2 and 0.3 MPa, initial temperatures of 420, 450 and 480 K and over a wide equivalence ratio range from 1.0 to 1.7. Results show that the RP-3/air premixed flame tends to be unstable with increased equivalence ratio and initial pressure. The measured transition acceleration onset and calculated critical flame radius R cr agree well with each other. The effects of diffusional- thermal, hydrodynamic instability and stretch rate in spherically expanding flames on α show that α of RP-3/air premixed flame strongly depends on effective Lewis number L e eff and Markstein number Ma . With the increase of equivalence ratio, acceleration exponent α tends to increase and the flame radius corresponding to the onset of similarity acceleration decreases.