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Effect of secondary flow and secondary reactions on pyrolysis and heat transfer of supercritical hydrocarbon aviation fuel in a U-bend tube

Author

Listed:
  • Han, Hongbo
  • Wang, Renting
  • Bao, Zewei

Abstract

The regenerative cooling channels generally consists of straight channel sections and curved sections for the scramjet engines. In this study, pyrolysis and heat transfer of supercritical hydrocarbon aviation fuel HF-1 in a U-bend tube (UBT) were numerically simulated. Discussion was held regarding how the secondary flow and secondary reactions affected the temperature distribution, heat transfer and pyrolysis. Results indicated that the secondary reactions have obvious effects on temperature distribution and pyrolysis at high pyrolysis conversion rate. Besides, the temperature stratification in the UBT is obvious. The existence of secondary flow inside the bending section of the UBT increases non-uniformity of HF-1 mass fraction distribution inside the cross sections. Compared with a straight tube (ST), the radial distribution of DamkÖhler number (Da) inside the cross-section of the UBT is asymmetrical, while Da near the inner side of the UBT is larger. When the r increases from −1 to 0, Da in the ST decreases from 24.4 to 0.3 while Da in the UBT decreases from 102.4 to 0.46. Therefore, the flow of HF-1 has a diminishing effect on the pyrolysis from the main flow area to the inner side wall to a larger extent.

Suggested Citation

  • Han, Hongbo & Wang, Renting & Bao, Zewei, 2024. "Effect of secondary flow and secondary reactions on pyrolysis and heat transfer of supercritical hydrocarbon aviation fuel in a U-bend tube," Energy, Elsevier, vol. 292(C).
    • Handle: RePEc:eee:energy:v:292:y:2024:i:c:s0360544224002895
    DOI: 10.1016/j.energy.2024.130518
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