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Acta Aeronautica et Astronautica Sinica ›› 2026, Vol. 47 ›› Issue (12): 132822.doi: 10.7527/S1000-6893.2025.32822

• Fluid Mechanics and Flight Mechanics • Previous Articles    

Rheological properties of boron-loaded gel fuel

Yujia FENG1, Zhenhua SUN1,2()   

  1. 1.China Airborne Missile Academy,Luoyang 471009,China
    2.National Key Laboratory of Air-Based Information Perception and Fusion,Luoyang 471009,China
  • Received:2025-09-24 Revised:2025-11-17 Accepted:2025-12-30 Online:2026-01-16 Published:2026-01-15
  • Contact: Zhenhua SUN E-mail:rainszh@163.com
  • Supported by:
    “Ye Qisun” Science Fund of National Natural Science Foundation of China(U2341281)

Abstract:

Boron-loaded gel fuel is an ideal propellant for limited-volume propulsion devices such as ramjets. However, its high viscosity and complex rheological properties pose significant challenges to its practical application. In this study, a novel gel fuel with 50wt% boron content was used as the research object. Based on the complex service environments in engineering applications, a series of experiments were designed to investigate the effects of shear rate change rate, constant shear duration, pre-shearing, and temperature on the viscosity of boron-loaded gel fuel. The experimental phenomena were analyzed in depth based on shear stress. The results show that under constant shear rate, the time-dependent viscosity of boron-loaded gel fuel can be accurately described by a power function with a constant term. Pre-shearing can effectively destroy the structure of the boron-loaded gel system and make it difficult to recover within a finite time. High-low temperature cycling can hardly destroy the gel structure but can reduce its structural strength. At a constant shear rate, there exists a critical temperature: below this temperature, the viscosity of the gel fuel is negatively correlated with temperature; above this temperature, the viscosity does not change significantly. Based on shear stress analysis, it is inferred that the boron-loaded gel system has a multi-level structure. Under high-low temperature cycling, the recovery ability of the secondary structure is stronger than that of the main structure.

Key words: boron-loaded gel fuel, non-Newtonian fluid, rheology, viscosity, air breathing engine

CLC Number: