The delignified wood-based self-supporting carbon material is an ideal basic interdigital flexible electrode material, which has good application potential.

The content of solid primary products boron-based fuel-rich propellants could be determined quantitatively through the analysis procedure.

Boron-based fuel-rich propellants with different formulation were prepared, and the condensed-phase products under chamber pressures collected in this study. The composition of boride (elemental boron, boron oxide, carbide, nitride) was measured by chemical analysis particle size distribution determined using a laser analyzer. Moreover, burning rate combustion temperature strand burner. experimental results show that both propellant played an important role production boride. There might be...

Abstract NO 2 fission is a vital factor for 1,3,5-Trinitroperhydro-1,3,5-triazine (RDX) and octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine (HMX) decomposition. In this study, the geometry of gas-phase RDX HMX molecules was optimized, bond order dissociation energy N-N bonds were examined. Moreover, rate constants conformers, concerning dissociation, evaluated using microcanonical variational transition state theory ( μ VT). The calculation results have shown that more stable than in terms...

In this paper, the dependences of morphology, particle sizes, and compositions condensed combustion products (CCP) modified double-base propellants (1,3,5-trimethylenetrinitramine (RDX) as oxidizer) on chamber pressure (<35 MPa) nickel inclusion have been evaluated under a practical rocket motor operation. It has shown that higher results in smaller average sizes CCPs. The CCPs Ni-containing more diverse morphologies, including spherical particles, large layered structures, small flakes...

Paraffin fuel has been found to have a regression rate that is higher than conventional HTPB (hydroxyl-terminated polybutadiene) and, thus, presents itself as an ideal energy source for hybrid rocket engine. The characteristics of paraffin-based and calculated by the method minimum free energy. thermal degradation were measured paraffin, pretreated in different working conditions using differential scanning calorimetry (DSC) thermogravimetric analyzer (TGA). rates tested rectangular...

Combustion mechanisms of propellants under high pressures are necessary to solve the problems a burning rate pressure exponent in high-pressure solid rocket motors. In this study, combustion characteristics hydroxyl-terminated polybutadiene (HTPB) were investigated by analyzing rate, quenched surface, and wave up 28 MPa. The results showed that presented an obvious break above 17 MPa, which increased from below 0.4 approximately one. characteristic where occurred decreased 19.00 17.90 MPa...

NO2 fission is regarded to be the most important initial decomposition process of 2,4,6,8,10,12-hexanitro-2,4,6,8,10,12-hexaazaisowurtzitane (CL-20). In this study, four CL-20 conformers based on ε-CL-20 were obtained after optimization at m062x/cc-pvtz level, and bond length, order dissociation energy N-N bonds examined investigate stability these bonds. addition, rate constants activation evaluated using microcanonical variational transition state theory (μVT). The calculation results have...

Hexagonal boron nitride ( h -BN) powders were fabricated by the combustion synthesis with B/KNO 3 /HMX (octogen) mixtures as reactants. X-ray diffraction (XRD) and photoelectron spectroscopy (XPS) adopted to investigate phase composition chemical of products, respectively. The morphology resistance oxidation studied scanning electron microscopy (SEM) thermogravimetry (TGA), characterization results showed that -BN which was produced through this method has high purity exhibits excellent...

In this article, the method of constant volume burner was used to measure solid propellant burning rate under high pressure. The formula and heat loss equation were derived, effects four factors (pressure increasing rate, time, ignition, rate) on during operation carried out. Furthermore, testing reproducibility analyzed. It shown that sample size precision, moles per unit mass propellant, main for accuracy method. shorter faster pressure rate; less loss, appropriate ignition way reduce...

Hydroxyl-terminated polybutadiene (HTPB)/paraffin fuels applied in hybrid rocket motors enjoy high regression rates and excellent mechanical properties; however, the special microscopic structure of leads to more complex droplet entrainment mechanisms. The two-dimensional heterogeneous HTPB/paraffin geometry model was established by a dynamic packing algorithm. Dynamic evolution characteristics liquid film disturbed interaction between HTPB paraffin were investigated numerical calculation,...

In this paper, a series of insensitive smokeless nitrocellulose (NC)-based propellants were prepared through the absorption rolling method. Their thermal stability was rigorously assessed via vacuum test (VST), and their reactivity propellant comprehensively investigated compared using thermogravimetric analysis (TG)/differential scanning calorimetry (DSC) technique. Additionally, combustion characteristics meticulously analyzed by constant-volume diagnosis system. The experimental results...

The effect of mixing on coupled heat release and transfer performance a novel segregated solid motor is numerically evaluated with transient two-dimensional combustion model. results show that vortex structures are formed evolved in the chamber. Quantitative calculation shows inhomogeneous distribution oxidant fuel species. well-mixing area located narrow belt-like region near burning surface propellant. Heat coefficient decreases greatly due to lower reaction rate enlarged flow channel...