In all cases, mean burning rates can be accurately calculated using an Oseen approximation for the velocity field, rather than solving the Navier-Stokes equations.
A random-packing algorithm is used to construct models of ammonium perchlorate (AP) in hydroxyl-terminated polybutadiene propellants which minic experimental propellants designed by R. Miller, and these are numerically burnt, Mean burning rates are compared with experimental data for four packs, over a pressure range of 7 200 atm.
On the other hand, the apparent activation energy and thickness of the melting layer of triple-base propellants were also increased with the decrease of NQ particle size, which meant that the sensitivities of burning rate to the conditions of gas phase were reduced.
Using this setup, the burning characteristics, spread rate of the flame base, and the solid burning rate were examined.
This term is expressed as the product of an instability enhanced burning rate factor, Pbi, and the mean volumetric heat release rate in an unstretched laminar flamelet of the mixture.
Addition of nitrocellulose (NC) particles to the nanofuel diminishes or fully counteracts the burning rate decreases and provides a means of tuning the burning rate constant higher than that of pure Kerosene (maximum 13.8% increase over control with 2.3 wt% nAl and 0.6 wt% NC added).
Although a smaller bilayer thickness means a much shorter diffusion distance and quicker burning rate, there are more interfaces and it is more likely that the NiO layer and Al layer partially interdiffuse for a much smaller bilayer thickness before the electrical explosion test, which results in a lower energy output and reduction of the burning rate.
Three pools with fuel depth of 6, 12 and 18 mm were examined in terms of overall burning rate, flame height, and cross-sectional maps of mean temperature and in-plane 2-D velocity.
The burning rate generally follows that of multi-component fuels, by some means in terms of a lever rule, whereas the mixture of biodiesel and dodecane exhibits a somewhat nonlinear relation with the added fraction of dodecane.
Finally, the burning rate is determined as a function of the distance between the wall and the mean flame contour and compared to a flame density approach, and similar results are found.
