Burn rate (chemistry)

About: Burn rate (chemistry) is a research topic. Over the lifetime, 847 publications have been published within this topic receiving 8908 citations. The topic is also known as: Burning rate.

Modeling the Burning Rate of Heterogeneous Propellants over a Wide Range of Pressures

Abstract: The variation of steady burning rate for heterogeneous propellants over a wide range of pressure is studied by experimental methods and theoretical analysis. Two kinds of heterogeneous propellants, GATo-1 CMDB propellant and 86 series composite propellant, are selected. An explanation for two inflection points observed in burning rate–pressure curve is presented. It is concluded that condensed-phase reaction dominates the burning process in the low-pressure region, which presents a low-pressure exponent, whereas heat feedback from the gas phase predominates in the high-pressure region with a high-pressure exponent. In the medium-pressure region, these two factors influence the burning process cooperatively and pressure exponent reduces first and then rises. Results calculated from the model show good agreement with experimental data. Thermal parameters analysis indicate burning rate is more sensitive to thermal conductivity of condensed phase, activation energy of condensed phase, specific heat capacity, ...

Energy-driven model for HE initiation and burn

Abstract: A simple 2-state reactive flow HE burn model is described in which an approximate thermal energy is used in place of temperature to drive an Arrhenius-like rate expression. The product volume fraction and the exchange energy are determined by Newton-Raphson iteration under the twin requirements that reactant and product end up in mechanical (P+Q) equilibrium and that energy be rigorously conserved in the zone. The burn fraction is then adjusted by iterating the burn rate calculation. The rate expression is analytically integrable provided the rate coefficients can be taken as constant over a hydro cycle; we assume this to be true. Ignition is represented in two ways: by a void-collapse hot-spot model in porous zones and, in zones that are sufficiently energetic, by a direct-conversion reactant burn model. Neither the reactant nor the product EOS is part of the model prescription. This separates the rate law from the EOS parametrization and frees the user to choose any available EOSs to represent the reactant and product states. In particular, it is possible to model the reactant material with strength, which can be an important capability in threshold situations.

Investigation on measuring gas generation rate for fuel-rich propellant during combustion process

Abstract: The equipment for measuring gas generation rate of fuel-rich propellant was established,and a experimental method was put forwardPickling asbestos and silica glass fiber cloth were used as filter in the testing equipment to realize reliable separation of gas-phase and condense phase combustion productsAnd,a reliable method was put forward by verifying the credible separation between gas and solid/liquidThe pressure change in the course of experiment was testedThe results show that the pressure in combustion chamber can be controlled by adjusting sample shape and consumption as well as the back end lid number,and the measurement of gas generation rate of sample under certain pressure can be realized