Topic
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.
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01 Mar 1974
TL;DR: In this article, the authors investigate the complex coupling between the chamber flow conditions and the solid propellant combustion process, which may lead to large amplitude longitudinal instabilities, leading to increased mean chamber pressure and burning rate, excessive heat transfer rates, and a severe vibration level.
Abstract: : Nonlinear axial-mode combustion instability remains a serious problem in the development of solid propellant rocket motors. Although the use of metal- loaded solid propellants which produce solid particles in the flow has reduced the occurrence of high frequency instabilities, it has not eliminated the axial-mode intermediate frequency (100 - 1000 Hz.) problem. If such an instability reaches a large amplitude limit cycle, it may lead to an increase in mean chamber pressure and burning rate, excessive heat transfer rates, and a severe vibration level. The objective of this report is to investigate the complex coupling between the chamber flow conditions and the solid propellant combustion process which may lead to large amplitude longitudinal instabilities.
7 citations
01 Aug 1993
TL;DR: In this article, an optical absorption experiment coupled to a windowed strand burner has been used to obtain dark zone temperatures and nitric oxide concentrations for two nitramine propellants (M43 and XM39) and a single base propellant (M10).
Abstract: : An optical absorption experiment coupled to a windowed strand burner has been used to obtain dark zone temperatures and nitric oxide concentrations for two nitramine propellants (M43 and XM39) and a single base propellant (M10). Moreover, burn rates as a function of pressure were determined from the video record of the propellant burns. These measurements were taken over a pressure range from 0.8 to 2 MPa.... Burning rate, Optical absorption, Propellant combustion, Solid propellants
7 citations
04 Jan 2010
TL;DR: In this article, the authors examined the combustion response of homogeneous and heterogeneous solid propellants to an imposed velocity field, as a model for erosive burning, and showed that for certain realistic choices of the parameters both positive and negative erosion can take place.
Abstract: We examine the combustion response of homogeneous and heterogeneous solid propellants to an imposed velocity field, as a model for erosive burning. The imposed velocity field has its roots in a multiscale analysis of a solid rocket motor. For homogeneous solid propellants we show that for certain realistic choices of the parameters both positive and negative erosion can take place. The underlying mechanism for erosive burning is flame stretch. For heterogeneous solid propellants we show enhancement of the burn rate as a function crossflow velocity, and that this increase is also a function of propellant morphology and pressure.
7 citations
TL;DR: In this article, a mathematical model that describes thermo-mechanical deformations and thermal gradients on the unsteady burning of a heterogeneous solid propellant is presented.
7 citations
20 Aug 2009
TL;DR: In this article, a combined physical-statistical control-oriented model is developed to predict the distribution of HCCI combustion timing (CA50, crank angle of 50% fuel mass fraction burnt) for a range of operating conditions.
Abstract: Control of Homogeneous Charge Compression Ignition (HCCI) engines to obtain the desirable operation requires understanding of how different charge variables influence the cyclic variations in HCCI combustion. Combustion timing for consecutive cycles at each operating point makes an ensemble of combustion timing which can exhibit different shapes of probability distributions depending on the random and physical patterns existing in the data. In this paper, a combined physical-statistical control-oriented model is developed to predict the distribution of HCCI combustion timing (CA50, crank angle of 50% fuel mass fraction burnt) for a range of operating conditions. The statistical model is based on the Generalized Extreme Value (GEV) distribution and the physical model embodies a modified knock integral model, a fuel burn rate model, a semi-empirical model for the gas exchange process and an empirical model to estimate the combustion timing dispersion. The resulting model is parameterized for the combustion of Primary Reference Fuel (PRF) blends using over 5000 simulations from a detailed thermo-kinetic model. Empirical correlations in the model are parameterized using the experimental data obtained from a single-cylinder engine. Once the model is parameterized it only needs five inputs: intake pressure, intake temperature, Exhaust Gas Recirculation (EGR) rate, equivalence ratio and engine speed. The main outputs of the model are CA50 and the Probability Density Function (PDF) metrics of CA50 distribution. Experimental CA50 is compared with predicted CA50 from the model and the results show a total average error of less than 1.5 degrees of crank angle for 213 steady-state operating points with four different PRF fuels at diversified operating conditions. Predicted PDF of the CA50 ensemble is compared with that of the experiments for PRF fuels at different running conditions. The results indicate a good agreement between simulation and the experiment.Copyright © 2009 by ASME
7 citations