Can One Control Ignition of a Binary-Fuel Spray?
Evaporation and ignition of a binary-fuel cluster of drops is described by models under the.
Binary-Fuel Spray↗
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External Cluster Combustion of Binary-Fuel Drops
A model describing external sheet combustion of a cluster of drops has been developed for clusters of binary-fuel drops.
sheet↗
A model of the evaporation of binary-fuel clusters of drops
A formulation has been developed to describe the evaporation of dense or dilute clusters of binary-fuel drops. The binary fuel is assumed to be made of a solute and a solvent whose volatility is much lower than that of the solute. Convective flow effects, inducing a circulatory motion inside the drops, are taken into account, as well as turbulence external to the cluster volume. Results obtained with this model show that, similar to the conclusions for single isolated drops, the evaporation of the volatile is controlled by liquid mass diffusion when the cluster is dilute. In contrast, when the cluster is dense, the evaporation of the volatile is controlled by surface layer stripping, that is, by the regression rate of the drop, which is in fact controlled by the evaporation rate of the solvent. These conclusions are in agreement with existing experimental observations. Parametric studies show that these conclusions remain valid with changes in ambient temperature, initial slip velocity between drops and gas, initial drop size, initial cluster size, initial liquid mass fraction of the solute, and various combinations of solvent and solute. The implications of these results for computationally intensive combustor calculations are discussed.
Harstad, K.↗
Cluster Combustion of Binary-Fuel Drops
Most fuels used in practical combustion liquid-fuel sprays devices are blends of several components. In many cases, the composition of the fuel is considered critical for the operation of the device due to efficiency and pollution production considerations. This investiga- tion focuses on cluster flames for binary-fuel drops. Studied are spherical clusters of relatively cold drops exposed to an axial flow.
cluster flames liquid-fuel sprays spray systems co↗
Droplet Cluster Behavior in Dense and Dilute Regions of a Spray
A review is presented of modeling work relevant to evaporation and combustion in liquid rocket engine chamber. Highlights of models describing evaporation, ignition, and combustion of clusters of binary-fuel drops are discussed along with strategies for using these models to construct a model of a liquid rocket combustion chamber.
rockets combustion droplets↗