Approaches to Low Fuel Regression Rate in Hybrid Rocket Engines
TLDR
In this article, two approaches (multiport grain and high mixture ratio) are presented to improve the low fuel regression rate of hybrid rocket engines, which aim at reducing negative effects without enhancing regression rate.Abstract:
Hybrid rocket engines are promising propulsion systems which present appealing features such as safety, low cost, and environmental friendliness. On the other hand, certain issues hamper the development hoped for. The present paper discusses approaches addressing improvements to one of the most important among these issues: low fuel regression rate. To highlight the consequence of such an issue and to better understand the concepts proposed, fundamentals are summarized. Two approaches are presented (multiport grain and high mixture ratio) which aim at reducing negative effects without enhancing regression rate. Furthermore, fuel material changes and nonconventional geometries of grain and/or injector are presented as methods to increase fuel regression rate. Although most of these approaches are still at the laboratory or concept scale, many of them are promising.read more
Citations
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A Study on the Regression Rate of Paraffin-based Hybrid Rocket Fuels
TL;DR: In this article, the authors investigated the relation between the regression rates and viscosities of some paraffin-based fuels experimentally and observed the burning surface of fuels with the visualized chamber to reveal the high regression rate mechanism.
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Paraffin-based hybrid rocket engines applications: A review and a market perspective
TL;DR: In this article, a review of hybrid rocket engines state of the art was performed, together with a detailed analysis of the possible applications of such a technology, taking into account the needs of industrial applications of this technology.
Journal ArticleDOI
High Regression Rate Hybrid Rocket Fuel Grains with Helical Port Structures
TL;DR: In this article, the authors used additive manufacturing methods to fabricate hybrid rocket fuel grains with embedded helical ports, which showed significant increases in fuel regression rates and these increases diminished with time as the helical fuel port burns to become progressively more cylindrical.
Journal ArticleDOI
A review of the performance and structural considerations of paraffin wax hybrid rocket fuels with additives
TL;DR: A review of existing regression rate measurement techniques on paraffin wax based fuels and the results obtained with various additives are collated and discussed in this paper as mentioned in this paper, including 2D slab motors that enable visualisation of liquefying fuel droplet entrainment and the effect of an increased viscosity on the droplet encoder mechanism, which can occur with the addition of structural enhancing polymers.
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Optimization of Hybrid Upper-Stage Motor with Coupled Evolutionary/Indirect Procedure
TL;DR: In this article, a cooperative evolutionary method nested with an indirect approach is presented to perform the coupled optimization of hybrid rocket motor and trajectory for an upper stage, and a mission profile based on the Vega launcher is considered and the performance index is the payload inserted into the final orbit.
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