Enhancement of Fuel Regression Rate for Hybrid Rockets by Introducing Novel Coaxial Tube Injector

Kahraman, Mehmet; Özkol, İbrahim; Karabeyoğlu, Arif

doi:10.2514/6.2020-3733

Cited by 2 publications

(1 citation statement)

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“…Even so, the regression rate distribution along the axis of the fuel grain was extremely uneven and erosion was observed near the injection site [28]. Kahraman et al [29] reported the construction of a distributed tube injector (DTI) installed along the center axis of the combustion chamber to provide radial injection of the oxidizer. This DTI unit provided more uniform injection of oxidizer along the axial direction and resulted in a considerable increase in the regression rate.…”

Section: Introductionmentioning

confidence: 99%

Combustion Characteristics of a Swirl-Radial-Injection Composite Fuel Grain with Applications in Hybrid Rockets

Wang,

Lin,

Wang

et al. 2023

Aerospace

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The combustion characteristics of a swirl-radial-injection composite fuel grain were experimentally and numerically investigated. This composite grain permits swirl-radial oxidizer injection based on three hollow helical blades, each having a constant hollow space allowing uniform oxidizer injection into the main chamber along the axial direction. The oxidizer enters from channel inlets located along a hollow outer wall. This wall, together with the three blades, is fabricated as one piece from acrylonitrile-butadiene-styrene using three-dimensional printing. Paraffin-based fuel is embedded in the spaces between adjacent blades. Firing tests were conducted with gaseous oxygen as the oxidizer, using oxidizer mass flow rates ranging from 7.45 to 30.68 g/s. Paraffin-based fuel grains using conventional fore-end injection were used for comparison. Regression rate boundaries were determined taking into account the erosion of the oxidizer channels. The data show that the regression rate was significantly increased even at the lower limit. Images of the combustion chamber flame and of the exhaust plume were also acquired. The flame was found to be concentrated in the main chamber and a smoky plume was observed, consistent with the high regression rate. A three-dimensional simulation was employed. The present design was found to improve fuel/oxidizer mixing and combustion efficiency compared with a fuel grain using fore-end injection. Both the experimental results and numerical simulations confirmed the potential of this swirl-radial-injection fuel grain.

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Section: Introductionmentioning

confidence: 99%