Enhancement of Hybrid Fuel Regression Rate Using a Bluff Body

Kumar, Rajiv; Ramakrishna, P. A.

doi:10.2514/1.b34975

Cited by 35 publications

(23 citation statements)

References 13 publications

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“…It was observed from Ref. 17 that the use of bluff body increases the regression rate. The results obtained with bluff body are also shown in Figure 6 for 20 % EVA.…”

Section: Regression Rate Studiesmentioning

confidence: 77%

“…To determine the regression rate, the experimental set‐up used is given in Ref. 17 and also explained here for enhanced readability.…”

Section: Regression Rate Studiesmentioning

confidence: 99%

“…The hybrid rocket motor which is shown in Figure 4 has an initial port diameter of 15 mm and nozzle throat diameter of 14 mm, similar to the one used in Refs. 17, 26. It has a bluff body at the head end.…”

Section: Regression Rate Studiesmentioning

confidence: 99%

“…A similar result was reported by us earlier in Ref. 17. This can be clearly understood from Figure 8.…”

Section: Regression Rate Studiesmentioning

confidence: 99%

“…The drawback of such fuel is that the duration of processing is longer and that the overall cost is high. Another approach to enhance the regression rate of hybrid fuel is to control the flow pattern of the oxidizer in the combustion chamber such as radial injection, swirl injection, using a protrusion in the combustion chamber and bluff body at the head end 12–17. Among all these methods, swirl injection was very effective and the regression rate was observed to improve by around 700 % compared to the case without swirl.…”

Section: Introductionmentioning

confidence: 99%

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Studies on EVA‐Based Wax Fuel for Launch Vehicle Applications

Kumar

Ramakrishna

2016

Propellants Explo Pyrotec

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A fuel for the hybrid rocket system was developed. The attempts made to improve the mechanical properties of wax by adding EVA (ethylene vinyl acetate) are illustrated. It was observed that the mechanical properties obtained by adding EVA to wax were dependent on the process of curing the fuel specimen. A proprietary method of curing the fuel specimen was established. The percentage elongation obtained with 20 % EVA and 80 % of wax was around 17 %, which was much higher than the values obtained with pure wax (4 %). It was observed from the study that the higher the percentage of EVA content in wax was, the better the mechanical properties were. Regression rate studies with EVA and wax combination were carried out. It was observed that the regression rate decreased upon addition of EVA in wax. This reduction was compensated by using a bluff body at the head end. The regression rate obtained with 20 % EVA and 80 % wax even with the use of bluff body is lower than that obtained with pure wax, but is around 3.5 times the regression rate obtained with polymeric fuels.

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“…It was observed from Ref. 17 that the use of bluff body increases the regression rate. The results obtained with bluff body are also shown in Figure 6 for 20 % EVA.…”

Section: Regression Rate Studiesmentioning

confidence: 77%

“…To determine the regression rate, the experimental set‐up used is given in Ref. 17 and also explained here for enhanced readability.…”

Section: Regression Rate Studiesmentioning

confidence: 99%

Section: Regression Rate Studiesmentioning

confidence: 99%

“…A similar result was reported by us earlier in Ref. 17. This can be clearly understood from Figure 8.…”

Section: Regression Rate Studiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Studies on EVA‐Based Wax Fuel for Launch Vehicle Applications

Kumar

Ramakrishna

2016

Propellants Explo Pyrotec

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Combustion of Flake Aluminum withPTFEin Solid and Hybrid Rockets *

Marothiya

Ramakrishna

2023

Nano and Micro‐Scale Energetic Materials

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Regression Rate Characterization of HTPB‐Paraffin Based Solid Fuels for Hybrid Rocket

Mahottamananda

Kadiresh

Pal

2020

Propellants Explo Pyrotec

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Hybrid rockets are entitled with unique features such as simplicity, thrust modulation, safety, and low cost compared to that of conventional liquid and solid rockets. Despite their distinct advantages, the polymeric solid fuels exhibit a low regression rate, which limits their potential applications for the various space missions. In this study, pure hydroxyl‐terminated polybutadiene (HTPB), paraffin wax, and blended HTPB‐paraffin solid fuels, namely 80P, 60P, 40P, 25P were characterized for ballistic performance. The viscosity, local regression rate, average regression rate and combustion chamber pressure of solid fuels were evaluated on a lab‐scale ballistic motor. It was found that the viscosity of blended fuels decreased with increasing the paraffin wt. % in the formulation. The local regression rates of blended fuels increased in the range of 0.53 mm/s to 1.58 mm/s at oxidizer mass flux range of 85 kg/m2s to 150 kg/m2s. The results indicate that increasing the wt.% of paraffin in the blend will enhance the average regression rate performance, besides suppressing the low‐pressure oscillations during steady‐state operation.

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Enhancement of Hybrid Fuel Regression Rate Using a Bluff Body

Cited by 35 publications

References 13 publications

Studies on EVA‐Based Wax Fuel for Launch Vehicle Applications

Studies on EVA‐Based Wax Fuel for Launch Vehicle Applications

Combustion of Flake Aluminum withPTFEin Solid and Hybrid Rockets *

Regression Rate Characterization of HTPB‐Paraffin Based Solid Fuels for Hybrid Rocket

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