TY - JOUR
T1 - Investigation of axial-injection end-burning hybrid rocket motor regression
AU - Saito, Yuji
AU - Yokoi, Toshiki
AU - Neumann, Lukas
AU - Yasukochi, Hiroyuki
AU - Soeda, Kentaro
AU - Totani, Tsuyoshi
AU - Wakita, Masashi
AU - Nagata, Harunori
N1 - Publisher Copyright:
© 2017 Techno-Press, Ltd.
Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2017/5/1
Y1 - 2017/5/1
N2 - The axial-injection end-burning hybrid rocket proposed twenty years ago by the authors recently recaptured the attention of researchers for its virtues such as no ξ (oxidizer to fuel mass ratio) shift during firing and good throttling characteristics. This paper is the first report verifying these virtues using a laboratory scale motor. There are several requirements for realizing this type of hybrid rocket: 1) high fuel filling rate for obtaining an optimal ξ 2) small port intervals for increasing port merging rate; 3) ports arrayed across the entire fuel section. Because these requirements could not be satisfied by common manufacturing methods, no previous researchers have conducted experiments with this kind of hybrid rocket. Recent advances in high accuracy 3D printing now allow for fuel to be produced that meets these three requirements. The fuel grains used in this study were produced by a high precision light polymerized 3D printer. Each grain consisted of an array of 0.3 mm diameter ports for a fuel filling rate of 98% .The authors conducted several firing tests with various oxidizer mass flow rates and chamber pressures, and analysed the results, including ξ history, using a new reconstruction technique. The results show that ξ remains almost constant throughout tests of varying oxidizer mass flow rates, and that regression rate in the axial direction is a nearly linear function of chamber pressure with a pressure exponent of 0.996.
AB - The axial-injection end-burning hybrid rocket proposed twenty years ago by the authors recently recaptured the attention of researchers for its virtues such as no ξ (oxidizer to fuel mass ratio) shift during firing and good throttling characteristics. This paper is the first report verifying these virtues using a laboratory scale motor. There are several requirements for realizing this type of hybrid rocket: 1) high fuel filling rate for obtaining an optimal ξ 2) small port intervals for increasing port merging rate; 3) ports arrayed across the entire fuel section. Because these requirements could not be satisfied by common manufacturing methods, no previous researchers have conducted experiments with this kind of hybrid rocket. Recent advances in high accuracy 3D printing now allow for fuel to be produced that meets these three requirements. The fuel grains used in this study were produced by a high precision light polymerized 3D printer. Each grain consisted of an array of 0.3 mm diameter ports for a fuel filling rate of 98% .The authors conducted several firing tests with various oxidizer mass flow rates and chamber pressures, and analysed the results, including ξ history, using a new reconstruction technique. The results show that ξ remains almost constant throughout tests of varying oxidizer mass flow rates, and that regression rate in the axial direction is a nearly linear function of chamber pressure with a pressure exponent of 0.996.
KW - Hybrid rockets
KW - Regression characteristics
KW - Stabilized combustion
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U2 - 10.12989/aas.2017.4.3.281
DO - 10.12989/aas.2017.4.3.281
M3 - Article
AN - SCOPUS:85027314387
VL - 4
SP - 281
EP - 296
JO - Advances in Aircraft and Spacecraft Science
JF - Advances in Aircraft and Spacecraft Science
SN - 2287-528X
IS - 3
ER -