A Preliminary Study of the Wet Towel Hybrid Rocket Motor.

Nagata, Harunori; Akiba, R.; Tanatsugu, Nobuhiro; Kohno, Masahiro; Yokota, Rikio; Kayuta, Seiyu

doi:10.2322/jjsass1969.45.365

Cited by 1 publication

(5 citation statements)

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“…As the results mentioned above, we could successfully obtain those fundamental burning characteristics of the tested specimen, such as the pressure dependency and the fuel porosity on the steadiness, the burning behavior, and the overall burning rate, which the data has been missed since the previous work by Nagata et al (1997). In this work, it made us Matsugi, Hasebe, Yamazaki, Matsuoka and Nakamura, Journal of Thermal Science and Technology, Vol.16, No.3 (2021) possible to develop the simple experimental setup to investigate those burning characteristics by adopting hydrogen peroxide (not LOX).…”

Section: Effect Of Fuel Porosity and Pressure On Overall Burning Ratementioning

confidence: 92%

“…In the previous work by Nagata et al (1997), although the high burning rates were successfully achieved, large data scattering of the burning rates was often observed at random pressure environments even in a standard pressure environment (0.1 MPa). In addition, the experimental data was limited to only the signals from the three TCs embedded, allowing them only to measure just an "average" burning rate.…”

Section: Introductionmentioning

confidence: 95%

“…Furthermore, ammonium perchlorate behaves as an explosive (Essel et al, 2019), so that it is carefully handled to ensure our safety from explosion and its toxicity (Aggarwal et al, 2015). For aforementioned reasons, many research groups have been exploring an alternative green propellant, such as hybrid rocket propellants and AP-free solid propellants, to replace into the AP-based propellant (e.g., Nagata et al, 1997;Sabourin et al, 2008;Sundaram et al, 2014;Sinditskii and Egorshev, 2008;Abd-Elghany et al, 2018). Nevertheless, upgrading these green propellants is no doubt challenging.…”

Section: Introductionmentioning

confidence: 99%

“…One of the promising candidates for the green propellant is to employ a well-mixing propellant consisting of a porous Matsugi, Hasebe, Yamazaki, Matsuoka and Nakamura, Journal of Thermal Science and Technology, Vol.16, No.3 (2021) combustible (polymeric material or metal particles group) well-soaked in liquid oxidizer (e.g., Nagata et al, 1997;Sabourin et al, 2008;Sundaram et al, 2014), featuring a large specific surface-volume ratio (S/V). The heat and mass transfer rate shall be, thus, intensified by means of the propellant.…”

Section: Introductionmentioning

confidence: 99%

“…The heat and mass transfer rate shall be, thus, intensified by means of the propellant. Based on this concept, Nagata et al (1997) carried out a series of experiments in a large volume chamber and in a nitrogen environment with a 50 mm-long specimen consisting of fibrous polyamide (the porous combustible) soaked in liquid oxygen (LOX) with a controlled pressure environment (Nagata et al, 1997). They measured burning rates by signals from three thermocouples (TCs) embedded into the specimen and obtained a maximum burning rate at the rate of 20 mm/s, which corresponds to about 24 kg/(m 2 •s) and two-times higher than that of the AP-based propellants in terms of total mass flux (Sutton and Biblarz, 2017).…”

Section: Introductionmentioning

confidence: 99%

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Experimental investigation of burning characteristics of porous combustible soaked in liquid oxidizer

Matsugi

Hasebe

Yamazaki

et al. 2021

JTST

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Experimental investigations of burning characteristics of a tested specimen consisting of a polyethylene foam soaked in 100 wt% hydrogen peroxide are made. All experiments are carried out in a large volume chamber, which newly introduced in our previous work at an initial pressure range from p = 0.1 to p = 0.35 MPa in absolute with various fuel porosity range from ε = 0.6 to ε = 0.9, which corresponds to global equivalence ratios from ϕ = 0.51 to ϕ = 3.8. Temperature measurements using an R-type thermocouple embedded into the specimen are then conducted to investigate thermal structure (e.g., profiles of temperature and temperature gradients and burning surface temperature) of the burning specimen for deep understandings of the burning process. Following forced ignition at top surface of the specimen, steady successive-burning process is successfully observed for all conditions studied in this work. Burning rates (a rate at which the top surface moves downward) are measured by carefully tracking the top surface of the specimen by adopting an image processing software. Findings show that overall burning rates at the rate from 1 to 3.2 mm/s are obtained and influenced by pressure and the fuel porosity. Additionally, results of the direct temperature measurements reveal that the temperature gradient in the gas-phase layer near the top surface (burning surface) of the specimen increases as pressure increases, resulting in an increase in the overall burning rate. The top surface temperature and its pressure dependency, and a global activation energy at the top surface temperature of the specimen are experimentally measured accordingly.

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Section: Effect Of Fuel Porosity and Pressure On Overall Burning Ratementioning

confidence: 92%

Section: Introductionmentioning

confidence: 95%