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Journal Articles

A One-dimensional propagation of shock wave supported by atmospheric millimeter-wave plasma

Oda, Yasuhisa; Yamaguchi, Toshikazu*; Shiraishi, Yuya*; Komurasaki, Kimiya*; Kajiwara, Ken; Takahashi, Koji; Kasugai, Atsushi; Sakamoto, Keishi

Journal of Infrared, Millimeter, and Terahertz Waves, 32(6), p.877 - 882, 2011/06

 Times Cited Count:8 Percentile:44.5(Engineering, Electrical & Electronic)

Journal Articles

An Experimental study on high power millimeter wave beam transmission for microwave beaming propulsion

Oda, Yasuhisa; Yamaguchi, Toshikazu*; Komurasaki, Kimiya*; Kajiwara, Ken; Takahashi, Koji; Sakamoto, Keishi

Proceedings of IEEE MTT-S International Microwave Workshop Series (IMWS) on Innovative Wireless Power Transmission (IMWS-IWPT 2011), p.181 - 184, 2011/05

Journal Articles

A Thrust generation model of tube body microwave beaming thruster

Oda, Yasuhisa; Sakamoto, Keishi; Komurasaki, Kimiya*

Purazuma Oyo Kagaku, 18(2), p.177 - 181, 2010/12

Journal Articles

In tube shock wave driven by atmospheric millimeter-wave plasma

Oda, Yasuhisa; Kajiwara, Ken; Takahashi, Koji; Kasugai, Atsushi; Sakamoto, Keishi; Komurasaki, Kimiya*

Japanese Journal of Applied Physics, 48(11), p.116001_1 - 116001_4, 2009/11

 Times Cited Count:16 Percentile:55.8(Physics, Applied)

Journal Articles

Thrust performance of a microwave rocket under repetitive-pulse operation

Oda, Yasuhisa; Shibata, Teppei*; Komurasaki, Kimiya*; Takahashi, Koji; Kasugai, Atsushi; Sakamoto, Keishi

Journal of Propulsion and Power, 25(1), p.118 - 122, 2009/01

 Times Cited Count:22 Percentile:81.96(Engineering, Aerospace)

Journal Articles

Shock wave generation using a high power millimeter wave beam

Oda, Yasuhisa; Kajiwara, Ken; Takahashi, Koji; Kasugai, Atsushi; Sakamoto, Keishi; Komurasaki, Kimiya*

Proceedings of Global Congress on Microwave Energy Applications (GCMEA 2008/MAJIC 1st), p.567 - 570, 2008/08

Journal Articles

Dynamics and structure formation of atmospheric microwave breakdown

Oda, Yasuhisa; Komurasaki, Kimiya*; Sakamoto, Keishi

Purazuma, Kaku Yugo Gakkai-Shi, 84(6), p.343 - 347, 2008/06

no abstracts in English

Journal Articles

Plasma generation at atmospheric pressure using a high-power microwave beam and its application to rocket propulsion

Oda, Yasuhisa*; Komurasaki, Kimiya*; Takahashi, Koji; Kasugai, Atsushi; Imai, Tsuyoshi*; Sakamoto, Keishi

Electrical Engineering in Japan, 161(2), p.1 - 7, 2007/11

 Times Cited Count:1 Percentile:11.91(Engineering, Electrical & Electronic)

Experiments on microwave plasma generation and its application to microwave beamed energy propulsion were conducted using a 1 MW-class, 170 GHz gyrotron. The microwave beam was focused using a parabola reflector and plasma was initiated near the focal point in the ambient air. Plasma propagated upstream in the microwave beam channel while absorbing microwaves. Its propagation velocity was supersonic when the microwave power density was greater than 75 kW/cm$$^{2}$$. The propulsive impulse was measured using a cone-cylinder shaped thruster model. As a result, the maximum momentum coupling coefficient was obtained at a certain plasma propagation distance. In addition, a larger momentum coupling coefficient was obtained when plasma was propagated at a supersonic velocity. This is because supersonic plasma propagation forms a strong shock wave, resulting in an efficient pressure increase.

Journal Articles

Atmospheric pressure dependence of the microwave rocket's performance powered by a high power gyrotron

Oda, Yasuhisa*; Komurasaki, Kimiya*; Takahashi, Koji; Kasugai, Atsushi; Sakamoto, Keishi

Purazuma, Kaku Yugo Gakkai-Shi, 83(3), p.296 - 299, 2007/03

no abstracts in English

Journal Articles

Plasma generation using high-power millimeter-wave beam and its application for thrust generation

Oda, Yasuhisa*; Komurasaki, Kimiya*; Takahashi, Koji; Kasugai, Atsushi; Sakamoto, Keishi

Journal of Applied Physics, 100(11), p.113307_1 - 113307_4, 2006/12

 Times Cited Count:65 Percentile:88.16(Physics, Applied)

no abstracts in English

Journal Articles

Plasma generation at atmospheric pressure using a high power microwave beam and its application to rocket propulsion

Oda, Yasuhisa*; Komurasaki, Kimiya*; Takahashi, Koji; Kasugai, Atsushi; Imai, Tsuyoshi*; Sakamoto, Keishi

Denki Gakkai Rombunshi, A, 126(8), p.807 - 812, 2006/08

Experiments on microwave plasma generation and its application to microwave beamed energy propulsion were conducted using a 1MW-class, 170GHz gyrotron. The microwave beam was focused using a parabola reflector and plasma was initiated near the focal point in the ambient air. Plasma propagated upstream in the microwave beam channel while absorbing microwave. Its propagation velocity was supersonic when the microwave power density was larger than 75kW/cm$$^{2}$$. The propulsive impulse was measured using a cone-cylinder shaped thruster model. As a result, maximum momentum coupling coefficient was obtained at a certain plasma propagation distance. In addition, large momentum coupling coefficient was obtained when plasma was propagated at a supersonic velocity. It would be because supersonic plasma propagation forms a strong shock wave, resulting in an efficient pressure increase.

Journal Articles

A Plasma and shockwave observation with pulse repetition in a microwave boosted thruster

Oda, Yasuhisa*; Komurasaki, Kimiya*; Takahashi, Koji; Kasugai, Atsushi; Sakamoto, Keishi

Proceedings of 42nd AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit, 6 Pages, 2006/07

An experiment on microwave beaming propulsion with repetitive pulse was conducted. A millimeter-wave high power gyrotron developed in Japan Atomic Energy Research Institute was used for microwave generator. The velocity of plasma and shock wave propagation was measured. The velocity in the repetitive pulse condition was faster than that in the single pulse condition, and higher velocity was obtained at higher repetition rate due to the hot air remaining in the thruster.

Journal Articles

A Multi pulse experiment of a microwave-beaming thruster

Oda, Yasuhisa*; Komurasaki, Kimiya*; Takahashi, Koji; Kasugai, Atsushi; Sakamoto, Keishi

Proceedings of 25th International Symposium on Space Technology and Science (ISTS-25) (CD-ROM), p.177 - 181, 2006/06

The thrust generation model of a pulse detonation engine (PDE) was applied to a microwave beaming thruster composed of a cylindrical tube, because an ionization front propagates in the tube absorbing microwave power following a shock wave. Total impulsive thrust was estimated by integrating the pressure history at the thrust wall. The thrust for a thruster with the tube length of $$L$$ = 0.18m was 0.16Ns. It was twice as large as that measured in the flight experiment. This discrepancy would be caused during the air-refilling process. Pressure histories under multi pulse operation were also measured at the frequency from 40Hz to 15Hz. The shock velocity and pressure in the thruster changed with the pulse repetition frequency. Although impulsive thrust was decreased with pulse repetition frequency, the decrease in thrust at the frequency lower than 20Hz was allowably small.

Journal Articles

A Thrust generation model of a microwave rocket

Oda, Yasuhisa*; Shibata, Teppei*; Komurasaki, Kimiya*; Takahashi, Koji; Kasugai, Atsushi; Sakamoto, Keishi

Journal of Space Technology and Science, 22(2), p.30 - 37, 2006/00

A thrust generation model for microwave rocket was studied. The model was based on shock wave propagation driven by atmospheric plasma as analogy of pulse detonation engine (PDE). Pressure histories in the thruster were measured using pressure gauges and compared to the model. The shock wave was measured from pressure history in the thruster model. The relationship between the shock-wave traveling time and propagation distance showed good linearity. At the same time, the propagation velocity of the ionization front in the tube was also measured. The velocity is also nearly constant during the propagation. The both velocities were increased with the power density. The both the ionization front and the shock wave propagated at the same velocity when they propagated at supersonic speed. Thrust impulse was estimated from pressure history. Estimated thrust showed good agreement to the result of the flight experiment.

Journal Articles

A Multi pulse flight experiment of a microwave beaming thruster

Oda, Yasuhisa*; Ushio, Masato*; Komurasaki, Kimiya*; Takahashi, Koji; Kasugai, Atsushi; Sakamoto, Keishi

AIP Conference Proceedings 766, p.297 - 302, 2005/04

no abstracts in English

Journal Articles

Plasma generation using high power microwave and application of space propulsion

Oda, Yasuhisa*; Komurasaki, Kimiya*; Takahashi, Koji; Kasugai, Atsushi; Sakamoto, Keishi

Denki Gakkai Kenkyukai Shiryo, Genshiryoku Kenkyukai (NE-04-11$$sim$$15), p.19 - 22, 2004/09

no abstracts in English

Journal Articles

Propulsive Impulse Measurement of a Microwave-Boosted Vehicle in the Atmosphere

Nakagawa, Tatsuo*; Mihara, Yorichika*; Komurasaki, Kimiya*; Takahashi, Koji; Sakamoto, Keishi; Imai, Tsuyoshi

Journal of Spacecraft and Rockets, 41(1), p.151 - 153, 2004/02

 Times Cited Count:39 Percentile:88.4(Engineering, Aerospace)

A launching experiment of a microwave-boosted vehicle model was carried out using the 110GHz, 1MW gyrotoron and a propulsive inpulse to lift up the vehicle was measured. The rf power and pulse was 1MW and 0.175 $$sim$$ 0.8msec. The launching mechanism is as follows. Plasma is produced in the nozzle of the vehicle model when the rf beam is injected toward it. The plasma heated by the rf beam can produce a shock wave that gives a propulsive impulse to the vehicle. Maximum momentum coupling coefficient from the impulse to the vehicle is 395N/MW which is comparable to that of a laser boosted vehicle. The rf pulse was 0.175msec. The coupling coefficient is limitted by the gyrtron operation in pulse length and can increase if the pulse length is shorter than 0.175msec.

Journal Articles

Flight test of microwave beaming propulsion using 1MW class gyrotoron

Oda, Yasuhisa*; Nakagawa, Tatsuo*; Matsui, Makoto*; Komurasaki, Kimiya*; Takahashi, Koji; Sakamoto, Keishi; Imai, Tsuyoshi

Dai-47-Kai Uchu Kagaku Gijutsu Rengo Koenkai Koenshu (CD-ROM), p.1067 - 1069, 2003/00

no abstracts in English

Journal Articles

Fundamental experiments of Microwave thruster

Matsui, Makoto*; Mihara, Yorichika*; Nakagawa, Tatsuo*; Mori, Koichi*; Komurasaki, Kimiya*; Takahashi, Koji; Sakamoto, Keishi; Imai, Tsuyoshi

Uchu Yuso Shimpojiumu (Heisei-14-Nendo) Koenshu, p.300 - 303, 2003/00

no abstracts in English

Oral presentation

Thrust generation model based on detonation wave propagation in microwave beaming thruster

Oda, Yasuhisa*; Kawamura, Koichi*; Komurasaki, Kimiya*; Takahashi, Koji; Kasugai, Atsushi; Sakamoto, Keishi

no journal, , 

no abstracts in English

50 (Records 1-20 displayed on this page)