Hikaru Eguchi

Space Flight of Liquid Rotating Detonation Engine Using Sounding Rocket S-520-34

Tomoki Sato, Ken Matsuoka, Noboru Itouyama, Koichi Matsuyama et autres

One of the most important goals in aerospace engineering applications is the creation of new “flyable” systems. In a flight demonstration using the sounding rocket S-520-34, we show the first successful operation of a bipropellant cylindrical rotating detonation engine using liquid ethanol …

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Intelligibility of locally scrambled mosaic speech

Kazuo Ueda, Hikaru Eguchi, Gerard B. Remijn, Yoshitaka Nakajima

It has been well-known that locally time-reversed speech of meaningful sentences is perfectly intelligible when the segment duration is shorter than or equal to 40 ms. However, how the auditory system can use temporally displaced speech cues with degraded amplitude envelopes has …

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Flight Demonstration of Detonation Engine System Using Sounding Rocket S-520-34: Performance of Rotating Detonation Engine Using Liquid Propellants

Tomoki Sato, Ken Matsuoka, Noboru Itouyama, Koichi Matsuyama et autres

One of the most important aspects of aerospace engineering applications is to create new “flyable” systems. We plan to demonstrate Detonation Engine System2 (DES2) operation using liquid propellants in the space environment for the first time, using the sounding rocket S-520-34. A …

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Experimental Parameter Identification and an Evaluation of the Impact of Tire Models on the Dynamics of Fixed-Wing Unmanned Aerial Vehicles

Hikaru Eguchi, Daisuke Nakata

Because fixed-wing unmanned aerial vehicles (UAVs) require high-speed taxiing for takeoff and landing, the aircraft’s stability during taxiing is critical. However, despite research on the taxiing stability of fixed-wing UAVs conducted in taxiing motion simulations employing various tire models, the applicability of …

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Nitrous Oxide/Ethanol Cylindrical Rotating Detonation Engine for Sounding Rocket Space Flight

Kazuki Ishihara, Tomoki Sato, T. Kimura, Kosuke Nakajima et autres

There are few experimental studies on rotating detonation engines (RDEs) with liquid propellants. This study reveals the static thrust performance of a cylindrical RDE with ethanol and liquid nitrous oxide as propellants under atmospheric pressure. This RDE had an inner diameter of …

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Combustion Structure of a Cylindrical Rotating Detonation Engine with Liquid Ethanol and Nitrous Oxide

Tomoki Sato, Kotaro Nakata, Kazuki Ishihara, Noboru Itouyama et autres

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Operating Characteristics of Cylindrical Rotating Detonation Engines Using Liquid Ethanol and Liquid Nitrous Oxide

Tomoki Sato, Kotaro Nakata, Satoru Sawada, Yamato Suzuki et autres

Rotating detonation engine (RDE) is one of the combustors using detonation waves and is expected to simplify the system and improve thermal efficiency due to their supersonic combustion and compression performance by shock waves. Liquid propellants are commonly used in rocket engines …

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Overview for the research and development of Rotating Detonation Engine Systems using a liquid-liquid propellant combination

Noboru Itouyama, Koichi Matsuyama, Ken Matsuoka, Tomoki Sato et autres

Rotating detonation engines (RDEs) exert various characteristics and high propulsion performance depending on their operation mode. Our group has already demonstrated the RDE equipped with gas ethylene and gas oxygen in an outer-space environment using a sounding rocket. For the next step …

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A Bread Board Model Testing for In-Space Flight Demonstration of a Liquid-Propellant Detonation Engine System

Akira Kawasaki, Kotaro Nakata, Tomoki Sato, Satoru Sawada et autres

In-space flight demonstration of a rotating detonation engine system using liquid nitrous oxygen and liquid ethanol as the propellant (DES-2) is planned in FY2024 by a collaborative research group of Nagoya University, Shizuoka University, Keio University, the Muroran Institute of Technology, and …

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Flow-Pattern Identification and Pressure-Drop Measurement in a Self-pressurized Flow of Nitrous Oxide

T. Tada, Kazuki Yasuda, Hikaru Eguchi, Masaharu UCHIUMI et autres

This paper discusses the flow characteristics of nitrous oxide, which is widely used as a self-pressurizing oxidant in small rocket engines, especially focusing on a pressure drop model.In a feed line with a tank pressure of 2.5-5.0MPa, a flow rate of 200-550 …

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The common limitations in auditory temporal processing for Mandarin Chinese and Japanese

Hikaru Eguchi, Kazuo Ueda, Gerard B. Remijn, Yoshitaka Nakajima et autres

The present investigation focused on how temporal degradation affected intelligibility in two types of languages, i.e., a tonal language (Mandarin Chinese) and a non-tonal language (Japanese). The temporal resolution of common daily-life sentences spoken by native speakers was systematically degraded with mosaicking …

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Skid Mobility System to Travel on Planetary Surface for a Small Lander

Hikaru Eguchi, Yusuke Maru, Taro Kawano, Masatsugu Otsuki et autres