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3. 低密度ガスによる高温ジェット音響場の再現とエジェクタノズル性能調査への応用

Author

GONZALEZ, Palencia Juan C., ONO, Takahiro, IMAGAWA, Kei, ARAKI, Mikiya, KOJIMA, Takayuki, TAGUCHI, Hideyuki, and SHIGA, Seiichi

Abstract

令和元年度宇宙輸送シンポジウム（2020年1月16日-17日. 宇宙航空研究開発機構宇宙科学研究所（JAXA)(ISAS)）, 相模原市, 神奈川県, Space Transportation Symposium FY2019 (January 16-17, 2020. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS)), Sagamihara, Kanagawa Japan, 資料番号: SA6000147023, レポート番号: STCP-2019-023

Published
2020

5. 矩形エジェクタノズル形状がジェット騒音低減に及ぼす効果

Author

Gonzalez, Palencia Juan C., Fukashiro, Yuki, Masuda, Shoko, Araki, Mikiya, Kojima, Takayuki, Taguchi, Hideyuki, and Shiga, Seiichi

Abstract

平成29年度宇宙輸送シンポジウム（2018年1月18日-19日. 宇宙航空研究開発機構宇宙科学研究所（JAXA)(ISAS)）, 相模原市, 神奈川県, Space Transportation Symposium FY2017 (January 18-19, 2018. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS)), Sagamihara, Kanagawa Japan, 資料番号: SA6000210030, レポート番号: STCP-2017-030

Published
2018

6. 超音速ジェットにおける大規模乱流構造騒音放射機構の調査

Author

Gonzalez, Palencia Juan C., Kuwazoe, Yuto, Araki, Mikiya, Kojima, Takayuki, Taguchi, Hideyuki, and Shiga, Seiichi

Abstract

平成29年度宇宙輸送シンポジウム（2018年1月18日-19日. 宇宙航空研究開発機構宇宙科学研究所（JAXA)(ISAS)）, 相模原市, 神奈川県, Space Transportation Symposium FY2017 (January 18-19, 2018. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS)), Sagamihara, Kanagawa Japan, 資料番号: SA6000210031, レポート番号: STCP-2017-031

Published
2018

8. 矩形エジェクタノズルが超音速噴流の騒音放射特性に及ぼす影響

Author

Masuda, Shoko, Ide, Katsunobu, Araki, Mikiya, Kojima, Takayuki, Taguchi, Hideyuki, Gonzalez-Palencia, Juan-Carlos, and Shiga, Seiichi

Abstract

平成28年度宇宙輸送シンポジウム（2017年1月19日-20日. 宇宙航空研究開発機構宇宙科学研究所（JAXA)(ISAS)）, 相模原市, 神奈川県, Space Transportation Symposium FY2016 (January 19-20, 2017. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS)), Sagamihara, Kanagawa Japan, 資料番号: SA6000086030, レポート番号: STCP-2016-030

Published
2017

9. Visualization of Acoustic Wave emission in a Rectangular Supersonic Jet

Author

Kunishi, Kengo, Kuwazoe, Yuto, Araki, Mikiya, Kojima, Takayuki, Taguchi, Hideyuki, Gonzalez-Palencia, Juan-Carlos, and Shiga, Seiichi

Abstract

平成28年度宇宙輸送シンポジウム（2017年1月19日-20日. 宇宙航空研究開発機構宇宙科学研究所（JAXA)(ISAS)）, 相模原市, 神奈川県, Space Transportation Symposium FY2016 (January 19-20, 2017. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS)), Sagamihara, Kanagawa Japan, 資料番号: SA6000086031, レポート番号: STCP-2016-031

Published
2017

11. 超音速ジェット騒音の音源位置と周波数特性

Author

Araki, Mikiya, Kojima, Takayuki, Taguchi, Hideyuki, Gonzalez, Palencia Juan C., and Shiga, Seiichi

Abstract

平成27年度宇宙輸送シンポジウム（2016年1月14日-15日. 宇宙航空研究開発機構宇宙科学研究所（JAXA)(ISAS)）, 相模原市, 神奈川県, Space Transportation Symposium FY2015 (January 14-15, 2016. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS)), Sagamihara, Kanagawa Japan, 資料番号: SA6000050043, レポート番号: STCP-2015-044

Published
2016

12. 矩形エジェクタノズルから噴出する超音速噴流の騒音放射特性

Author

Araki, Mikiya, Kojima, Takayuki, Taguchi, Hideyuki, Gonzalez, Palencia Juan C., and Shiga, Seiichi

Abstract

平成27年度宇宙輸送シンポジウム（2016年1月14日-15日. 宇宙航空研究開発機構宇宙科学研究所（JAXA)(ISAS)）, 相模原市, 神奈川県, Space Transportation Symposium FY2015 (January 14-15, 2016. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS)), Sagamihara, Kanagawa Japan, 資料番号: SA6000050045, レポート番号: STCP-2015-046

Published
2016

17. Takeoff Noise Estimation of a Hypersonic Aircraft Equipped with the Precooled Turbojet Engine

Author

Sano, Norihisa, Tanaka, Kyohei, Kojima, Takayuki, Taguchi, Hideyuki, Gonzalez, Palencia Juan C., Araki, Mikiya, and Shiga, Seiichi

Abstract

平成26年度宇宙輸送シンポジウム（2015年1月15日-16日. 宇宙航空研究開発機構宇宙科学研究所（JAXA)(ISAS)）, 相模原市, 神奈川県, Space Transportation Symposium FY2014 (January 15-16, 2015. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS)), Sagamihara, Kanagawa Japan, 資料番号: SA6000036023, レポート番号: STCP-2014-023

Published
2015

18. Vegetable Oils as Diesel Fuel Alternatives

Author

Shiga Seiichi and H.T.C. Machacon

Subjects
Spray characteristics, Engineering, Biodiesel, Waste management, business.industry, Winter diesel fuel, Renewable fuels, Combustion, Diesel fuel, chemistry.chemical_compound, chemistry, Biofuel, Petroleum, business
Abstract

Biomass fuels or Biodiesel fuels are a viable alternative to petroleum fuels due to their renewability, low or no emission and the potential to provide energy security and local economic benefits. This paper presents the results of various oils being tested as diesel fuel alternatives, including coconut oil unblended and blended with diesel fuel. The effects on engine performance and efficiency, the corresponding problems associated with their use, the atomization characteristics in the process of spray formation, engine combustion and the mechanism of the effect is also discussed on the basis of emissions, combustion parameters and spray characteristics.

Published
2005

19. Interaction Effects on Combustion of Alcohol Droplet Pairs

Author

OKAI, Keiichi, ONO, Yutaka, MORIUE, Osamu, SHIBA, Seiji, ARAKI, Mikiya, NOMURA, Hiroshi, SHIGA, Seiichi, TSUE, Mitsuhiro, and KONO, Michikata

Subjects
Physics::Fluid Dynamics, endocrine system, Liquid Fuel, Interaction Effects, technology, industry, and agriculture, Physics::Atomic and Molecular Clusters, Combustion, Physics::Chemical Physics, complex mixtures, Disruptive Combustion, eye diseases, Astrophysics::Galaxy Astrophysics, High Pressure Combustion
Abstract

Experimental investigation was conducted on two droplet-array combustion of methanol and methanol/dodecanol mixture fuels in microgravity. For methanol, effects of ambient pressure and droplet spacing were examined. Results show that the droplet lifetime decreases with increasing spacing at relatively low pressure and the droplet lifetime becomes independent of spacing at higher-subcritical and supercritical pressures. For methanol/dodecanol mixture, effects of pressure, fuel composition were investigated in terms of occurrence of disruption. Disruption of droplet during combustion was demonstrated both for single droplet and droplet pairs.

Published
2001

20. Investigation of Supersonic Jet Noise Sources Using the Optical CT Method and a Microphone Array

Author

Takahashi, Yasuhiro, Morita, Kohei, Araki, Mikiya, Kojima, Takayuki, Taguchi, Hideyuki, and Shiga, Seiichi

Abstract

平成24年度宇宙輸送シンポジウム (2013年1月17日-1月18日. 宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS)), 相模原市, 神奈川県, Space Transportation FY2012 (January 17-18, 2013. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS)), Sagamihara, Kanagawa Japan, By use of schlieren optics and microphones, jet noise sources of a rectangular hypersonic nozzle are investigated experimentally. Tomographic reconstruction of density fluctuation distribution of the jet and the cross-correlation analysis between the schlieren optics and the microphones are carried out. Maximum cross-correlation distributions show that the sound wave is highly directional within the downstream cone angle. In order to discuss the intensity of noise sources, the amplitude of the light intensity fluctuation and the maximum cross-correlations are multiplied at each measured point, which indicate the contribution of local noise sources to each microphone. The accuracy of the optical CT method is verified using a microphone array., 形態: カラー図版あり, 形態: PDF, Physical characteristics: Original contains color illustrations, Physical characteristics: PDF, 資料番号: AA0061856025, レポート番号: STCP-2012-025

Published
2013

21. Effect of Nozzle Configuration on Takeoff Noise of a Hypersonic Transport

Author

Gonzalez, Palencia Juan C., Sano, Norihisa, Tanaka, Kyohei, Araki, Mikiya, Kojima, Takayuki, Taguchi, Hideyuki, and Shiga, Seiichi

Subjects
Nozzle Configuration, Hypersonic Transport, Effective Perceived Noise Level, Takeoff Noise
Abstract

Effect of nozzle configuration on the takeoff noise of a hypersonic transport is investigated based on small-scale nozzle experiments. In the Japan Aerospace Exploration Agency, the precooled turbojet (PCTJ) engine aimed at the hypersonic flight is under development. The takeoff noise of the full-scale vehicle is assessed before it is put into the operation using an acoustic simulation method. By matching the jet velocity and jet Mach number with the realistic PCTJ engine condition, the acoustic characteristics of the hypersonic nozzle are duplicated with a small-scale nozzle model. The jet noise database around the hypersonic nozzle is established through a number of experiments, and by taking into account 1) the nozzle scale, 2) the number of nozzles, 3) the direction of installation, 4) the measurement distance and angle based on the flight trajectory, and 5) the atmospheric absorption, the effective perceived noise level (EPNL) at the flyover point is calculated. It is shown that the nozzle configuration has a large impact on the takeoff noise, and that such an assessment could contribute to the improvement of the integration design of the vehicle., 形態: 図版あり, Physical characteristics: Original contains illustrations, 資料番号: DS1540529005

Published
2016

23. スリット噴射が極超音速ノズルから噴出する超音速噴流の不安定性に及ぼす影響

Author

Gonzalez, Palencia Juan C., Muraki, Mizuho, Araki, Mikiya, Kojima, Takayuki, Taguchi, Hideyuki, and Shiga, Seiichi

Subjects
Jet (fluid), Hypersonic speed, Materials science, Supersonic Jet Noise, Astrophysics::High Energy Astrophysical Phenomena, Nozzle, Mechanics, respiratory system, equipment and supplies, Slit, Instability, complex mixtures, Linear Stability Analysis, Supersonic speed, High Energy Physics::Experiment, Velocity Profile, Hypersonic Transport, human activities, circulatory and respiratory physiology
Abstract

In a previous study, the authors proposed slit injection as a jet noise suppressor for the Pre-cooled Turbojet Engine, and the noise reduction performance was examined experimentally. Using the slit injection, the noise radiation decreased. It was implied that, by using the slit injection, the instability of the jet was suppressed due to the deformation of the velocity profile of the jet. In this study, the effect of the deformation of the velocity profile of the jet by using the slit injection on the instability of the jet was investigated numerically. The velocity profiles were given by the results of a Pitot tube measurement. The stability of the jet was investigated using the linear stability analysis. The numerical results were compared with the jet noise spectra obtained experimentally. It was found that, by using the slit injection, the instability of the main jet oscillation mode, which may contribute to the noise radiation, was suppressed due to the mitigation of the steep velocity gradient of the main jet shear layer., 形態: 図版あり, Physical characteristics: Original contains illustrations, 資料番号: PA1520028000

Published
2015

24. Impact of new vehicle market composition on the light-duty vehicle fleet CO2 emissions and cost.

Author

Palencia, Juan C. González, Otsuka, Yuki, Araki, Mikiya, and Shiga, Seiichi

Abstract

Internal combustion engine vehicles dominated road transport during the twentieth century. Nevertheless, the panorama is likely to change in the future, with electric-drive vehicle sales increasing due to technology improvement, cost reduction, infrastructure development and increasing environmental awareness. A new vehicle market model and a vehicle stock turnover model were combined to estimate the optimum composition of the 2050 new vehicle market in Japan under different scenarios; and the impact of changes in the new vehicle market composition on the light-duty vehicle fleet. The Base scenario is dominated by internal combustion engine vehicles and hybrid electric vehicles. Fuel cell hybrid electric vehicles dominate when low cost is prioritized; while shift to battery electric vehicles occurs when low CO 2 emissions are prioritized. CO 2 emissions are reduced 56.9% between 2012 and 2050 in the Base scenario. Diffusion of lightweight mini-sized battery electric vehicles has the largest CO 2 emissions reductions, 87.3% compared with the 2050 baseline value; with negative cash flow after 2044. [ABSTRACT FROM AUTHOR]

Published
2016
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