Journal of The Japan Society for Aeronautical and Space Sciences最新文献_第10页

低圧マイクロ波放電プラズマのN2 2+バンドの放射と温度特性 N2 2+带低压微波放电等离子体的辐射和温度特性

Journal of The Japan Society for Aeronautical and Space Sciences Pub Date : 2007-05-05 DOI: 10.2322/JJSASS.55.232

健二澁澤, 賢人舩津, 紘行白井, 文雄高草木

{"title":"低圧マイクロ波放電プラズマのN2 2+バンドの放射と温度特性","authors":"健二澁澤, 賢人舩津, 紘行白井, 文雄高草木","doi":"10.2322/JJSASS.55.232","DOIUrl":"https://doi.org/10.2322/JJSASS.55.232","url":null,"abstract":"Spectroscopic measurements of microwave-discharged low-pressure nitrogen plasmas were made in a tube with a diameter of 9.5mm and length of 42mm. Intense radiation of N2 2+ bands and weak radiations of N2+ 1-, N2 1+, and NO γ bands were observed. Unique intensity distribution of N2 2+ bands with high vibrational levels was observed as in the arc-discharged micro-air plasma-jets. Rotational and vibrational temperatures were determined by a spectral matching method with N2 2+ (0, 2) and (1, 3) bands. The vibrational state of the plasma was also investigated by the N2 2+ band intensity. As the experimental spectra could not be reconstructed by a usual equilibrium radiation theory with one rotational temperature, the theoretical spectra were constructed with the effects of predissociation and theoretical non-Boltzmann rotational population distribution, and were compared with the experimental ones. As a result, it was found that the vibrational and rotational temperatures were dependent on the theoretical model for rotational population distribution, that the rotational temperature was dependent on the vibrational states, and that the plasmas were in the vibrational non-equilibrium state.","PeriodicalId":144591,"journal":{"name":"Journal of The Japan Society for Aeronautical and Space Sciences","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126463247","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Visualization of Wave Rotor Inner Flow Dynamics 波浪转子内部流动动力学的可视化

Journal of The Japan Society for Aeronautical and Space Sciences Pub Date : 2007-03-01 DOI: 10.2322/JJSASS.54.345

K. Okamoto, T. Nagashima, K. Yamaguchi

{"title":"Visualization of Wave Rotor Inner Flow Dynamics","authors":"K. Okamoto, T. Nagashima, K. Yamaguchi","doi":"10.2322/JJSASS.54.345","DOIUrl":"https://doi.org/10.2322/JJSASS.54.345","url":null,"abstract":"The design of a wave rotor requires an understanding of the pressure wave dynamics in the rotor passages. The present paper describes a two-dimensional numerical simulation and an experimental visualization of the wave rotor compression process. First, a unique experimental apparatus with fixed cells and rotating ports was constructed for visualization and direct measurements; this arrangement is opposite to the conventional setup. Next, experimental and numerical results were compared to verify the simulation modelling, particularly with regard to the propagation velocity of pressure waves in the passages. Lastly, the effects of gradually opening the passage to the ports and leakage through the clearance, which are considered to be dominant factors in wave rotor operation, on the pressure wave dynamics were carefully investigated. The results showed that the gradual passage opening greatly influences the primary shock wave, whereas the leakage mostly influences the secondary (reflected) shock wave. Moreover, it was revealed that the leakage generates an extra pressure wave during the compression process due to the interaction between adjacent passages.","PeriodicalId":144591,"journal":{"name":"Journal of The Japan Society for Aeronautical and Space Sciences","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130909314","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 28

A New Approach to Estimating Micro-Debris’ Size Distribution from Solar Array Images 一种利用太阳阵列图像估计微碎片尺寸分布的新方法

Journal of The Japan Society for Aeronautical and Space Sciences Pub Date : 2006-12-05 DOI: 10.2322/JJSASS.54.527

Koki Fujita, H. Hirayama, T. Hanada

引用次数: 1

Experimental Observation on Low Cycle Fatigue Behavior of Symmetric Angle-Ply CFRP Laminate 对称角层CFRP复合材料低周疲劳性能试验观察

Journal of The Japan Society for Aeronautical and Space Sciences Pub Date : 2006-12-05 DOI: 10.2322/JJSASS.54.555

M. Sakai, N. Uda, K. Kunoo

引用次数: 0

学生による学生のための「学生交流会」 : 鳥人間チーム学生组织的学生交流会:鸟人组

Journal of The Japan Society for Aeronautical and Space Sciences Pub Date : 2006-09-05 DOI: 10.14822/KJSASS.54.632_281

丸山謙一郎

引用次数: 0

Wake Oscillation of Column Wall Jet in Uniform Flow 均匀流动中柱壁射流的尾迹振荡

Journal of The Japan Society for Aeronautical and Space Sciences Pub Date : 2006-07-05 DOI: 10.2322/JJSASS.54.288

Yohei Yoshida, Kotaro Sato, Yōichi Ono

引用次数: 2

Hybrid-GA を用いた二段式スペースプレーンの最適設計使用Hybrid-GA的两段式空间层的最佳设计

Journal of The Japan Society for Aeronautical and Space Sciences Pub Date : 2006-07-05 DOI: 10.2322/JJSASS.54.279

今村俊介, 小島広久, 土屋武司, 弘敏久保田

引用次数: 0

ヘリコプタ着陸進入時における地上騒音低減のための最適飛行 : 最適な高度・速度制御について直升机着陆时降低地面噪音的最佳飞行:关于最佳高度和速度控制

Journal of The Japan Society for Aeronautical and Space Sciences Pub Date : 2006-07-05 DOI: 10.2322/JJSASS.54.319

Takeshi Tsuchiya, Hirokazu Ishii, Junichi Uchida, Hiromi Gomi, Naoki Matayoshi, Yoshinori Okuno

{"title":"ヘリコプタ着陸進入時における地上騒音低減のための最適飛行 : 最適な高度・速度制御について","authors":"Takeshi Tsuchiya, Hirokazu Ishii, Junichi Uchida, Hiromi Gomi, Naoki Matayoshi, Yoshinori Okuno","doi":"10.2322/JJSASS.54.319","DOIUrl":"https://doi.org/10.2322/JJSASS.54.319","url":null,"abstract":"This study aims to obtain the optimal flights of a helicopter that reduce ground noise in its landing approach with an optimization technique and to conduct flight tests for confirming the effectiveness of the optimal solutions. Past experiments of JAXA (Japan Aerospace Exploration Agency) shows the noise of the helicopter varies significantly according to its flight conditions, especially depending on the flight path angle. We therefore build a simple noise model of the helicopter, in which the level of the noise generated from a point sound source is a function only of the flight path angle. By using equations of motion for flight in a vertical plane, we define optimal control problems for minimizing noise levels measured at points on the ground surface, and obtain optimal controls for specified initial altitudes, flight constraints, and wind conditions. The obtained optimal flights avoid the flight path angle which generates the large noise and decrease the flight time, which are different from the conventional flight. Finally, we verify the validity of the optimal flight patterns by the flight experiments. The actual flights following the optimal ones also result in the noise reduction, which shows the effectiveness of the optimization.","PeriodicalId":144591,"journal":{"name":"Journal of The Japan Society for Aeronautical and Space Sciences","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116234357","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

制御量制約を考慮した高速タンブリング物体の実時間姿勢制御法（第3報）-保存性状態量を利用したフィードバック制御則の導出- 考虑控制量制约的高速旋转物体的实际时间姿态控制法(第3报告)-利用保守性状态量的反馈控制则的导出-

Journal of The Japan Society for Aeronautical and Space Sciences Pub Date : 2006-04-05 DOI: 10.2322/JJSASS.54.151

Y. Tsuda, Shinichi Nakasuka

引用次数: 1

A Study on the Effect of Injection Angle to Two-Dimensional Supersonic Mixing Flow with Slotted Injection 射流角对开槽射流二维超声速混合流影响的研究

Journal of The Japan Society for Aeronautical and Space Sciences Pub Date : 2006-04-05 DOI: 10.2322/JJSASS.54.137

Keinosuke Inoue, S. Kawano, S. Aso

{"title":"A Study on the Effect of Injection Angle to Two-Dimensional Supersonic Mixing Flow with Slotted Injection","authors":"Keinosuke Inoue, S. Kawano, S. Aso","doi":"10.2322/JJSASS.54.137","DOIUrl":"https://doi.org/10.2322/JJSASS.54.137","url":null,"abstract":"Experimental and computational studies on supersonic mixing by slotted injection with various injection angle have been conducted. In the experiment flat plate model is installed into supersonic free stream of Mach number of 4 and fully developed turbulent boundary layer is established on the flat plate. The secondary jet is injected through slot nozzle set on the flat plate model in order to simulate SCRAM-jet supersonic mixer. Experiments are conducted by changing injection angle of helium gas in order to observe the effect of injection angle to the supersonic mixing. The flow fields are visualized by the Schulieren method. Also surface pressure distributions and spatial distributions are measured. The same flow fields are simulated by solving tow-dimensional full Navier-Stokes equation of mixture gas of air and helium and calculated results are compared with experiments. Quite good agreement is obtained in wall pressure distributions. And qualitative agreement is obtained in volume fruction distribution. By using the calculated results, the correlations between the mixing rate and the total pressure loss of the flow field are obtained.","PeriodicalId":144591,"journal":{"name":"Journal of The Japan Society for Aeronautical and Space Sciences","volume":"134 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121252118","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0