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Journal of aeronautics, astronautics and aviation, Series A最新文献

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Wake characteristics of a model wind turbine and an actuator disk model 风力机模型及作动盘模型尾迹特性分析
Journal of aeronautics, astronautics and aviation, Series A Pub Date : 2015-09-01 DOI: 10.6125/15-0209-838
J. Miau, Sin An Lin, Jyun Hao Fong, Chung Chuan Lin, T. Leu, Ta-Chung Wang, Chien-Chou Tseng
{"title":"Wake characteristics of a model wind turbine and an actuator disk model","authors":"J. Miau, Sin An Lin, Jyun Hao Fong, Chung Chuan Lin, T. Leu, Ta-Chung Wang, Chien-Chou Tseng","doi":"10.6125/15-0209-838","DOIUrl":"https://doi.org/10.6125/15-0209-838","url":null,"abstract":"Wake characteristics of a model wind turbine and a porous disk respectively immersed in a uniform free stream and turbulent boundary layers were studied experimentally. Under the latter experimental condition, two boundary layers of different thickness, about 5.5 and 1.5 D, respectively, where D denotes the diameter of the model wind turbine, were considered. Based on the hot-wire velocity measurements in the near wake region, it is found that irrespective of the models the wake flow development in the thicker boundary layer appear to be dominated by the large scale eddies in the boundary layer, whereas in the thinner boundary layer, the wake flow development relies on the turbulent eddies generated by the model, similar to the situation that the model is immersed in a uniform free stream.","PeriodicalId":335344,"journal":{"name":"Journal of aeronautics, astronautics and aviation, Series A","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115536880","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
Qualitative Analysis of a Synthetic Jet Actuator with Different Cavity Thickness and Export Area 不同腔厚和输出面积合成射流作动器的定性分析
Journal of aeronautics, astronautics and aviation, Series A Pub Date : 2015-09-01 DOI: 10.6125/15-0409-848
Yung-Lan Yeh, Jing-Min Tang, Shi-Shiung Hsu
{"title":"Qualitative Analysis of a Synthetic Jet Actuator with Different Cavity Thickness and Export Area","authors":"Yung-Lan Yeh, Jing-Min Tang, Shi-Shiung Hsu","doi":"10.6125/15-0409-848","DOIUrl":"https://doi.org/10.6125/15-0409-848","url":null,"abstract":"Present study investigates performance of synthetic jet actuator qualitatively. Its effectiveness of thickness of cavity, export area, working frequency and input voltage will be mainly studied by improved smoke flow visualization. The resonance frequency is also checked by the Helmholtz Resonance method and to well know interaction between the most effectiveness working frequency and cavity thickness. Experimental results indicated that higher input voltage makes higher smoke flow deflection angle and show the most obvious variation occurs at 200-400 Hz. Results also show the most efficiency working frequency is closed to resonance frequency of 400 Hz. The jet-to-wind velocity ratio of cross flow shows the same explanation. The ratio is inverse proportion to inflection level and proportion to penetration depth and turbulence intensity. Synthetic jet actuator with property cavity volume can cause higher exit velocity and increase velocity ratio R. It will increase penetration depth and cause higher turbulent intensity. Finally, the effect is more obvious and influence area is much larger.","PeriodicalId":335344,"journal":{"name":"Journal of aeronautics, astronautics and aviation, Series A","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131512049","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
The Numerical Analysis and Experimental Research of an Aspirated Counter-Rotating Compressor 吸气式反向旋转压缩机的数值分析与实验研究
Journal of aeronautics, astronautics and aviation, Series A Pub Date : 2015-09-01 DOI: 10.6125/15-0404-847
Peng Zhang, Bo Liu, Lei Shi
{"title":"The Numerical Analysis and Experimental Research of an Aspirated Counter-Rotating Compressor","authors":"Peng Zhang, Bo Liu, Lei Shi","doi":"10.6125/15-0404-847","DOIUrl":"https://doi.org/10.6125/15-0404-847","url":null,"abstract":"Domain scaling method was used in the unsteady numerical simulation of a dual-stage counter-rotating compressor. Numerical simulation results show that there exist much high entropy low energy fluids in the tip region on the near stall condition. In order to remove the high entropy flows near the shroud casing and improve the performance of the counter-rotating compressor, the boundary layer removal was conducted on the shroud casing over front rotor (R1) and rear rotor (R2) blade tip region. By shroud casing boundary layer suction, the flow field in the tip area improves greatly and the efficiency of the compressor increases by 0.58%. Based on the numerical results, the boundary layer suction system and measurement platform were established afterwards. The experiment was carried out with 0.9% relative suction rate in R1 and R2 tip region shroud casing respectively at 70% corrected rotating speed. Experimental results also show that shroud casing boundary layer suction can improve the compressor's performance effectively on the small flow rate conditions and has a positive role to enlarge the stable operating range.","PeriodicalId":335344,"journal":{"name":"Journal of aeronautics, astronautics and aviation, Series A","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123812473","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
Invited Paper: Photoignited Aluminum Nanopowder Combustion in Air 特邀论文:光点燃纳米铝粉在空气中的燃烧
Journal of aeronautics, astronautics and aviation, Series A Pub Date : 2015-09-01 DOI: 10.6125/15-0710-852
Luca Castronuovo, D. Dunn-Rankin, John Garman
{"title":"Invited Paper: Photoignited Aluminum Nanopowder Combustion in Air","authors":"Luca Castronuovo, D. Dunn-Rankin, John Garman","doi":"10.6125/15-0710-852","DOIUrl":"https://doi.org/10.6125/15-0710-852","url":null,"abstract":"Metal combustion has recently received renewed interest as a result of the ability to manufacture and characterize nanoparticles. These nanoparticles are known to exhibit desirable traits, mainly their high specific surface area. The objective of this work was to investigate experimentally the oxidation behavior of nanosized aluminum powders in air under white light photo-ignition conditions. Powder samples with three different nominal size particles of 20, 50, and 70 nm were characterized with HRSEM and TEM. The results showed that the reactivity of photo-ignited powder decreased with increasing size whereas the energy threshold for ignition had the opposite trend. The presence of a natural oxide coating and changes in the optical properties of the powder are proposed as the cause of this behavior.","PeriodicalId":335344,"journal":{"name":"Journal of aeronautics, astronautics and aviation, Series A","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128146687","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: 1
An Open-Loop Solar Tracking for Mobile Photovoltaic Systems 移动光伏系统的开环太阳能跟踪
Journal of aeronautics, astronautics and aviation, Series A Pub Date : 2015-09-01 DOI: 10.6125/15-0401-846
Chin-E. Lin, Cheng Hsien Chen, Ying-Chi Huang, H. Chen
{"title":"An Open-Loop Solar Tracking for Mobile Photovoltaic Systems","authors":"Chin-E. Lin, Cheng Hsien Chen, Ying-Chi Huang, H. Chen","doi":"10.6125/15-0401-846","DOIUrl":"https://doi.org/10.6125/15-0401-846","url":null,"abstract":"Global Positioning System (GPS) data determines Earth location in global coordinates. It offers the same information relative to Sun. By adding attitude and heading information from the mobile mechanics, a dynamic solar tracking algorithm can accurately calculate solar azimuth and elevation using a microprocessor controller. This paper introduces a dynamic solar tracking for photovoltaic control. A simple algorithm is formulated using the astronomy physics of solar orbit to calculate an accurate azimuth angle and elevation angle toward solar radiation. An Arduino microprocessor is used to collect GPS and RM-G144 messages to control a dual-axis servo mechanism for solar tracking. By on-board calculation, the proposed solar tracking can be efficiently implemented on microprocessor for different conditions. The proposed dynamic solar tracking system integrates sensors and controllers to verify its performance for mobile PV applications.","PeriodicalId":335344,"journal":{"name":"Journal of aeronautics, astronautics and aviation, Series A","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127693030","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: 6
Passengers' Perspective Toward Airport Service Quality: The Comparison Between TPE and TSA 旅客对机场服务质量的看法:TPE与TSA的比较
Journal of aeronautics, astronautics and aviation, Series A Pub Date : 2015-09-01 DOI: 10.6125/15-0326-845
Shih-Yao Kuo, Shu-Chuan Chen
{"title":"Passengers' Perspective Toward Airport Service Quality: The Comparison Between TPE and TSA","authors":"Shih-Yao Kuo, Shu-Chuan Chen","doi":"10.6125/15-0326-845","DOIUrl":"https://doi.org/10.6125/15-0326-845","url":null,"abstract":"Due to urban development and traffic congestion, new international airports were built in the suburbs of many metropolises to replace the original ones, which usually have been transformed to operate domestic flights. In Taiwan, these city airports play the role as regional airports to majorly operate the direct flights between the two sides across the Taiwan Strait. With the two types of business models, passengers must have diverse expectations and perceived different service quality. This study examines passengers' perceptions regarding service quality served by Taiwan Taoyuan International Airport (TPE) and Taipei Songshan Airport (TSA). The empirical data were collected by using the questionnaire survey, distributed to the air passengers departing from or arrived at these two airports. The research results reveal that passengers perceived better service quality in TPE. TSA only surpassed TPE in one item ＂Ground transportation to/from airport＂. It is comprehensible that TSA is located in Taipei city and the Mass Rapid Transit (MRT) system is very convenient.","PeriodicalId":335344,"journal":{"name":"Journal of aeronautics, astronautics and aviation, Series A","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133270320","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
Dynamical Modelling of FORMOSAT-7 NB-Satellite Multibody System FORMOSAT-7 NB-Satellite多体系统动力学建模
Journal of aeronautics, astronautics and aviation, Series A Pub Date : 2015-09-01 DOI: 10.6125/15-0203-835
Shui-Lin Weng, Y. Lian
{"title":"Dynamical Modelling of FORMOSAT-7 NB-Satellite Multibody System","authors":"Shui-Lin Weng, Y. Lian","doi":"10.6125/15-0203-835","DOIUrl":"https://doi.org/10.6125/15-0203-835","url":null,"abstract":"Many space vehicles assume their final configuration after an initial deployment phase. During this phase, one part of the vehicle moves with respect to another part as the configuration evolves from its initial to its final form. Presence of a mobile solar array attached to the satellite bus with a controlled hinge leads to significant complication of the satellite dynamics. A mathematical model as well as corresponding software is necessary for numerical investigation of the satellite arbitrary movements. To combine the computational advantages- the non-working constraint forces and torques do not appear, and the resulting equation set is of minimum dimension- comparative studies suggested that some related generalization of Lagrange's form of d'Alembert's principle most closely meet these needs. For FORMOSAT-7 NSPO built satellite, in order to accommodate the field of view requirements originated mainly from the mission payload, a spacecraft bus attached with single leaf of solar array configuration is designed. The asymmetric configuration constitutes a two body dynamics problem, not one whole rigid body case. In this paper, the FORMOSAT-7 NB-satellite attitude dynamics modelling formulation is managed pragmatically. Its final expression of equations of motion derived systematically through the general dynamical equations of motion based on Lagrange's form of d'Alembert's principle and expressed in terms of kinematics variables, velocity and angular velocity coefficients, and generalized forces is presented meticulously. Finally, the equations of motion are validated through cases of numerical simulations.","PeriodicalId":335344,"journal":{"name":"Journal of aeronautics, astronautics and aviation, Series A","volume":"132 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134500727","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: 1
Airborne BTS Service on Flying Platform via Microwave Air-Bridging 基于微波空桥的飞行平台机载BTS服务
Journal of aeronautics, astronautics and aviation, Series A Pub Date : 2015-06-01 DOI: 10.6125/15-0216-840
Chin-E. Lin, Ying-Chi Huang
{"title":"Airborne BTS Service on Flying Platform via Microwave Air-Bridging","authors":"Chin-E. Lin, Ying-Chi Huang","doi":"10.6125/15-0216-840","DOIUrl":"https://doi.org/10.6125/15-0216-840","url":null,"abstract":"A new airborne Base Transceiver Station (BTS) service is constructed and verified on a Low Altitude Flying Platform (LAFP). A telecommunication signal relay via LAFP is proposed. To establish effective frequency isolation, the downlink relay falls on the construction of steady Microwave Air-Bridging (MAB) between LAFP and ground E1 optical fiber network. An efficient GPS-to-GPS (G2G) tracking system is designed and implemented using Adaptive Neural Fuzzy Inference System (ANFIS) algorithm for controlling the antenna pointing mechanism. Flight tests using ultra-light aircraft are carried out to verify the microwave link performance with acceptable feasibility and reliability on the proposed LAFP for airborne mobile communication services.","PeriodicalId":335344,"journal":{"name":"Journal of aeronautics, astronautics and aviation, Series A","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114723760","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
Flow and Heat transfer Characteristics in a Square Cavity at High Rayleigh Number 高瑞利数方形腔内流动与换热特性
Journal of aeronautics, astronautics and aviation, Series A Pub Date : 2015-06-01 DOI: 10.6125/15-0104-830
F. Hsu, T. Cheng
{"title":"Flow and Heat transfer Characteristics in a Square Cavity at High Rayleigh Number","authors":"F. Hsu, T. Cheng","doi":"10.6125/15-0104-830","DOIUrl":"https://doi.org/10.6125/15-0104-830","url":null,"abstract":"Numerical simulations are performed to investigate the flow and heat transfer characteristics in a air-filled (Pr = 0.71), two-dimensional (2-D) cavity where the flow is induced by a buoyancy force due to differential heating of vertical walls at high Rayleigh numbers (10^9, 1.58 × 10^9, 10^(9.5), and 10^(10)). The governing equations are discretized spatially into a fourth-order-accurate compact form and integrated temporally by the second-order-accurate alternating direction implicit (ADI) method. Numerical results of instantaneous and time-averaged flow structures are presented. The time-averaged temperature and vertical velocity near the hot wall are used to generate the mean temperature and velocity profiles in the turbulent boundary layer, and to illustrate the required spatial resolution for simulations of turbulent natural convection. A universal structure is found to exist in the mean velocity and temperature turbulent boundary layer profiles for x^+ ＜ 10. This finding is also in good agreement with reported experimental data.","PeriodicalId":335344,"journal":{"name":"Journal of aeronautics, astronautics and aviation, Series A","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125396197","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
Evaluation of forming quality and spring-back of fuel cell metallic bipolar plate during stamping via simulations 模拟评价燃料电池金属双极板冲压成形质量及回弹
Journal of aeronautics, astronautics and aviation, Series A Pub Date : 2015-06-01 DOI: 10.6125/15-0504-850
K. Huang, Sheng-Jye Hwang, W. Lai
{"title":"Evaluation of forming quality and spring-back of fuel cell metallic bipolar plate during stamping via simulations","authors":"K. Huang, Sheng-Jye Hwang, W. Lai","doi":"10.6125/15-0504-850","DOIUrl":"https://doi.org/10.6125/15-0504-850","url":null,"abstract":"","PeriodicalId":335344,"journal":{"name":"Journal of aeronautics, astronautics and aviation, Series A","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122893497","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: 3
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