Journal of aeronautics, astronautics and aviation, Series A最新文献_第8页

Numerical Study on Evolution Characteristics of Vortices in Supersonic Mixing Layers 超声速混合层涡旋演化特性的数值研究

Journal of aeronautics, astronautics and aviation, Series A Pub Date : 2016-06-01 DOI: 10.6125/16-0320-880

Guangming Guo, Hong Liu, Bin Zhang

{"title":"Numerical Study on Evolution Characteristics of Vortices in Supersonic Mixing Layers","authors":"Guangming Guo, Hong Liu, Bin Zhang","doi":"10.6125/16-0320-880","DOIUrl":"https://doi.org/10.6125/16-0320-880","url":null,"abstract":"Vortices inside mixing layers impose remarkable aero-optical distortions on a beam even at moderate subsonic speeds. However, with knowledge about vortices evolution in this mixing layer flow field, especially for evolution characteristics of vortices in supersonic mixing layer flow field is limited because the supersonic flow has very high speed. In this study, the large eddy simulation (LES) was used to simulate the supersonic mixing layer flow field. The growth rate of supersonic mixing layer and site of vortex rolling up acted as two evaluation parameters to quantitatively investigate the evolution characteristics of vortices in supersonic mixing layers. Subsequently, three suits of cases, in which the compressibility of flow field, initially normal disturbance, and compositions of the two incoming streams making up a supersonic mixing layer were taken into account, were performed to investigate the evolution characteristics of vortices in supersonic mixing layer in detail. The results indicated that the evolution characteristics of vortices were obviously affected by the compressibility of flow field, initially normal disturbance, and compositions of the two incoming streams. Finally, several conclusions drawn from this study were presented.","PeriodicalId":335344,"journal":{"name":"Journal of aeronautics, astronautics and aviation, Series A","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132670983","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

AN EQUIVALENT MECHANICAL MODEL FOR LIQUID SLOSHING ON SPACECRAFT 航天器上液体晃动的等效力学模型

Journal of aeronautics, astronautics and aviation, Series A Pub Date : 2016-06-01 DOI: 10.6125/15-1005-864

Yi-Dai Yang, W. Jing, Zi-Liang Kang, Junting Lu

{"title":"AN EQUIVALENT MECHANICAL MODEL FOR LIQUID SLOSHING ON SPACECRAFT","authors":"Yi-Dai Yang, W. Jing, Zi-Liang Kang, Junting Lu","doi":"10.6125/15-1005-864","DOIUrl":"https://doi.org/10.6125/15-1005-864","url":null,"abstract":"In order to improve the accuracy of the attitude control problem encountered by spacecraft with liquid containers, a study on dynamic modeling of liquids in moving containers is conducted. As a result, a new equivalent mechanical model which can describe the relative rolling movement of the liquid to the containers is proposed, using the method of Finite-element along with Fluid mechanics. The new equivalent mechanical model has one more degree of freedom and better identification of the viscous resistance compared with the old ones. Therefore, the dynamic influences on the spacecraft caused by the sloshing of the liquid during the attitude maneuvering procedure can be calculated more accurately by using the new model and so is the changing of dynamic factors, as well as the dynamic influence caused by the viscous resistance between the liquid and the container. The research results can provide theoretical basis for attitude control problem of spacecraft with liquid containers and thus achieve the purpose of improving control accuracy. The simulation results demonstrate that the FCFS model fits the previous simulation work and experimental data well, and thus is applicable.","PeriodicalId":335344,"journal":{"name":"Journal of aeronautics, astronautics and aviation, Series A","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121481537","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

UAV Slat Design with Wind Tunnel Verification to Support Flight Performance Tests 无人机板设计与风洞验证，以支持飞行性能测试

Journal of aeronautics, astronautics and aviation, Series A Pub Date : 2016-06-01 DOI: 10.6125/15-1224-871

Yung-Lan Yeh, Chin-E. Lin, Ching Lung Lu

引用次数: 0

A Novel GPS Multipath Mitigation Method Based on the TKO and MPI Algorithm 一种基于TKO和MPI算法的GPS多径抑制方法

Journal of aeronautics, astronautics and aviation, Series A Pub Date : 2016-03-01 DOI: 10.6125/15-0806-857

Xiao-Ting Zhang, X. Zhan, Wenhan Yuan, Songping Wu

{"title":"A Novel GPS Multipath Mitigation Method Based on the TKO and MPI Algorithm","authors":"Xiao-Ting Zhang, X. Zhan, Wenhan Yuan, Songping Wu","doi":"10.6125/15-0806-857","DOIUrl":"https://doi.org/10.6125/15-0806-857","url":null,"abstract":"Multipath is one of dominant error source in satellite positioning. Various multipath mitigation methods have been developed. This paper proposes a new efficient method. The motivation for this proposed method is to combine the Teager-Kaiser Operator (TKO) with the Multipath Indicator (MPI) algorithm to achieve a better mitigation performance by taking advantages of their merits. The method first applies the TKO on received signals’ Auto Correlation Function (ACF) to get an initiate estimation of GPS multipath, and at the same time limit the received signals within a certain range to meet the application condition of the MPI algorithm. Then we employ MPI module to make compensation for the code tracking error to have a more accurate estimation. Finally, by overcoming the respective shortcomings of the TKO and MPI algorithm, the simulation results show that compared to the traditional narrow Early-Minus-Late technique (nEML), the original TKO and the original MPI algorithm, the proposed method can get a smaller code tracking error and achieve the goal of the GPS multipath mitigation, especially in the low Signal-to-Noise Ratio (SNR) surroundings.","PeriodicalId":335344,"journal":{"name":"Journal of aeronautics, astronautics and aviation, Series A","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124730265","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

GNSS Constellation Integrity Evaluation Based on Quality Control 基于质量控制的GNSS星座完整性评价

Journal of aeronautics, astronautics and aviation, Series A Pub Date : 2016-03-01 DOI: 10.6125/15-0715-854

Xianli Su, X. Zhan, Jiaxun Tu

引用次数: 0

The Relationship of Buckle Pattern Change and Vibration Mode Shifting: Thermal Postbuckling and Vibration of Composite Laminates 复合材料层合板的热后屈曲和振动与屈曲模式变化的关系

Journal of aeronautics, astronautics and aviation, Series A Pub Date : 2016-03-01 DOI: 10.6125/15-1120-869

Shih-Yao Kuo, L. Shiau, Jing-Wei Chuang, C. Cheng

引用次数: 0

Effect of Thermal Radiation and Internal Heat Generation on Natural Convection from a Vertical Flat Plate in Porous Media Considering Soret/Dufour Effects 考虑Soret/Dufour效应的多孔介质中垂直平板的热辐射和内部热生成对自然对流的影响

Journal of aeronautics, astronautics and aviation, Series A Pub Date : 2016-03-01 DOI: 10.6125/15-1017-865

Chuo-Jeng Huang

{"title":"Effect of Thermal Radiation and Internal Heat Generation on Natural Convection from a Vertical Flat Plate in Porous Media Considering Soret/Dufour Effects","authors":"Chuo-Jeng Huang","doi":"10.6125/15-1017-865","DOIUrl":"https://doi.org/10.6125/15-1017-865","url":null,"abstract":"The effect of thermal radiation and internal heat generation on natural convection from a vertical flat plate maintained with uniform wall temperature and concentration (UWT/UWC) in a saturated porous medium considering Soret/Dufour effects is numerically analyzed. The similarity solution is obtained by assuming the internal heat generation is in exponential decaying form. The Rosseland diffusion approximation is employed to describe the radiative heat flux. Similar governing equations are solved by Keller box method. Comparisons showed excellent agreement with the numerical data in previous works. Numerical data for the dimensionless temperature profile, the dimensionless concentration profile, the local Nusselt number, and the local Sherwood number are presented graphically for the buoyancy ratio N, the Lewis number Le, the Soret parameter S, the Dufour parameter D, the thermal radiation parameter R_d and the internal heat generation coefficient A*. The effect of all these parameters on the convective transport has been analyzed, and the variation of heat and mass transfer coefficients with the above parameters is presented through computer generated graphs. Increasing N and R_d will enhance the local Nusselt number as well as the local Sherwood number. An increase of D decreases (increases) the local Nusselt (Sherwood) number. For fixed S, as the internal heat generation coefficient A^* increases will decrease (increase) the local Nusselt (Sherwood) number.","PeriodicalId":335344,"journal":{"name":"Journal of aeronautics, astronautics and aviation, Series A","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127940188","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

Characters of the Recirculation Zone of Backward Facing Step for Hypersonic in Near Space 近空间高超声速后向台阶再循环区特征

Journal of aeronautics, astronautics and aviation, Series A Pub Date : 2016-03-01 DOI: 10.6125/15-0911-863

Guangming Guo, Hong Liu, Bin Zhang

{"title":"Characters of the Recirculation Zone of Backward Facing Step for Hypersonic in Near Space","authors":"Guangming Guo, Hong Liu, Bin Zhang","doi":"10.6125/15-0911-863","DOIUrl":"https://doi.org/10.6125/15-0911-863","url":null,"abstract":"The ambient air of backward facing step in near space is rarefied; consequently, the traditional numerical simulation methods based on continuous fluid hypothesis are not applicable in near space. For the backward facing step located in near space, the characteristic quantities of its recirculation zone, such as the reattachment point, reattachment length, and inclination angle were obtained by Direct Simulating Monte Carlo (DSMC) algorithm. A new ray tracing technique based on computational grid and direct simulation is proposed for computing the aero-optical aberration of recirculation zone. Based on the computational results obtained by employing DSMC and ray tracing method for several cases of different hypersonic Maher numbers in near space, analysis and discussion are performed and conclusions drawn from this paper are also made, as follows: (1) The length of recirculation zone of backward facing step is significantly shortened for hypersonic in near space, which indicates that the recirculation zone is severely squeezed by the shear flow induced by the separation of inflow as traversing the backward facing step. (2) The effect of Mach number on Strehl Ratio can be neglected if the altitude exceeds 40 Km. Specifically, the aero-optical distortion of the recirculation zone is significant for hypersonic if the altitude under 30 Km, whereas it is tiny and approximately invariable for hypersonic if the altitude exceeds 40 Km","PeriodicalId":335344,"journal":{"name":"Journal of aeronautics, astronautics and aviation, Series A","volume":"2015 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131147898","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

Strategic De-confliction Trajectory Planning Using Max-plus Approach 基于Max-plus方法的战略去冲突轨迹规划

Journal of aeronautics, astronautics and aviation, Series A Pub Date : 2016-03-01 DOI: 10.6125/15-0901-861

Yun-xiang Han, Xiao-qiong Huang

引用次数: 0

Fast Robust Adaptive Backstepping Control with Its Application to Fault-Tolerant Flight Envelope Protection 快速鲁棒自适应反演控制及其在容错飞行包络线保护中的应用

Journal of aeronautics, astronautics and aviation, Series A Pub Date : 2016-03-01 DOI: 10.6125/15-0826-859

S. Gong, Shiqian Liu, Qi Wu, Yuxia Li, Cong Lv

引用次数: 0