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Numerical Simulation of Q-Switched Supersonic Flow Chemical Oxygen-Iodine Laser by Solving Time-Dependent Paraxial Wave Equation 求解随时间变化的近轴波方程的调q超声速流化学氧碘激光器数值模拟
Jsme International Journal Series B-fluids and Thermal Engineering Pub Date : 2006-11-15 DOI: 10.1299/JSMEB.49.1212
Masataro Suzuki, H. Matsueda, W. Masuda
{"title":"Numerical Simulation of Q-Switched Supersonic Flow Chemical Oxygen-Iodine Laser by Solving Time-Dependent Paraxial Wave Equation","authors":"Masataro Suzuki, H. Matsueda, W. Masuda","doi":"10.1299/JSMEB.49.1212","DOIUrl":"https://doi.org/10.1299/JSMEB.49.1212","url":null,"abstract":"The quality and power of an extracted beam from a Q-switched supersonic flow chemical oxygen-iodine laser have been investigated by numerical simulation. The flow system adopted in this study is the throat-mixing system proposed in a previous paper. Three-dimensional calculation for optics is coupled with one-dimensional calculation for gas flow including chemical reactions. Both geometric and wave optics are calculated and compared to assess the effects of diffraction. Wave optics is calculated with a time-dependent paraxial wave equation. The results indicate that wave and geometric optics are qualitatively similar in the time-dependent behavior of beam power. Quantitatively, it is found that diffraction reduces the extracted power by 9%. It is also found from the spreading half-angle of the beam for wave optics that the beam quality at a maximum power is equivalent to that of a plane wave; however, it is lower than that of continuous extraction.","PeriodicalId":414195,"journal":{"name":"Jsme International Journal Series B-fluids and Thermal Engineering","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128762330","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
Neural Network Control of Temperature Profile by Impinging Jet Arrays 撞击射流阵列温度分布的神经网络控制
Jsme International Journal Series B-fluids and Thermal Engineering Pub Date : 2006-11-15 DOI: 10.1299/JSMEB.49.951
Kazuyuki Yamamoto, Masami Imazeki, Naoyuki Hasegawa, K. Hishida
{"title":"Neural Network Control of Temperature Profile by Impinging Jet Arrays","authors":"Kazuyuki Yamamoto, Masami Imazeki, Naoyuki Hasegawa, K. Hishida","doi":"10.1299/JSMEB.49.951","DOIUrl":"https://doi.org/10.1299/JSMEB.49.951","url":null,"abstract":"The wall temperature profile in the flow field of an impinging two-jet array has been controlled using a neural network. The jet excitation is achieved by injection and suction through fine slits co-located at the nozzle exits to obtain a desired wall temperature profile. The wall temperature profile is determined \"uniquely\" by the excitation pattern so that the flow field is essentially considered as the \"function\" with the excitation pattern as the input and the wall temperature profile as an output. A neural network learns the inverse function of the flow field via offline learning and online learning, and is then serves as the controller. As a result, the wall temperature distribution is controlled with high accuracy and this demonstrates the applicability of control on the convective heat transfer process.","PeriodicalId":414195,"journal":{"name":"Jsme International Journal Series B-fluids and Thermal Engineering","volume":"111 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124109359","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
Flow Characteristics and Control of Vertical Upward Gas-Liquid Two-Phase Flow through a Sudden Contraction Pipe 突然收缩管道垂直向上气液两相流动特性及控制
Jsme International Journal Series B-fluids and Thermal Engineering Pub Date : 2006-11-15 DOI: 10.1299/JSMEB.49.1000
A. Voutsinas, T. Shakouchi, J. Takamura, K. Tsujimoto, T. Ando
{"title":"Flow Characteristics and Control of Vertical Upward Gas-Liquid Two-Phase Flow through a Sudden Contraction Pipe","authors":"A. Voutsinas, T. Shakouchi, J. Takamura, K. Tsujimoto, T. Ando","doi":"10.1299/JSMEB.49.1000","DOIUrl":"https://doi.org/10.1299/JSMEB.49.1000","url":null,"abstract":"The flow characteristics of upward gas-liquid two-phase flow through a vertical sudden contraction pipe is an area that has been less studied experimentally and numerically and that is still little known (1)-(3) . The drag and its reduction for an upward bubbly two-phase flow in a sudden contraction pipe are investigated. Vortices are generated just prior to and after contraction and they significantly affect the flow characteristics. A simple and economical method to control and smoothen the flow is proposed by mounting a small obstacle (ring) upstream the contraction. The effects of ring position, Reynolds number and volumetric gas flow rate are examined and positive results were seen in all flow conditions. Moreover, the pressure fluctuation phenomenon and its control downstream the contraction was considered.","PeriodicalId":414195,"journal":{"name":"Jsme International Journal Series B-fluids and Thermal Engineering","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127211328","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: 5
Drag Reduction Effect of BSA Monodispersed Solution in Microtube Flow BSA单分散溶液在微管流动中的减阻效果
Jsme International Journal Series B-fluids and Thermal Engineering Pub Date : 2006-11-15 DOI: 10.1299/JSMEB.49.1190
K. Kanda, Ming-wei Yang
{"title":"Drag Reduction Effect of BSA Monodispersed Solution in Microtube Flow","authors":"K. Kanda, Ming-wei Yang","doi":"10.1299/JSMEB.49.1190","DOIUrl":"https://doi.org/10.1299/JSMEB.49.1190","url":null,"abstract":"In recent biological and chemical analyses, microchips have attracted attention because of advantages such as high efficiency, small heat capacity, and high-speed reaction. Biochemical reagents and samples flow into the chips with the wall surface biologically or chemically modified. The mechanisms of the complex flow are not well-known. In this paper, the mechanisms are investigated using pressure drop measurements of the flow of BSA-(bovine serum albumin, protein generally used in analytical fields) dispersed solutions in microtubes with three kinds of surfaces: glass, PEEK (polyetheretherketone) and Hirec-Xl (a highly water-repellent agent, NTT-AT Co.), which have different properties. In the cases in which BSA solution flows on the Hirec-Xl and on the PEEK surface, results show reductions in the friction factor. On the other hand, in the case in which non BSA solution flow on any surface, results agree well with the Hagen-Poiseuille equation. Furthermore, reduction ratio in the friction factor depends on the concentration of BSA. These results imply that the interaction between the wall and the bio-molecules influences the behavior of the flow in microtubes.","PeriodicalId":414195,"journal":{"name":"Jsme International Journal Series B-fluids and Thermal Engineering","volume":"160 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133587386","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
Vortex Structure and Scale on an Unsteady Airfoil 非定常翼型涡结构与尺度
Jsme International Journal Series B-fluids and Thermal Engineering Pub Date : 2006-11-15 DOI: 10.1299/JSMEB.49.1056
M. Fuchiwaki, Kazuhiro Tanaka
{"title":"Vortex Structure and Scale on an Unsteady Airfoil","authors":"M. Fuchiwaki, Kazuhiro Tanaka","doi":"10.1299/JSMEB.49.1056","DOIUrl":"https://doi.org/10.1299/JSMEB.49.1056","url":null,"abstract":"In order to clarify vortex structures and vortex scales on an unsteady airfoil in a low Reynolds number region, we have visualized the flow around unsteady airfoils, such as a pitching airfoil and a heaving airfoil, at Re = 4000 using two visualization techniques, dye flow and schlieren visualizations. In particular, we focus on dynamic behaviors of vortices shed from a leading edge, the number of vortex sheddings and their scales. At a low nondimensional pitching rate in a pitching airfoil, a number of discrete vortices were shed from the leading edge and their scale was markedly small. At a high nondimensional pitching rate in a pitching airfoil, on the other hand, the number of vortex sheddings from the leading edge in one cycle was low. However, their scale was approximately one-fourth the chord length.","PeriodicalId":414195,"journal":{"name":"Jsme International Journal Series B-fluids and Thermal Engineering","volume":"82 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131674400","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
Thermal Hydraulic Performance of Tight Lattice Bundle 密格束的热水力性能
Jsme International Journal Series B-fluids and Thermal Engineering Pub Date : 2006-11-15 DOI: 10.1299/JSMEB.49.334
Yasushi Yamamoto, Miyuki Akiba, S. Morooka, K. Shirakawa, N. Abe
{"title":"Thermal Hydraulic Performance of Tight Lattice Bundle","authors":"Yasushi Yamamoto, Miyuki Akiba, S. Morooka, K. Shirakawa, N. Abe","doi":"10.1299/JSMEB.49.334","DOIUrl":"https://doi.org/10.1299/JSMEB.49.334","url":null,"abstract":"Recently, the reduced moderation spectrum BWR has been studied. The fast neutron spectrum is obtained through triangular tight lattice fuel. However, there are few thermal hydraulic test data and thermal hydraulic correlation applicable to critical power prediction in such a tight lattice bundle. This study aims to enhance the database of the thermal hydraulic performance of the tight lattice bundle whose rod gap is about 1mm. Therefore, thermal hydraulic performance measurement tests of tight lattice bundles for the critical power, the pressure drop and the counter current flow limiting were performed. Moreover, the correlations to evaluate the thermal-hydraulic performance of the tight lattice bundle were developed.","PeriodicalId":414195,"journal":{"name":"Jsme International Journal Series B-fluids and Thermal Engineering","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129549109","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: 11
Cavitation in a Two-Dimensional Nozzle and Liquid Jet Atomization : LDV Measurement of Liquid Velocity in a Nozzle 二维喷嘴内的空化与液体喷射雾化:喷嘴内液体速度的LDV测量
Jsme International Journal Series B-fluids and Thermal Engineering Pub Date : 2006-11-15 DOI: 10.1299/JSMEB.49.1253
Akira Sou, A. Tomiyama, S. Hosokawa, Shinji Nigorikawa, T. Maeda
{"title":"Cavitation in a Two-Dimensional Nozzle and Liquid Jet Atomization : LDV Measurement of Liquid Velocity in a Nozzle","authors":"Akira Sou, A. Tomiyama, S. Hosokawa, Shinji Nigorikawa, T. Maeda","doi":"10.1299/JSMEB.49.1253","DOIUrl":"https://doi.org/10.1299/JSMEB.49.1253","url":null,"abstract":"Cavitation in nozzles of liquid injectors is known to affect the atomization of a discharged liquid jet. To understand how cavitating flow in a nozzle enhances the liquid jet atomization, liquid velocity distribution of cavitating flow in a two-dimensional transparent nozzle was measured using a Laser Doppler Velocimetry (LDV) system. As a result, the following conclusions were obtained: (1) The inception of cavitation occurs near the outer edge of separated boundary layer (SBL), where the time-averaged local velocity takes the highest value and the time-averaged pressure is almost equal to the vapor saturation pressure. (2) When the cavitation number σ is greater than 0.78 (in no cavitation and developing cavitation regimes), the reattachment of SBL occurs in the middle of the nozzle. A large velocity fluctuation, which appears just downstream of SBL, decreases near the nozzle exit. Hence the wavy jet is formed in these regimes. (3) For σ < 0.65 (in super cavitation regime), the lateral flow directing from the core region toward the side walls just upstream of the nozzle exit is a major cause of the increase in the spray angle and drastic enhancement of liquid jet atomization. The strong turbulence just upstream of the exit must play an important role in the formation of ligaments on liquid jet interface.","PeriodicalId":414195,"journal":{"name":"Jsme International Journal Series B-fluids and Thermal Engineering","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133428137","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: 52
Numerical Simulation of Particle-Laden Plane Mixing Layer by Three-Dimensional Vortex Method 含颗粒平面混合层的三维涡法数值模拟
Jsme International Journal Series B-fluids and Thermal Engineering Pub Date : 2006-11-15 DOI: 10.1299/JSMEB.49.1027
H. Yagami, T. Uchiyama
{"title":"Numerical Simulation of Particle-Laden Plane Mixing Layer by Three-Dimensional Vortex Method","authors":"H. Yagami, T. Uchiyama","doi":"10.1299/JSMEB.49.1027","DOIUrl":"https://doi.org/10.1299/JSMEB.49.1027","url":null,"abstract":"A plane air mixing layer loaded with spherical glass particles is simulated by the three-dimensional vortex method proposed for gas-particle two-phase free turbulent flow by the authors in a prior study. The vortex method computes simultaneously the behavior of vortex element and the particle motion by the Lagrangian approach. It is demonstrated that the simulated particle distribution, mean velocity and fluctuating velocity agree with the measurement and that the vortex method is indeed applicable to the analysis of particle-laden plane mixing layer. The change in the vortical structure due to the loaded particles is also discussed.","PeriodicalId":414195,"journal":{"name":"Jsme International Journal Series B-fluids and Thermal Engineering","volume":"201 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129012501","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: 5
Laser Extinguishment of CH4-N2/Air Counterflow Diffusion Flame 激光扑灭CH4-N2/空气逆流扩散火焰
Jsme International Journal Series B-fluids and Thermal Engineering Pub Date : 2006-11-15 DOI: 10.1299/JSMEB.49.1336
H. Torikai, A. Kitajima, M. Takeuchi
{"title":"Laser Extinguishment of CH4-N2/Air Counterflow Diffusion Flame","authors":"H. Torikai, A. Kitajima, M. Takeuchi","doi":"10.1299/JSMEB.49.1336","DOIUrl":"https://doi.org/10.1299/JSMEB.49.1336","url":null,"abstract":"We have examined the laser extinguishment of a CH4-N2/Air counterflow diffusion flame. Laser extinguishment is to blow off flames by a laser-induced breakdown. A Q-switched Nd: YAG laser (energy; 200mJ/pulse) and a 100-mm focal-length lens were used. The laser-extinguishment probabilities were examined by varying the fuel concentration and the distance from the breakdown point to the flame. As a result, the two concentration limits were clarified. One was the laser extinguishable limit, below which the flame could be extinguished perfectly by laser. The other was the laser inextinguishable limit, over which any flame could not be extinguished. Moreover, it was considered that determination of the laser extinguishable limit was mainly influenced by the laser-induced blast wave. On the other hand, it could be considered that not only the blast wave but also hot gas and turbulence due to the optical breakdown influenced the determination of the laser inextinguishable limit.","PeriodicalId":414195,"journal":{"name":"Jsme International Journal Series B-fluids and Thermal Engineering","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127216781","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
On the Development of Coherent Structure in a Plane Jet: Part 4, The Multipoint Simultaneous Measurement of Two-Component Velocities and the Simple Coherent Structure Model 论平面射流相干结构的发展:第四部分，双分量速度的多点同时测量和简单相干结构模型
Jsme International Journal Series B-fluids and Thermal Engineering Pub Date : 2006-11-15 DOI: 10.1299/JSMEB.49.899
Nobuhiko Tanaka, Y. Sakai, M. Yamamoto, T. Kubo
{"title":"On the Development of Coherent Structure in a Plane Jet: Part 4, The Multipoint Simultaneous Measurement of Two-Component Velocities and the Simple Coherent Structure Model","authors":"Nobuhiko Tanaka, Y. Sakai, M. Yamamoto, T. Kubo","doi":"10.1299/JSMEB.49.899","DOIUrl":"https://doi.org/10.1299/JSMEB.49.899","url":null,"abstract":"To clarify the large-scale coherent structure in a turbulent plane jet, the simultaneous measurement of the main streamwise and the cross-streamwise velocity at 9 points in the self-preserving region of a turbulent plane jet has been performed using an array of X-type hot-wire probes. From the time variation of the main streamwise fluctuating velocity field, it is found that there exists a pair of fluid lumps with the positive and negative fluctuating velocity on opposite sides of the jet centerline. On the other hand, the instantaneous cross-streamwise fluctuating velocity shows the same sign over the cross section; i.e., a vertically striped pattern is formed. On the basis of the result of the Karhunen-Loeve (KL) expansion, a new interpretation of the coherent structure model in the self-preserving region of a turbulent plane jet has been given from the combination of \"flapping\" and \"puffing\".","PeriodicalId":414195,"journal":{"name":"Jsme International Journal Series B-fluids and Thermal Engineering","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131442091","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: 8
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