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Jsme International Journal Series B-fluids and Thermal Engineering最新文献

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Aeroacoustics of Turbulent Jets: Flow Structure, Noise Sources, and Control 紊流射流的气动声学:流动结构、噪声源与控制
Jsme International Journal Series B-fluids and Thermal Engineering Pub Date : 2006-11-15 DOI: 10.1299/JSMEB.49.1078
E. Gutmark, B. Callender, S. Martens
{"title":"Aeroacoustics of Turbulent Jets: Flow Structure, Noise Sources, and Control","authors":"E. Gutmark, B. Callender, S. Martens","doi":"10.1299/JSMEB.49.1078","DOIUrl":"https://doi.org/10.1299/JSMEB.49.1078","url":null,"abstract":"The paper reviews research performed to advance the understanding of state-of-the-art technologies capable of reducing coaxial jet noise simulating the exhaust flow of turbofan engines. The review focuses on an emerging jet noise passive control technology known as chevron nozzles. The fundamental physical mechanisms responsible for the acoustic benefits provided by these nozzles are discussed. Additionally, the relationship between these physical mechanisms and some of the primary chevron geometric parameters are highlighted. Far-field acoustic measurements over a wide range of nozzle operating conditions illustrated the ability of the chevron nozzles to provide acoustic benefits. Detailed mappings of the acoustic near-field provided more insight into the chevron noise suppression mechanisms by successfully identifying two primary chevron effects consistent with the results of the far-field measurements: chevrons penetration and shear velocity across them. Mean and turbulence data identified the physical flow mechanisms responsible for the effects documented in the far- and near-field studies.","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":"114180156","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: 16
Effect of Surface Roughness on Jet Pump Performance 表面粗糙度对喷射泵性能的影响
Jsme International Journal Series B-fluids and Thermal Engineering Pub Date : 2006-11-15 DOI: 10.1299/JSMEB.49.928
Yukitaka Yamazaki, Tomonori Nakayama, T. Narabayashi, Hidetoshi Kobayashi, T. Shakouchi
{"title":"Effect of Surface Roughness on Jet Pump Performance","authors":"Yukitaka Yamazaki, Tomonori Nakayama, T. Narabayashi, Hidetoshi Kobayashi, T. Shakouchi","doi":"10.1299/JSMEB.49.928","DOIUrl":"https://doi.org/10.1299/JSMEB.49.928","url":null,"abstract":"The jet pump generally needs a long throat to mix the driving and induced fluids and transfer the momentum of driving fluid to induced fluid. Simultaneously, the energy loses when the fluids flow through the long throat because the friction loss occurs inside of the throat wall. Therefore, it is known that the throat length largely affects the jet pump efficiency. In this study, experimental studies are performed for a typical single nozzle jet pump using water at room temperature. It is revealed that surface roughness located nearer the throat inlet has a greatest effect on the jet pump efficiency because the local skin friction coefficient nearest the throat inlet is the largest. The best efficiency and its flow rate ratio decrease linearly as surface roughness increases. The frictional resistance coefficient in the throat for each roughness is made clear by fitting a one-dimensional theoretical prediction equation to the experimental results.","PeriodicalId":414195,"journal":{"name":"Jsme International Journal Series B-fluids and Thermal Engineering","volume":"17 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":"125327161","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: 13
Recent progress on monotone integrated large eddy simulation of free jets 自由射流单调积分大涡模拟研究进展
Jsme International Journal Series B-fluids and Thermal Engineering Pub Date : 2006-11-15 DOI: 10.1299/JSMEB.49.890
F. Grinstein
{"title":"Recent progress on monotone integrated large eddy simulation of free jets","authors":"F. Grinstein","doi":"10.1299/JSMEB.49.890","DOIUrl":"https://doi.org/10.1299/JSMEB.49.890","url":null,"abstract":"Large Eddy Simulation (LES) of shear flows driven by Kelvin-Helmholtz instabilities such as mixing layers, wakes, and jets is of great interest because of their crucial role in many practical applications. The Monotone Integrated LES (MILES) approach is motivated here for these studies, and the basic components involved in a typical MILES jet model are described. Examples from MILES jet studies are used to address major aspects of transition to turbulence from laminar conditions at the nozzle exit including, the occurrence of global instabilities, complex three-dimensional vorticity geometries, and their impact on jet entrainment. Quantitative analysis of the small-scale features of the transitioning simulated jets is presented, and convergence issues are addressed in this context.","PeriodicalId":414195,"journal":{"name":"Jsme International Journal Series B-fluids and Thermal Engineering","volume":"165 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":"121781411","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: 18
Heat Transfer from an Inflow-Type Swirling Turbulent Impinging Jet 流入型旋转湍流撞击射流的热传递
Jsme International Journal Series B-fluids and Thermal Engineering Pub Date : 2006-11-15 DOI: 10.1299/JSMEB.49.995
K. Ichimiya, K. Tsukamoto
{"title":"Heat Transfer from an Inflow-Type Swirling Turbulent Impinging Jet","authors":"K. Ichimiya, K. Tsukamoto","doi":"10.1299/JSMEB.49.995","DOIUrl":"https://doi.org/10.1299/JSMEB.49.995","url":null,"abstract":"Heat transfer characteristics of a circular turbulent impinging jet with a swirl were experimentally examined using air as a working fluid. A swirl was produced by inserting air from two exits on the side surface of a circular nozzle. The flow was visualized by a smoke-inducing method. Impingement surface temperature was measured using thermosensitive liquid crystal by transforming from color to temperature. Local heat transfer has two peaks due to the inserting angle. The swirl enhanced the impingement heat transfer, which was arranged by the ratio of circumferential momentum and axial momentum, within the present conditions.","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":"133781685","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: 18
Simultaneous Heat and Moisture Transfer Investigation for a Packed Agricultural Particle Pile Bed 填料农业颗粒桩床热湿同步传递特性研究
Jsme International Journal Series B-fluids and Thermal Engineering Pub Date : 2006-11-15 DOI: 10.1299/JSMEB.49.1226
R. Chen
{"title":"Simultaneous Heat and Moisture Transfer Investigation for a Packed Agricultural Particle Pile Bed","authors":"R. Chen","doi":"10.1299/JSMEB.49.1226","DOIUrl":"https://doi.org/10.1299/JSMEB.49.1226","url":null,"abstract":"As one kind of hygroscopic salts, bulk potash particle easily absorbs water vapor during storage and transportation process to form serious caking. The accumulation and movement of moisture is demonstrated to change with temperature. In this paper, a set of appropriate equations has been presented to formulate a mathematical model of coupled moisture and heat migration in thin pile beds of storage potash particle, assuming moisture diffusion and heat conduction as dominant transport mechanism. The numerical model is validated by comparison of numerical simulation results with experimental data from literature. Then the model is used as a reliable predictive tool to explore the moisture and heat migration for a packed potash bed with average particle size 3.66mm. The sensitivity analysis presents the influence of the variation of effective thermal conductivity and effective diffusion coefficient.","PeriodicalId":414195,"journal":{"name":"Jsme International Journal Series B-fluids and Thermal Engineering","volume":"51 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":"132867090","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
Acoustic Wave Generation in a Compressible Wake 可压缩尾流中声波的产生
Jsme International Journal Series B-fluids and Thermal Engineering Pub Date : 2006-11-15 DOI: 10.1299/JSMEB.49.1086
H. Maekawa, T. Takiguchi, Daisuke Watanabe
{"title":"Acoustic Wave Generation in a Compressible Wake","authors":"H. Maekawa, T. Takiguchi, Daisuke Watanabe","doi":"10.1299/JSMEB.49.1086","DOIUrl":"https://doi.org/10.1299/JSMEB.49.1086","url":null,"abstract":"The compressible Navier-Stokes equations are numerically solved to study the acoustic generation mechanism associated with the evolution of the structure in a compressible plane wake undergoing transition to turbulence. High-order compact finite difference schemes are used for spatial derivatives and a 4th-order Runge-Kutta scheme is employed for time advancement. Navier-Stokes characteristic boundary conditions are used in the vertical direction and periodic boundary conditions in the streamwise and spanwise directions. Three-dimensional structures of the wake are studied by means of temporally evolving plane wakes forced with a combination of unstable modes obtained from linear stability theory using a mapped Fourier method for the viscous compressible equations. Forcing with a pair of oblique subharmonic unstable modes yields streamwise/vertical counter- rotating vortices in the saddle region. As the streamwise/vertical vortices evolve outside, their self-induction causes inclined braidlike structures to form in the wake, which are similar to observations in the experimental supersonic flat wake transition. The oblique subharmonic unstable modes also cause the spanwise variations in the core that lead to roller distortion. Acoustic waves of plane wakes are generated when two-dimensional rollup structures appear and rotate in such wakes. Near-field sound wave pressure decreases downstream due to the three-dimensional evolution of the wake.","PeriodicalId":414195,"journal":{"name":"Jsme International Journal Series B-fluids and Thermal Engineering","volume":"335 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":"124304617","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
Measurement of Averaged Liquid Velocity Field around Large Bubbles Rising in Stagnant Water in Round Pipe Using UVP 用UVP测量圆管内滞水上升大气泡周围平均液速场
Jsme International Journal Series B-fluids and Thermal Engineering Pub Date : 2006-11-15 DOI: 10.1299/JSMEB.49.1173
H. Minagawa, T. Fukazawa, Y. Nakazawa, S. Yamada, Y. Shiomi
{"title":"Measurement of Averaged Liquid Velocity Field around Large Bubbles Rising in Stagnant Water in Round Pipe Using UVP","authors":"H. Minagawa, T. Fukazawa, Y. Nakazawa, S. Yamada, Y. Shiomi","doi":"10.1299/JSMEB.49.1173","DOIUrl":"https://doi.org/10.1299/JSMEB.49.1173","url":null,"abstract":"An ultrasonic velocity profile monitor (UVP) measurement was performed to measure the average liquid velocity field around a large bubble rising in stagnant water in a round pipe of inner diameter D=54mm in order to obtain fundamental information for gas-liquid two-phase slug flows. Two ultrasonic transducers were set at different directions to obtain velocity vectors. The measured results are presented and compared with the results of some previous studies on the corresponding phenomena. In the liquid film near the bubble nose, the difference in bubble length does not affect the acceleration. The parameter z/D is more dominant than z itself, particularly when z/D is less than unity. In the wake region, a large ring vortex is recognized. The upward velocity at the pipe axis agrees well with previously predicted results. The effect of bubble length on the vortex length is also discussed.","PeriodicalId":414195,"journal":{"name":"Jsme International Journal Series B-fluids and Thermal Engineering","volume":"19 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":"132165265","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
Growth of disturbance wave induced by radial liquid sheet instability 径向液片不稳定引起的扰动波的增长
Jsme International Journal Series B-fluids and Thermal Engineering Pub Date : 2006-11-15 DOI: 10.1299/JSMEB.49.1022
T. Wakimoto, T. Azuma
{"title":"Growth of disturbance wave induced by radial liquid sheet instability","authors":"T. Wakimoto, T. Azuma","doi":"10.1299/JSMEB.49.1022","DOIUrl":"https://doi.org/10.1299/JSMEB.49.1022","url":null,"abstract":"The growth and three-dimensional deformation of a disturbance wave in the laminar-turbulent transition of a radial liquid sheet flow are studied. The radial liquid sheet is formed by the release of a radial liquid film flowing on a disk from the edge of the disk to still air. When the Reynolds number is large, a concentric disturbance wave appears and grows downstream on the free surfaces of the liquid sheet. The disturbance wave is induced by an unstable disturbance attributed to an inflectional velocity profile inside the liquid sheet. The detailed observation of a disturbance wave excited by a supersonic wave reveals the growth and three-dimensional deformation of the disturbance wave.","PeriodicalId":414195,"journal":{"name":"Jsme International Journal Series B-fluids and Thermal Engineering","volume":"11 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":"121495579","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
Toward Smart Control of Turbulent Jet Mixing and Combustion 湍流射流混合燃烧智能控制研究
Jsme International Journal Series B-fluids and Thermal Engineering Pub Date : 2006-11-15 DOI: 10.1299/JSMEB.49.941
N. Kasagi
{"title":"Toward Smart Control of Turbulent Jet Mixing and Combustion","authors":"N. Kasagi","doi":"10.1299/JSMEB.49.941","DOIUrl":"https://doi.org/10.1299/JSMEB.49.941","url":null,"abstract":"Recent progress in active control of jet mixing and combustion is introduced. Miniature electromagnetic flap actuators are mounted on the periphery of an axisymmetric nozzle exit. It is demonstrated that even weak disturbances introduced into the initial shear layer by these actuators can significantly modify the large-scale vortical structures. This control technique is extended to the control of methane/air mixing and diffusion combustion by using a coaxial jet nozzle with the same flap actuators. As a result, the flame characteristics can be much improved in terms of stability and emission. Direct numerical simulation of a confined coaxial jet control has also been carried out. Although the distributed actuators are modeled somewhat ideally, DNS clearly demonstrates enormous effects of the present control scheme on the initial shear layer dynamics and concentration mixing.","PeriodicalId":414195,"journal":{"name":"Jsme International Journal Series B-fluids and Thermal Engineering","volume":"73 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":"115921616","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: 21
Improvement of Aerodynamic Performance of the Aero-Train by Controlling Wing-Wing Interaction Using Single-Slotted Flap 利用单开槽襟翼控制翼-翼相互作用改善气动列车气动性能
Jsme International Journal Series B-fluids and Thermal Engineering Pub Date : 2006-11-15 DOI: 10.1299/JSMEB.49.1118
D. Yoon, Y. Kohama, S. Kikuchi, Takuma Kato
{"title":"Improvement of Aerodynamic Performance of the Aero-Train by Controlling Wing-Wing Interaction Using Single-Slotted Flap","authors":"D. Yoon, Y. Kohama, S. Kikuchi, Takuma Kato","doi":"10.1299/JSMEB.49.1118","DOIUrl":"https://doi.org/10.1299/JSMEB.49.1118","url":null,"abstract":"Aero-train is a new driving concept using aerodynamic technology under development by the Kohama Laboratory, Institute of Fluid Science, Tohoku University. It employs the wing-in-ground effect to enable travel at high speeds over land. Aero-train makes use of the ground effects of lift and side force between the wings and a U-shaped guideway for stability. The main wings have vertical wings at the tips, which are arranged in tandem to regulate the roll and yaw stability in the U-shaped guideway. However, the vertical wings deteriorate the lift-to-drag ratio of the Aero-train by aerodynamic interaction with the main wings. The present study was performed to improve the aerodynamic performance of the Aero-train by controlling wing-wing interaction. Installation of a single-slotted flap on the wings considerably improved the aerodynamic performance of the wings.","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":"129438935","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: 4
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