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Observation of detailed structure of turbulent pulverized-coal flame by optical measurement - (Part 1, time-averaged measurement of Behavior of pulverized-coal particles and flame structure) 用光学测量观察湍流煤粉火焰的详细结构。(第1部分:煤粉颗粒和火焰结构行为的时间平均测量)
Jsme International Journal Series B-fluids and Thermal Engineering Pub Date : 2006-11-15 DOI: 10.1299/JSMEB.49.1316
Seung-min Hwang, R. Kurose, F. Akamatsu, Hirofumi Tsuji, H. Makino, M. Katsuki
{"title":"Observation of detailed structure of turbulent pulverized-coal flame by optical measurement - (Part 1, time-averaged measurement of Behavior of pulverized-coal particles and flame structure)","authors":"Seung-min Hwang, R. Kurose, F. Akamatsu, Hirofumi Tsuji, H. Makino, M. Katsuki","doi":"10.1299/JSMEB.49.1316","DOIUrl":"https://doi.org/10.1299/JSMEB.49.1316","url":null,"abstract":"The purpose of this study is to elucidate of the primary air combustion zone in pulverized-coal combustion by means of advanced laser-based diagnostics with high temporal and spatial resolutions. An open-type burner is fabricated to apply various optical measurement techniques. Detailed and overall evaluation is performed by applying various optical measurement techniques to the flame, such as the velocity and shape of nonspherical pulverized-coal particles, temperature, and light emissions from a local point in the flame. It is observed that the particle mean diameter increases as the distance from the burner increases, and this is found to be caused by the decrease in the diameters of small particles and the increase in the diameters of large particles, which result in the char reaction and the particle swelling due to devolatilization, respectively. The size-classified streamwise velocities of pulverized-coal particles in the central region of the jet exhibit the same magnitude, whereas those in the outer region are different depending on the particle size. The behavior is well explained in terms of the particle inertia.","PeriodicalId":414195,"journal":{"name":"Jsme International Journal Series B-fluids and Thermal Engineering","volume":"3 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":"129391659","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: 39
On a Novel Diffuser for Efficient Automotive Catalytic Converters 一种新型高效汽车催化转化器扩散器的研究
Jsme International Journal Series B-fluids and Thermal Engineering Pub Date : 2006-11-15 DOI: 10.1299/JSMEB.49.1206
K. Hirata, M. Ota, Ryoji Oda, H. Tanigawa, J. Funaki
{"title":"On a Novel Diffuser for Efficient Automotive Catalytic Converters","authors":"K. Hirata, M. Ota, Ryoji Oda, H. Tanigawa, J. Funaki","doi":"10.1299/JSMEB.49.1206","DOIUrl":"https://doi.org/10.1299/JSMEB.49.1206","url":null,"abstract":"In automobile-exhaust systems, catalytic converters are main components and produce substantial pressure drops, which induce engine-power loss and fuel-consumption rise. On the other hand, catalytic converters are required for the uniformity of flow through a catalytic substrate, which causes uniformity of thermal distribution and high catalytic-conversion efficiency. The purpose of this study is to reduce the pressure losses and to improve the flow distribution simultaneously, under spatial constraints. The authors propose a new type of device and show its performance experimentally. Namely, the authors place a dome as a flow deflector inside the diffuser in front of a catalyst in order to suppress flow separation. The converter tested in the present study has a standard cylindrical ceramic substrate with a circular cross section. As a result, we present the optimum dome geometry that can reduce the pressure loss by 22% as compared to a no-dome converter.","PeriodicalId":414195,"journal":{"name":"Jsme International Journal Series B-fluids and Thermal Engineering","volume":"362 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":"115940166","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
Three-Dimensional Structure of Turbulent Flow in Mixing T-Junction 混合t型结湍流的三维结构
Jsme International Journal Series B-fluids and Thermal Engineering Pub Date : 2006-11-15 DOI: 10.1299/JSMEB.49.1070
M. Hirota, H. Asano, H. Nakayama, T. Asano, S. Hirayama
{"title":"Three-Dimensional Structure of Turbulent Flow in Mixing T-Junction","authors":"M. Hirota, H. Asano, H. Nakayama, T. Asano, S. Hirayama","doi":"10.1299/JSMEB.49.1070","DOIUrl":"https://doi.org/10.1299/JSMEB.49.1070","url":null,"abstract":"Experimental results on the turbulent mixing of hot and cold airflows in a T-junction are reported, which simulates the HVAC unit used in an automobile air conditioning system. Experiments are conducted keeping Reynolds number and temperature of the main flow at 2.5 × 10 4 and 12°C, respectively, and the velocity of the branch flow (60°C) is changed for three velocity ratios of 0.5, 1 and 2. The flow from the branch is separated at the edge of the T-junction and forms a large separation bubble. Longitudinal vortices are formed around this separation bubble, thus the flow field has a three-dimensional structure. In spite of such a complex flow field, the mean temperature in the thermal mixing layer shows quite uniform distributions in the spanwise direction, and the strong turbulence produced around the separation bubble does not work effectively to the thermal mixing of hot and cold airflows.","PeriodicalId":414195,"journal":{"name":"Jsme International Journal Series B-fluids and Thermal Engineering","volume":"13 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":"125263623","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: 20
Distortion of Compression Wave Propagating through Very Long Tunnel with Slab Tracks 超长平板轨道隧道中压缩波传播的畸变
Jsme International Journal Series B-fluids and Thermal Engineering Pub Date : 2006-11-15 DOI: 10.1299/JSMEB.49.1156
T. Fukuda, S. Ozawa, M. Iida, T. Takasaki, Y. Wakabayashi
{"title":"Distortion of Compression Wave Propagating through Very Long Tunnel with Slab Tracks","authors":"T. Fukuda, S. Ozawa, M. Iida, T. Takasaki, Y. Wakabayashi","doi":"10.1299/JSMEB.49.1156","DOIUrl":"https://doi.org/10.1299/JSMEB.49.1156","url":null,"abstract":"Field measurement and numerical simulation were performed on the distortion of the compression wave generated by train entry and propagating through a slab track Shinkansen tunnel, which is the longest mountain tunnel in the world as of 2004. The compression wave was measured at twelve different locations. In the numerical simulation, the distortion of the compression waveform were calculated by one-dimensional compressible flow analysis, which takes account of steady and unsteady friction, combined with acoustic analysis on the effect of side branches in the tunnel. The results of numerical simulation are consistent with those of the field measurement. Furthermore, the results indicate that the compression wavefront steepens in the early stage and smoothes down in the later stage of propagation, and the maximum value of the pressure gradient of the compression wavefront reaches a peak under certain conditions of the initial compression wave and a tunnel length.","PeriodicalId":414195,"journal":{"name":"Jsme International Journal Series B-fluids and Thermal Engineering","volume":"5 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":"133356852","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: 33
Optimization of Domestic-Size Renewable Energy System Designs Suitable for Cold Climate Regions 适合寒冷气候地区的国内规模可再生能源系统设计优化
Jsme International Journal Series B-fluids and Thermal Engineering Pub Date : 2006-11-15 DOI: 10.1299/JSMEB.49.1241
Itoro Etim Akpan, M. Sasaki, Noboru Endoh
{"title":"Optimization of Domestic-Size Renewable Energy System Designs Suitable for Cold Climate Regions","authors":"Itoro Etim Akpan, M. Sasaki, Noboru Endoh","doi":"10.1299/JSMEB.49.1241","DOIUrl":"https://doi.org/10.1299/JSMEB.49.1241","url":null,"abstract":"Five different kinds of domestic-size renewable energy system configurations for very cold climate regions were investigated. From detailed numerical modeling and system simulations, it was found that the consumption of fuel oil for the auxiliary boiler in residential-type households can almost be eliminated with a renewable energy system that incorporates photovoltaic panel arrays for electricity generation and two storage tanks: a well-insulated electric water storage tank that services the hot water loads, and a compact boiler/geothermal heat pump tank for room heating during very cold seasons. A reduction of Greenhouse Gas Emissions (GHG) of about 28% was achieved for this system compared to an equivalent conventional system. The near elimination of the use of fuel oil in this system makes it very promising for very cold climate regions in terms of energy savings because the running cost is not so dependent on the unstable nature of global oil prices.","PeriodicalId":414195,"journal":{"name":"Jsme International Journal Series B-fluids and Thermal Engineering","volume":"16 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":"132468067","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: 9
Flow around a Living Tree 绕着一棵树流动
Jsme International Journal Series B-fluids and Thermal Engineering Pub Date : 2006-11-15 DOI: 10.1299/JSMEB.49.1064
H. Ishikawa, S. Amano, Kenta Yakushiji
{"title":"Flow around a Living Tree","authors":"H. Ishikawa, S. Amano, Kenta Yakushiji","doi":"10.1299/JSMEB.49.1064","DOIUrl":"https://doi.org/10.1299/JSMEB.49.1064","url":null,"abstract":"Flow around a living tree was investigated as basic research of a windbreak forest. A type of conifer, which is named \"goldcrest,\" was used as the test piece in a wind tunnel experiment. The drag coefficient of the living tree was measured in the range of a mean flow velocity of 5∼15 m/s. The drag coefficient of the living tree was less than that of a two-dimensional circular cylinder. Because flow passes through the tree's crown which has the permeability of branches and leaves, the drag coefficient was decreased as the flow velocity was increased. Moreover, the flexibility is that the bole of a living tree also plays an important role in drag reduction, bending itself so as to decrease the projected area. In the wake behind the living tree, reverse flow was found at further downstream region than the case of a circular cylinder.","PeriodicalId":414195,"journal":{"name":"Jsme International Journal Series B-fluids and Thermal Engineering","volume":"6 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":"132691351","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: 17
Fundamental experiments and numerical analyses on heat transfer characteristics of a vapor chamber : (Effect of Heat Source Size) 蒸汽室换热特性的基础实验与数值分析:(热源尺寸的影响)
Jsme International Journal Series B-fluids and Thermal Engineering Pub Date : 2006-11-15 DOI: 10.1299/JSMEB.49.1233
Yasushi Koito, H. Imura, M. Mochizuki, Saito Yuji, S. Torii
{"title":"Fundamental experiments and numerical analyses on heat transfer characteristics of a vapor chamber : (Effect of Heat Source Size)","authors":"Yasushi Koito, H. Imura, M. Mochizuki, Saito Yuji, S. Torii","doi":"10.1299/JSMEB.49.1233","DOIUrl":"https://doi.org/10.1299/JSMEB.49.1233","url":null,"abstract":"A vapor chamber is used as a novel heat spreader to cool high-performance MPUs (microprocessor units). The vapor chamber is placed between small heat sources and a large heat sink. This paper describes the effect of heat source size on the heat transfer characteristics of the vapor chamber. First, by the experiments, the effect of heat source size on the temperature distribution of the vapor chamber is investigated, and the validity of the mathematical model of the vapor chamber is confirmed. Secondly, by the numerical analyses, the effect of heat source size on the thermal resistances inside the vapor chamber is discussed. It is found that the heat source size greatly affects the thermal resistance of the evaporator section inside the vapor chamber. Although the thermal resistance is hardly affected by the heat generation rate and the heat flux of the heat source, it increases as the heat source becomes smaller.","PeriodicalId":414195,"journal":{"name":"Jsme International Journal Series B-fluids and Thermal Engineering","volume":"30 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":"124629372","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: 38
Management of a Plane Turbulent Wall Jet by the Large-Eddy Break-up Device 大涡破碎装置对平面湍流壁面射流的管理
Jsme International Journal Series B-fluids and Thermal Engineering Pub Date : 2006-11-15 DOI: 10.1299/JSMEB.49.921
S. Mochizuki, S. Yamada, H. Osaka
{"title":"Management of a Plane Turbulent Wall Jet by the Large-Eddy Break-up Device","authors":"S. Mochizuki, S. Yamada, H. Osaka","doi":"10.1299/JSMEB.49.921","DOIUrl":"https://doi.org/10.1299/JSMEB.49.921","url":null,"abstract":"A Large Eddy Break-up (LEBU) device was applied to the flow management of a plane turbulent wall jet. The LEBU device was positioned at three different distances from the wall and the mean velocity, Reynolds shear stress profiles and wall shear stress were measured. The experimental data show that the LEBU device reduces the thickness of the shear layer and the magnitude of the Reynolds shear stress. The wall shear stress tends to be reduced even if the LEBU device is placed in the outer layer. These effects are most significant when the LEBU device is placed at the height at which the turbulent production term reaches its maximum. The length scale of the large eddies is reduced in manipulated flows, particularly in the spanwise direction.","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":"126063119","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
Power Augmentation Study of a Combined Cycle Power Plant Using Inlet Fogging 联合循环电厂进气雾化增功率研究
Jsme International Journal Series B-fluids and Thermal Engineering Pub Date : 2006-11-15 DOI: 10.1299/JSMEB.49.1272
Hsiao-Wei D. Chiang, Pai-Yi Wang
{"title":"Power Augmentation Study of a Combined Cycle Power Plant Using Inlet Fogging","authors":"Hsiao-Wei D. Chiang, Pai-Yi Wang","doi":"10.1299/JSMEB.49.1272","DOIUrl":"https://doi.org/10.1299/JSMEB.49.1272","url":null,"abstract":"The power output of gas turbines decreases as a result of increased ambient temperature. One way to recover the output loss is to cool the inlet air. In Taiwan, most gas turbines operate with combined cycle for base load. Only a small portion operates with simple cycle for peak load. Therefore, the power augmentation strategies for combined cycle power plants need to be studied in advance in order to recover the power loss due to increased ambient temperature in hot summer days. The objective of this research is to study the effects caused by adding an inlet fogging system to an existing gas turbine-based combined cycle plant. Moreover, this paper also includes a parametric study of plant performance with different effectiveness of the inlet fogging system based on the average ambient conditions. Results from this study can be used as a guideline for combined cycle power augmentation using inlet fogging.","PeriodicalId":414195,"journal":{"name":"Jsme International Journal Series B-fluids and Thermal Engineering","volume":"71 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":"116557673","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: 9
On the Turbulent Structures of Flows over a Traveling Wave Train 关于行波列车上流动的湍流结构
Jsme International Journal Series B-fluids and Thermal Engineering Pub Date : 2006-11-15 DOI: 10.1299/JSMEB.49.1181
Naoto Kihara, H. Hanazaki, T. Mizuya, H. Ueda
{"title":"On the Turbulent Structures of Flows over a Traveling Wave Train","authors":"Naoto Kihara, H. Hanazaki, T. Mizuya, H. Ueda","doi":"10.1299/JSMEB.49.1181","DOIUrl":"https://doi.org/10.1299/JSMEB.49.1181","url":null,"abstract":"Characteristics of the airflow over a train of waves moving at a constant speed are investigated using a direct numerical simulation. We simulate the flow for various wave ages (c/u * = 0, 4, 8, 10, 12, 16 and 20), where c is the phase speed of the wind wave and u * is the friction velocity on the wave surface. The results show that both the mean flow profiles and the turbulent statistics depend strongly on the wave age. For example, the mean-flow speed in the log layer generally decreases at small wave ages, i.e., when the wave- growth rate is positive. Vertical profiles of the flow change significantly at the critical height z c , where the mean flow speed and the wave speed c agree. Then, the wave-induced vertical flux of the horizontal momentum is positive below z c , decreases rapidly near z c , and becomes negative above z c .","PeriodicalId":414195,"journal":{"name":"Jsme International Journal Series B-fluids and Thermal Engineering","volume":"38 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":"132590966","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
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