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Performance Prediction on a Partially Admitted Small Axial-Type Turbine 部分进气小型轴流式水轮机性能预测
Jsme International Journal Series B-fluids and Thermal Engineering Pub Date : 2006-11-15 DOI: 10.1299/JSMEB.49.1290
Soo-Yong Cho, C. Cho, Chae-sil Kim
{"title":"Performance Prediction on a Partially Admitted Small Axial-Type Turbine","authors":"Soo-Yong Cho, C. Cho, Chae-sil Kim","doi":"10.1299/JSMEB.49.1290","DOIUrl":"https://doi.org/10.1299/JSMEB.49.1290","url":null,"abstract":"A performance prediction model is developed for axial-type turbines that operate at partial admission. Losses generated within the turbine are classified into windage loss, expansion loss and mixing loss. This developed loss model is compared with an experimental result when a turbine operates with a rectangular-type nozzle at a partial admission rate from 22% to 37%. The present predicted results show better agreement with the experimental results than with those predicted by other models, as the expansion loss in this model is developed more closely to the real flow situation. If a turbine operates at a very low partial admission rate, a circular-type nozzle is more efficient than a rectangular-type nozzle. In this case, a performance prediction model is developed and an experiment is conducted with the circular-type nozzle. The predicted result is compared with the measured performance, and the developed model is found to be in good agreement with the experimental results. Thus, the developed model could be applied to predict the performance of axial-type turbines that operate at various partial admission rates or with different nozzle shapes.","PeriodicalId":414195,"journal":{"name":"Jsme International Journal Series B-fluids and Thermal Engineering","volume":"517 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":"133336477","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: 35
Study of Active Jet Control by Acoustically Driven Secondary Film Flow Influence of Velocity Ratio and Acoustic Strouhal Number 声驱动二次膜流主动射流控制研究速度比和声斯特罗哈尔数的影响
Jsme International Journal Series B-fluids and Thermal Engineering Pub Date : 2006-11-15 DOI: 10.1299/JSMEB.49.974
N. Miyagi, Kohei Hodoya, H. Fujita, H. Shoji, M. Kimura
{"title":"Study of Active Jet Control by Acoustically Driven Secondary Film Flow Influence of Velocity Ratio and Acoustic Strouhal Number","authors":"N. Miyagi, Kohei Hodoya, H. Fujita, H. Shoji, M. Kimura","doi":"10.1299/JSMEB.49.974","DOIUrl":"https://doi.org/10.1299/JSMEB.49.974","url":null,"abstract":"Active control of the diffusion of a circular jet was attempted by application of a secondary film flow around the jet. Sinusoidal acoustic excitation of the film flow was carried out for VR values of 0.5 and 1.0, where VR is the ratio of the film flow velocity to the main jet velocity. For VR = 0.5, the diffusion of the jet was suppressed compared to that of a single jet but it was somewhat enhanced by the acoustic excitation. The acoustic excitation shortened the potential core of the jet; however, the entrainment of the ambient flow was far less than in the case of a single jet, regardless of degree of excitation. For VR = 1.0, diffusion was enhanced by acoustic excitation. Both turbulence intensity and ambient flow entrainment increased downstream of the jet. We conclude that film flow can control diffusion and that acoustic excitation can enhance the diffusion of jet flows. It is worth investigating this mechanism in detail in future studies.","PeriodicalId":414195,"journal":{"name":"Jsme International Journal Series B-fluids and Thermal Engineering","volume":"9 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":"131831394","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
Flow Analysis for Single and Multi-Nozzle Jet Pump 单喷嘴和多喷嘴喷射泵的流量分析
Jsme International Journal Series B-fluids and Thermal Engineering Pub Date : 2006-11-15 DOI: 10.1299/JSMEB.49.933
T. Narabayashi, Yukitaka Yamazaki, Hidetoshi Kobayashi, T. Shakouchi
{"title":"Flow Analysis for Single and Multi-Nozzle Jet Pump","authors":"T. Narabayashi, Yukitaka Yamazaki, Hidetoshi Kobayashi, T. Shakouchi","doi":"10.1299/JSMEB.49.933","DOIUrl":"https://doi.org/10.1299/JSMEB.49.933","url":null,"abstract":"Jet pumps, driven by a Primary-Loop Recirculation (PLR) Pump, have been widely used in Boiling Water Reactor (BWR) plants to recirculate the reactor core coolant. A jet pump consists of a driving nozzle, a bell-mouth, a throat and a diffuser. The improvement of the jet pump efficiency for BWR plants brings an economic advantage because it reduces the operating power cost of the PLR pump. In order to improve the efficiency of the BWR jet pump, a 1/5 scale jet pump test loop for BWR plant was used and intensive tests were conducted focusing on the types of driving nozzles and shapes of the throat. These test data were used for CFD flow analysis code verification. The analytical data showed good agreement with the test results. After the analytical model verification, improvement of jet pump efficiency was conducted. It was shown by the CFD analysis that the peak efficiency of the improved jet pump will be 36% with the tapered throat.","PeriodicalId":414195,"journal":{"name":"Jsme International Journal Series B-fluids and Thermal Engineering","volume":"9 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":"134321574","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: 27
Effects of Shaft Vibration on Occurrence of Asymmetric Cavitation in Inducer 轴振对诱导轮非对称空化产生的影响
Jsme International Journal Series B-fluids and Thermal Engineering Pub Date : 2006-11-15 DOI: 10.1299/JSMEB.49.1220
Satoshi Kobayashi
{"title":"Effects of Shaft Vibration on Occurrence of Asymmetric Cavitation in Inducer","authors":"Satoshi Kobayashi","doi":"10.1299/JSMEB.49.1220","DOIUrl":"https://doi.org/10.1299/JSMEB.49.1220","url":null,"abstract":"In the present study, I investigate the effects of shaft vibration on asymmetric cavitation, which is one of the instability phenomena on cavitating 3-bladed inducers. Inducer tests under various unbalance conditions are performed to clarify the effects of shaft vibration. The following results are obtained. (1) The amplitude of shaft vibration has a strong effect on the occurrence of asymmetric cavitation, and in an inducer with a large vibration amplitude, asymmetric cavitation easily occurs. (2) The phase of the small-tip clearance caused by shaft vibration coincides with the position of the small cavity. In this study, it is shown that suppression of shaft vibration amplitude is extremely important in preventing harmful asymmetric cavitation.","PeriodicalId":414195,"journal":{"name":"Jsme International Journal Series B-fluids and Thermal Engineering","volume":"22 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":"132383642","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: 12
Three-Dimensional Flow Measurement by Digital Holographic Particle Image Velocimetry with Spatio-Temporal Derivative Method 基于时空导数法的数字全息粒子图像测速三维流量测量
Jsme International Journal Series B-fluids and Thermal Engineering Pub Date : 2006-11-15 DOI: 10.1299/JSMEB.49.1133
Takahiro Yamaguchi, S. Murata, Takafumi Morihara
{"title":"Three-Dimensional Flow Measurement by Digital Holographic Particle Image Velocimetry with Spatio-Temporal Derivative Method","authors":"Takahiro Yamaguchi, S. Murata, Takafumi Morihara","doi":"10.1299/JSMEB.49.1133","DOIUrl":"https://doi.org/10.1299/JSMEB.49.1133","url":null,"abstract":"In this paper, we present a digital holographic particle image velocimetry (DHPIV) technique with a spatio-temporal derivative method for velocity measurement in 3D space and the results of evaluating on its measurement accuracy. In this technique, hologram patterns are observed as digital images using an electronic camera, such as CCD or CMOS, and image reconstruction is carried out on a personal computer. Since an in-line observation system is utilized in conventional digital holography, a numerically reconstructed image is considerably enlarged in the depth direction and its depth resolution is extremely low; hence, the measurement accuracy in the depth direction is inaccurate in a digital holographic measurement. To overcome this difficulty, we apply a spatio-temporal derivative method to this technique for the detection of particle displacement along the z-axis. In a numerical simulation, measurement accuracy is evaluated for a multi particle model and a cubic cavity flow model. Furthermore, we examine the effect of noise on displacement measurement accuracy for numerically constructed noisy hologram patterns.","PeriodicalId":414195,"journal":{"name":"Jsme International Journal Series B-fluids and Thermal Engineering","volume":"31 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":"133837616","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: 15
A Study on Characteristics of Under-Expanded Condensing Jet 欠膨胀冷凝射流特性研究
Jsme International Journal Series B-fluids and Thermal Engineering Pub Date : 2006-11-15 DOI: 10.1299/JSMEB.49.1165
Y. Otobe, S. Matsuo, Masanori Tanaka, H. Kashimura, T. Setoguchi
{"title":"A Study on Characteristics of Under-Expanded Condensing Jet","authors":"Y. Otobe, S. Matsuo, Masanori Tanaka, H. Kashimura, T. Setoguchi","doi":"10.1299/JSMEB.49.1165","DOIUrl":"https://doi.org/10.1299/JSMEB.49.1165","url":null,"abstract":"The single supersonic free jet discharging from a nozzle or an orifice has been often employed in various industrial processes. A number of studies have been done on the major features (Mach disk, barrel shock wave and the jet boundary configuration) of the supersonic jets. In the present study, numerical computations were performed to investigate the effect of initial degree of supersaturation of moist air at reservoir condition on under-expanded jet structures and the total pressure loss behind the Mach disk. From these studies, it was found that the position of Mach disk in the under-expanded moist air jets was almost the same as that in dry air jets. However, the diameter of Mach disk increased slightly with an increase in the initial degree of supersaturation of moist air. Furthermore, the total pressure loss behind the Mach disk of moist air jet changed largely in comparison to that of dry air jet.","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":"125403917","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: 14
Mixing Characteristics of Multijet Modified by Cyclic Perturbation 循环扰动对多射流混合特性的影响
Jsme International Journal Series B-fluids and Thermal Engineering Pub Date : 2006-11-15 DOI: 10.1299/JSMEB.49.959
K. Tatsumi, E. Shinohara, Fumitoshi Okamoto, Y. Kitaoka, K. Nakabe
{"title":"Mixing Characteristics of Multijet Modified by Cyclic Perturbation","authors":"K. Tatsumi, E. Shinohara, Fumitoshi Okamoto, Y. Kitaoka, K. Nakabe","doi":"10.1299/JSMEB.49.959","DOIUrl":"https://doi.org/10.1299/JSMEB.49.959","url":null,"abstract":"The effect of cyclic perturbation on the mixing performance of millimeter-sized multiple air jets was investigated using flow visualization, hot-wire anemometry and laser Doppler anemometry techniques. Two types of external perturbation method were used, i.e., adding an acoustic sound and applying a pulsating flow to the jet. External acoustic sounds were found to be an additional dominant factor for the jet mixing, and in the multiple-jet case, the main jet located in the middle between the two same-sized jets was split into two, entrained into the neighboring jets, and eventually merged into one developed flow. For the pulsating-jet case, depending on the phase in one cycle, the jet flow condition alternately changed between laminar and turbulent. This affected the time-mean values of the jet flow profile. An adverse change in the mixing performance at the locations near the nozzle and far downstream was obtained between the pulsating- and steady-jet cases.","PeriodicalId":414195,"journal":{"name":"Jsme International Journal Series B-fluids and Thermal Engineering","volume":"40 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":"122651118","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
Pulsating Flows: Experimental Equipment and Its Application 脉动流:实验设备及其应用
Jsme International Journal Series B-fluids and Thermal Engineering Pub Date : 2006-11-15 DOI: 10.1299/JSMEB.49.980
B. Ünsal, F. Durst
{"title":"Pulsating Flows: Experimental Equipment and Its Application","authors":"B. Ünsal, F. Durst","doi":"10.1299/JSMEB.49.980","DOIUrl":"https://doi.org/10.1299/JSMEB.49.980","url":null,"abstract":"Investigations of time-dependent laminar and transitional flows need accurate and reproducible generation of the flow as a function of time. For this purpose, an electronically controlled air valve, with which the mass flow rate is controlled, was designed and built. The working principle and lay-out of the valve are explained and the performance of the valve is demonstrated. It was found that with the present equipment one can study any non-periodic and periodic flow and the flow can be adjusted to be laminar, transitional and turbulent. The investigations on laminar and transitional time-dependent flows are reported. Laminar flow investigations showed that the generated sinusoidal mass flow rates agree well with that of analytical solution. Non-periodic transient and periodic sinusoidal pulsatile transitional flows were investigated. It was shown that elucidation of the transition in non-periodic transient flows may help in understanding the transition in periodic flows.","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":"124476417","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
A study on time-resolved laser induced incandescence analysis method for the measurement of primary particle size in diesel exhaust 时间分辨激光诱导白炽灯分析方法测定柴油机尾气中初级颗粒粒径的研究
Jsme International Journal Series B-fluids and Thermal Engineering Pub Date : 2006-11-15 DOI: 10.1299/JSMEB.49.1351
Jong-il Park, Hoonchul Ryoo, Hong-Sik Chun, Soonho Song, J. Hahn, K. Chun
{"title":"A study on time-resolved laser induced incandescence analysis method for the measurement of primary particle size in diesel exhaust","authors":"Jong-il Park, Hoonchul Ryoo, Hong-Sik Chun, Soonho Song, J. Hahn, K. Chun","doi":"10.1299/JSMEB.49.1351","DOIUrl":"https://doi.org/10.1299/JSMEB.49.1351","url":null,"abstract":"A simple correlation between particle size and the time-resolved laser induced incandescence signal is introduced and applied to a diesel engine for the measurement of primary particle size in the raw exhaust gas. The measurements from time-resolved LII signal are calibrated for all experimental conditions using Transmission Electron Microscope photographs to investigate the differences between particle size from TEM photographs and that estimated by LII. An evaluation of uncertainty in the LII measurements is also presented. From the comparison between the two measurements and uncertainty analysis, it can be concluded that the time-resolved LII theory employed in this study can be used as a useful tool for measuring primary particle size in engine exhaust since the measurements from LII are reliable and in a good agreement with those from TEM imaging. From a practical point of view, the strategy for particle size measurements presented here are simple and straightforward in its application.","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":"121178186","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: 7
Numerical Analysis of Control of Flow Oscillations in Open Cavity Using Moving Bottom Wall 动底壁控制开腔内流动振荡的数值分析
Jsme International Journal Series B-fluids and Thermal Engineering Pub Date : 2006-11-15 DOI: 10.1299/JSMEB.49.1098
Takashi Yoshida, Takashi Watanabe, T. Ikeda, S. Iio
{"title":"Numerical Analysis of Control of Flow Oscillations in Open Cavity Using Moving Bottom Wall","authors":"Takashi Yoshida, Takashi Watanabe, T. Ikeda, S. Iio","doi":"10.1299/JSMEB.49.1098","DOIUrl":"https://doi.org/10.1299/JSMEB.49.1098","url":null,"abstract":"In this study, we investigate the active control of self-sustained oscillating flow over an open cavity using a moving bottom wall. The incompressible Navier-Stokes equations are solved using finite difference methods for the two-dimensional cavity with laminar boundary layer upstream. We move the cavity bottom wall tangentially with nondimensional velocities ranging from -0.2 to +0.2. The results show that wall velocity changes the characteristics of recirculating flow in the cavity and that the modification of recirculating flow plays an important role in changing the oscillation characteristics of the separated shear layer. When the wall velocity is less than -0.1, two recirculating vortices change to one clockwise recirculating vortex in the cavity, so that the self-excited shear layer oscillations are completely suppressed. When the wall velocity is more than +0.19, two stationary vortices exist on the upper side and lower side of the cavity and the self-excited shear layer oscillations are suppressed.","PeriodicalId":414195,"journal":{"name":"Jsme International Journal Series B-fluids and Thermal Engineering","volume":"72 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":"121458539","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
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