Faculty Profiles - Suzuki Hiroki

Papers - Suzuki Hiroki

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Fundamental Study on the Temporal Variation of CTA Calibration Curves Reviewed

Hiroki Suzuki, Shinsuke Mochizuki, Yutaka Hasegawa

Proceedings of the 10th International Symposium on Advanced Science and Technology in Experimental Mechanics Paper No.A112 - (6 pages) 2015.11

Research of electric power regeneration using automotive cooling fan (Influence of wind turbine on air resistance through vehicle cooling system) Reviewed

Shinichi Oda, Yutaka Hasegawa, Hiroki Suzuki, Tatsuo Ushijima, Hideki Ooya

Transactions of the JSME (in Japanese) 81 ( 830 ) 14-00169 - (16 pages) 2015.9

Language：English Publishing type：Research paper (scientific journal) Publisher：The Japan Society of Mechanical Engineers

This work aims at developing a new fan-turbine that operates as a cooling fan at a low vehicle speed and operates as a wind turbine at a high vehicle speed to generate electric power. The present paper reports the influence of a wind turbine on air resistance through a vehicle cooling system. We have developed a method to measure air resistance by using a general-purpose facility and the following results have been provided. The wind turbine operation reduces air resistance through the cooling system and regenerates electric power simultaneously. Furthermore we have confirmed the influence of the wind turbine on air resistance through the vehicle cooling system by using a CFD analysis.

DOI： 10.1299/transjsme.14-00691

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Research of electric power regeneration using automotive cooling fan (Enhancement of wind turbine power by installing high solidity rotor on vehicle) Reviewed

Shinichi Oda, Yutaka Hasegawa, Hiroki Suzuki, Tatsuo Ushijima, Hideki Ooya

Transactions of the JSME (in Japanese) 81 ( 829 ) 15-00042 - (12 pages) 2015.8

Language：English Publishing type：Research paper (scientific journal) Publisher：The Japan Society of Mechanical Engineers

This work aims at developing a new cooling fan for vehicle engine. This fan can operate as a cooling fan at low vehicle speed. At high vehicle speed, however, the fan is rarely used as a cooling fan. Therefore the fan can be used as a wind turbine, which generates electric power. In the previous report we had confirmed the effect of S-Shaped blade profile on the wind turbine efficiency by CFD analysis and the experiments. The present paper reports the enhancement of wind turbine power by installing high solidity rotor on a vehicle. High solidity rotor can increase the wind turbine efficiency and receive more input power due to the increased rate of the rotor resistance to the total resistance through the cooling system, although the air flow rate through the system decreases. We confirmed by the estimation and the actual vehicle test that the high solidity rotor can regenerate more electric power than the original low solidity rotor.

DOI： 10.1299/transjsme.15-00042

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Research of electric power regeneration using automotive cooling fan (Improvement of wind turbine efficiency by high solidity rotor) Reviewed

Shinichi Oda, Yutaka Hasegawa, Hiroki Suzuki, Tatsuo Ushijima

Transactions of the JSME (in Japanese) 81 ( 827 ) 15-00069 2015.7

Development of a PIV System and a Measurement of Grid-Generated Turbulence

SUZUKI Hiroki, NAGATA Koji, SAKAI Yasuhiko

Journal of the Visualization Society of Japan 35 ( 139 ) 29 - 34 2015

Language：English Publisher：The Visualization Society of Japan

We develop a PIV system and validate it by measuring a grid-generated turbulence. We first show the background of this research before we approach the development of the system, and then, we describe the newly developed PIV system. We also describe an interpolation method, which we introduce into the PIV system, which notably decreases the uncertainty of PIV measurement. Then, we apply the PIV system to measurement of a grid-generated turbulent flow, and validate the PIV system by measuring the flow. First, an instantaneous flow field and basic characteristics of the flow are shown. Then, the energy decay of velocity fluctuation in the flow is shown, and coefficients of the decay law of the intensity are measured. Measuring the energy dissipation of the flow, we measure the value of these coefficients. The agreement of these coefficient values with those of previous experiments validates the PIV measurement.

DOI： 10.3154/jvs.35.139_29

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On Deviation of Operated Tip Speed Ratio of Small Wind Turbine due to Effect of Air Density Variation Reviewed

Hiroki Suzuki, Yutaka Hasegawa, Tatsuo Ushijima

Proceedings of National Symposium on Wind Engineering 23 103 - 108 2014.12

Research of electric power regeneration using automotive cooling fan (Improvement of wind turbine efficiency by changing blade profile) Reviewed

Shinichi Oda, Yutaka Hasegawa, Hiroki Suzuki, Tatsuo UshijimaSHIJIMA

Transactions of the JSME (in Japanese) 80 ( 819 ) FE0315 - (11 pages) 2014.12

Improvement of Rotor Configuration for Achievement of Automotive Fan-Turbine System Reviewed

Shinichi Oda, Yutaka Hasegawa, Hiroki Suzuki, Tatsuo Ushijima

Proceedings of the Grand Renewable Energy 2014 International Conference and Exhibition Paper No. O-Wd-15-2 - (4 pages) 2014.7

A 3D Navier-Stokes Simulation under Staggered/Collocated Grids with High-Kinetic-Energy-Conservation Reviewed

Hiroki Suzuki, Shinnosuke Matsuo, Masaya Watanabe, Yutaka Hasegawa, Tatsuo Ushijima

Proceedings of the Grand Renewable Energy 2014 International Conference and Exhibition Paper No. P-Wd-2-22 - (3 pages) 2014.7

Effects of Blade Aspect Ratio on Aerodynamic Performance of Turbine Blade in Wing-Stroke Motion Reviewed

Hironori Nakano, Noriyuki Tanimura, Yutaka Hasegawa, Hiroki Suzuki, Tatsuo Ushijima

Proceedings of the Grand Renewable Energy 2014 International Conference and Exhibition Paper No. P-Wd-1-33 - (4 pages) 2014.7

Study of Tower Effects on Rotor Characteristics of Horizontal Axis Wind Turbine Reviewed

Noriyuki Tanimura, Yutaka Hasegawa, Hiroki Suzuki, Fumiya Hara, Tatsuo Ushijima

Proceedings of the Grand Renewable Energy 2014 International Conference and Exhibition Paper No. P-Wd-1-22 - (4 pages) 2014.7

Development and Application of a Navier-Stokes Simulation Code with High- Kinetic-Energy-Conservation Reviewed

Hiroki Suzuki, Shinnosuke Matsuo, Yutaka Hasegawa, Tatsuo Ushijima

Proceedings of the Grand Renewable Energy 2014 International Conference and Exhibition Paper No. O-Wd-1-2 - (3 pages) 2014.7

A study on effects of temporally varying/ fluctuating noises on statistical profiles measured by means of PLIF method (Development of prediction formulas of the effects, and validation by high-Sc-number scalar mixing layer in grid turbulence) Reviewed

Hiroki Suzuki, Kouji Nagata, Yasuhiko Sakai, Yutaka Hasegawa, Tatsuo Ushijima

Transactions of the JSME (in Japanese) 80 ( 813 ) FE0114 2014.5

Development of turbulence behind the single square grid Reviewed

Yi Zhou, Kouji Nagata, Yasuhiko Sakai, Hiroki Suzuki, Yasumasa Ito, Osamu Terashima, Toshiyuki Hayase

Physics of Fluids 26 ( 4 ) 045102 - (17 pages) 2014.4

DNS Study on the Development of Boundary Layer with Heat Transfer under the Effects of External and Internal Disturbances Reviewed

Shuang XIA, Yasumasa Ito, Koji Nagata, Yasuhiko Sakai, Hiroki Suzuki, Osamu Terashima, Toshiyuki Hayase

Journal of Fluid Science and Technology 9 ( 1 ) JFST0005 - (13 pages) 2014.3

Language：English Publishing type：Research paper (scientific journal) Publisher：The Japan Society of Mechanical Engineers

The effects of external and internal disturbances on the development of boundary layer with heat transfer are investigated by means of direct numerical simulation (DNS) based on the finite difference scheme. The fractional step method is used to solve the governing equations. The external disturbance is generated by a regular turbulence-generating grid, while the internal disturbance is generated by a tripping object mounted on the wall. In order to clarify the momentum and heat transfer mechanism in a boundary layer under these effects, the instantaneous and statistical characteristics of velocity and temperature fields are presented and discussed along with their interactions. The results show that the boundary layer in the case with grid turbulence becomes turbulent even though the Reynolds number based on the momentum thickness is low. On the other hand, in the case with the tripping object, only low-amplitude fluctuations are generated in the vicinity of the tripping object and the boundary layer does not fully developed. The grid increases the skin friction and enhances heat transfer more significantly than the tripping object. It is also found that strong strain in the viscous sublayer, which is induced by the vortical motion in the buffer layer, contributes to the enhancement of heat transfer.

DOI： 10.1299/jfst.2014jfst0005

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Relevance of turbulence behind the single square grid to turbulence generated by regular- and multiscale-grids Reviewed

Yi Zhou, Kouji Nagata, Yasuhiko Sakai, Hiroki Suzuki, Yasumasa Ito, Osamu Terashima, Toshiyuki Hayase

Physics of Fluids 26 ( 7 ) 075105 - (22 pages) 2014

Study on Blade Elasticity Influence on Blade Load Characteristics of NREL Turbine Reviewed

Fumiya Hara, Yutaka Hasegawa, Noriyuki Tanimura, Hiroki Suzuki, Tatsuo Ushijima

Proceedings of the International Symposium on EcoTopia Science 2013 Paper No. 1063 - (1 page) 2013.12

Numerical Study of Dynamic Inflow Effects on Aerodynamic Response of HAWT Rotor Reviewed

Yuta Taniguchi, Yutaka Hasegawa, Noriyuki Tanimura, Hiroki Suzuki, Tatsuo Ushijima

Proceedings of the International Symposium on EcoTopia Science 2013 Paper No. 1034 - (1 page) 2013.12

Direct Numerical Simulation of Grid-Generated Turbulence (Analysis on Invariants and Rotta Model) Reviewed

Hiroki Suzuki, Kouji Nagata, Yasuhiko Sakai, Toshiyuki Hayase, Yutaka Hasegawa, Tatsuo Ushijima

Transactions of the Japan Society of Mechanical Engineering Series B (in Japanese) 79 ( 807 ) 2363 - 2374 2013.11

Authorship：Lead author,　Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：The Japan Society of Mechanical Engineers

The aim of this study is to address the essential features of experimental decaying grid-generated turbulence. Specifically, this study has focused on invariants of grid turbulence in the downstream region and Rotta model by means of direct numerical simulation based on the finite difference method. The mesh Reynolds number defined by the mesh size of the grid M, streamwise mean velocity and kinematic viscosity is 2; 500. Streamwise computational domain size is 112 M. The result shows that u²_oL⁴ is nearly constant such that u²_oL⁴ ∝ X^0:08 in the far downstream region, where X = x/M - x_o/M, x is the streamwise distance from the grid and x_o is the virtual origin. Rotta model is applicable in the region holding u²_oL⁴ = constant, and value of the Rotta constant is almost 1. The value can be well estimated by an estimation method introduced by previous experiments.

DOI： 10.1299/kikaib.79.2363

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DNS of Channel Flow with Two-Scale Surface Roughness on One Wall Reviewed

Hiroki Suzuki, Richard J. Perkins

Proceedings of the 14th European Turbulence Conference Paper No. 115 - (2 pages) 2013.9

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Papers - Suzuki Hiroki