K
Kenichi Tezuka
Researcher at Tokyo Electric Power Company
Publications - 52
Citations - 375
Kenichi Tezuka is an academic researcher from Tokyo Electric Power Company. The author has contributed to research in topics: Ultrasonic flow meter & Control valves. The author has an hindex of 10, co-authored 52 publications receiving 329 citations.
Papers
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Journal ArticleDOI
Flow-induced vibration of a steam control valve
Koichi Yonezawa,Ryohei Ogawa,Kanako Ogi,Tomofumi Takino,Yoshinobu Tsujimoto,Takahide Endo,Kenichi Tezuka,Ryo Morita,Fumio Inada +8 more
TL;DR: In this article, experimental and numerical investigations are conducted using rigid and flexible valve head supports to clarify the mechanisms of valve head vibrations that are caused by unsteady flows around the valve.
Journal ArticleDOI
CFD Simulations and Experiments of Flow Fluctuations Around a Steam Control Valve
TL;DR: In this article, the authors investigated the valve instability that is responsible for large vibrations in a steam control valve and found that a complex three-dimensional (3D) flow structure (valve-attached flow) sets up in the valve region leading to a high pressure region on a part of the valve body.
Journal ArticleDOI
Ultrasonic pulse-Doppler flow meter application for hydraulic power plants
TL;DR: In this paper, an ultrasonic pulse Doppler flow meter was used to measure velocity profiles in a steel penstock with a diameter of over one meter and Reynolds number of more than five million, and two transducers were placed on the pipe surface to validate the multi-line measurement of asymmetric flow.
Journal ArticleDOI
Assessment of Effects of Pipe Surface Roughness and Pipe Elbows on the Accuracy of Meter Factors Using the Ultrasonic Pulse Doppler Method
Kenichi Tezuka,Michitsugu Mori,Takeshi Suzuki,Masanori Aritomi,Hiroshige Kikura,Yasushi Takeda +5 more
TL;DR: In this article, the velocity profile of the flow in a pipe and its influence on the profile factor used with conventional flow meters were investigated with ultrasonic pulse Doppler measurements, from the measured velocity profiles, the influences of surface roughness and Reynolds number were characterized qualitatively and quantitatively.
Patent
Ultrasonic flowmeter, wedge for ultrasonic flowmeter, method for setting ultrasonic transmitting/receiving unit, and ultrasonic transmitting/receiving unit
TL;DR: In this article, a technique for more accurate flowrate measurement by allowing transmission in both a wedge and a pipe wall and measuring flowrate more accurately is provided. But the ultrasonic transmitting/receiving unit is of a clamp-on type and the distance from ultrasonic transmission means of a wedge to the outer wall of the fluid pipe and fluid pipe thickness satisfy the condition that they are both integral multiples of λ/2 of the use frequency.