研究者詳細 - 清水　文雄

論文 - 清水　文雄

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Generation Mechanism of Flow Force Acting on Spool Valve 査読有り国際誌

SHIMIZU Fumio, TANAKA Kazuhiro

JFPS International Journal of Fluid Power System ( 一般社団法人日本フルードパワーシステム学会 ) 15 ( 2 ) 71 - 77 2022年01月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

In hydraulic systems, spool valves play an important role. When the spool moves to the left or right, the flow path in the control valve changes, and the flow rate of hydraulic oil is controlled by the valve opening. Since high-pressure fluid flows into the valve, it is necessary to predict the behavior of the spool with high accuracy. One of the problems that spool valves have the hydraulic vibration caused by the high-pressure fluid. There is a need for a control valve that can suppress the hydraulic vibration even if it is used stand-alone. The purpose of this study is to visualize the flow field in the spool valve using three-dimensional computational analysis, and to clarify the generation mechanism of the flow force acting on the spool. The flow force acting on the spool was caused by the pressure difference between the high-pressure region generated by the impact of the jet and the low-pressure region through which the high-speed jet passed. Fluctuation of the jet flow occurred when the valve opening became narrow. The unsteady fluctuation of the jet flow had a significant effect on the unsteady variation of the flow forces.

DOI： 10.5739/jfpsij.15.71

CiNii Research

Simulation of Fuel Pulsation and Its Reduction During Mode Switching of a Double-Gear Fuel Pump for Turbofan Engine

Masuda Seiei, Shimizu Fumio, Fuchiwaki Masaki, Tanaka Kazuhiro

nternational Gas Turbine Congress 2023 Kyoto Paper ThPM11.2 2023年11月

Flow Patterns and Hysteresis Characteristic of a Poppet Valve 査読有り国際誌

HIROSE Naoki, MASUDA Seiei, SHIMIZU Fumio, FUCHIWAKI Masaki, TANAKA Kazuhiro

JFPS International Journal of Fluid Power System ( 一般社団法人日本フルードパワーシステム学会 ) 15 ( 2 ) 53 - 61 2022年01月

記述言語：英語掲載種別：研究論文（学術雑誌）

Previous studies on poppet valves have revealed that there are various flow patterns in the flow field around the valve body and that the flow pattern inside the poppet valve has various effects on the poppet valve. Recently, Masuda et al. have reproduced the hysteresis phenomenon on the pressure and flowrate characteristics of a poppet valve by CFD analysis coupled with an equation of motion. Unfortunately, their paper does not describe the detailed relationship between the hysteresis characteristics and the flow pattern. In this study, by succeeding and developing the work of Masuda et al. and including the results of previous studies, we have systematically organized the flow patterns of poppet valves into five types and clarified the relationship between the hysteresis characteristics and flow patterns. In addition, the flow force acting on the poppet valve connecting the hysteresis characteristic and the flow pattern has also been clarified.

DOI： 10.5739/jfpsij.15.53

CiNii Research

Generation Mechanism of Flow Force Acting on Spool Valve 査読有り国際誌

Fumio SHIMIZU, Kazuhiro TANAKA

Proceedings of The 11th JFPS International Symposium on Fluid Power 2020 ( The Japan Fluid Power System Society ) GS5-2-02, pp.6 2021年10月

Internal Flow and Hysteresis Characteristic of the Poppet Type Pressure Control Valve 査読有り国際誌

Seiei MASUDA, Fumio SHIMIZU, Masaki FUCHIWAKI, Kazuhiro TANAKA

Proceedings of The 11th JFPS International Symposium on Fluid Power 2020 ( The Japan Fluid Power System Society ) OS3-03, pp.10 2021年10月

Flow Patterns and Hysteresis Characteristic of a Poppet Valve 査読有り国際誌

Naoki HIROSE, Seiei MASUDA, Fumio SHIMIZU, Masaki FUCHIWAKI, Kazuhiro TANAKA

Proceedings of The 11th JFPS International Symposium on Fluid Power 2020 ( The Japan Fluid Power System Society ) OS3-04, pp.11 2021年10月

流体抵抗と慣性を同時に満たす集中定数系モデルの導出と基本的流路形状における検証査読有り

肥後寛，清水文雄，田中和博

日本フルードパワーシステム学会論文集 ( 日本フルードパワーシステム学会 ) 52 ( 1 ) 16 - 24 2021年04月

記述言語：日本語掲載種別：研究論文（学術雑誌）

A laminar flow resistance in a pipe is usually used as a representative model of flow resistance because it is convenient to use and often gives reasonable resistance value in a small size pipe under steady state condition. However, the laminar flow resistance model in a pipe is not applicable in an oil flow passage of a real circuit because a flow passage has complex shape in a real circuit. Furthermore, the mathematical model of fluid column in a pipe made in inviscid flow condition is often used as an inertial model in considering dynamic condition. In the real condition of operating oil-hydraulic circuit, the above mentioned two effects, a complex shape of flow passage and flow dynamic characteristics, appears in viscous flow condition. A new model or modeling method to include and solve these effects reasonably becomes necessary. A new modeling method using CFD is introduced in this paper.

DOI： 10.5739/jfps.52.16

CiNii Article

CiNii Research

その他リンク： https://www.jstage.jst.go.jp/article/jfps/52/1/52_16/_pdf

ポペット弁型圧力制御弁の内部流れ解析とヒステリシスの再現査読有り

増田精鋭，清水文雄，渕脇正樹，田中和博

日本フルードパワーシステム学会論文集 ( 日本フルードパワーシステム学会 ) 52 ( 1 ) 8 - 15 2021年04月

記述言語：日本語掲載種別：研究論文（学術雑誌）

Poppet valves are often used as a pressure / flow rate control valve for a hydraulic system. Much research has been conducted on the characteristics of poppet valves. Hysteresis characteristics have emerged in pressure-flow characteristic experiments of poppet valves designed and prototyped by the author. In order to clarify the mechanism of this hysteresis characteristic, we firconfirmed the reproduction of hysteresis and confirmed the validity of the research policy. Specifically, we investigated the internal flow by CFD analysis and examined the reproduction of hysteresis characteristics by CFD. The CFD software used is Simerics MP +, which allows CFD analysis to be combined with the valve's equation of motion. First, the precision of CFD analysis was verified by confirming that the experimental values of in the reference and calculated values were in good agreement. Furthermore, CFD steady flow analysis of the internal flow was performed, and the validity of the calculation results such as the flow patterns, flow coefficient, and flow force was examined. As a result, it was clarified that there is a flow pattern that can be roughly divided into two types of internal flow with different flow rates. Then, by changing the flow rate in a time-dependent manner using CFD, we were able to reproduce the hysteresis characteristics that are in good agreement with the experimental results.

DOI： 10.5739/jfps.52.8

CiNii Article

CiNii Research

その他リンク： https://www.jstage.jst.go.jp/article/jfps/52/1/52_8/_pdf

Modelling and reducing fuel flow pulsation of a fuel-metering system by improving response of the pressure control valve during pump mode switching in a turbofan engine 査読有り国際誌

Masuda S., Shimizu F., Fuchiwaki M., Tanaka K.

ASME/BATH 2019 Symposium on Fluid Power and Motion Control, FPMC 2019 FPMC2019-1604 2020年01月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

USA Longboat Key, FL 2019年10月07日 - 2019年10月09日

In an aircraft turbofan engine, a fuel metering unit meters and supplies the required fuel to the engine according to the flight situation. When a centrifugal fuel pump (CFP) is used as the fuel pump, the ratio of hydraulic power per weight can be increased by raising the rated rotational speed, so the weight of the fuel pump can be decreased compared to when using a gear pump (GFP). There is an advantage that it can be reduced significantly. However, since the operating range of the fuel pump is wide, it is not effective to use CFP in an extremely low flow rate region because the fuel temperature rises due to its PQ characteristics and a large loss. Therefore, it is considered effective to combine CFP and GFP as pressure sources, and to use GFP in the low flow region and CFP in the high flow region. For that purpose, it is necessary to have a pump mode switching mechanism. The disadvantage in this case is that changing the pump mode causes a large pressure change of the fuel pressure source, which in turn causes fuel flow pulsations. There are three possible ways to solve this problem. The first method is to keep the differential pressure control valve (DPCV) unit response constant, which keeps the metering valve differential pressure constant in FMS. A second method is to remove high frequency components that the DPCV cannot follow pressure changes in the fuel control system. A third method is to keep the pressure difference between the two fuel sources small and to reduce the amplitude of the applied disturbance. In this paper, the first method, which makes DPCV response high response, is verified by modeling and simulation, and its effectiveness is confirmed.

DOI： 10.1115/FPMC2019-1604

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85084162075&origin=inward

Deciding the System Dynamic Parameters in a Complex Flow Passage through CFD 査読有り国際誌

Hiroshi HIGO, Tomoyuki NAKAMURA, Takeshi YAMAGUCHI, Fumio SHIMIZU, Kazuhiro TANAKA

JFPS International Journal of Fluid Power System ( The Japan Fluid Power System Society ) 11 ( 3 ) 87 - 96 10 2019年05月

記述言語：英語掲載種別：研究論文（学術雑誌）

Laminar flow resistance in a straight pipe is generally used as a representative model for flow resistance because it is convenient to use and often yields reasonable resistance values in a straight pipe under steady state condition. However, the laminar flow resistance model in a straight pipe is not applicable to oil flow passage in a real circuit owing to the complex shape of the flow passage in a real circuit. Furthermore, a mathematical model of the fluid column in a pipe under in an inviscid flow condition is often used as an inertial model while considering dynamic conditions. Under actual operating conditions of an oil-hydraulic circuit, the two abovementioned effects, complex flow passage shape and flow dynamic characteristics, appear in viscous flow condition. Therefore, it is necessary to develop a new model or modeling method for solving these effects reasonably. This study aims to introduce a new modeling method based on the computational fluid dynamics (CFD) theory.

DOI： 10.5739/jfpsij.11.87

CiNii Article

CiNii Research

その他リンク： https://confit.atlas.jp/guide/event/jfps2017/top?lang=en

Flow characteristics of water delivery piping system and its effective flow area at discharge branches 査読有り

Shimizu F., Akinaga M., Matsuyoshi Y., Tanaka K.

IOP Conference Series: Earth and Environmental Science 240 ( 6 ) IAHR2018-261 (pp. 9) 2019年03月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

Japan Kyoto 2018年09月16日 - 2018年09月21日

When we scatter water uniformly over a wide area, we often make a large number of branches and discharge outlets in a main pipe and let water be discharged from each outlet. In order to achieve uniform sprinkling, it is necessary to understand the state of the water flowing out from each outlet properly. In the present paper, the flow field inside a water delivery pipe with multiple short branch pipes was investigated using numerical calculation and experimental measurement. As a result, computational results and experimental results showed good agreement, and the validity of the computational method was confirmed. At the discharge outlet, flow surface in which air and water were mixed was formed. It was confirmed that the water area was smaller on the upstream side and became larger as going downstream. It was clarified that the discharge flow rate and the water flow area changed greatly due to the change in the discharge outlet diameter and the terminal outlet diameter.

DOI： 10.1088/1755-1315/240/6/062034

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85063971821&origin=inward

Modelling and reducing fuel flow pulsation of a fuel-metering system during pump mode switching in a turbofan engine 査読有り国際誌

Masuda S., Shimizu F., Fuchiwaki M., Tanaka K.

IOP Conference Series: Earth and Environmental Science 240 ( 5 ) IAHR2018-223 (pp. 10) 2019年03月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

Japan Kyoto 2018年09月16日 - 2018年09月21日

In this research, the transient characteristics of a new type fuel metering system for aircraft turbofan engines using two types of pumps, a gear pump and a centrifugal pump, were studied by modelling and simulation. This new fuel metering system is capable of hydraulically unloading the operating state of each pump by the pump mode switching mechanism within the permissible range of the pump rotation speed and the fuel flow rate and it is possible to reduce the fuel temperature rise due to the pressure loss in the circuit in the operation region of the entire fuel system. In addition to this, by using a small centrifugal pump that can realize high discharge flow rate, it is possible to reduce weight compared to the conventional fuel system. However, when the pump mode is switched, unexpected fluctuation in the fuel flow rate can occur when a large change in the inlet pressure of the system occurs, the pressure control unit cannot follow the change, and the transient phenomenon cannot be suppressed. At this time, the pressure waveform generated at the time of changing the pump mode includes a high frequency component such that the pressure control unit, which plays a role of keeping the metering valve differential pressure constant, cannot follow up. Therefore, in this paper, we focused on the frequency of the pressure change waveform when the pump mode was changed and studied the model of the fuel system inlet pressure in the gear pump mode. Based on that model, we propose a method to reduce the frequency characteristics of the pressure change occurring at the time of pump mode change.

DOI： 10.1088/1755-1315/240/5/052030

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85063873118&origin=inward

Modelling and Reducing Fuel Flow Pulsation of a Fuel-Metering System with a Double Gear Pump During Pump Mode Switching in a Turbo Fan Engine 査読有り

Seiei MASUDA, Kazuhiro TANAKA, Masaki FUCHIWAKI, Fumio SHIMIZU

Proceedings of Bath/ASME Symposium on Fluid Power and Motion Control 10, FPMC2018 2018年09月

スプール流体力

清水文雄，田中和博

油空圧技術 ( 日本工業出版 ) 57 ( 9 ) 37 - 41 2018年09月

Decision of System Dynamics Parameters in Complex Flow Passage through CFD 査読有り

Hiroshi HIGO, Tomoyuki NAKAMURA, Takeshi YAMAGUCHI, Kazuhiro TANAKA, Fumio SHIMIZU

Proceedings of 10th JFPS International Symposium on Fluid Power FUKUOKA 2017 8 2017年10月

Computational Analysis of Solenoid Spool Valve Considered of Leakage Flow 査読有り

Fumio SHIMIZU, Takahiro TSUKAZAKI, Takayuki HORI, Kazuhiro TANAKA, Tomohiro YASUDA, Masahito WATANABE

Proceedings of 10th JFPS International Symposium on Fluid Power FUKUOKA 2017 7 2017年10月

液圧系の流れのシミュレーション（CFD基礎）

田中和博，清水文雄

油空圧技術 ( 日本工業出版 ) 56 ( 5 ) 11 - 17 2017年05月

音響場の計算方法と計算事例

清水文雄，田中和博

油空圧技術 ( 日本工業出版株式会社 ) 54 ( 4 ) 45 - 48 2015年04月

Acoustic/Structure Coupled Analysis around Sound Insulation Cover with a Small Hole 査読有り

Fumio SHIMIZU, Junichiro TAMOA, Kazuhiro TANAKA

International Workshop on Environment & Engineering 2014 (IWEE2014) No. 106 (pp. 4) 2014年11月

Numerical Analysis of Acoustic Field around Sound Insulation Cover Using Acoustic/Structure Coupled Technique 査読有り

Fumio SHIMIZU, Koji YAMAMOTO, Hiroshi SHIGEFUI, Kazuhiro TANAKA

Proceedings of the 9th JFPS International Symposium on Fluid Power (JFPS2014Matsue) 599 - 606 2014年10月

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