• Title, Summary, Keyword: Pitot tube

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3D numerical simulation of temperature on Pilot tube

  • Ying Wang;Baogeng Ding
    • 한국전산유체공학회:학술대회논문집
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    • pp.248-251
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    • 2006
  • Multi-physics problem is considered for the Pitot tube located in uniform freon gas flow with high Mach number and the 3D numerical results of temperature on Pitot tube is given. The model is created by using structural module of ANSYS, the grids are obtained by ICEM, and the problem is solved and the data post-processing is done by CFX.

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A Study on the Characteristics of Multi-point Pilot Tube Flow-meter (다점 피토관 유량계의 특성에 관한 연구)

  • 임재명;윤복현;박경암
    • The KSFM Journal of Fluid Machinery
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    • v.4 no.2
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    • pp.35-43
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    • 2001
  • The flow characteristics passing a multi-point Pitot tube flow-meter of diamond shape and the characteristics of flow coefficients of the flow-meter are experimentally studied by varying combination of upstream rectangular dual elbows. The results provide the flow coefficients, which show good stability and reliability within the Reynolds number range coveted here in this study, and which can be used to measure flow-rates in practice. The variation of dual elbows upstream can change the velocity field so much that the flow pattern might thwart the precise flow measurement using the multi-point Pitot tube. The strongest swirl is detected in the case of $90^{\circ}$ dual elbow combination of all. In addition, it is observed that flow separation remains unchanged and occurs at the same point irrespective of various upstream dual elbow combinations.

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A Study on Flow Velocity Distribution at Inlet and Exit of Diesel Particulate Filter with L-Shape Inlet Connector Using Automatic Measurement (측정자동화에 의한 입구연결부 형상이 L-형인 디젤매연필터 입.출구에서의 유속 분포에 관한 연구)

  • Lee, Choong-Hoon;Bae, Sang-Hong;Choi, Ung;Lee, Su-Ryong
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.16 no.4
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    • pp.93-100
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    • 2007
  • The flow velocity distribution at inlet and exit of Diesel Particulate Filter(DPF) by fabricating L-shape connector with the DPF was measured using a Pitot-tube and 2-D transverse machine. An adaptor designed for making the Pitot tube probe access to the inlet and exit of the DPF was connected with the inlet and exit flange of the DPF, respectively. The Pitot tube which was mounted in the 2-D positioning machine could access to the inlet and exit of the DPF through the rectangular window of the adaptor. The L-shape connector in the DPF inlet has a flow guide which is a perforated steel pipe. The flow velocity distribution at the inlet of the DPF showed a chaotic velocity distribution which is different from that with a diffuser type connector. The velocity distribution at the exit of the DPF showed a crown shape which is similar to that of the diffuser type connector. The velocity distribution at the exit of DPF showed different patterns according to the air flow rate.

Measurement of Flow Velocity Distribution at Inlet and Exit of Diesel Particulate Filter (디젤 엔진 매연여과장치 입.출구에서의 유속 분포 측정)

  • Lee, Choong-Hoon;Choi, Ung;Bae, Sang-Hong;Lee, Su-Ryong
    • Journal of the Korean Society for Railway
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    • v.10 no.3
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    • pp.343-349
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    • 2007
  • The flow velocity distribution at inlet and exit of a DPF was measured using a Pitot tube and 2-D positioning equipment. An adaptor which was designed for accessing the Pitot tube probe into inlet of the DPF was fabricated with inlet flange of the DPF. The Pitot tube which was mounted in the 2-D positioning machine could access to the inlet of the DPF through the rectangular window of the adaptor. Automation of the velocity measurement at the inlet and exit of the DPF was effectively achieved and measuring time was reduced drastically. The flow velocity distribution at the inlet of the DPF showed parabola shape with maximum velocity near to the center of the DPF, as expected. The velocity distribution at the exit of the DPF showed crown shape, that is, the flow velocity distribution near to the center of the DPF is lower than that at surrounded peripheral region of the DPF.

A CFD ANALYSIS OF THE FLOWFIELD OF A HELICOPTER IN FORWARD MOTION FOR THE STUDY OF PITOT-TUBE FOR INSTALLATION LOCATION (피토튜브 장착위치 선정을 위한 전진 비행하는 헬리콥터 유동장의 CFD 분석)

  • Cho, H.G.;Kang, Y.J.;Kim, S.H.;Myong, R.S.;Cho, T.H.;Park, Y.M.
    • 한국전산유체공학회:학술대회논문집
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    • pp.256-261
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    • 2008
  • A CFD analysis of helicopter flowfield in forward flight is considered as non-trivial issue because of the complexity of vorticity-dominated flowfield. In this work, a study on the selection of the proper location for the installation of the Pitot probe is conducted using a CFD code which can deal with the interaction of rotor blade vortex and body. To describe the flow patterns for rotating rotor blades and body, the sliding mesh scheme is utilized. Pressure distributions and flow patterns are also analyzed to identify regions free from the interaction of body and wake induced from rotor blades.

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A CFD ANALYSIS OF THE FLOWFIELD OF A HELICOPTER IN FORWARD MOTION FOR THE STUDY OF PITOT-TUBE FOR INSTALLATION LOCATION (피토튜브 장착위치 선정을 위한 전진 비행하는 헬리콥터 유동장의 CFD 분석)

  • Cho, H.G.;Kang, Y.J.;Kim, S.H.;Myong, R.S.;Cho, T.H.;Park, Y.M.
    • 한국전산유체공학회:학술대회논문집
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    • pp.256-261
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    • 2008
  • A CFD analysis of helicopter flowfield in forward flight is considered as non-trivial issue because of the complexity of vorticity-dominated flowfield. In this work, a study on the selection of the proper location for the installation of the Pitot probe is conducted using a CFD code which can deal with the interaction of rotor blade vortex and body. To describe the flow patterns for rotating rotor blades and body, the sliding mesh scheme is utilized. Pressure distributions and flow patterns are also analyzed to identify regions free from the interaction of body and wake induced from rotor blades.

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Experimental Approach for Estimation of Hydrodynamic Force Acting on a Submerged Streamlined Body Translating in a One-end-opened Cylindrical Tube (수중운동체의 실린더 관 내부 이동시 작용력 예측에 대한 실험적 접근)

  • Yeo, Dong-Jin;Kim, Yeon-Gyu;Kim, Dong-Hun
    • Journal of the Society of Naval Architects of Korea
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    • v.49 no.2
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    • pp.203-211
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    • 2012
  • The main object of this experiment is to estimate the hydrodynamic forces acting on a submerged streamlined body placed in a one-end-opened cylindrical tube moving with certain translational velocity. The best experimental design for this object is mimicking real situation, however sizes of model body and cylinder tube are just the same as those of real, for avoiding scale effects, mimicking real situation is not realizable. Hence, in this experiment, target body and cylindrical tube were designed to be towed with varying body position relative to cylindrical tube. For measuring hydrodynamic forces and flow velocity in the cylindrical tube, six one-component load cells and several one-hole Pitot tubes were used. Several conditions were checked with various end-plates those had different opening areas. Experiment results show that forces and flow velocity had different tendency with those expected, and the presence of a end-plate slows down the flow velocity in the cylindrical tube and affects pressure field in the tube to push the model submerged body forward of the tube. This tendency grows with decreasing opened area.

Design of Pitot-Tube Configuration Using CFD Analysis and Optimization Techniques (CFD 해석 및 최적화 기법을 이용한 피토관 형상설계)

  • Kim, Do-Jun;Cheon, Young-Seong;Myong, Rho-Shin;Park, Chan-Woo;Cho, Tae-Hwan;Park, Young-Min;Choi, In-Ho
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.32 no.5
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    • pp.392-399
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    • 2008
  • Accurate measurement of speed and altitude of flying vehicles in air data system remains a critical technical issue. A highly reliable Pitot-static probe is required to obtain air data such as total pressure and static pressure. In this study, an analysis of the characteristics of flowfield around the Pitot-static probe was performed by using a Navier-Stokes CFD code. In addition, for the purpose of finding an optimal configuration, a technique based on the response surface method is applied to the problem with design parameters including shape of the nose section and cone angle. It is shown that the optimal configuration fulfills the MIL specification in wider range of high angles of attack.

Flow Measurements and Performance Analysis using a 5-Hole Pitot Tube and a Rotating Hot-Wire Probe in an Axial Flow Fan (5공 피토관 및 회전 열선 유속계에 의한 축류 홴 내부 유동장 계측 및 평가)

  • Jang, Choon-Man;Kim, Kwang-Yong
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.27 no.12
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    • pp.1750-1757
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    • 2003
  • This paper describes the flow measurements inside the blade passage of an axial flow fan by using a rotating hot-wire probe sensor from a relative flame of reference fixed to the rotor blades. The validity of fan rotor designed by a streamline curvature equation was performed by the measurement of the three-dimensional flow upstream and downstream of the fan rotor using a 5-hole pitot tube. The vortical flow structure near the rotor tip can be clearly observed by the measurements of a relative velocity and its fluctuation on quasi-orthogonal planes to a tip leakage vortex. Larger vortical flow, which results in higher blockage in the main flow, is formed according to decrease a flow rate. The vortical flow spreads out to the 30 percent span from the rotor tip at near stall condition. In the design operating condition, the tip leakage vortex is moved downstream while the center of the vortex keeps constant in the spanwise direction. Detailed characteristics of a velocity fluctuation with relation to the vortex were also analyzed.

Experimental Study for the Aerodynamic Characteristics of Slanted-Base Ogive Cylinder (기저면이 경사진 Ogive실린더의 공력특성에 관한 실험적 연구)

  • 맹주성;양시영;오세진
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.18 no.10
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    • pp.2664-2674
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    • 1994
  • Drag, lift, and pitching moment measurements have been made on a range of slanted-base ogive cylinders, using the KANOMAX wind tunnel and balance system. Test Reynolds numbers(based on model maximum diameter) varied from $0.54{\times}10^{5}{\;}to{\;}1.56{\times}10^{5}$. Crossflow velocity maesurement was conducted by 5-hole pitot tube at $Re_{D}=1.46{\times}10^{5}$. For two base angle $({\theta}=30$ and 45 deg.), aerodynamic forces and moment were measured with increasing angle of attack(0~30 deg.). Two types of wake flow were observed, a quasisymetric turbulent closure or a longitudinal vortex flow. Aerodynamic characteristics differ dramatically between the two wake types. It was found that the drag, lift and pitching moment coefficients increased with increasing angle of attack.