• 제목/요약/키워드: Static pressure Distortion

검색결과 11건 처리시간 0.021초

터보팬엔진의 터보팬과 파일론 유동장 간섭에 관한 수치적 연구 (Turbofan and Pylon Flowfields Interaction in Turbofan Engines)

  • 주원구
    • 대한기계학회논문집B
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    • 제22권8호
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    • pp.1164-1172
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    • 1998
  • The three dimensional numerical method using actuator disk blade row model is applied for calculating the flowfield interaction between an outlet guide vane (OGV) and a pylon in a typical civil turbofan engine. The static pressure distortion produced by the pylon is decaying upstream but is still felt at the turbofan exit, and hence can significantly affect the fan performance. The OGV amplifies the static pressure perturbation decaying upstream. The calculation results show that cyclic OGV which consists of three types of blades with different exit angles can reduce more than half of the asymmetries of total pressure and static pressure propagated through the OGV with uniform exit blade angle.

입구 불균일 유동에 의한 원심압축기 스톨에 관한 실험적 연구 (The Effect of Inlet Distortion on a Centrifugal Compressor)

  • 박재형;강신형
    • 유체기계공업학회:학술대회논문집
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    • 유체기계공업학회 2003년도 유체기계 연구개발 발표회 논문집
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    • pp.476-481
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    • 2003
  • In this paper, the effect of circumferential inlet distortion on performance and stall has been experimentally investigated in a high-speed centrifugal compressor, comparing distorted cases with undistorted one. The performance of compressor was slightly deteriorated by defect of inlet static pressure which is caused by the circumferential inlet distortion. As stall was fully developed the inlet distortion did not affect the number of stall cell and the propagation velocity. It also did not affect stall inception at 40,000 and 50,000 rpm. However stall occurred at the lower flow rate for distorted flow at 60,000 rpm. For 50,000 rpm a unexpected phenomenon occurred : stall occurred first and then it disappeared.

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가스터빈용 소형 원심압축기의 탈설계점 성능에 관한 실험연구 (Experimental Study on Off-Design Performance of a Small Centrifugal Compressor for Gas Turbine Applications)

  • 오종식;이헌석;오군섭
    • 유체기계공업학회:학술대회논문집
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    • 유체기계공업학회 2000년도 유체기계 연구개발 발표회 논문집
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    • pp.211-218
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    • 2000
  • Off-design experimental performance was investigated for a small centrifugal compressor, whose impeller diameter is about 125mm, used in an industrial gas turbine. Test rig was designed and manufactured with a radial inflow turbine and a combustor to supply driving power to the compressor. Static pressure was measured on the casing of the impeller, vaneless diffuser, vaned diffuser and volute. Total pressure was obtained using specially fabricated rakes at the vaned diffuser throat and exit. Circumferential nonuniformity was found, near surge, in the Impeller, vaned diffuser and volute region. Spanwise nonuniform flow from the impeller affected the total pressure defects in the vaned diffuser region. Static pressure distortion in the circumferential direction in the volute was found near surge, where the minimum occurred near 140 degree position.

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원심형 터보기계의 볼류트네의 유동특성에 관한 실험적 연구 (An Experimental Study on Flow Characteristics in Volute of Centrifugal Turbomachinery)

  • 전경준;주원구
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2001년도 춘계학술대회논문집E
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    • pp.801-806
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    • 2001
  • The objective of present study is to find the interaction between volute and impeller of the centrifugal turbomachinery with rectangular cross-sectional volute. Flow measurement were taken in shrouded impeller with 12 backward type blades by using a five-hole pressure probe. The measurements are carried out in 7 flow rate, respectively. Primary function of a centrifugal turbo machinery volute is to serve the flow from the impeller and diffuser to pipe system. For the off-design conditions, Influence of pressure distortion was shown by these measurements. As a result, It has caused the decrease of total efficiency of centrifugal turbomachinery. We have also taken data to design volute by these measurements.

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원심형 터보기계의 임펠러-볼류트 유동간섭에 관한 실험적 연구 (Experimental investigation of impeller-volute interaction on a centrifugal turbomachinery)

  • 이경훈;주원구
    • 유체기계공업학회:학술대회논문집
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    • 유체기계공업학회 2000년도 유체기계 연구개발 발표회 논문집
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    • pp.219-225
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    • 2000
  • Primary function of a centrifugal compressor volute is to serve the flow from the impeller and diffuser to pipe system. But losses in volutes at off-design lead to poor stage efficiency and reduction of operating range. This is largely caused by the interaction between the impeller and volute flow fields. The magnitude of distortion is increased as the operating point is away from the design point and, as a result, the interaction between the impeller and volute is stronger. The objective of present study is to find the characteristics of tile flow in the diffuser and volute of the centrifugal compressor with rectangular cross-sectional volute. The measurements are carried out in two cases with the existence and nonexistence of the volute casing. The detailed pressure is presented by comparing the experimental results obtained at two cases with each others.

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가압-진공 하이브리드 주입 성형에 의한 알루미나의 성형에 미치는 다단 가압의 영향 (Effect of Step Pressure on Shape Forming of Alumina by Pressure-Vacuum Hybrid Slip Casting)

  • 조경식;이현권;우병준
    • 한국세라믹학회지
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    • 제50권2호
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    • pp.142-148
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    • 2013
  • Conventional cold isostatic pressing, slip casting, and filter pressing are not completely suitable for fabricating large plates because of disadvantages such as the high cost of equipment and formation of density gradient. These problems could be avoided by employing pressure-vacuum hybrid slip casting (PVHSC). In the PVHSC, the consolidation occurs not only by the compression of the slip in casting room, but also by vacuum sucking of the dispersion medium around the mold. We prepared the alumina bodies by the PVHSC in a static- or stepwise-pressure manner for loading up to 0.5 MPa using an aqueous slip. The green bodies were dried at $30^{\circ}C$ with 40 ~ 80% relative humidity. Under static pressure, casting induced a density gradient in the formed body, resulting in cracking and distortion after the firing. However, the stepwise pressure loading resulted in green bodies with homogeneous density, and the minimization of the appearance of those defects in final products. Desirable drying results were obtained from the cast bodies dried with 80% RH environment humidity. When sintered at $1650^{\circ}C$ for 4 h, the alumina plate made by stepwise-pressure casting reached full density (> 99.7% relative density).

임펠러-볼류트 유동간섭이 원심형 터보기계의 성능에 미치는 영향에 관한 수치해석적 연구 (Numerical simulation of impeller-volute interaction on a centrifugal turbomachinery)

  • 이재두;주원구
    • 유체기계공업학회:학술대회논문집
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    • 유체기계공업학회 1999년도 유체기계 연구개발 발표회 논문집
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    • pp.170-178
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    • 1999
  • In general, an impeller of centrifugal turbomachinery is designed at isolated condition without considering the presence of a volute, but when the impeller is operating with its volute, the performance of impeller can be different. This is largely caused by the interaction between the impeller and volute flow fields. The magnitude of distortion is increased as the operating point is away from the design point and, as a result, the interaction between the impeller and volute is stronger. In the present calculation, the flow through the impeller is simulated using coarse grids. The flow within the impeller and the volute is naturally unsteady, but the flow is assumed to be steady across the interface between the volute and impeller flow fields. Under the assumption of steady three-dimensional incompressible turbulent flow, the time averaged N-S equations involving standard k-$\epsilon$ turbulent model was solved by the F.V.M. The calculation results are compared with the experimental results obtained for an industrial fan by Sakai etc. and the Hood agreement is demonstrated. And the effects of the impeller-volute interaction are studied.

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왜곡된 로켓 모터 추력 추정에 관한 이론적 연구 (A Theoretical Study on the Estimation of Distorted Thrust of Solid Rocket Motor)

  • 김준엽
    • 한국추진공학회지
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    • 제8권2호
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    • pp.73-84
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    • 2004
  • 로켓모터의 성능을 확인하기 위해 지상에서 연소시험을 수행하여 추력, 압력, 온도. 그리고 변형률 등 필요한 데이터를 계측하지만 측정된 추력은 시험대 동특성으로 인해 실제 추력과는 달리 과도진동이 포함된 왜곡된 형태를 나타낼 수 있다. 이러한 경우에는 추력 최대치나 추력 상승시간 등 로켓모터의 성능을 결정하는 값들의 정확한 값을 얻지 못할 수 있다. 따라서 본 논문에서는 이러한 추력 왜곡 현상의 원인을 분석하고 그 문제점을 해결하기 위한 이론적인 방법을 제안한다. 또한 제안된 방법을 가상 시험대에 적용하여 제안한 방법의 적용 가능성을 확인하고, 차후 실험 데이터를 이용한 추력 추정의 기본적인 방향을 제시하고자 한다.

유한요소법을 이용한 진동요소의 요추에 미치는 영향해석 (EFFECT OF VIBRATION ON LUMBAR SPINE MECHANICS)

  • 박호상
    • 대한의용생체공학회:학술대회논문집
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    • 대한의용생체공학회 1991년도 추계학술대회
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    • pp.103-106
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    • 1991
  • A three-dimensional finite element model of a ligamentous two motion segments (L4-S1) was developed to investigate its dynamic response. A number of parameters like the intradiscal pressure, forces in ligaments. and across facet joints in response to a sinusoidal axial compression force (-360 N to -440 N at 5 Hz) were predicted. The increase in the parameters varied from 12% to as high as 50% in comparison to response for a static load of 400 N. The predicted parameters also revealed a distortion and a phase shift in comparison to the applied sinusoidal signal. These changes may lead to degenerative changes seen clinically in persons exposed to a chronic vibration environment over time.

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터빈로터 중심공 검사용 자기주행 공압형 로봇 개발 (Development of Self-Driven Pneumatic Robot for Boresonic Examination of Turbine Rotor)

  • 강배준;안명재;이철희
    • 드라이브 ㆍ 컨트롤
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    • 제18권1호
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    • pp.31-38
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    • 2021
  • This study presents a new principle for driving the robot aimed at reducing the position error for the boresonic examination of turbine rotor. The conventional method of inspection is performed by installing manipulator onto the flange of the turbine rotor and connecting a pipe, which is then being pushed into the bore. The longer the pipe gets, the greater sagging and distortion appear, making it difficult for the ultrasonic sensor to contact with the internal surface of the bore. A pneumatic pressure will ensure the front or rear feet of the robot in close contact with the inner wall to prevent slipping, while the ball screw on the body of the robot will rotate to drive it in the axial direction. The compression force required for tight contact was calculated in the form of a three-point support, and a static structural simulation analysis was performed by designing and modeling the robot mechanism. The driving performance and ultrasonic detection ability have been tested by fabricating the robot, the test piece for ultrasonic calibration and the transparent mock-up for robot demonstration. The tests have confirmed that no slipping occurs at a certain pneumatic pressure or over.