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Segmental Wedge를 이용한 차압식 유량측정 방법
윤준용,성낙원,Yoon J.Y.,Sung N.W. 한국유체기계학회 2006 한국유체기계학회 논문집 Vol.9 No.3
The discharge coefficient in segmental wedge haying ninety degrees yeller angle for the five kinds of opening ratio with differential pressure taps located at both upstream and downstream of one diameter of pipe was measured. Main purpose of this work is placed on specifying the characteristic of discharge coefficient of a segmental wedge used as a primary element of flow metering devices, and suggestion for the fixed location of pressure taps useful. Although the range of the opening ratio over this work is more expanded than previous studies. The opening ratios of segmental wedge, namely 0.3, 0.4, 0.5, 0.6 and 0.7 were investigated. The Reynolds number based on the spool inside diameter ranges from 12,000 to 380,000.
Segmental Wedge를 이용한 차압식 유량측정 방법
윤준용(J. Y. Yoon),성낙원(N. W. Sung) 한국유체기계학회 2005 유체기계 연구개발 발표회 논문집 Vol.- No.-
The discharge coefficient in segmental wedge having ninety degrees vertex angle for the five kinds of opening ratio with differential pressure taps located at both upstream and downstream of one diameter of pipe was measured .main purpose of this work is placed on developing the proper form of an equation for the discharge coefficient of a segmental wedge used as a primary element of flow metering devices, and from thata six-term equation which can express the variability of opening ratios was developed. The same assumption and hypotheses were used and tested for all procedures as conventional differential producers; however, the range of the opening ratio over this work is more expanded than previous studies. The opening ratios of segmental wedge, namely 0.3, 0.4, 0.5, 0.6 and 0.7 were investigated the Reynolds number based on the spool inside diameter ranges from 12,000 to 380,000, the resulting equation for the discharge coefficient is relatively simple; it contains only one variable-opening ratio because the characteristic of discharge coefficient of segmental wedge has little connection with the Reynolds number as shown by previous studies.
윤준용(J.Y. Yoon),맹주성(J.S. Maeng),이정원(J.W. Lee) 한국전산유체공학회 1997 한국전산유체공학회 학술대회논문집 Vol.1997 No.-
Differential pressure Venturi cone flowmeter is an advanced flowmeter which has many advantages such as wide range of measurement, high accuracy, excellent flow turndown ratio, low headloss, and short installation pipe length requirement, etc. Like other differential pressure flowmeter, Venturi cone flowmeter uses the law of energy conservation, but its shape and position make it perform better than others. The cone acts as its own flow conditioner and mixer, fully conditioning and mixing the flow prior to measurement. For the analysis, we use Reynoldsaveraged Navier-Stokes equations and k-ω turbulence model. The equations are fully transformed in the computational coordinates, the pressure-velocity coupling is made through SIMPLER algorithm, and the equations are discretized using analytic solutions of the linearized equations(Finite Analytic Method). At the end of the paper, using the result of analysis, We propose a new shape of cone with the hope of drag reduction and high performance.
수력학적 공동현상을 이용한 가열장치의 내부 딤플 변화에 의한 열효율 성능평가
박종진(Park, J. J),강찬혁(Kang, C. H),김현수(Kim, H. S),윤준용(Yoon, J. Y) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
In this paper, thermal efficiency measurement is performed with heat generator using hydraulic cavitation about the number and location of reactor’s dimple. Heat generator consist of fixed front,rear cover and rotaing reactor. When reactor’s dimple and cover’s dimple pass each other, vapor is occurred caused by cavitation in flow field. Experiment is performed in 3 case to compare influence on cavitation and thermal efficiency of heat generator in equivalent operating condition. Comparison results show that thermal efficiency is higher that dimple is located in both each side and edge case, each side case and edge case in sequence. This means the location of dimple have more influence on generation of cavitation than number of dimple. Also the more cavitation is occurred the more thermal production is confirmed.
맹주성(J.S.Maeng),윤준용(J.Y.Yoon),이길용(K.Y.Lee),손한규(H.G.Shon) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_1
The knowledge of flow patterns in bus engine room is important in designing engine room layout, because auxiliary units could be damaged and radiator be affected by heat. Flow patterns of simplified prototype bus engine room were investigated with four different inlet configurations by numerical and experimental approaches. The results show that Thermal damages are caused by weak and isolated flow in the engine room and the cooling performance of radiator is inefficient due to non-uniformity. Through the prototype bus engine room test, it was proved that the suggested model was efficient in not only preventing thermal damages but also improving cooling performance of radiator. In general, numerical solutions were in agreement with experimental results.<br/>
전동식 주유 펌프용 임펠러의 형상에 따른 수력학적 효율 향상에 관한 수치해석적 연구
강성훈(Kang, S.H),상경명(Shang, J.M),윤준용(Yoon, J.Y) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
In this study, To analysis the Hydraulic efficiency of a electric oiling pump impeller, A commercial CFD code is used. To improve hydraulic efficiency, Impeller is designed by Steppanoffs method. Finite volume method and shear stress transport turbulence model is used to predict the correct tubulent flow of the pump impeller. The efficiency of the head and flow rate are used as an index for evaluating the performance state. This study determines the diameter and the blade angle according to the rotational speed, the head, and the speed ratio according to the flow rate. This change in pump performance is investigaed in accordance with. Changes in pump geometry showed that can significantly increase the effiency of the impeller over a wide range of mass flow rate.