• Title/Summary/Keyword: Position of air inlet

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The effect of position of propeller fan relative to duct inlet on flow characteristics (프로펠러 팬과 덕트와의 상대위치가 유동특성에 미치는 영향)

  • Sim, W.C.;Cho, K.R.;Joo, W.G.
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.9 no.1
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    • pp.14-22
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    • 1997
  • The position of propeller fan from duct inlet is one of basic parameters for the design of propeller fan. To investigate the effect of its position on fan characteristics, the inlet flow fields and relative flow angles were measured by a 5-hole pitot tube. The experimental results indicate that the ratio of radial flow introduced from propeller circumference to total inlet flow increases with the increase of propeller distance from duct inlet. When fan operates without duct, the total flow rate and the radial flow ratio are higher than those of any other positions of propeller relative to duct inlet. The radial flow ratio decreases as a flow coefficient and the propeller distance decrease. Therefore the front flow fields can be adjusted in some extent by varying the propeller distance according to a fan loading. The inlet flow angles are decreasing a little as a rotational speed and the propeller distance decrease. In the present case it was judged that the deviation angle of outlet flow became negative owing to a flow separation near a trailing edge.

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The residence time of gas in an incinerator (소각로에서의 연소가스 체류시간)

  • Kim, Sung-Joon
    • Journal of Industrial Technology
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    • v.36
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    • pp.3-7
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    • 2016
  • The change of flue gas residence time with the location of air inlet in an incinerator is analysed. An independent numerical variable is the location of air inlet and dependant is the residence time of flue gas. The mean value of turbulence energy in a primary combustion chamber is also analysed. The flow field and the distribution of turbulence energy are investigated to evaluate their influence on the residence time of flue gas and the turbulence energy. As the position of secondary air inlet approaches to the top of primary combustion chamber, the residence time of gas and the turbulence energy become longer and larger respectively.

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Convergent Investigation on Flow Analysis According to the Inlet Port of Air at Car (자동차에서의 공기의 유입구에 따른 유동해석에 관한 융합 고찰)

  • Oh, Bum-Suk;Cho, Jae-Ung
    • Journal of the Korea Convergence Society
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    • v.11 no.5
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    • pp.159-164
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    • 2020
  • In this study, the flow analysis of air in the inner side of vehicle due to the position on inlet port of air at car was carried out. Under the comfortable condition as the inlet port in which the air flows, it was possible to confirm that the inlets became the upper and middle sides or the forward side of the vehicle. If the air flow is not evenly distributed within the vehicle, the lower position of the vehicle is the lowest condition among all conditions. The results of this study will help to keep the inner state of the vehicle pleasant by adjusting the location of the inlet to suit the passenger's taste or situation. The design and analysis results of this study can be effectively applied at adjusting the location of the inlet at car. By applying the flow analysis according to the inlet port of air at car, this paper is seen as the convergence study that conforms to aesthetic design.

An Experimental Study on the Characteristics of the Vitiated Air Heater in the Ramjet Engine Ground-Testing (램제트 엔진의 지상시험용 Vitiated Air Heater의 특성에 관한 실험적 연구)

  • 윤현진;손창현;이충원
    • Journal of the Korean Society of Propulsion Engineers
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    • v.3 no.4
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    • pp.51-57
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    • 1999
  • Temperature and velocity controlling of air at inlet position of Ramjet combustor is important under Ramjet engine grounding-test condition since temperature of inlet air increases due to compression process by supersonic flow at inlet position of Ramjet combustor. In this study, Vitiated Air Heater methodology was used to control temperature of air that is inducted into Ramjet combustor. Temperature and velocity of air at Vitiated air heater exit, which is inducted into Ramjet combustor, were measured to evaluate Vitiated air heater system developed in this study. It is shown that temperature and velocity of inducted air can be well controlled using Vitiated air heater system developed in this study, and we could make a Vitiated Air which is almost same with real air.

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Ventilation Hole Optimum Design of Smart Unit Load Container for Storage and Distribution Agricultural Products by Theoretical Heat Flow Analysis (이론적 열유동 해석을 이용한 농산물 저장 및 유통 스마트 유닛로드 컨테이너의 통기공 최적화 설계)

  • Dong-Soo, Choi;Yong-Hoon, Kim;Jin-SE, Kim;Chun-Wan, Park;Hyun-Mo, Jung;Ghi-Seok, Kim;Jong-Min, Park
    • KOREAN JOURNAL OF PACKAGING SCIENCE & TECHNOLOGY
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    • v.28 no.3
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    • pp.211-215
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    • 2022
  • Air distribution occupies an important position in the smart unit load container design process for agricultural products. Inner air may be uncomfortable because of its temperature, speed, direction, and volume flow rate. It doesn't matter how efficient the ventilation equipment is if the air is not distributed well. The main aim of this study was to design the inlet and outlet fan locations of smart unit load container for agricultural products. A numerical study was performed on the effects of the location of inlet air and outlet air in relation to the container cooling sources on air distribution and thermal comfort. A concept of combining inner container cooling sources with the exhaust outlet was employed in this investigation. Also, in this research, the developed CFD (Computational Fluid Dynamics) models were thoroughly validated. This system was adopted for use in container spaces, where the exhaust outlet was located. In this study, the location of the inlet was derived through CFD for a container with a size of 1,100×1,100×1,700 mm, and it was derived that the inlet was located at the center of the lower part of the container for efficient air flow. It was efficient to position the outlet through the air inlet in the center of the lower part of the container at the top of the same side.

A Study on the Evaluation of Thermal Environment according to the Location of Ceiling Type Unit in Classroom (교실 천장형 Unit의 위치에 따른 온열환경 평가 연구)

  • Cho, Sung-Woo;Choi, Jeong-Min;Son, Young-Hwan
    • Proceedings of the SAREK Conference
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    • 2005.11a
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    • pp.135-140
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    • 2005
  • Installation of ceiling type unit is achieved by one of efforts for agreeable classroom environment embodiment along with economic growth. But research about changing the position of ceiling type unit is lacking in present. Therefore, this thesis is to study the thermal environment of 5 different position cases of ceiling type, namely Case A, B, C, D, E. Here, Case C is the case that has the position of ceiling type center of the classroom and the other 4 alternatives are 0.7 m away from the Case C according to x and z axis. In this thesis temperature distributions, air current distribution, heat amenities such as PMV of occupants are analyzed as the environmental factors. Through these factors, Case C and Case D are the better position alternatives than the alternatives of Case A, Case B and Case E because the latter cases the air current reaches directly to indoor occupants so that occupants feel chilly. This thesis has a conclusion under the condition of only one inlet air temperature and seat arrangement. But afterwards more inlet air condition and seat arrangement must be considered.

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A study on the characteristics of gas flow in inlet port of 2 cycle engine (2사이클 기관 흡기 포오트의 가스 유동 특성에 관한 연구)

  • 이창식
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.11 no.5
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    • pp.725-730
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    • 1987
  • An experimental study of the air flow through inlet pipe of reciprocating two-cycle engine was investigated under motored condition. Measurements of the two components of velocity, velocity fluctuation, and the other behavior of inlet flow have been obtained by laser Doppler anemometer system. The research engine comprised the cylinder head of a two-cycle engine which mounted on optical spacer with measuring window and glass inlet entry for laser anemometer measurement. A dual beam laser Doppler anemometer was used with conventional forward scattered method and comprised argon-ion laser, frequency shifter with Bragg cell module, and the signal processor. Measurements of mean velocity fluctuation of inlet flow for different engine speeds, measuring positions, and the changes in cylinder volume are investigated. The results presented show that the changes in engine speed is shown to be strongly influenced on the mean velocity of inlet air. The effect of measuring position and cylinder volume on the inlet velocity was also investigated for the inlet port entry and is shown to be small compared to the engine speed.

A Study on the Characteristics of Heat Transfer in Quadrangle Duct with Solar Absorber Plate (태양열 집열면이 있는 4각 덕트 내의 열전달 특성에 관한 연구)

  • 고동국;조대진;윤석주;박상규
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.14 no.12
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    • pp.1014-1022
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    • 2002
  • This paper analyzed the characteristics of heat transfer in quadangle duct with absorber plate by solar radiation. Effects o( Reynolds number on increasing temperature at outlet for variation of absorber plate temperature were analyzed by using numerical analysis technique. And also the effects of turbulent intensity of inlet flow on increasing temperature at outlet for various duct height and effects of inlet aspect ratio of quadrangle duct and position of heating surface on the outlet temperature were analysed. As the results, Outlet temperature was greatly influenced in low Reynolds number. And the highest outlet temperature distribution appeared on the inlet aspect ratio 2 because of the buoyancy effect.

A Study on the Smoke Movement by the Opening and Heat Generator Position (개구부와 열원의 위치에 따른 연기이동에 관한 연구)

  • 조성우;이재윤
    • Fire Science and Engineering
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    • v.16 no.4
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    • pp.7-14
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    • 2002
  • The diffusion characteristics of the smoke by effect of an ascending air movement in a local part of the room where heat generated was studied. How the smoke move in the limited parts of the room at which heat generated was studied through 3 cases altering locations of inlet and outlet of ventilated air and heat generated by CFD(Computational Fluids Dynamics) method. It was found that 1. Similar distribution of air velocity, air temperature and smoke concentration appeared in the case of upper left inlet and lower right outlet and the case of lower inlet and upper right outlet. 2. Distribution of temperature and smoke concentration was 0∼0.3, 0.06∼0.14 in the case of lower left inlet and upper right outlet. 3. the location of heat generation did not influence on the temperature distribution, but influence on the distribution of smoke concentration.

Thermal Environment Analysis of a Classroom by CFD Simulation to Determine Optimal Temperature Sensor Position in Ceiling Type Air-Conditioning System (천정형 에어컨 온도센서의 최적 위치 결정을 위한 교실의 CFD 열환경 분석)

  • Li, M.H.;Kim, D.G.;Kum, J.S.;Jeong, S.K.
    • Journal of Power System Engineering
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    • v.10 no.4
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    • pp.43-49
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    • 2006
  • Nowadays, the thermal environments of classrooms are usually adjusted by the ceiling type air-conditioning system with a temperature sensor installed on inlet of an air-conditioner. However, it is not clear that the conventional temperature sensor position is proper to satisfy both thermal comport and energy saving in summer especially. Therefore, this study is aimed at finding out the best position of the temperature sensor on the purpose of the comfort thermal environment and energy saving. The different 5 positions for the temperature sensor are supposed in this paper to analyze thermal environment by CFD. From the analysis through the CFD simulations, the best position of the temperature sensor satisfying for both comfort thermal environment and energy saving is obtained.

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