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한국분무공학회> 한국분무공학회지(구 한국액체미립화학회지)> 디젤 엔진 연료 분사 타이밍 구간에서의 흡기 포트 스월비 1D 컴퓨터 시뮬레이션

KCI등재

디젤 엔진 연료 분사 타이밍 구간에서의 흡기 포트 스월비 1D 컴퓨터 시뮬레이션

1D Computer Simulation of Diesel Engine Intake Port Swirl Ratios Considering the Fuel Injection Timing Range

오대산 ( Dae San Oh ) , 이충훈 ( Choong Hoon Lee )
  • : 한국분무공학회
  • : 한국분무공학회지(구 한국액체미립화학회지) 26권2호
  • : 연속간행물
  • : 2021년 06월
  • : 81-87(7pages)
한국분무공학회지(구 한국액체미립화학회지)

DOI


목차

1. 서 론
2. 컴퓨터 시뮬레이션
3. 결과 및 검토
4. 결 론
참고문헌

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초록 보기

This study was performed to calculate the swirl ratio of a diesel engine intake port by a 1D computer simulation under actual engine operating conditions. The swirl ratio of the intake port was simulated according to the change of the engine speed during the operation of the motoring without fuel injection. The swirl ratio of the intake port was simulated according to changes in the crank angle during the four-cycle operation of intake, compression, expansion and exhaust. The swirl ratio represented by the three regions of the piston, center and squish was simulated. Among the three regions, the piston-region swirl ratio is important for effective air-fuel mixing in the engine cylinder. In particular, it was confirmed during the simulation that the piston swirl ratio before and after the compression top dead center (TDC) point when fuel is injected in the DI diesel engine can have a significant effect on the mixing of air and fuel. It was desirable to set the average piston swirl ratio over a crank angle section before and after compression TDC as the representative swirl ratio of the cylinder head intake port according to the change of the engine speed.

UCI(KEPA)

I410-ECN-0102-2022-400-000653789

간행물정보

  • : 자연과학분야  > 화학
  • : KCI등재
  • :
  • : 계간
  • : 1226-2277
  • : 2288-9051
  • : 학술지
  • : 연속간행물
  • : 1996-2022
  • : 839


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1Study on Effects of Pressure Ratio on the Wall-impingement Spray Characteristics of Nitrogen Gas using CNG Injector

저자 : Quangkhai Pham , Mengzhao Chang , Byungchul Choi , Suhan Park

발행기관 : 한국분무공학회 간행물 : 한국분무공학회지(구 한국액체미립화학회지) 27권 1호 발행 연도 : 2022 페이지 : pp. 1-10 (10 pages)

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In this study, an experimental investigation on the effects of the pressure ratio on the wall-impingement spray characteristics of nitrogen gas using a compressed natural gas (CNG) injector was conducted. The transient development of the impingement spray was recorded by a high speed camera with Z-type Schlieren visualization method. The spray behavior under various pressure ratio conditions were analyzed. The experimental results showed that the pressure ratio has positive effect on the development of spray wall-impingement. The effects of the above factor were evaluated in a constant volume chamber at atmospheric conditions. The data from test showed that, with the increase of the pressure ratio, the spray tip penetration (STP) quickly increases before the impingement and gradually increases after the impingement. Additionally, the spray velocity first increases and then sharply decreases on regardless of the injection pressure level. As the spray spreading angle increases, spray area and volume increases rapidly with the increase in STP at the beginning of injection, and finally entered a stable range, has a great correlation with the increase of pressure ratios.

KCI등재

2EHC 기반 Urea-SCR 시스템 히터 표면온도 분포의 1-D 모델링

저자 : 박선홍 ( Sunhong Park ) , 손지현 ( Jihyun Son ) , 문석수 ( Seoksu Moon ) , 오광철 ( Kwangchul Oh ) , 장성욱 ( Sungwook Jang ) , 박성서 ( Sungsuh Park )

발행기관 : 한국분무공학회 간행물 : 한국분무공학회지(구 한국액체미립화학회지) 27권 1호 발행 연도 : 2022 페이지 : pp. 11-17 (7 pages)

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In upcoming Post Stage-V and Tier 5 regulations of construction machineries, nitrogen oxide (NOx) emissions are strictly limited in cold start conditions. In response to this, a method of improving NOx conversion efficiency has been applied by installing an electric heating catalyst (EHC) in front of conventional urea-SCR systems so that the evaporation and thermal decomposition of urea-water solution can be promoted in cold start conditions. In this strategy, the evaporation and thermal decomposition of urea-water solution and corresponding NOx conversion efficiency are governed by temperature conditions inside the EHC. Therefore, characterizing the temperature distribution in the EHC under various operating conditions is crucial for the optimized operation and control of the EHC in Urea-SCR systems. In this study, a 1-D modeling analysis was performed to predict the heater surface temperature distribution in EHC under various operating conditions. The reliability of prediction results was verified by comparing them with measurement results obtained using an infrared (IR) camera. Based on 1-D analysis results, the effects of various EHC operation parameters on the heater surface temperature distribution were analyzed and discussed.

KCI등재

3스월-안정화 연소기에서 혼합기 공진모드가 동적 연소특성에 미치는 영향

저자 : 한선우 ( Sunwoo Han ) , 이신우 ( Shinwoo Lee ) , 황동현 ( Donghyun Hwang ) , 안규복 ( Kyubok Ahn )

발행기관 : 한국분무공학회 간행물 : 한국분무공학회지(구 한국액체미립화학회지) 27권 1호 발행 연도 : 2022 페이지 : pp. 18-25 (8 pages)

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Hot-firing tests were performed to experimentally confirm the effect of the eigenmode in the fuel-air mixing section on combustion instability by changing mixing section length, inlet mean velocity, equivalence ratio, and swirler geometry. A premixed gas composed of air and ethylene was supplied to the combustion chamber through an mixing section and an axial swirler. As the mixing section length increased, the inlet velocity perturbation decreased, but the combustion instability increased more. It was found that the resonance frequency of the first longitudinal mode in the mixing section shifted to the third longitudinal mode as the length of the mixing section increased. The results implied that the transition of the resonace frquency by changing the length of the mixing section might cause combustion instability.

KCI등재

4정전분무모드에 관한 액적특성의 실험적 연구

저자 : 김지엽 ( Ji Yeop Kim ) , 이도현 ( Doe Hyun Lee ) , 조주형 ( Ju Hyung Cho ) , 홍정구 ( Jung Goo Hong )

발행기관 : 한국분무공학회 간행물 : 한국분무공학회지(구 한국액체미립화학회지) 27권 1호 발행 연도 : 2022 페이지 : pp. 26-35 (10 pages)

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Electrospray is a method of atomizing fluid using high voltage supply and capable of generating continuous flow and coherent size of droplets. Electrical system and properties of fluids has enabled electrospray to have various spray modes. However, its studies have been confined only in Cone jet, which is more stable and easier to manipulate droplets' size than other spraying modes. Therefore, it is necessary to investigate and compare other spraying modes based on experimental parameters and physical properties of fluids. This research paper identified nine different spray modes. It was found out that Sauter Mean Diameter (SMD) is proportional to flow rate of fluids and maximum difference among spray modes was 1.7 times. On the other hand, SMD standard deviation had low variations on specific flow rates of fluids. Pulsed jet mode recorded the largest SMD standard deviation, while Spindle recorded the lowest.

KCI등재

53차원 유한요소해석 기법을 사용한 수소-천연가스 혼소 가스터빈 연소기에서의 연소불안정 해석

저자 : 홍수민 ( Sumin Hong ) , 김대식 ( Daesik Kim )

발행기관 : 한국분무공학회 간행물 : 한국분무공학회지(구 한국액체미립화학회지) 27권 1호 발행 연도 : 2022 페이지 : pp. 36-41 (6 pages)

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In this study, the combustion instability characteristics according to the change in the hydrogen ratio in the fuel in the single nozzle system of the hydrogen-natural gas mixed gas turbine for power generation was analyzed using a three-dimensional finite element analysis-based Helmholtz solver. This combustor shows the instability characteristics in which mode transition occurs from a mode having a low amplitude near 70 Hz to a mode having a high amplitude of 250 Hz or higher as the hydrogen fraction in the fuel increases. The current modeling results are found to reasonably predict the main characteristics of the change in measured instability frequency and growth rate with the change in fuel composition.

KCI등재

6인젝터 압력이 단공노즐 감압비등 분무에 미치는 영향

저자 : 이현창 ( Hyunchang Lee ) , 차현우 ( Hyunwoo Cha ) , 강동현 ( Donghyeon Kang )

발행기관 : 한국분무공학회 간행물 : 한국분무공학회지(구 한국액체미립화학회지) 27권 1호 발행 연도 : 2022 페이지 : pp. 42-49 (8 pages)

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Flash boiling occurs in a couple of modern engineering systems and understanding its mechanism is important. In this experimental study, discharge coefficient of flash boiling spray from simple orifice nozzle was measured, and backlight imaging was acquired at injection pressure to 6.0 bar and temperature to 163℃ for the purpose. Pressurized water by pump was used for working fluid and was heated by electric heater and ejected through simple orifice nozzle diameter of 0.5 mm. High speed camera with long distance microscope was used for backlight imaging in two FoV having magnification of 3.3 and 0.64. The decrease of discharge coefficient according to degree of superheating and evolution of flash boiling spray imaged at various pressure and temperature were explained by the pressure field inside the injector.

1
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KCI등재

1디젤/천연가스 반응성제어 압축착화 엔진에서 피스톤 형상에 따른 연소 특성

저자 : 김현수 ( Hyunsoo Kim ) , 김우영 ( Wooyeong Kim ) , 배충식 ( Choongsik Bae )

발행기관 : 한국분무공학회 간행물 : 한국분무공학회지(구 한국액체미립화학회지) 26권 2호 발행 연도 : 2021 페이지 : pp. 57-66 (10 pages)

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The reactivity controlled compression ignition (RCCI) is the technology that provides two different types of fuel to the combustion chamber with the advantage of significantly reducing particulate matter and nitrogen oxides emissions. However, due to the characteristics of lean combustion, combustion efficiency is worsened. The conventional type of pistons for conventional diesel combustion (CDC) has mostly been used in the researches on RCCI. Because the pistons for CDC are optimized to enhance flow and target spray, the pistons are unsuitable for RCCI. In this study, a piston that is suitable for RCCI is designed to improve combustion efficiency. The new piston was designed by considering the factors such as squish geometry, bowl depth, and surface area. The experiment was carried out by fixing the energy supply to 0.9kJ/cycle and 1.5kJ/cycle respectively. The two pistons were quantitatively compared in terms of thermal efficiency and combustion efficiency.

KCI등재

2열화상카메라를 이용한 Rayleigh-Benard-Marangoni 자연대류 실험 연구

저자 : 김정배 ( Jeongbae Kim )

발행기관 : 한국분무공학회 간행물 : 한국분무공학회지(구 한국액체미립화학회지) 26권 2호 발행 연도 : 2021 페이지 : pp. 67-72 (6 pages)

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Rayleigh-Benard-Marangoni (RBM) convection have been artificially made for application of various engineering fields. For a relatively larger circular container, natural convection experiments were carried out to reveal and show the flow characteristics with engine oil (SAE30) using IR camera. IR camera has captured the temperature distribution on the free surface. From these experiments, it was confirmed that it was possible to quantitatively analyze the occurrence characteristics of RBM flow clearly from the thermal images taken with IR camera. As the aspect ratio increased, both the number of internal and external cavities increased. And found that the criteria of RBM flow generation proposed through previous experiments performed for small-sized containers are also very effective with the results on larger circular container.

KCI등재

3상압에서 부탄올 젤 연료액적의 증발특성

저자 : 남시욱 ( Siwook Nam ) , 김혜민 ( Hyemin Kim )

발행기관 : 한국분무공학회 간행물 : 한국분무공학회지(구 한국액체미립화학회지) 26권 2호 발행 연도 : 2021 페이지 : pp. 73-80 (8 pages)

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Evaporation characteristics of single butanol gel fuel were investigated in different mass ratios of gellant and ambient temperatures. Gel fuel was made by adding the pure water and hydroxypropylmethyl cellulose (HPMC) into the 1-butanol. Increase of viscosity was observed when the loading of HPMC increased. The evaporation process of gel droplet could be divided into three stages: droplet heating, micro-explosion and crust formation. Elevation of ambient temperature helped boost the evaporation in all experimental cases, but the effect was mitigated when the mass ratio of HPMC increased. Increase of HPMC weight ratio reduced the evaporation rate.

KCI등재

4디젤 엔진 연료 분사 타이밍 구간에서의 흡기 포트 스월비 1D 컴퓨터 시뮬레이션

저자 : 오대산 ( Dae San Oh ) , 이충훈 ( Choong Hoon Lee )

발행기관 : 한국분무공학회 간행물 : 한국분무공학회지(구 한국액체미립화학회지) 26권 2호 발행 연도 : 2021 페이지 : pp. 81-87 (7 pages)

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This study was performed to calculate the swirl ratio of a diesel engine intake port by a 1D computer simulation under actual engine operating conditions. The swirl ratio of the intake port was simulated according to the change of the engine speed during the operation of the motoring without fuel injection. The swirl ratio of the intake port was simulated according to changes in the crank angle during the four-cycle operation of intake, compression, expansion and exhaust. The swirl ratio represented by the three regions of the piston, center and squish was simulated. Among the three regions, the piston-region swirl ratio is important for effective air-fuel mixing in the engine cylinder. In particular, it was confirmed during the simulation that the piston swirl ratio before and after the compression top dead center (TDC) point when fuel is injected in the DI diesel engine can have a significant effect on the mixing of air and fuel. It was desirable to set the average piston swirl ratio over a crank angle section before and after compression TDC as the representative swirl ratio of the cylinder head intake port according to the change of the engine speed.

KCI등재

5액적 체적이 증발 특성에 미치는 영향에 관한 수치해석 연구

저자 : 정찬호 ( Chan Ho Jeong ) , 이형주 ( Hyung Ju Lee ) , 김홍석 ( Hong Seok Kim ) , 이성혁 ( Seong Hyuk Lee )

발행기관 : 한국분무공학회 간행물 : 한국분무공학회지(구 한국액체미립화학회지) 26권 2호 발행 연도 : 2021 페이지 : pp. 88-95 (8 pages)

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This study aims to investigate the influence of the droplet volume on the evaporation characteristics of the sessile droplet. In particular, the effect of the free convection in the vapor domain on the evaporation rate was analyzed through the numerical simulation. The commercial code of the ANSYS Fluent (V.2020 R2) was used to simulate the heat transfer in the liquid-vapor domain. Moreover, we used the diffusion model to estimate the evaporation rate for the different droplet volume under the room temperature. It was found that the evaporation rate significantly increases with the droplet volume because of the larger surface area for the mass transfer. Also, the effect of free convection on the evaporation rate becomes significant with an increment of droplet volume owing to the increase in the droplet radius corresponding to the characteristic length of the free convection.

KCI등재

6가습연소 폐열회수 보일러의 물분사 설계모델 구축에 관한 연구

저자 : 신재훈 ( Jaehun Shin ) , 문석수 ( Seoksu Moon )

발행기관 : 한국분무공학회 간행물 : 한국분무공학회지(구 한국액체미립화학회지) 26권 2호 발행 연도 : 2021 페이지 : pp. 96-103 (8 pages)

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In order to improve the overall efficiency and meet the emission regulations of boiler systems, the heat exchanging methods between inlet air and exhaust gas have been used in boiler systems, named as the waste-heat-recovery condensing boiler. Recently, to further improve the overall efficiency and to reduce the NOx emission simultaneously, the concept of the water injection into the inlet air is introduced. This study suggests the models for the optimized design parameters of water injection for waste-heat-recovery condensing boilers and performs the analysis regarding the water injection amount and droplet sizes for the optimized water injection. At first, the required amount of the water injection was estimated based on the 1st law of thermodynamics under the assumption of complete evaporation of the injected water. The result showed that the higher the inlet air and exhaust gas temperature into the heat exchanger, the larger the amount of injected water is needed. Then two droplet evaporation models were proposed to analyze the required droplet size of water injection for full evaporation of injected water: one is the evaporation model of droplet in the inlet air and the other is that on the wall of heat exchanger. Based on the results of two models, the maximum allowable droplet sizes of water injection were estimated in various boiler operating conditions with respect to the residence time of the inlet air in the heat exchanger.

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