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한국분무공학회> 한국분무공학회지(구 한국액체미립화학회지)> 디젤/천연가스 반응성제어 압축착화 엔진에서 피스톤 형상에 따른 연소 특성

KCI등재

디젤/천연가스 반응성제어 압축착화 엔진에서 피스톤 형상에 따른 연소 특성

Influence of Piston Bowl Geometry on Combustion of a Diesel/CNG Reactivity Controlled Compression Ignition Engine

김현수 ( Hyunsoo Kim ) , 김우영 ( Wooyeong Kim ) , 배충식 ( Choongsik Bae )
  • : 한국분무공학회
  • : 한국분무공학회지(구 한국액체미립화학회지) 26권2호
  • : 연속간행물
  • : 2021년 06월
  • : 57-66(10pages)
한국분무공학회지(구 한국액체미립화학회지)

DOI


목차

기호설명
1. 서 론
2. 실험 장치 및 조건
3. 실험 결과
4. 결 론
후 기
참고문헌

키워드 보기


초록 보기

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.

UCI(KEPA)

간행물정보

  • : 자연과학분야  > 화학
  • : KCI등재
  • :
  • : 계간
  • : 1226-2277
  • : 2288-9051
  • : 학술지
  • : 연속간행물
  • : 1996-2021
  • : 833


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26권3호(2021년 09월) 수록논문
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1노후 기계식 인젝터의 분무특성 연구

저자 : 정민욱 ( Minuk Jeong ) , 유영수 ( Young Soo Yu ) , 양승호 ( Seungho Yang ) , 최민후 ( Minhoo Choi ) , 박성욱 ( Sungwook Park )

발행기관 : 한국분무공학회 간행물 : 한국분무공학회지(구 한국액체미립화학회지) 26권 3호 발행 연도 : 2021 페이지 : pp. 111-119 (9 pages)

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Deteriorated agricultural diesel engines using mechanical fuel injection systems have low fuel injection pressures. And they are not equipped with an exhaust gas abatement device, so it produces a lot of exhaust gas. Remanufactured used injectors can reduce emissions because spray characteristics are improved. In addition, remanufacturing is environmentally friendly and economical compared to producing new parts. For efficient injector remanufacturing, it is necessary to conduct a comparison experiment on the spray characteristics of an used mechanical injector and a new injector of the same model. In this study, the spray characteristics of the two injectors were compared by performing an injection quantity measurement and a spray visualization experiment. As a result, the used injector had a larger injection quantity, a shorter spray tip penetration, a wider spray angle and a smaller spray area than the new injector.

KCI등재

2상압조건에서 1-부탄올 젤 연료액적의 연소특성

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

발행기관 : 한국분무공학회 간행물 : 한국분무공학회지(구 한국액체미립화학회지) 26권 3호 발행 연도 : 2021 페이지 : pp. 120-126 (7 pages)

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Combustion characteristics of a 1-butanol gel fuel were studied in atmospheric pressure condition. The butanol gel fuel was manufactured by adding hydroxypropyl-methyl cellulose (HPMC) as a gellant and the effect of the gellant concentration was observed. The combustion process of a single butanol gel droplet was divided into 3 stages including droplet heating, microexplosion, and gellant combustion. The flame was distorted compared to butanol + water mixture because of micro-explosion during the combustion. Increase of gellant concentration delayed the droplet ignition, but the combustion rate was improved due to the mass ejection during the micro-explosion.

KCI등재

3LES-VoF를 이용한 소방용 스프링클러 헤드의 보스 및 디플렉터 치수에 따른 1차 분열 특성 분석

저자 : 김태훈 ( Taehoon Kim )

발행기관 : 한국분무공학회 간행물 : 한국분무공학회지(구 한국액체미립화학회지) 26권 3호 발행 연도 : 2021 페이지 : pp. 127-134 (8 pages)

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Fire sprinkler initial spray was analyzed by Large eddy simulation (LES) and Volume of Fluid (VoF) integrated method. The IsoAdvector geometric VoF was used to identify the liquid-gas interface clearly even with the large Courant-Friedrichs-Lewy number. To reduce the computational costs, sector meshes and Adaptive Mesh Refinement up to level 3 were used. Base mesh size was 1 mm, which is roughly equivalent to the initial sprinkler droplet. Top surface radius of boss and deflector size were modified to investigate the effects of sprinkler head design on primary breakup process. When top surface radius of boss was increased, vertical liquid sheet was formed. This phenomenon reduced the sheet breakup radius, sheet thickness and velocity. Due to reduced liquid sheet thickness, a large amount of ligaments was created from the liquid sheet. As a result, there was a dramatic decrease in volume per surface area, indicating an increase in breakup process. Spray pattern viewed in radial direction also changed when top surface radius of boss increased. When top surface radius of boss was increased, a T-shaped pattern was observed while a V-shaped pattern was observed in all other cases. When the deflector size increases, the spray pattern remains V-shaped, even if the top surface radius of boss increased. Further studies on promoting atomization of the water supplied to the lower part of the sprinkler head in the T-shape pattern should be conducted.

KCI등재

4하이브리드 자동차용 엔진 내부의 전자식 수온조절기의 감온성 및 유량제어 정확도 향상을 위한 수치 및 실험적 연구

저자 : 정수진 ( Soo-jin Jeong ) , 정진우 ( Jinwoo Jeong ) , 하승찬 ( Seungchan Ha )

발행기관 : 한국분무공학회 간행물 : 한국분무공학회지(구 한국액체미립화학회지) 26권 3호 발행 연도 : 2021 페이지 : pp. 135-141 (7 pages)

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High-efficient HEV Engine cooling systems reflects variable coolant temperature because it can decrease the hydrodynamic frictional losses of lubricated engine parts in light duty conditions. In order to safely raise the operating temperature of passenger cars to a constant higher level, and thus optimize combustion and all accompanying factors, a new thermostat technology was developed : the electronically map-controlled thermostat. In this work, various crystalline plastics such as polyphthalamide (PPA) and polyphenylenesulfide (PPS) mixed with various glass fiber amounts were introduced into plastic fittings of automotive electronic controlled thermostat for the purpose of suppressing influx of coolant into the element and undesirable opening during hot soaking. Skirt was installed around element frame of automotive electronic controlled thermostat for improving thermal sensitivity in terms of response time, hysteresis and melting temperature. To validate the effectiveness and optimum shape of skirt, thermal sensitivity test and three-dimensional CFD simulation have been performed. As a consequence, important improvement in thermal sensitivity with less than 3℃ of maximum coolant temperature between opening and engine inlet was obtained.

KCI등재

5화염 불안정성에 따른 개선된 이미지 처리 기법을 활용한 디젤-바이오디젤 혼합 연료 액적의 연소 특성

저자 : 최주환 ( Ju Hwan Choi ) , 임영찬 ( Young Chan Lim ) , 서현규 ( Hyun Kyu Suh )

발행기관 : 한국분무공학회 간행물 : 한국분무공학회지(구 한국액체미립화학회지) 26권 3호 발행 연도 : 2021 페이지 : pp. 142-148 (7 pages)

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The objective of this study is to analyze the basic flame behavior characteristics using the single fuel droplet combustion of diesel, palm-based biodiesel, and canola-based biodiesel. The results were compared and analyzed through the post processed image, which was applied the threshold level for removing noise in the raw image. The raw image was taken by a high-speed camera during the entire combustion process. At the same time, the maximum flame length, which was measured by the application code of the MATLAB program, the ignition delay, and the combustion period were compared and analyzed.

KCI등재

6평행 와이어와 충돌하는 액적 거동에 관한 연구

저자 : 나종경 ( J. K. Na ) , 노동환 ( D. H. Noh ) , 정용준 ( Y. J. Jung ) , 강보선 ( B. S. Kang )

발행기관 : 한국분무공학회 간행물 : 한국분무공학회지(구 한국액체미립화학회지) 26권 3호 발행 연도 : 2021 페이지 : pp. 149-156 (8 pages)

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In this study, the behavior of the droplet colliding with parallel wires was analyzed by time-delay photography. The impact behavior modes and the critical capture speed were analyzed by changing fluids, the droplet velocity, the wire diameter and the distance between wires. Seven typical modes of impacting droplet on parallel wires were observed. The tendency of mode change was generally similar when the wire diameter was changed, but the increase of the wire diameter caused the increase of the droplet velocity at which the mode changed. The modes at the highest droplet velocity were the splitting mode when the wires were closest, the passing and splitting mode in the middle, and the passing mode when the wires were farthest apart. The critical capture speed increased as the wire diameter increased and the distance between wires decreased. The ethanol droplet showed the lowest critical capture speed.

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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초록보기

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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