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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)

I410-ECN-0102-2022-400-000653754

간행물정보

  • : 자연과학분야  > 화학
  • : KCI등재
  • :
  • : 계간
  • : 1226-2277
  • : 2288-9051
  • : 학술지
  • : 연속간행물
  • : 1996-2022
  • : 845


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1머신러닝을 이용한 다공형 GDI 인젝터의 플래시 보일링 분무 예측 모델 개발

저자 : 상몽소 ( Mengzhao Chang ) , 신달호 ( Dalho Shin ) , Quangkhai Pham , 박수한 ( Suhan Park )

발행기관 : 한국분무공학회 간행물 : 한국분무공학회지(구 한국액체미립화학회지) 27권 2호 발행 연도 : 2022 페이지 : pp. 57-65 (9 pages)

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The purpose of this study is to use machine learning to build a model capable of predicting the flash boiling spray characteristics. In this study, the flash boiling spray was visualized using Shadowgraph visualization technology, and then the spray image was processed with MATLAB to obtain quantitative data of spray characteristics. The experimental conditions were used as input, and the spray characteristics were used as output to train the machine learning model. For the machine learning model, the XGB (extreme gradient boosting) algorithm was used. Finally, the performance of machine learning model was evaluated using R2 and RMSE (root mean square error). In order to have enough data to train the machine learning model, this study used 12 injectors with different design parameters, and set various fuel temperatures and ambient pressures, resulting in about 12,000 data. By comparing the performance of the model with different amounts of training data, it was found that the number of training data must reach at least 7,000 before the model can show optimal performance. The model showed different prediction performances for different spray characteristics. Compared with the upstream spray angle and the downstream spray angle, the model had the best prediction performance for the spray tip penetration. In addition, the prediction performance of the model showed a relatively poor trend in the initial stage of injection and the final stage of injection. The model performance is expired to be further enhanced by optimizing the hyper-parameters input into the model.

KCI등재

2Methane-based TRAPP method를 이용한 탄화수소 항공유의 전달 물성치 예측 연구

저자 : 황성록 ( Sung-rok Hwang ) , 이형주 ( Hyung Ju Lee )

발행기관 : 한국분무공학회 간행물 : 한국분무공학회지(구 한국액체미립화학회지) 27권 2호 발행 연도 : 2022 페이지 : pp. 66-76 (11 pages)

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This study presents a prediction methodology of transport properties using the methane-based TRAPP (m-TRAPP) method in a wide range of temperature and pressure conditions including both subcritical and supercritical regions, in order to obtain thermo-physical properties for hydrocarbon aviation fuels and their products resulting from endothermic reactions. The viscosity and thermal conductivity are predicted in the temperature range from 300 to 1000 K and the pressure from 0.1 to 5.0 MPa, which includes all of the liquid, gas, and the supercitical regions of representative hydrocarbon fuels. The predicted values are compared with those data obtained from the NIST database. It was demonstrated that the m-TRAPP method can give reasonable predictions of both viscosity and thermal conductivity in the wide range of temperature and pressure conditions studied in this paper. However, there still exists large discrepancy between the current data and established values by NIST, especially for the liquid phase. Compared to the thermal conductivity predictions, the calculated viscosities are in better agreement with the NIST database. In order to consider a wide range of conditions, it is suggested to select an appropriate method through further comparison with another improved prediction methodologies of transport properties.

KCI등재

3평판 충돌 제트로 생성되는 액막의 두께 분포 특성 연구

저자 : 김민석 ( M. S. Kim ) , 오진형 ( J. H. Oh ) , 정회민 ( H. M. Jeong ) , 강보선 ( B. S. Kang )

발행기관 : 한국분무공학회 간행물 : 한국분무공학회지(구 한국액체미립화학회지) 27권 2호 발행 연도 : 2022 페이지 : pp. 77-83 (7 pages)

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In this study, the thickness of the liquid sheet formed by a low speed impinging jet onto a flat plate was measured by the direct contact method. The spatial distribution characteristics of the sheet thickness in the radial and circumferential directions, and the effects of jet velocity and liquid viscosity were analyzed. The measurement results were compared with the theoretical predictions. The wavy surface was observed in the case of low viscosity water, but not in the high viscosity aqueous glycerol solutions. The sheet thickness increased as the circumferential angle increased or the distance from the impinging point increased, but the thickness decreased as the circumferential angle increased around the impinging point. As the jet speed increased, the sheet thickness decreased, and the sheet thickness increased as the liquid viscosity increased. Comparison with the theoretical predictions showed that the measurement results agreed well in the case of low viscosity water or high viscosity liquids around the impinging point. The distribution characteristics of the sheet thickness can provide useful means for prediction of spray characteristics in splash plate injectors.

KCI등재

4분사 압력에 따른 수소 제트의 형상과 LIBs를 적용한 국부 당량비 계측

저자 : 이상욱 ( Sanguk Lee ) , 김정호 ( Jungho Justin Kim ) , 배충식 ( Choongsik Bae )

발행기관 : 한국분무공학회 간행물 : 한국분무공학회지(구 한국액체미립화학회지) 27권 2호 발행 연도 : 2022 페이지 : pp. 84-93 (10 pages)

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To implement carbon-neutrality in transportation sectors until 2050, hydrogen is considered a promising fuel for internal combustion engines because hydrogen does not contain carbon itself. Although hydrogen does not emit CO2 emission from its combustion process, the low energy density in a volume unit hinders the adoption of hydrogen. Therefore, the understanding of hydrogen jet behavior and measurement of equivalence ratio must be conducted to completely implement the highpressure hydrogen direct injection. The main objective of this research is feasibility test of hydrogen local equivalence ratio measurement by laser-induced breakdown spectroscopy (LIBs). To visualize the macroscopic structure of hydrogen jet, highspeed schlieren imaging was conducted. Moreover, LIBs has been adopted to validate the feasibility of hydrogen local equivalence ratio measurement. The hydrogen injection pressure was varied from 4 MPa to 8 MPa and injected in a constant volume chamber where the ambient pressure was 0.5 MPa. The increased injection pressure extends the vertical penetration of hydrogen jet. Due to the higher momentum supply when the injection pressure is high, the hydrogen has easily diffused in all directions. As the laser trigger timing has delayed, the low hydrogen atomic emission was detected due to the longer mixture formation time. Based on equivalence ratio measurement results, LIBs could be applied as a methodology for hydrogen local equivalence ratio measurement.

KCI등재

5UTV용 SI엔진에서 가솔린과 LPG 사용에 따른 배출가스 특성 연구

저자 : 장진영 ( Jinyoung Jang ) , 우영민 ( Youngmin Woo ) , 신영진 ( Youngjin Shin ) , 고아현 ( Ahyun Ko ) , 정용진 ( Yongjin Jung ) , 조종표 ( Chongpyo Cho ) , 김강출 ( Gangchul Kim ) , 표영덕 ( Youngdug Pyo ) , 한명훈 ( Myunghoon Han )

발행기관 : 한국분무공학회 간행물 : 한국분무공학회지(구 한국액체미립화학회지) 27권 2호 발행 연도 : 2022 페이지 : pp. 94-100 (7 pages)

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Even in non-road UTV (Utility Terrain Vehicle), spark ignition engines are often used to reduce emissions. In this study, gasoline and LPG (Liquified Petroleum Gas) fuels were applied to UTV engines, and the exhaust gas and combustion stability were compared through engine tests. A 0.8-liter two-cylinder SI engine was used in the experiment. Experiments were conducted while changing the IVO (Intake Valve Open) and EVC (Exhaust Valve Close) at 1500 rpm 14 N·m, 40 N·m, and 3000 rpm 17 N·m, 44 N·m conditions. As a result of the experiment, when the valve overlap increased according to the change of IVO and EVC, combustion stability decreased and THC emission increased, but NOx decreased. Comparing the LPG engine with the gasoline engine, the amount of CO2 and PN (Particulate Number) generation decreased in the LPG engine, and the combustion stability was good.

KCI등재

6디젤 분사방식에 따른 이종연료 엔진의 성능 및 배기 분석

저자 : 박현욱 ( Hyunwook Park ) , 이준순 ( Junsun Lee ) , 오승묵 ( Seungmook Oh ) , 김창업 ( Changup Kim ) , 이용규 ( Yonggyu Lee ) , 장형준 ( Hyungjoon Jang )

발행기관 : 한국분무공학회 간행물 : 한국분무공학회지(구 한국액체미립화학회지) 27권 2호 발행 연도 : 2022 페이지 : pp. 101-108 (8 pages)

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Performance and emissions with different diesel injection methods were analyzed in a natural gas-diesel, dual-fuel engine under low-load conditions. Natural gas was supplied to intake port during the intake stoke to form a natural gas-air premixed mixture for all methods. Diesel was injected directly into the cylinder during the compression stroke in three ways: early injections, late injections, and a combination of early and late injections. The early injections had the highest thermal efficiency among the three methods owing to its highest combustion efficiency. The wide dispersion of diesel before the combustion initiation also allowed superior emissions characteristics.

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.

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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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