간행물

한국분무공학회> 한국분무공학회지(구 한국액체미립화학회지)

한국분무공학회지(구 한국액체미립화학회지) update

JOURNAL OF ILASS-KOREA

  • : 한국분무공학회
  • : 자연과학분야  >  화학
  • : KCI등재
  • :
  • : 연속간행물
  • : 계간
  • : 1226-2277
  • : 2288-9051
  • :

수록정보
27권2호(2022) |수록논문 수 : 6
간행물 제목
27권3호(2022년 09월) 수록논문
최근 권호 논문
| | | |

KCI등재

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 3호 발행 연도 : 2022 페이지 : pp. 117-125 (9 pages)

다운로드

(기관인증 필요)

초록보기

This study examines whether engine fuel efficiency is improved by optimization of the exhaust valve timing in a state where the intake valve timing has been optimized in a small turbo gasoline engine that has intake cams and exhaust cams with fixed valve opening periods. When the exhaust valve is opened late, the expansion stroke is longer, and the efficiency can be improved. A 2-cylinder turbo gasoline engine with 0.8 liters of displacement and an MPI (Multi Point Injection) fuel system was used. The engine was operated at 1,500 and 3,000 rpm, and the load conditions included a partial load of 50 N·m and a high load of 70 N·m. Data was recorded as the exhaust valve timing was controlled, and this was used to calculate the efficiency of combustion using a heat release, the fuel conversion efficiency, and the pumping loss. Results and the hydrocarbon concentrations in the exhaust gas were compared for each condition. Experiment results confirmed that additional fuel efficiency improvements are possible through exhaust valve timing control at 1,500 rpm and 50 N·m. However, in other operating conditions, fuel efficiency improvements could not be obtained through exhaust valve timing control because cases where the pumping loss and fuel/air mixture slip increased when the exhaust valve timing changed and the fuel efficiency declined.

KCI등재

저자 : 박상규 ( Sang Kyoo Park ) , 양희천 ( Hei Cheon Yang )

발행기관 : 한국분무공학회 간행물 : 한국분무공학회지(구 한국액체미립화학회지) 27권 3호 발행 연도 : 2022 페이지 : pp. 126-133 (8 pages)

다운로드

(기관인증 필요)

초록보기

The objective of this is to experimentally investigate the effect of mixed jet on the oxygen transfer characteristics with the primary nozzle area ratio of an annular nozzle ejector for the application of a microbial fuel cell. A direct visualization method with a high speed camera system was used to capture the horizontal mixed jet images, and a binarization technique was used to analyze the images. The clean water unsteady state technique was used for the oxygen transfer measurement. The air-water mixed jet discharging into a water tank behaved similar to a buoyancy or horizontal jet with the primary nozzle area ratio. It was found that an optimum primary nozzle area ratio was observed where the oxygen transfer performance reached its maximum value due to the decrease of air volume fraction and the increase of jet length and air bubble disper-sion.

KCI등재

저자 : 안종현 ( Jonghyeon Ahn ) , 강철웅 ( Cheolwoong Kang ) , 안규복 ( Kyubok Ahn )

발행기관 : 한국분무공학회 간행물 : 한국분무공학회지(구 한국액체미립화학회지) 27권 3호 발행 연도 : 2022 페이지 : pp. 134-143 (10 pages)

다운로드

(기관인증 필요)

초록보기

When a recess is applied to a swirl coaxial injector that uses liquid and gas propellants, a self-pulsation phenomenon in which the spray oscillates at regular intervals may occur. The phenomenon is caused by the interaction between the liquid and gas propellants inside the injector recess region. The propellants' kinetic energies are expected to affect significantly the spray oscillation. Therefore, cold-flow tests using helium as a gas-simulating propellant were conducted and compared with the results of the previous study using air. Dynamic pressure was measured in the injector manifold and frequency characteristics were investigated through the fast Fourier transform analysis. In the experimental environment, the helium density was about seven times lower than the air density. Accordingly, the intensity of pressure fluctuations was confirmed to be greater when air was used. At the same kinetic energy condition, the perturbation frequency was almost identical in the low flow rate conditions. However, as the flow rate increased, the self-pulsation frequency was higher when helium was used.

KCI등재

저자 : 이강영 ( Kangyeong Lee ) , 정하동 ( Hadong Jung ) , 강철웅 ( Cheolwoong Kang ) , 안규복 ( Kyubok Ahn )

발행기관 : 한국분무공학회 간행물 : 한국분무공학회지(구 한국액체미립화학회지) 27권 3호 발행 연도 : 2022 페이지 : pp. 144-154 (11 pages)

다운로드

(기관인증 필요)

초록보기

Gas injection is a technique applied to improve throttling in liquid rocket engines and atomization in effervescent injectors. When a gas is injected into a liquid, it creates a two-phase flow inside the injector. The changes (bubbly flow, slug flow, annular flow, etc.) in the two-phase flow affect the injector's spray characteristics. In this study, cold-flow tests were performed by using three injectors with different orifice diameters and four aerators with different gas injection hole diameters. The experiments were done by changing the thrust ratio (liquid mass flow rate ratio) and gas-liquid mass flow rate ratio. Two-phase flow transition, breakup length, and discharge coefficient according to the injector/aerator design and flow conditions were investigated in detail.

KCI등재

저자 : 이홍진 ( Hongjin Lee ) , 차준표 ( Junepyo Cha )

발행기관 : 한국분무공학회 간행물 : 한국분무공학회지(구 한국액체미립화학회지) 27권 3호 발행 연도 : 2022 페이지 : pp. 155-160 (6 pages)

다운로드

(기관인증 필요)

초록보기

Recently, major developed countries have strengthened automobile fuel efficiency regulations and carbon dioxide emission allowance standards to curb climate change caused by global warming worldwide. Accordingly, research and manufacturing on electric vehicles that do not emit pollutants during actual driving on the road are being conducted. Several automobile companies are producing and testing electric vehicles to commercialize them, but it takes a lot of manpower and time to test and evaluate mass-produced electric vehicles with driving mileage of more than 300km on a per-charge. Therefore, in order to reduce this, a simulation model was developed in this study. This study used vehicle information and MCT speed profile of small electric vehicle as basic data. It was developed by applying Simulink, which models the system in a block diagram method using MATLAB software. Based on the vehicle dynamics, the simulation model consisted of major components of electric vehicles such as motor, battery, wheel/tire, brake, and acceleration. Through the development model, the amount of change in battery SOC and the mileage during driving were calculated. For verification, battery SOC data and vehicle speed data were compared and analyzed using CAN communication during the chassis dynamometer test. In addition, the reliability of the simulation model was confirmed through an analysis of the correlation between the result data and the data acquired through CAN communication.

KCI등재

저자 : 강종대 ( Jongdae Kang ) , 조진우 ( Jinwoo Cho ) , 박성욱 ( Sungwook Park )

발행기관 : 한국분무공학회 간행물 : 한국분무공학회지(구 한국액체미립화학회지) 27권 3호 발행 연도 : 2022 페이지 : pp. 161-166 (6 pages)

다운로드

(기관인증 필요)

초록보기

To measure the change in friction loss due to the control of fuel mass and oil temperature in a gasoline engine, the floating liner method was used to measure the friction generated by the piston of a single-cylinder engine. First, to check the effect of combustion pressure on friction, the friction loss was measured by adjusting the fuel mass. It was confirmed that the friction loss increased as the fuel mass increased under the same lubrication conditions. In addition, it was confirmed that the mechanical efficiency decreased as the fuel mass increased. Next, to check the effect of lubrication conditions on friction, the friction loss was measured by controlling the oil temperature. It was confirmed that friction loss increased as the oil temperature decreased at the same fuel mass. As the oil temperature decreases, the viscosity increases, resulting in decreased mechanical efficiency and increased friction loss.

1
권호별 보기
같은 권호 수록 논문
| | | | 다운로드

KCI등재

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)

다운로드

(기관인증 필요)

초록보기

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

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)

다운로드

(기관인증 필요)

초록보기

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

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)

다운로드

(기관인증 필요)

초록보기

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

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)

다운로드

(기관인증 필요)

초록보기

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

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)

다운로드

(기관인증 필요)

초록보기

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

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)

다운로드

(기관인증 필요)

초록보기

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
주제별 간행물
간행물명 최신권호

KCI등재

한국분무공학회지(구 한국액체미립화학회지)
27권 3호

KCI등재 SCOUPUS

BMB Reports
55권 10호

KCI등재 SCOUPUS

Mass Spectrometry Letters
13권 3호

KCI등재 SCOUPUS

BMB Reports
55권 9호

KCI등재 SCOUPUS

BMB Reports
55권 8호

KCI등재

한국분무공학회지(구 한국액체미립화학회지)
27권 2호

KCI등재 SCOUPUS

BMB Reports
55권 7호

KCI등재 SCOUPUS

Mass Spectrometry Letters
13권 2호

KCI등재 SCOUPUS

BMB Reports
55권 6호

KCI등재 SCOUPUS

BMB Reports
55권 5호

KCI등재 SCOUPUS

BMB Reports
55권 4호

KCI등재

한국분무공학회지(구 한국액체미립화학회지)
27권 1호

KCI등재 SCOUPUS

Mass Spectrometry Letters
13권 1호

KCI등재 SCOUPUS

BMB Reports
55권 3호

KCI등재 SCOUPUS

BMB Reports
55권 2호

KCI등재 SCOUPUS

BMB Reports
55권 1호

KCI등재 SCOUPUS

Mass Spectrometry Letters
12권 4호

KCI등재 SCOUPUS

BMB Reports
54권 12호

KCI등재 SCOUPUS

BMB Reports
54권 11호

KCI등재 SCOUPUS

BMB Reports
54권 10호

내가 찾은 최근 검색어

최근 열람 자료

맞춤 논문

보관함

내 보관함
공유한 보관함

1:1문의

닫기