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한국분무공학회> 한국분무공학회지(구 한국액체미립화학회지)

한국분무공학회지(구 한국액체미립화학회지) update

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수록정보
수록범위 : 1권1호(1996)~27권3호(2022) |수록논문 수 : 851
한국분무공학회지(구 한국액체미립화학회지)
27권3호(2022년 09월) 수록논문
최근 권호 논문
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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)

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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)

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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)

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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)

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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)

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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)

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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.

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