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한국분무공학회> 한국분무공학회지(구 한국액체미립화학회지)

한국분무공학회지(구 한국액체미립화학회지) update

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수록정보
26권3호(2021) |수록논문 수 : 6
간행물 제목
27권1호(2022년 03월) 수록논문
최근 권호 논문
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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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