• Title/Summary/Keyword: spray system

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An Experimental Study on The Effect of Ultrasonic Atomization in Agricultural Twin-fluid Nozzle (농업용 액체 분무용 초음파 분사효과에 관한 실험적 연구)

  • Chung, J.D.;Lim, Y.J.
    • Journal of ILASS-Korea
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    • v.8 no.4
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    • pp.1-8
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    • 2003
  • The objective of this study is to investigate experimentally atomization characteristics for differently made an ultrasonic twin-fluid nozzle. A spray system, an ultrasonic system, and three different type(Nozzle type, Tube type, Conventional type)are made and tested by applied with ultrasonic energy. In this investigation, the measurement and calculation of spray droplet are to analyze the effects of ultrasonic energy on the agricultural atomization system. Through the measurement of suray angle, spray column using, high speed camera and PDA, it is found that nozzle type is highest efficiency than that of tube type and conventional type. It was found that the ultrasonic energy increased the atomization efficiency of spray droplets about 9% respectively and spray angle was wide spray.

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Characterization of Liquid Phase LPG Sprays within Airflow Fields (LPG 액상분무의 분열 및 혼합특성)

  • 최재준;최동석;남창호;배충식
    • Transactions of the Korean Society of Automotive Engineers
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    • v.10 no.5
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    • pp.90-97
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    • 2002
  • The interaction between airflow and liquid phase LfG (Liquefied Petroleum Gas) sprays was investigated in a steady flow system embodied in a wind tunnel to simulate the variety of flow inside intake port of LPG engines with liquid injection system. The spray developments in flowing fields with the mean velocities of 5.4, 21.5 and 42.4m/s were identified by spray visualization techniques such as Mie scattering and shadowgraph. The microscopic visualization using a telescopic lens system was performed to investigate the shape and size of liquid droplets in the spray. PDA measurement was used to get 1-dimensional velocity and diameter of liquid droplets. The fast co-flows make the spray field be compact and be lead upward to the injection direction. SMD of the spray was smaller at the fast flowing field. Spray width got bigger and SMD of the spray was smaller with higher injection pressure.

An Investigation on the Spray Characteristics of DME Common Rail Fuel Injection System with Variation of Ambient Pressure (분위기 압력변화에 따른 DME 커먼레일 연료 분사 시스템의 분무 특성에 관한 연구)

  • Lee, Se-Jun;Oh, Se-Doo;Jeong, Soo-Jin;Lim, Ock-Taeck
    • Transactions of the Korean Society of Automotive Engineers
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    • v.20 no.2
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    • pp.90-97
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    • 2012
  • It is investigated of the DME spray characteristics about varied ambient pressure and fuel injection pressure using the common rail fuel injection system when the nozzle holes diameter is varied. The common rail fuel injection system and fuel cooling system is used since DME has compressibility and vaporization in atmospheric temperature. The fuel injection quantity and spray characteristics were measured. The spray was analyzed of spray shape, penetration length, and spray angle at the six nozzle holes. The 2 types injector were used, the one was 0.166 mm diameter the other one was 0.250 mm diameter. The ambient pressure which is based on gage pressure was 0 MPa, 2.5 MPa, and 5 MPa. The fuel injection pressure was varied by 5 MPa from 35 MPa to 70 MPa. When using the converted injector, compared to using the common injector, the DME injection quantity was increased 127 % but it didn't have the same heat release. Both of the common and converted injector had symmetric spray shapes. In case of converted injector, there were asymmetrical spray shapes until 1.2 ms, but after 1.2 ms the spray shape was symmetrical. Compared with the common and converted injector, the converted injector had shorter penetration length and wider spray angle than the common injector.

Characteristics of Chemical Contents of Horizontal Spray Salts from Deep Ocean Water (수평 분무식 해양심층수 소금의 성분 특성)

  • MOON Deok-Soo;KIM Hyun-Ju;SHIN Phil-Kwon;JUNG Dong-Ho
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.38 no.1
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    • pp.65-69
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    • 2005
  • We have developed a new method of manufacturing salts by horizontal spray drying technique, using the concentrated deep ocean water after desalination processes. We studied the chemical characteristics of the spray-dried salts. Sodium content in the spray salts is $28.4\%$, which is $10-30\%$ lower than that of bay salts, bamboo salts and boiling salts $(32-38.2\%)$. However, the contents of magnesium, potassium and calcium of the spray salts are 2.5 times, 3 times and 4.5 times higher relative to those of bay salts, respectively. On the one hand, sulfur content in spray salts is 14 times lower than those of bay salts, which is caused by their volatilization during spray and vaporization of the concentrated seawater. Enrichment factors of Mg (0.8), K (0.9) and Ca (1.0) in the spray salts are relatively higher than those in bay salt (0.2-0.3), bamboo salt (0.15-0.4) and boiled salt (0.4-0.7), respectively. On the contrary, enrichment factor of sulfur in spray salts is observed to be 0.07, which is considerably lower than those in other salts (0.3-0.7). It means that the minerals like Mg, K and Ca can be well conserved from seawater to salts through spray drying techniques, while volatile elements like sulfur, lead, mercury and organic compounds can be easily removed from seawater via spray and heating processes.

An Experimental Study on Spray Characteristics of Multi-Hole GDI Injector (다공형 GDI 인젝터의 분무특성에 대한 실험적 연구)

  • Lee, Sung-Won;Park, Sung-Young
    • Journal of ILASS-Korea
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    • v.16 no.4
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    • pp.201-209
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    • 2011
  • Optimum engine performance is obtained when the spray characteristics is well matched to the geometry of a combustion chamber. Among many parameters governing the combustion performance in internal combustion engine, fuel supply characteristics and atomization are important performance factors. Therefore, spray characteristics of high pressure multi-hole injector has been studied experimentally. An experimental test system has been made to operate high pressure injection system and to visualize spray behavior. Spray visualization has been performed to analyze spray formation, spray cone angle, bent angle and penetration length. Spray interaction with piston has been analyzed with various injector installation angle, injection pressure and ambient pressure. Test results show that penetration length is greatly influenced by the injection pressure. Penetration length is decreased as ambient pressure increased. Spray cone angle is increased as injection pressure and ambient pressure increased. However, bent angle is not influenced by the change of injection pressure and ambient pressure. Spray cone angle distribution map is plotted using the experimental data. Fuel movement around the spark-plug has been enforced as increasing injector installation angle.

Experimental Study on Mixing Stability and Macroscopic Spray Characteristics of Diesel-gasoline Blended Fuels (디젤-가솔린 혼합연료의 혼합안정성 및 거시적인 분무 특성에 관한 실험적 연구)

  • Park, Sewon;Park, Su Han;Park, Sungwook;Chon, Mun Soo;Lee, Chang Sik
    • Journal of ILASS-Korea
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    • v.17 no.3
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    • pp.121-127
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    • 2012
  • The study is to investigate the mixing stability, fuel properties, and macroscopic spray characteristics of diesel-gasoline blended fuels in a common-rail injection system of a diesel engine. The test fuels were mixed diesel with gasoline fuel, which were based volume fraction of gasoline from 0 to 100% in 20% intervals. In order to analyze the blended effect of gasoline to diesel fuel, the properties of test fuels such as density, viscosity, and surface tension were measured. In addition, the spray behavior characteristics were studied by investigating the spray tip penetration and spray angle using a spray images through a spray visualization system. It was revealed that the density, kinematic viscosity and surface tension of diesel-gasoline blending fuels were decreased with the increase of gasoline fuel. The injection quantity of test fuels were almost similar level at short energizing duration condition. On the other hand, the increase of energizing duration shows the decrease of injection quantity compared to short energizing duration. The test blending fuels have similar growth in Spray tip penetration and Spray cone angle.

An Investigation on the Spray Characteristics of Diesel-DME Blended Fuel with Variation of Ambient Pressure in the Constant Volume Combustion Chamber (정적연소기에서 분위기 압력에 따른 Diesel-DME 혼합연료의 분무 특성에 관한 연구)

  • Yang, Jiwoong;Lee, Sejun;Lim, Ocktaeck
    • Journal of ILASS-Korea
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    • v.17 no.4
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    • pp.178-184
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    • 2012
  • The aim of this study was to compare the spray characteristics of a typical fuel (100% diesel, DME) and diesel-DME blended fuel in a constant volume combustion chamber (CVCC). The typical fuel (100% diesel, DME) and diesel-DME blended fuel spray characteristics were investigated at various ambient pressures (pressurized nitrogen) and fuel injection pressures using a common rail fuel injection system when the fuel mixture ratio was varied. The fuel injection quantity and spray characteristics were measured including spray shape, penetration length, and spray angle. Common types of injectors were used.

Macroscopic Behavior and Atomization Characteristics of Bio-diesel Fuels (바이오 디젤 연료의 분무 거동 및 미립화 특성)

  • Suh, Hyun-Kyu;Park, Sung-Wook;Kwon, Sang-Il;Lee, Chang-Sik
    • Transactions of the Korean Society of Automotive Engineers
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    • v.12 no.6
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    • pp.23-29
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    • 2004
  • This work was conducted to figure out the atomization characteristics of three types of bio-diesel fuels using a common-rail injection system. The process of spray development was visualized by using a spray visualization system composed of a Nd:YAG laser and an ICCD camera, The spray tip penetrations were analyzed based on the frozen images from the spray visualization system. On the other hand, the microscopic atomization characteristics such as the distributions of SMD and axial mean velocity were measured by using a phase Doppler particle analyzer system, It is revealed that the sprays of the bio-diesel fuels have larger SMD than that of diesel fuel mainly due to high viscosity of bio-diesel. Different characteristics of bio-diesel fuels were also measured in spray tip penetrations according to the fuels and mixing ration.

An experimental study on the mixing of evaporating liquid spray in a duct flow (덕트 유동에서 증발을 수반하는 액상 스프레이의 혼합 특성에 대한 실험적 연구)

  • Kim, Y.B.;Choi, S.M.
    • Journal of ILASS-Korea
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    • v.11 no.1
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    • pp.30-38
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    • 2006
  • High temperature furnaces such as power plant and incinerator contribute considerable part of NOx generation and face urgent demand of De-NOx system. Reducing agent is injected into the flue gas flow to activate do-NOx system. Almost SCR system adopt vaporized ammonia injection system. Vaporizer, dilution system and additional space are needed to gasify and inject ammonia. Liquid spray injection system can simplify and economize post-treatment system of flue gas. In this study, mixing caused by gas or liquid injection of reducing agent into flue gas duct was investigated experimentally. Carbonated water was used as tracer and simulated agent and mixing of liquid spray in a duct flow was studied. To achieve that, the angle of attack of static mixer is simulated and $CO_2$ concentration is measured.

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Effect of Injector-driven Type on Spray Behavior and Fuel Atomization Characteristics (인젝터 구동 방식에 따른 분무 거동 및 분무 미립화 특성)

  • Park, Ji-Hong;Suh, Hyun-Kyu;Park, Sung-Wook;Kim, Jae-Wook;Lee, Chang-Sik
    • Transactions of the Korean Society of Automotive Engineers
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    • v.14 no.1
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    • pp.17-24
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    • 2006
  • This study was performed to figure out spray behavior and fuel atomization characteristics of a piezo-driven injector and a solenoid-driven injector in the common-rail injection system under the same design parameters and test conditions. The process of spray injection was visualized by using the spray visualization system composed of a Nd:YAG laser and an ICCD camera. The atomization characteristics were investigated in terms of axial mean velocity, Sauter mean diameter(SMD) and droplet distributions obtained from a phase Doppler particle analyzer system. Compared with solenoid-driven injector, the piezo-driven injector has short injection delay and reaches quickly to the maximum injection value. Spray tip penetration shows some difference, however, spray angle of piezo-driven injector is wider than that of solenoid-driven injector. Sauter mean diameter of piezo-driven type injector is smaller than that of solenoid-driven type.