• Title/Summary/Keyword: Spray Control

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A Numerical Analysis on the Spray Characteristics at Different Injection System Parameters in a Common-rail Diesel Engine (연료분사계 변수의 변화에 따른 커먼레일 디젤엔진의 분무특성에 관한 수치적 분석)

  • Lee, Suk-Young;Jeon, Chung-Hwan
    • Journal of ILASS-Korea
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    • v.15 no.1
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    • pp.8-16
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    • 2010
  • This paper present the diesel spray characteristics at different injection system parameters in a HSDI diesel engine. The spray characteristics was calculated by the coupled simulation of fuel injection system model and three-dimensional KIVA-3V code with TAB spray model. The relevant injection parameters are accumulator volume, control chamber initial volume, control orifice diameter, needle valve diameter and nozzle chamber initial volume, etc. Parametric investigation with respect to twelve relevant injection parameters showed that there was a significant advantage in varying control chamber initial volume, control chamber orifice diameter, and nozzle chamber orifice diameter with respect to effect the SMD and fuel injection speed. Consequently, in order to design the fuel injection system for spray characteristics, it seems reasonable to suppose to be optimized the fuel injection system.

Reducing Fungicidal Spray Frequency for Major Apple Diseases by Increasing the Spray Interval from 15 to 25 days

  • Lee, Dong-Hyuck;Shin, Ho-Cheol;Cho, Rae-Hong;Uhm, Jae-Youl
    • The Plant Pathology Journal
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    • v.25 no.3
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    • pp.270-279
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    • 2009
  • During the course of a study to develop a spraying program at 15-day spray intervals, two important findings were identified allowing for further reduction of spray frequency by increasing the spray interval. In evaluating the contribution of fungicides from a 15-day spray interval program, control of white rot, which is of prime importance in Korea, was not affected, in spite of the extended spray interval caused by omitting the fungicides during the season. In another experiment assessing the duration of the protective activities of several key fungicides used in the 15-day spray interval program, infection control was maintained for almost 30 days for some fungicide. Based on these two findings, a basic spraying program with a 25-day spray interval was developed. This program was modified for four successive years to improve the control efficacy against bitter rot and Marssonina blotch, which sometimes causes as much damage as white rot.

Experimental Vrification of the Sray Clculation using the Aricultural Done (농업용 방제드론의 방제면적 산출에 따른 실험적 검증)

  • Wooram Lee
    • The Journal of the Convergence on Culture Technology
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    • v.9 no.4
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    • pp.569-576
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    • 2023
  • An agricultural drones are gradually increasing in utilization due to economic efficiency, and consist of a main frame in charge of flying spray system in charge of moving pesticide to control targets. Therefore, the environment and characteristics of crops should be considered when controlling pesticides using drones and conditions such as systematic flying altitude of flight, speed, and spray time should be changed accordingly. However, pest control work using agricultural drones has different spray effects depending on level the operation proficiency and spray impact. In addition, there are variations in operating standards and control efficiency for agricultural drones, which hinder the distribution of agricultural control drones in the field of pest control work. Therefore, this study attempts to identify the spraying characteristics of agricultural drones, apply the effective spraying time, interval and experimentally verify the system that can calculation of spray area compared to previous studies. Through this experimental verification, it is intended to apply the optimal control process by minimizing the obstacles to pest control work by applying the operation method and systematic figures to agricultural drones.

Development and Improvement of fungicidal spray program for apple production.

  • Lee, Hyun-Jik;Cho, Rae-Hong;Shin, Jung-Sup;Kim, Jung-Nam;Yoon, Ji-Hyun;Uhm, Jae-Youl
    • Proceedings of the Korean Society of Plant Pathology Conference
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    • 2003.10a
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    • pp.109.2-109
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    • 2003
  • A basic spray program for apple in which fungicides are scheduled to spray at 15-day interval from petal fall to late August was formulated on the properties of several selected fungicides. In order to improve it, experimental plots, completely randomized block with 3 replications, were prepared in an orchard of 15 years old Fuji cultivar, and the spray programs in which only one chemical in the basic spray program was substituted with others were applied to each plot. It was revealed that only single substitution of the fungicide in the basic spray program makes a great differences in the control of white rot and bitter rot, and that the control property of the fungicides against the two diseases was quite variable even by the time of application. A simila! ! r trial was conducted in 2002 with a new basic spray program that was formulated with fungicides that have shown best control in each spraying time in the previous trial, similar results were obtained. Applying this method, the usefulness of certain fungicide in the spray program for apple could be properly assessed. Anthracnose of Robinia pseudo-acacia L. caused by Collectotrichum spp.

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Image sensed process controller for automatic paint spray systems (영상 검출에 의한 자동도포장치의 프로세서제어기)

  • 이상훈;유희삼;강준길
    • 제어로봇시스템학회:학술대회논문집
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    • 1986.10a
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    • pp.188-190
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    • 1986
  • In this paper, we describe an optical detection at the front and design an on-off control system of spray gun for economical paint spray when painted on hanger any things that it have arbitrary two-dimensional image. The objectives of this paper that, as changing of software, find useful logic variation of spray, and are to enhance of environments for workman and to decrease economical loss of painting.

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Spatting Resistance of High Strength RC Column Covering Spray-on Materials of Fiber Composite Spray Mortar(FCSM) (섬유복합모르터의 뿜칠마감에 의한 고강도콘크리트 기둥부재의 폭렬방지)

  • Song Yong-Won;Han Dong-Yeob;Lee Gun-Cheol;Goh Kyoung-Taek;Kim Jin-Soo;Han Cheon-Goo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2006.05a
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    • pp.5-8
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    • 2006
  • High strength concrete has been increasingly used in high rue building and it is very obvious re consider fire resistance performance of that. Unlike the normal strength concrete, high strength concrete in sudden elevating temperature at fire is susceptible to spalling with severe explosion and surface split, due to high density of concrete. In order to endure the spalling, inner space temperature of concrete should be control less than certain point. Therefore this study investigated the influence of covering materials on high strength concrete finishing spray-on materials of fiber composite spray mortar(FCSM). Both polypropylene(PP) and polyvinyl alcohol(PVA) fiber were used in this test. Test showed that concrete, covering 18mm mortar containing PVA fiber and confining metal lath 2.3mm thickness, decreased 50% of main bar ambient temperature. compared with control concrete. In addition, concrete covering 18mm mortar without fiber caused falling of covering materials and then it was exposed in elevating temperature. As a result, spatting of the concrete occurred same as control concrete. However, concrete covering spray-on mortar containing PVA or PP fiber resisted spatting occurrence.

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Development of Gasoline Direct Swirl Injector III (직접분사식 가솔린 선회분사기 개발에 관한 연구 III)

  • Part, Young-Kug;Oh, Jae-Geon;Lee, Choong-Won
    • Journal of ILASS-Korea
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    • v.6 no.4
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    • pp.39-48
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    • 2001
  • The Gasoline Direct Injection(GDI) system has been highlighted due to the improvement of fuel consumption and the control of exhaust emission from gasoline engines. Main purpose of the present study is to measure spray characteristics of GDSI for real engine application. We have investigated experimentally spray tip penetration, spray angle, tip velocity and spatial spray distribution. Counter-rotating vortex grown on the spray surface plays an important role in the spray characteristics. Accordingly the spray tip penetration and tip velocity do not excess 50mm, 20m/s respectively, under 0.6MPa ambient pressure. the spray cone angle of GDSI have a same tendency to a simplex swirl atomizer.

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A Behavior Study of Diesel Spray on High Temperature (고온 분위기에서 디젤 분무의 거동에 관한 연구)

  • 류호성;송규근;안진근
    • Journal of Advanced Marine Engineering and Technology
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    • v.24 no.4
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    • pp.454-459
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    • 2000
  • Diesel engine which has high thermal efficiency is one of the major movers. Recently, as people pay attention to the environmental pollution, the emission of Diesel engine becomes an important problem. So it is needed to understand the characteristics of diesel fuel spray injected into a combustion chamber to reduce the emission. The factors which control the diesel fuel spray are the injection pressure, the nozzle diameter, the impinging angle and the variation of an ambient pressure and temperature. In this paper, the experiments were conducted in the free spray and the impinging spray with various ambient temperatures(273K, 373K, 573K). And the behaviors of the diesel fuel spray, such as penetration, spray angle and axial distance in the free spray and axial distance and spray thickness in the impinging spray were studied.

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Establishment of Fungicidal Spray Schedule for Effective Control of Apple White Rot 1. Guiding Principles for Selecting Protective Fungicides in Accordance with Apple Growing Season (사과 겹무늬썩음병의 효과적 방제를 위한 약제살포 체계의 수립 1. 사과의 생육시기별 보호살균제의 선택 원칙)

  • 정미혜;김대희;엄재열
    • Korean Journal Plant Pathology
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    • v.10 no.4
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    • pp.284-291
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    • 1994
  • In order to establish an appropriate spray schedule to reduce the infection, 11 kinds of chemicals were tested for their properties on the inhibition of spore germination at the surface of apple fruits and the duration of the inhibitory effect after spray of each chemical was examined from late June to early September with basically 10 day intervals. Actual control efficacy of each chemical by the 8 successive spray and the patterns of waterborne spore dispersals during that periods were also examined. Combining those results with the meteorological observation data, actual control efficacy of each chemical in the given periods could be estimated. It was revealed that folpet, Brodeaux mixture, mancozeb, oxine copper and imminoctadine-triacetate could be used at any time during the possible infection periods. Captan and dithianon could also be used except the rainy season due to the short duration of inhibitory efficacy against spore germination under heavy rain. However, the usefulness of propineb, benomyl and chlorothalonil against the apple white rot could not be demonstrated in this experiment. Thiram, even though has not been used for apple white rot, can also be used before or after the rainy season to control not only white rot but also alternaria blotch.

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A Study on the Behavior Characteristics of Diesel Spray by Using a High Pressure Injection System with Common Rail Apparatus

  • Yeom, Jeong-Kuk;Hajime Fujimoto
    • Journal of Mechanical Science and Technology
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    • v.17 no.9
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    • pp.1371-1379
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    • 2003
  • The effects of change in injection pressure on spray structure in high temperature and pressure field have been investigated. The analysis of liquid and vapor phases of injected fuel is important for emissions control of diesel engines. Therefore, this work examines the evaporating spray structure using a constant volume vessel. The injection pressure is selected as the experimental parameter, is changed from 22 MPa to 112 MPa using a high pressure injection system (ECD-U2). Also, we conducted simulation study by modified KIVA-II code. The results of simulation study are compared with experimental results. The images of liquid and vapor phase for free spray were simultaneously taken by exciplex fluorescence method. As experimental results, the vapor concentration of injected fuel is leaner due to the increase of atomization in the case of the high injection pressure than in that of the low injection pressure. The calculated results obtained by modified KIVA-II code show good agreements with experimental results.