• Title/Summary/Keyword: Injection Speed

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A Study of Performance Test of High Speed Solenoid for Fuel Injector in Diesel Engine (디젤기관의 분사밸브를 위한 고속 솔레노이드의 성능에 관한 연구)

  • Cho, K.H.;Rha, J.H.;Ahn, S.K.
    • Journal of Power System Engineering
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    • v.5 no.3
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    • pp.11-16
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    • 2001
  • In the DI diesel engine of passenger cars, common rail injection system have been used to improve the engine performance and reduce the exhaust emission by controlling injection timing, injection pattern, and injection duration. In case that common rail injection system is applied to high speed DI diesel engine, it is necessary to have high response and good repetition characteristics. These characteristics of injector depend on the characteristics of solenoid. Thus, to apply the common rail injection system in the high speed diesel engine, we had designed and made a multi-pole solenoid, and carried out repetition, response test to compare the multi-pole solenoid with the gasoline Injector solenoid. The result shows that repetition and response characteristics of multi-pole solenoid have better characteristics than the gasoline injector solenoid.

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Measurement of Viscosity and Numerical Analysis of High Speed Injection Molding for Thin-Walled LGP (박형 도광판의 고속사출성형을 위한 수지 점도 측정 및 수치해석)

  • Jung, T.S.;Kim, J.S.;Ha, S.J.;Cho, M.W.
    • Transactions of Materials Processing
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    • v.23 no.1
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    • pp.41-48
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    • 2014
  • The light guide plate has become the major component for the backlight module in general information technology products (e.g. mobile phones, monitors, etc.). High speed injection molding has been adopted for thin walled LGP giving advantages such as weight, shape, size, and reduction in production costs. In the current study, the rheological characteristics of high liquidity plastic resin PC(HL8000) were measured using a capillary rheometer to improve the reliability of the numerical analysis for high speed injection molding. With the measured viscosity and PVT of PC(HL8000), numerical analysis of injection molding was conducted using the simulation software(Moldflow). Filling time and deflection were predicted and compared with those of traditional PC resins(H3000, H4000). The results show that PC(HL8000) has significantly different rheological characteristics during high speed injection molding. Hence proper properties of the resin should be used to improve the accuracy of numerical predictions.

Development of the ultra-high speed electric injection molding machine using the energy regeneration method (에너지 회생 기법을 사용한 초고속 전동 사출성형기 개발)

  • Yu, Hyeon-Jae;Yoo, Sung-Chul;Hyun, Chang-Hoon;Park, Kyoung-Ho
    • Design & Manufacturing
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    • v.10 no.2
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    • pp.1-5
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    • 2016
  • High-speed and high-torque performance is required in the ultra-high speed electric injection molding machine field. To implement this performance, the big-size inverter is needed and the corresponding converter should be used. In this case, the whole cost for configuring the system will be increased. In this paper, we introduce a method which is able to reduce the energy and the cost for configuring the system using the energy regeneration. The energy regeneration method is based on reusing the regeneration power generated at the electric motor during decelerating the injection motion. In this paper, we demonstrate the effectiveness of the method by using the ultra-high speed injection motion.

An Experimental Study of the High-Speed Rotating Fuel Injection System with In-line Injection Orifice (직렬식 분무오리피스를 적용한 회전 연료분사노즐의 분무특성연구)

  • Jang, Seong-Ho;Choi, Seong-Man
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2009.11a
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    • pp.202-206
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    • 2009
  • We studied the spray characteristics of the high-speed rotating fuel injection system. The diameter of in-line injection orifices are varied from 1mm to 5mm and the number of in-line injection orifices are varied from 3 to 12. Droplet size, velocity and spray distribution were measured by the PDPA(Phase Doppler Particle Analyzer) system and spray was visualized. From the test results, the liquid column generated from the injection orifice is mainly controlled by the rotational speeds. Also diameter of injection orifices and number of injection orifices have influence on the diameters of droplet. Consequently, we find out that the basic mechanism of controlling the droplet size is the liquid film thickness in the injection orifice.

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Effect of Injection Hole and Needle-driven Characteristics on Pilot Spray in High Pressure Injector with Common-rail System (커먼레일 고압분사용 인젝터의 분공수 및 니들구동특성이 Pilot 분무에 미치는 영향)

  • Lee, Jin-Wook;Bae, Jang-Woong;Kim, Ha-Nul;Kang, Kern-Yong;Min, Kyung-Duk
    • Journal of ILASS-Korea
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    • v.9 no.1
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    • pp.8-14
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    • 2004
  • future exhaust emission limits for diesel-driven passenger cars will force the automotive company to significantly develop of the new technologies of diesel engine respectively of the drive assemblies. As we know, the contributions of soot and nitrogen oxide is the main problems in diesel engine. Recently, as a result, the pilot injection of common-rail fuel injection system recognizes an alternative function to solve an environmental problem. This study describes the effect of the nozzle structure and driven characteristic of injector on pilot injection fur a passenger car common-rail system. The pilot spray structure such as spray tip penetration, spray speed and spray angle were obtained by high speed images, which is measured by the Mie scattering method with optical system fur high-speed temporal photography. Also the CFD analysis was carried out for fuel behavior under high pressure in between needle and nozzle of injector for common-rail system to know the condition of initial injection at experiment test. It was found that solenoid-driven injector with 5-hole was faster than 6-hole injector in spray speed at same conditions and piezo-driven injector showed faster response than solenoid injector.

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Flow Analysis of the Plain Seal with Injection (분사를 수반하는 평씨일 내의 유동해석)

  • 이관수;김우승;김기연;김창호
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.16 no.4
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    • pp.795-802
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    • 1992
  • A numerical analysis is performed on the turbulent flow in the plain seal with injection. The parameters used in this study are as follows : Reynolds number, rotation speed, injection speed, clearance ratio, injection angle, and axial injection location. Flow pattern and leakage performance due to the variation of parameters are investigated. SIMPLER algorithm is used to solve the Navier-Stokes equation governing steady, incompressible turbulent flow and standard K- .epsilon. turbulent model is used to consider the turbulence effects. The leakage performance is significantly enhanced with injection. The increases of the injection flow rate and be rotation speed of the shaft cause the leakage performance to the increased. With the increase of the Reynolds number the leakage performance is diminished. At the injection angle of 90deg, the leakage coefficient has a minimum value. The pressure drop has a maximum value at axial center location but the injection location has little effect on the pressure drop. Clearance ratio has a significant effect on the pressure drop.

Inertia Force Problem and Nozzle Contact Mechanism of Linear Motor Drive Injection Molding Machine

  • Bang, Young-Bong;Susumu Ito
    • International Journal of Precision Engineering and Manufacturing
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    • v.4 no.5
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    • pp.34-40
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    • 2003
  • This paper presents the inertial force problem of ultrahigh-speed injection molding machine using linear motors, and presents its solutions. To make very thin products by injection molding, very high injection speed is required, and linear motors are used for this purpose. However, direct drive by linear motors may cause brief nozzle separation from the sprue bushing because of the inertia force which is as large as the total output thrust of the linear motors, and this momentary separation can cause molten plastic to leak. In this paper, two solutions are proposed for this inertia force problem. One is the mechanical cancellation of the inertia force, and the other is to increase the nozzle contact force. With the latter solution, the stationary platen bending worsens, so a new nozzle contact mechanism is also proposed, which can prevent the stationary platen bending.

Inertia Force Problem and Nozzle Contact Mechanism on Linear Motor Drive Injection Molding Machine (리니어모터식 사출성형기의 반력문제 및 노즐터치기구)

  • Bang, Yeong-Bong;Yun, Deung-Jin
    • Journal of the Korean Society for Precision Engineering
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    • v.19 no.10
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    • pp.171-177
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    • 2002
  • This paper presents the inertial force problem of ultrahigh-speed injection molding machine using linear motors, and presents its solutions. To make very thin products by injection molding, very high injection speed is required, and linear motors are used for this purpose. But direct drive by linear motors may cause brief nozzle separation from the sprue bushing because of the inertia force as large as the total output thrust of the linear motors, and this momentary separation can cause molten plastic leakage. In this paper, two solutions are proposed for this inertia force problem. One is the mechanical cancellation of the inertia force, and the other to increase the nozzle contact force. With the latter solution, the stationary platen bending worsens, so a new nozzle contact mechanism is also proposed, which can prevent the stationary platen bending.

Magnetic Helicity Injection in Solar Active Regions Related to the CME Initiation and Speed

  • Park, Sung-Hong
    • The Bulletin of The Korean Astronomical Society
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    • v.35 no.2
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    • pp.50.2-50.2
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    • 2010
  • Magnetic helicity injection in 28 solar active regions producing 46 CMEs was investigated to find its relationship with the occurrence and speed of CMEs. The helicity injection in the active regions under investigation was calculated using full-disk 96 minute MDI magnetograms. The major findings of this study are as follows. First, the 46 CMEs are categorized into two different groups by two characteristic evolution patterns of helicity injection in their active regions: (1) a monotonically increasing of helicity accumulation (Group A; 30 CMEs in 23 active regions) and (2) significant helicity injection followed by its sign reversal (Group B; 16 CMEs in 5 active regions). Second, a fairly good correlation between the helicity injection rate and the CME speed is found for the 30 CME events in Group A. Further statistical studies, however, are needed to check whether the two characteristic helicity patterns are shown in other CME-productive active regions.

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Flame Propagation Characteristics in a Heavy Duty Liquid Phase LPG Injection SI Engine by Flame Visualization (대형 액상 LPG 분사식 SI 엔진에서 화염 가시화를 이용한 희박영역에서의 화염 전파특성 연구)

  • 김승규;배충식;이승목;김창업;강건용
    • Transactions of the Korean Society of Automotive Engineers
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    • v.10 no.4
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    • pp.23-32
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    • 2002
  • Combustion and flame propagation characteristics of the liquid phase LPG injection (LPLI) engine were investigated in a single cylinder optical engine. Lean bum operation is needed to reduce thermal stress of exhaust manifold and engine knock in a heavy duty LPG engine. An LPLI system has advantages on lean operation. Optimized engine design parameters such as swirl, injection timing and piston geometry can improve lean bum performance with LPLI system. In this study, the effects of piston geometry along with injection timing and swirl ratio on flame propagation characteristics were investigated. A series of bottom-view flame images were taken from direct visualization using an W intensified high-speed CCD camera. Concepts of flame area speed, In addition to flame propagation patterns and thermodynamic heat release analysis, was introduced to analyze the flame propagation characteristics. The results show the correlation between the flame propagation characteristics, which is related to engine performance of lean region, and engine design parameters such as swirl ratio, piston geometry and injection timing. Stronger swirl resulted in foster flame propagation under open valve injection. The flame speed was significantly affected by injection timing under open valve injection conditions; supposedly due to the charge stratification. Piston geometry affected flame propagation through squish effects.