• Title/Summary/Keyword: Diesel nozzle

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Study of Nozzle Characteristics on the Performance of a Small HSDI Diesel Engine (노즐특성이 Small HSDI 디젤엔진의 성능에 미치는 영향)

  • 류명석
    • Transactions of the Korean Society of Automotive Engineers
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    • v.9 no.4
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    • pp.69-76
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    • 2001
  • VCO nozzle is devised to minimize the HC emission and has been applied on some HSDI diesel engines. But it is not well reported whether VCO nozzle would be advantageous over SAC nozzle in a small HSDI diesel engine. In this paper it is presented that characteristics of VCO and SAC nozzle under common rail fuel injection system and their effects on the performance in a small HSDI diesel engine.

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Performance Characteristics of a Diesel Engine Using the Change of Injection Nozzle Type and Ultrasonic-Energy-Added System(I) (분사노즐 형상 변화와 초음파 에너지 부가장치를 이용한 디젤기관의 성능특성(I))

  • 최두석;류정인
    • Transactions of the Korean Society of Automotive Engineers
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    • v.5 no.4
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    • pp.160-170
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    • 1997
  • The objective of this study is to investigate the atomization characteristics and the performance characteristics of a C. I. engine by using the changes of the injection nozzle type and the ultrasonic-energy-added system. In order to evaluate the effect of ultrasonic energy and of change of injection nozzle type in the performance characte- ristics of a diesel engine, measurements of droplet size of diesel fuel were carried out by using Malvern system. In all types of injection nozzles, SMD of the ultrasonic- energy -added diesel fuel was smaller than that of the conventional diesel fuel and the more injection pressure increased, the more SMD decreased. There was a small increase in SMD with the distance from injection nozzle under all conditions of the injection nozzle types. The minimum SMD was found in the injection nozzle of B type. In the diesel engine test, there were three results about the engine performance. Compared with the injection nozzle of A type, B type had excellent effects in the engine performance. The most excellent effects about the engine performance were obtained in the case of ultrasonic-energy-added diesel fuel. In addition, the torque diagram in the case of ultrasonic-energy-added diesel fuel was more stable and periodical than others.

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Experimental Study on Spray Characteristics of Piezo Injector Group-hole Nozzle for Common Rail Diesel Engine (커먼레일 디젤기관용 피에조 인젝터 그룹홀 노즐의 분무 특성에 관한 실험적 연구)

  • Sung, K.A.
    • Journal of Power System Engineering
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    • v.12 no.5
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    • pp.14-19
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    • 2008
  • In order to meet stringent future emission regulations, especially to reduce Particulate Matter (PM) and NOX, stoichiometric diesel combustion technology with a piezo group-hole nozzle injector is being researched for reduction harmful emissions. A new nozzle layout, namely a group-hole nozzle, which has one group of small orifices with a wide spray included angle was investigated to improve the efficiency of stoichiometric diesel combustion. From this point of view, the group-hole nozzle suggested by Dense Co. is an attractive candidate method applicable to stoichiometric diesel combustion. The group-hole nozzle concept is to reduce the injector nozzle hole diameters without sacrificing spray penetration by closely locating two holes. Experimental studies have proven that the spray from group-hole nozzles have similar spray penetration to that of a single hole with equivalent overall nozzle hole area, but the spray drop sizes (SMD) are reduced, aiding vaporization and mixing.

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Effects of the fuel injection system on combustion in a diesel engine (디젤기관의 연소에 미치는 분사계의 영향)

  • Kwon, S. I.;Kim, W.
    • Journal of the korean Society of Automotive Engineers
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    • v.15 no.1
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    • pp.37-44
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    • 1993
  • Fuel injection system is an important tool in the exhaust emission and performance of a diesel engine. Effects of the fuel injection system in diesel combustion was investigated experimentally by measuring the performance and analyzing the combustion phenomena in a D.I. diesel engine. The selected injection parameters were nozzle opening pressure, nozzle projection length, and nozzle spray angle. From the measured results, it is shown that the fuel injection pipe diameter is an effective means to improve engine performance in a middle and high speed range and the 2 stage spring nozzle holder has the advantage of increasing the engine performance due to the initial injection pressure in a low speed range. It has been also shown that increasing nozzle opening pressure resulted in decrease in smoke, but increase in NO$_{x}$ from the engine.e.

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Combustion Optimization of Diesel 2.0 Liter Class Engine with 8-hole Injector Nozzle (8홀 노즐을 적용한 2리터 급 디젤 엔진 연소 최적화)

  • Kwon, Soon-Hyuk;Kim, Min-Su;Choi, Min-Seon;Cho, Sung-Hwan
    • Transactions of the Korean Society of Automotive Engineers
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    • v.16 no.3
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    • pp.73-79
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    • 2008
  • Atomization speed of diesel fuel injected from 8-hole nozzle is faster than that of 7-hole nozzle because the hole diameter of 8-hole nozzle is smaller than that of 7-hole nozzle. But both insufficient distance between the fuel sprays and short penetration of injected sprays through 8-hole nozzle hole cause many harmful effects on combustion. In this study, we installed the 8-hole injectors to diesel 2.0 liter class engine, and optimized in-cylinder swirl and penetration via selecting and matching proper cylinder head and combustion bowl. Through this process, we found out the performance and emission potential of 8-hole nozzle installed engine are better than those of 7-hole nozzle installed one.

Effects of Injector Design Parameter on Nozzle Coking in Diesel Engines (디젤 엔진의 인젝터 설계 변수가 노즐 코킹에 미치는 영향 분석)

  • Kim, Yongrae;Song, Hanho
    • Journal of ILASS-Korea
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    • v.17 no.3
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    • pp.140-145
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    • 2012
  • Recent common-rail injector of a diesel engine needs more smaller nozzle hole to meet the stringent emission regulation. But, small nozzle hole diameter can cause nozzle coking which is occurred due to the deposits of post-combustion products. Nozzle coking has a negative effect on the performance of fuel injector because it obstructs the fuel flow inside a nozzle hole. In this study DFSS (Design for six sigma) method was applied to find the effect of nozzle design parameter on nozzle coking. Total 9 injector samples were chosen and tested at diesel engine. The results show that nozzle hole diameter and K-factor have more effect on nozzle coking than A-mass and hole length. Large hole diameter and A-mass, small hole length and K-factor give more positive performance on nozzle coking in these experimental conditions. But, a performance about nozzle coking and exhaust gas emission shows the opposite tendency. Further study is needed to find the relation between nozzle coking and emission characteristic for the optimization of injector nozzle design.

Examination of 2-Fluid Nozzle and 3-Fluid Nozzle for Fuel Reformer of 5 kW SOFC System (5 kW급 SOFC 시스템의 연료 개질기를 위한 2-유체 노즐과 3-유체 노즐의 검토)

  • Kwon, Hwa-Kil;Lee, Chi-Young;Lee, Sang-Yong
    • Journal of ILASS-Korea
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    • v.13 no.1
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    • pp.16-21
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    • 2008
  • In the present study, the 2-fluid nozzle and 3-fluid nozzle to atomize the diesel and water with air for the fuel reformer of SOFC system were experimentally examined. In the 2-fluid nozzle, the diesel and water were alternately atomized due to bislug flow pattern, and it implies that the mixing of both liquids strongly affects the atomization pattern. On the other hand, in the 3-fluid nozzle, the diesel and water were atomized simultaneously due to the separated injection channels without mixing problem. Therefore, compared to the 2-fluid nozzle, the 3-fluid nozzle is suitable for the stable operation of the fuel reformer. In case of the 3-fluid nozzle, Type A where the air was supplied through the central channel was the most efficient.

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A study on the development of atomizer of the complete combustion for diesel engines (디젤기관의 완전연소용 무화기의 개발)

  • 조규상;류정인
    • Journal of the korean Society of Automotive Engineers
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    • v.12 no.5
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    • pp.26-35
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    • 1990
  • This is an experimental study to investigate the characteristics of Diesel spray and Diesel engine performance using ultrasonic injection nozzle (A, B type) and conventional commercial injection nozzle (C type). The results are obtained as follows: 1. SMD and range of size distribution of Diesel spray using the ultrasonic nozzle are smaller than those using the conventional injection nozzle, and spray angle is spread. 2. Because of the difference of the ultrasonic vibration energy transfer in the same condition, the effects of A-type ultrasonic vibration are larger than those of B-type ultrasonic vibration. 3. Attaching the ultrasonic vibrator to the conventional injection nozzle of the Diesel engine, engine performances i.e. BMEP, BSFC, and cylinder peak pressure are improved.

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Effects of the Bio-diesel Blending Rate on the Spray Characteristics of the Pressure Swirl Nozzle (바이오 디젤 혼합율이 압력식 스월노즐의 분무 특성에 미치는 영향)

  • Yoon, S.J.
    • Journal of ILASS-Korea
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    • v.16 no.4
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    • pp.210-214
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    • 2011
  • This paper presents the spray characteristics of the gun type burner nozzle with bio-diesel blending rate. The burner nozzle used in this experiment is a pressure swirl type nozzle. For the spray characteristics, visualization of spray was conducted to obtain the spray angle, and laser diffraction spectroscope (LDS) was used for the measurement of the droplet diameters. The results showed that the $D_{max}$, SMD and spray angle were decreased with increasing the bio-diesel blending rate and BD30 (30% bio-diesel blending rate) could be found to be the maximum blending rate for using without any modification of the gun type burner of the homesize kerosene fuel boiler.

The Effect of Valve Geometry Variation on Injection Characteristics of Injection Valve for Marine Diesel Engines (선박디젤기관용 분사밸브의 형상변화가 분사특성에 미치는 영향에 관한 계산적 고찰)

  • Park, K.;Kim, S.Y.;Choi, C.W.
    • Journal of ILASS-Korea
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    • v.10 no.1
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    • pp.24-34
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    • 2005
  • Injection technology is one of the important technologies in a diesel engine. Many studies have done on the injection system. In this study, the fuel chamber geometry, the orifice ratio and the needle lift of the injection valve for a marine diesel engine are varied, and simulated. The result shows that the nozzle hole size has influence on the rail pressure and injection duration sensitively. The decrease of the static pressure at the nozzle hole entrance and the increase of the dynamic pressure on the outlet surface are occurred with the increase of the nozzle hole diameter. The highest dynamic pressure of the outlet was occurred at the needle lift of 0.4mm and the nozzle hole diameter of 0.328mm in this test nozzle.

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