• Title/Summary/Keyword: High Pressure Diesel Engine

Search Result 317, Processing Time 0.023 seconds

A Study on Combustion Characteristics of the High Pressure Diesel Engine in Closed Cycle System (폐회로 시스템에서 고압 디젤엔진의 연소특성에 관한 연구)

  • 김인교;박신배
    • Journal of Advanced Marine Engineering and Technology
    • /
    • v.26 no.4
    • /
    • pp.457-463
    • /
    • 2002
  • The closed cycle diesel engine is used in a closed circuit system which has no air breathing. The working fluid as intake mixture are consisted of oxygen, argon and recirculated exhaust gas in order to obtain underwater or underground power sources. In the present study, the high pressure diesel engine which can be operated by the closed cycle system with high intake pressure for increasing the net power rate is designed. It has been carried out to investigate the combustion characteristics of high pressure diesel engine according to the power rate. The maximum cylinder pressure and heat release rate were investigated. Also, major experimental data such as specific fuel consumption rate, oxygen concentrations, fuel conversion efficiency, polytropic exponent, and IMEP were compared with low pressure diesel engine experimental data.

An Investigation on Operating Characteristics of the Closed Cycle System Using High Pressure Diesel Engine (고압 디젤엔진을 이용한 폐회로 시스템의 운전특성에 관한 고찰)

  • 김인교;박신배
    • Transactions of the Korean Society of Automotive Engineers
    • /
    • v.10 no.5
    • /
    • pp.65-72
    • /
    • 2002
  • The closed cycle diesel system is operated in closed circuit system where there is non air breathing with working fluid consists of combination of oxygen, argon and recycled exhaust gas far obtaining underwater or underground power sources. Experimental apparatus using the MTU8V183SE92 high pressurized engine adapted for closed cycle running, capable of operating at the system pressure of maximum 5 bar is constructed with ACAP as data acquisition system in order to operate equally in the open cycle in surface or the closed cycle in submerged conditions. The general features and the characteristics of combustion of HP(high pressure) diesel engine, specially designed and manufactured only for CCDE, are investigated. The test results of performance of HP diesel engine in closed cycle system are presented with respect to power and boost pressure and compared with those of low pressure diesel engine. The oxygen concentration and specific heat ratio are investigated with its deviation

The Effect of Scavenging pressure on Performance Characteristics in Two-Stroke Diesel Engine (2행정 디젤기관의 소기압력이 성능특성에 미치는 영향)

  • Kim, Gi-Bok
    • Journal of the Korean Society of Industry Convergence
    • /
    • v.21 no.2
    • /
    • pp.45-51
    • /
    • 2018
  • Compression ignition diesel engine can reduce carbon emission than gasoline engine in case of high efficiency, output and durability. So, compression ignition diesel engine is used in various fields such as automobiles, industries and so on. Due to reducing of emission exhaust by Developing of injection and combustion type of diesel engine, emission of pollution substance is developed compared the past. Moreover, its efficiency and reduce of carbon emission is better than gasoline engine and it is used in power source of industries, transports and others because of its high efficiency and durability nowadays. In this study, we experiment by making and designing of compression ignition diesel engine witch has air-cooling, 2 cylinder and 2 strokes.

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
    • /
    • v.15 no.1
    • /
    • pp.37-44
    • /
    • 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.

  • PDF

A Chancteristic of Thermal Efficiency in Order to High Expansion Realization with a Retard of Intake Valve Closing Time in the Low Speed Diesel Engine (저속 디젤기관에서 흡기밸브 닫힘시기 지연시 고팽창 실현을 위한 열효율 특성)

  • Jang Tae-Ik
    • Journal of Advanced Marine Engineering and Technology
    • /
    • v.30 no.1
    • /
    • pp.42-49
    • /
    • 2006
  • In this research. the diesel cycle was thermodynamically interpreted to evaluate the possibility of high efficiency by converting diesel engines to the high expansion diesel cycle, and general cycle features were analyzed after comparing these two cycles. Based on these analyses. an experimental single cylinder a long stroke with high expansion-diesel engine. of which S/B ratio was more than 3, was manufactured. After evaluating the base engine through basic experiments, a diesel engine was converted into the high expansion diesel engine by establish VCR device and VVT system Accordingly, the high expansion diesel cycle can be implemented when the quantity of intake air is compensated by supercharge and the effective compression ratio is maintained at its initial level through the reduction of the clearance volume. In this case, heat efficiency increased by $5.0\%$ at the same expansion-compression ratio when the apparent compression ratio was 20 and the fuel cut off ratio was 2. As explained above, when the atkinson cycle was used for diesel cycle, heat efficiency was improved. In order to realize high expansion through retarding the intake value closing time, the engine needs to be equipped with variable valve timing equipment, variable compression ratio equipment and supercharged pressure equipment. Then a high expansion diesel cycle engine is realized.

An Analysis on Structure of Impinging and Free Diesel Spray with Exciplex Fluorescence Method in High Temperature and Pressure Field

  • Yeom, Jeong-Kuk;Park, Jong-Sang;Chung, Sung-Sik
    • Journal of Mechanical Science and Technology
    • /
    • v.19 no.12
    • /
    • pp.2281-2288
    • /
    • 2005
  • Because an injected spray development process consists of impinging and free spray in the diesel engine, it is needed to analyze the impinging spray and free spray, simultaneously, in order to study the diesel spray behavior. To dominate combustion characteristics in diesel engine is interaction between injected fuel and ambient gas, that is, process of mixture formation. Also it is very important to analyze liquid and vapor phases of injected fuel on the investigation of mixing process, respectively and simultaneously. Therefore, in this study, the behavior characteristics of the liquid phase and the vapor phase of diesel spray was studied by using exciplex fluorescence method in high temperature and injection pressure field. Finally, it can be confirmed that the distribution of vapor concentration is more uniform in the case of the high injection than in that of the low injection pressure.

An Exhaust Gas Study of HD Diesel Engine with the Electronic control EGR (전자제어 EGR을 사용한 대형디젤기관의 배출가스연구)

  • Park Kyi-yeol;Oh Yong-suk;Moon Byung-chul
    • Transactions of the Korean Society of Machine Tool Engineers
    • /
    • v.15 no.1
    • /
    • pp.76-81
    • /
    • 2006
  • Modem after-treatment technology has been developed variously in order to decrease exhausted emission in diesel engine. However, it seems very difficult to comply with updated stringent emission standards. Specially, it has been many years that exhaust gas from gasoline automobile rather than from diesel is the major object concerned by Korea and other countries, and it is strongly required on the reduction techniques on harmful NOx and PM among those compositions. Thus, this research focused on the electronic control EGR and the target for this research is heavy-duty turbo-diesel engine with EGR technology(High pressure route and low pressure route system).

Performance Evaluation on the Addition of Low-pressure Loop EGR in a Commercial Diesel Engine (상용 디젤엔진의 저압 순환 EGR 추가에 대한 성능 평가)

  • Wang, Tae-Joong;Lee, Jong-Yoon;Shim, Eui-Joon;Kim, Duk-Sang;Lee, Dong-In
    • Transactions of the Korean Society of Automotive Engineers
    • /
    • v.19 no.2
    • /
    • pp.105-110
    • /
    • 2011
  • Through this study, the performance evaluation on the addition of low-pressure loop EGR(Exhaust Gas Recirculation) in a 6.0 L commercial diesel engine was carried out using WAVE modeling and simulation. Since the key technology of advanced diesel engine combustion such as low-temperature combustion is to steadily supply high rates of EGR in a wide operating range, the current study could be effectively contribute to the design and development processes of up-to-date diesel engine systems as real-world reference data. The current simulation results show that the system in which low-pressure loop EGR is added shows almost 2.3 times increase in maximum EGR rate at 1000 rpm as well as almost 1.6 times increase at 2200 and 1600 rpm in comparison with an engine system employing high-pressure loop EGR only. Also, both turbocharger axis speed and charging pressure level did not deteriorate due to the addition of low-pressure loop EGR at 2200 and 1000 rpm, but they were fairly decreased at 1600 rpm.

Effect of Ultra-high Injection Pressure on Combustion and Emission Characteristics in a Single-cylinder Diesel Engine (초고압 분사 압력 적용에 따른 단기통 디젤 엔진에서의 연소 및 배기 특성에 관한 연구)

  • Cho, Wonkyu;Kang, Seungwoo;Bae, Choongsik;Kim, Youngho
    • 한국연소학회:학술대회논문집
    • /
    • 2015.12a
    • /
    • pp.41-44
    • /
    • 2015
  • Experimental study was conducted to investigate the effect of ultra-high injection pressure on combustion and emission characteristics in a single-cylinder diesel engine. Electronically controlled ultra-high pressure fuel injection system consistently supplied the fuel of ultra-high pressure up to 250 MPa. Various injection pressures, 40 to 250 MPa, were applied and compared. A injector with eight identical nozzle holes which have diameter of $105{\mu}m$ was used. The results showed high potential to improve the nitrogen oxide (NOx) and particulate matter (PM) trade-off relationship with an ultra-high injection pressure and the exhaust gas recirculation (EGR).

  • PDF

The Effect of Injection Pressure Variations on the Smoke and Fuel Consumption in a Small HSDI Diesel Engine with Common Rail Injection System (소형 HSDI 디젤엔진에서의 Common Rail을 이용한 분사압력 변화가 Smoke 및 연료 소모량에 미치는 영향)

  • 류명석;신범식
    • Transactions of the Korean Society of Automotive Engineers
    • /
    • v.9 no.2
    • /
    • pp.28-34
    • /
    • 2001
  • Great attentions are paid to HSDI diesel engine for passenger cars because of its high thermal efficiency. The most interesting research in HSDI diesel engine developments is focused on applying common rail system as a fuel injection equipment. In this study, a series of tests are carried out to investigate the effect of injection pressure variation on the smoke and fuel concluded in a small HSDI diesel engine with common rail system. As a result of this study it is concluded that there is an optimum rail pressure dependent on combustion system such as nozzle type, combustion chamber geometry.

  • PDF