Fast-Burn Combustion Chamber Design for Natural Gas Engines

1998 ◽  
Vol 120 (1) ◽  
pp. 232-236 ◽  
Author(s):  
R. L. Evans ◽  
J. Blaszczyk
Keyword(s):  
Combustion Chamber ◽  
Engine Performance ◽  
Fuel Mixture ◽  
Performance Parameters ◽  
Combustion Chambers ◽  
Natural Gas Engines ◽  
Chamber Design ◽  
Performance And Emissions ◽  
Unburned Hydrocarbons ◽  
Fuel Mixtures

The work presented in this paper compares the performance and emissions of the UBC “Squish-Jet” fast-burn combustion chamber with a baseline bowl-in-piston (BIP) chamber. It was found that the increased turbulence generated in the fastburn combustion chambers resulted in 5 to 10 percent faster burning of the air–fuel mixture compared to a conventional BIP chamber. The faster burning was particularly noticeable when operating with lean air–fuel mixtures. The study was conducted at a 1.7 mm clearance height and 10.2:1 compression ratio. Measurements were made over a range of air–fuel ratios from stoichiometric to the lean limit. At each operating point all engine performance parameters, and emissions of nitrogen oxides, unburned hydrocarbons, and carbon monoxide were recorded. At selected operating points a record of cylinder pressure was obtained and analyzed off-line to determine mass-burn rate in the combustion chamber. Two piston designs were tested at wide-open throttle conditions and 2000 rpm to determine the influence of piston geometry on the performance and emissions parameters. The UBC squish-jet combustion chamber design demonstrates significantly better performance parameters and lower emission levels than the conventional BIP design. Mass-burn fraction calculations showed a significant reduction in the time to burn the first 10 percent of the charge, which takes approximately half of the time to burn from 10 to 90 percent of the charge.

The Design and Performance of a Sturdy Industrial Combustion Chamber for a 14 MW Gas Turbine

1981 ◽  
Author(s):  
L. Andersson
Keyword(s):  
Air Pollution ◽  
Combustion Chamber ◽  
Water Injection ◽  
Engine Performance ◽  
Dual Fuel ◽  
Combustion Chambers ◽  
Fuel Injectors ◽  
Unburned Hydrocarbons ◽  
And Performance ◽  
Engine Power

The latest stage in the evaluation of a dual fuel industrial combustion chamber is reported. The design, fitting and maintability of the cans and fuel injectors is described. The performances studied are can wall temperatures, ignition and environment air pollution. The latter cover NO, NO2, CO, unburned hydrocarbons, smoke and solids. Those have been measured over a range of engine power settings, and also over a range of water injection ratios into the combustion chambers. Full engine performance was accordingly measured.

scholarly journals EXPERIMENTAL INVESTIGATIONS OF HYDROGEN EFFECTS ON PERFORMANCE AND EMISSIONS OF RENEWABLE DIESEL FUELED RCCI / VANDENILIO ĮTAKA ENERGINIAMS IR EMISIJOS RODIKLIAMS ALTERNATYVIU DYZELINU VEIKIANČIAME RCCI VARIKLYJE – EKSPERIMENTINIS TYRIMAS

2018 ◽  
Vol 10 (0) ◽  
pp. 1-10
Author(s):  
Romualdas Juknelevičius
Keyword(s):  
Combustion Chamber ◽  
Combustion Process ◽  
Engine Performance ◽  
Fuel Mixture ◽  
Injection System ◽  
Experimental Investigations ◽  
Renewable Diesel ◽  
Common Rail Injection System ◽  
Performance And Emissions ◽  
The Rich

The article presents the study of hydrogen effects on performance, combustion and emissions characteristics of renewable diesel fueled single cylinder CI engine with common rail injection system in RCCI mode. The renewable diesel fuels as the HRF are the HVO and it blend with petrol diesel further named PRO Diesel, investigated in this study. The purpose of this investigation was to examine the influence of the LRF – hydrogen addition to the HRF on combustion phases, engine performance, efficiency, and exhaust emissions. HES was changed within the range from 0 to 35%. Hydrogen injected through PFI during intake stroke to the combustion chamber, where it created homogeneous mixture with air. The HRF was directly injected into combustion chamber using electronic controlled unit. Tests were performed at both fixed and optimal injection timings at low, medium and nominal engine load. After analysis of the engine bench results, it was observed that lean hydrogen – HRF mixture does not support the flame propagation and efficient combustion. While at the rich fuel mixture and with increasing hydrogen fraction, the combustion intensity concentrate at the beginning of the combustion process and shortened the ignition delay phase. Decrease of CO, CO2 and smoke opacity was observed with increase of hydrogen amounts to the engine. However, increase of the NO concentration in the engine exhaust gases was observed.

Measurements of Laminar Flame Speeds of Alternative Gaseous Fuel Mixtures

2015 ◽  
Vol 137 (3) ◽  
Author(s):  
Ahmed S. Ibrahim ◽  
Samer F. Ahmed
Keyword(s):  
Carbon Dioxide ◽  
Alternative Fuels ◽  
Laminar Flame ◽  
Engine Performance ◽  
Fuel Mixture ◽  
Gaseous Fuel ◽  
Combustion Engines ◽  
Liquefied Petroleum Gas ◽  
Ambient Conditions ◽  
Fuel Mixtures

Global warming and the ever increasing emission levels of combustion engines have forced the engine manufacturers to look for alternative fuels for high engine performance and low emissions. Gaseous fuel mixtures such as biogas, syngas, and liquefied petroleum gas (LPG) are new alternative fuels that have great potential to be used with combustion engines. In the present work, laminar flame speeds (SL) of alternative fuel mixtures, mainly LPG (60% butane, 20% isobutane, and 20% propane) and methane have been studies using the tube method at ambient conditions. In addition, the effect of adding other fuels and gases such as hydrogen, oxygen, carbon dioxide, and nitrogen on SL has also been investigated. The results show that any change in the fuel mixture composition directly affects SL. Measurements of SL of CH4/LPG–air mixtures have found to be about 56 cm/s at ø = 1.1 with 60% LPG in the mixture, which is higher than SL of both pure fuels at the same ø. Moreover, the addition of H2 and O2 to the fuel mixtures increases SL notably, while the addition of CO2/N2 mixture to the fuel mixture, to simulate the EGR effect, decreases SL of CH4/LPG–air mixtures.

scholarly journals A Comparative Study of Almond Biodiesel-Diesel Blends for Diesel Engine in Terms of Performance and Emissions

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Nidal H. Abu-Hamdeh ◽  
Khaled A. Alnefaie
Keyword(s):  
Diesel Engine ◽  
Diesel Fuel ◽  
Engine Performance ◽  
Particulate Emissions ◽  
Exhaust Gas ◽  
Oxides Of Nitrogen ◽  
Performance Parameters ◽  
Gas Temperature ◽  
Performance And Emissions ◽  
Unburned Fuel

This paper investigates the opportunity of using almond oil as a renewable and alternative fuel source. Different fuel blends containing 10, 30, and 50% almond biodiesel (B10, B30, and B50) with diesel fuel (B0) were prepared and the influence of these blends on emissions and some performance parameters under various load conditions were inspected using a diesel engine. Measured engine performance parameters have generally shown a slight increase in exhaust gas temperature and in brake specific fuel consumption and a slight decrease in brake thermal efficiency. Gases investigated were carbon monoxide (CO) and oxides of nitrogen (NOx). Furthermore, the concentration of the total particulate and the unburned fuel emissions in the exhaust gas were tested. A blend of almond biodiesel with diesel fuel gradually reduced the engine CO and total particulate emissions compared to diesel fuel alone. This reduction increased with more almond biodiesel blended into the fuel. Finally, a slight increase in engineNOxusing blends of almond biodiesel was measured.

scholarly journals Modelling and Simulation of the Performance and Combustion Characteristics of a Locomotive Diesel Engine Operating on a Diesel–LNG Mixture

Energies ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 5318
Author(s):  
Imantas Lipskis ◽  
Saugirdas Pukalskas ◽  
Paweł Droździel ◽  
Dalibor Barta ◽  
Vidas Žuraulis ◽  
...  
Keyword(s):  
Engine Performance ◽  
Fuel Mixture ◽  
Combustion Characteristics ◽  
Cylinder Pressure ◽  
Diesel Locomotive ◽  
Compression Ignition Engine ◽  
Locomotive Engine ◽  
Rate Of Heat Release ◽  
Fuel Mixtures ◽  
Locomotive Diesel

The article describes a compression-ignition engine working with a dual-fuel system installed in diesel locomotive TEP70 BS. The model of the locomotive engine has been created applying AVL BOOST and Diesel RK software and engine performance simulations. Combustion characteristics have been identified employing the mixtures of different fuels. The paper compares ecological (CO2, NOx, PM) and energy (in-cylinder pressure, temperature and the rate of heat release (ROHR)) indicators of a diesel and fuel mixtures-driven locomotive. The performed simulation has shown that different fuel proportions increased methane content and decreased diesel content in the fuel mixture, as well as causing higher in-cylinder pressure and ROHR; however, in-cylinder temperature dropped. CO2, NOx and PM emissions decrease in all cases thus raising methane and reducing diesel content in the fuel mixture.

THERMO ACOUSTIC PROCESSES IN LOW EMISSION COMBUSTION CHAMBER OF GAS TURBINE ENGINE CAPACITY 25 MW

2019 ◽  
pp. 86-90
Author(s):  
Sergey Serbin
Keyword(s):  
Mathematical Models ◽  
Combustion Chamber ◽  
Gas Turbine ◽  
Three Dimensional ◽  
Fuel Mixture ◽  
Gas Turbine Engine ◽  
Operational Parameters ◽  
Combustion Chambers ◽  
Turbine Engine ◽  
Low Emission

The appliance of modern tools of the computational fluid dynamics for the investigation of the pulsation processes in the combustion chamber caused by the design features of flame tubes and aerodynamic interaction compressor, combustor and turbine is discussed. The aim of the research is to investigate and forecast the non-stationary processes in the gas turbine combustion chambers. The results of the numerical experiments which were carried out using three-dimensional mathematical models in gaseous fuels combustion chambers reflect sufficiently the physical and chemical processes of the unsteady combustion and can be recommended to optimize the geometrical and operational parameters of the low-emission combustion chamber. The appliance of such mathematical models are reasonable for the development of new samples of combustors which operate at the lean air-fuel mixture as well as for the modernization of the existing chambers with the aim to develop the constructive measures aimed at reducing the probability of the occurrence of the pulsation combustion modes. Keywords: gas turbine engine, combustor, turbulent combustion, pulsation combustion, numerical methods, mathematical simulation.

scholarly journals Understanding the unsteady pressure field inside combustion chambers of compression-ignited engines using a computational fluid dynamics approach

2018 ◽  
Vol 21 (8) ◽  
pp. 1273-1285 ◽  
Author(s):  
Antonio J Torregrosa ◽  
Alberto Broatch ◽  
Xandra Margot ◽  
Josep Gomez-Soriano
Keyword(s):  
Combustion Chamber ◽  
Pressure Field ◽  
Independent Solution ◽  
Combustion Noise ◽  
Spray Angle ◽  
Combustion Chambers ◽  
Unsteady Pressure ◽  
Compression Ignition Engines ◽  
Performance And Emissions ◽  
System Configurations

In this article, a numerical methodology for assessing combustion noise in compression ignition engines is described with the specific purpose of analysing the unsteady pressure field inside the combustion chamber. The numerical results show consistent agreement with experimental measurements in both the time and frequency domains. Nonetheless, an exhaustive analysis of the calculation convergence is needed to guarantee an independent solution. These results contribute to the understanding of in-cylinder unsteady processes, especially of those related to combustion chamber resonances, and their effects on the radiated noise levels. The method was applied to different combustion system configurations by modifying the spray angle of the injector, evidencing that controlling the ignition location through this design parameter, it is possible to decrease the combustion noise by minimizing the resonance contribution. Important efficiency losses were, however, observed due to the injector/bowl matching worsening which compromises the performance and emissions levels.

Performance Characterization of Alternative Ignition Systems Using Optical Tools in Natural Gas Engines

2018 ◽  
Author(s):  
Bipin Bihari ◽  
Munidhar S. Biruduganti ◽  
Roberto Torelli ◽  
Dan Singleton
Keyword(s):  
Natural Gas ◽  
Engine Performance ◽  
Lean Burn ◽  
Natural Gas Engines ◽  
Reciprocating Engine ◽  
Optical Tools ◽  
Discharge Ignition ◽  
Performance And Emissions ◽  
Engine Performance And Emissions

Lean-burn combustion dominates the current reciprocating engine R&D efforts due to its inherent benefits of high BTE and low emissions. The ever-increasing push for high power densities necessitates high boost pressures. Therefore, the reliability and durability of ignition systems face greater challenges. In this study, four ignition systems, namely, stock Capacitive discharge ignition (CDI), Laser ignition, Flame jet ignition (FJI), and Nano-pulse delivery (NPD) ignition were tested using a single cylinder natural gas engine. Engine performance and emissions characteristics are presented highlighting the benefits and limitations of respective ignition systems. Optical tools enabled delving into the ignition delay period and assisted with some characterization of the spark and its impact on subsequent processes. It is evident that advanced ignition systems such as Lasers, Flame-jets and Nano-pulse delivery enable extension of the lean ignition limits of fuel/air mixtures compared to base CDI system.

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