scholarly journals Turbocharger Matching for Two Cylinder Constant Speed Diesel Engine with Uneven Firing Order

2018 ◽  
Vol 8 (4) ◽  
pp. 109-116
Author(s):  
Thamaraikannan. M et al., Thamaraikannan. M et al., ◽  
Keyword(s):  
Diesel Engine ◽  
Constant Speed ◽  
Firing Order

scholarly journals Influence of hexanol-diesel blends on constant speed diesel engine

2011 ◽  
pp. 110-110 ◽  
Author(s):  
Sundar Raj ◽  
Saravanan Ganapathy
Keyword(s):  
Diesel Engine ◽  
Constant Speed

scholarly journals Firing order selection for a V20 commercial diesel engine with FEV Virtual Engine

2017 ◽  
Vol 169 (2) ◽  
pp. 64-70
Author(s):  
Konrad BUCZEK ◽  
Sven LAUER
Keyword(s):  
Diesel Engine ◽  
Torsional Vibration ◽  
High Speed ◽  
Selection Process ◽  
Simulation Software ◽  
Dynamics Simulation ◽  
Order Selection ◽  
Engine Operation ◽  
Wide Range ◽  
Firing Order

The continuously increasing mechanical and thermal loads of modern engines require optimization of the designs with incorporation of a wide range of different aspects. Application of advanced computer simulations in the development process for most engine components is well established, leading to the creation of well optimized products. However, the optimization of such design variables ike the firing order, which influences engine operation in several disciplines, is still challenging. Considering the ever increasing peak firing pressure requirements, the layout of the firing order in multi-cylinder commercial engines is an efficient way to reduce crank train / overall engine vibration and main bearing loads, whilst controlling engine balancing and preserving adequate gas exchange dynamics. The proposed general firing order selection process for four-stroke engines and, in particular, its first part being the optimization of the firing order based on crank train torsional vibration, is the main topic of this paper. The exemplary study for a V20 high speed commercial Diesel engine regarding the influence of the firing sequence on crank train torsional vibration has been conducted with the multibody dynamics simulation software “FEV Virtual Engine”. It addresses various engine crankshaft layouts and engine applications.

Effects of Substitution Ratio on the Emission Characteristics of a Dual-Fuel Engine Fueled with Pilot Diesel Fuel and Methanol

2015 ◽  
Vol 1092-1093 ◽  
pp. 504-507
Author(s):  
Ya Chong Shen ◽  
Chun Hua Zhang ◽  
Gang Li ◽  
Jia Wang Zhou
Keyword(s):  
Diesel Engine ◽  
Diesel Fuel ◽  
Experimental Results ◽  
Constant Speed ◽  
Dual Fuel ◽  
Emission Characteristics ◽  
Turbocharged Diesel Engine ◽  
Intake Pipe ◽  
Substitution Ratio ◽  
Hc Emissions

Substitution ratio is an important parameter influencing on the performance of dual-fuel engine. In order to study the effects of substitution ratio on the emission characteristics of diesel/ methanol dual-fuel engine, a 6-cylinder turbocharged diesel engine was converted into a dual-fuel engine fueled with pilot diesel fuel and methanol. Methanol was injected into the intake pipe and ignited by pilot diesel fuel. Experiments were performed at a constant speed of 1400 r/min, and at three different engine loads of 40%, 60% and 100%. The experimental results indicate that CO and HC emissions of dual-fuel mode both increase significantly with the increase of substitution ratio, and are higher than those of diesel mode. Compared to diesel mode, dual-fuel mode generates lower NOx and smoke emissions. In addition, as substitution ratio increases, NOx and smoke emissions are decreased.

Effects of Amorphous Ti-Al-B Nanopowder Additives on Combustion in a Single-Cylinder Diesel Engine

2016 ◽  
Author(s):  
Brian T. Fisher ◽  
Jim S. Cowart ◽  
Michael R. Weismiller ◽  
Zachary J. Huba ◽  
Albert Epshteyn
Keyword(s):  
Diesel Engine ◽  
Fuel Consumption ◽  
Consumption Rate ◽  
Energy Content ◽  
High Energy ◽  
Hydrocarbon Fuels ◽  
Constant Speed ◽  
Single Cylinder ◽  
Fuel Consumption Rate ◽  
Fuel Formulation

Energetic nanoparticles have shown promise as additives to liquid hydrocarbon fuels due to their high specific surface area, high energy content, and catalytic capability. Novel amorphous reactive mixed-metal nanopowders (RMNPs) containing Ti, A1, and B, synthesized via a sonochemical reaction, have been developed at the Naval Research Laboratory. These materials have higher energy content than commercial nano-aluminum (nano-A1), making them potentially useful as energy-boosting fuel components rather than simply catalytic additives. This work examines the combustion behavior of these RMNPs in a small, single-cylinder, 4-stroke diesel engine (Yanmar L48V). Fuel formulations included varying fractions of RMNPs, up to 4 wt. %, suspended in jet fuel JP-5. Comparative experiments also were conducted with equivalent suspensions of nano-A1 in JP-5. For each fuel formulation, with the engine operating at constant speed of 3000 RPM, load was varied across its full range. At each load, cylinder pressure data were recorded for 30 seconds (750 cycles) to enable determination of important combustion characteristics. Although differences were small, both nano-A1 and RMNPs resulted in shorter ignition delays, retarded peak pressure locations, decreased maximum rates of heat release, and increased burn durations. In addition, a similar but larger engine (Yanmar L100V) was used to examine fuel consumption and emissions for a suspension of 8 wt. % RMNPs in JP-5 (and 8 wt. % nano-A1 for comparison). The engine was connected to a genset operating at a constant speed of 3600 RPM and constant load with nominal gIMEP (gross indicated mean effective pressure) of 6.5 bar. Fuel consumption rate was determined from time required to consume 175 mL of each fuel formulation, while emissions levels were recorded once per minute during that time. Unfortunately, combustion data and visual inspection of the injector indicated that RMNPs led to significant deposits on the injector tip and in and around the orifices, which had a negative impact on both fuel consumption rate and emissions. The engine stalled after four minutes of operation with the nano-A1-laden fuel, apparently due to clogging at the bottom of the fuel reservoir. It was concluded that particle settling in the fuel reservoir and particle clogging in the fuel system and injector were significant problems for these composite liquid/powder fuels. Nevertheless, fuel consumption rate was found to be 17% lower for the nano-A1 suspension compared to baseline JP-5 for the period of time that the engine was able to operate, which is a significant achievement towards demonstrating the potential value of reactive metal powder additives in boosting the volumetric energy density of hydrocarbon fuels.

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