Development of a Low Pressure Direct Injection System for a Small 2S Engine. Part II - Experimental Analysis of the Engine Performance and Pollutant Emissions

2015 ◽  
Author(s):  
Luca Romani ◽  
Giovanni Vichi ◽  
Giovanni Ferrara ◽  
Francesco Balduzzi ◽  
Paolo Trassi ◽  
...  
Keyword(s):  
Experimental Analysis ◽  
Direct Injection ◽  
Engine Performance ◽  
Low Pressure ◽  
Pollutant Emissions ◽  
Injection System ◽  
Engine Part

Development of a Low Pressure Direct Injection System for a Small 2S Engine. Part I - CFD Analysis of the Injection Process

2015 ◽  
Vol 8 (4) ◽  
pp. 1885-1897 ◽  
Author(s):  
Francesco Balduzzi ◽  
Giovanni Vichi ◽  
Luca Romani ◽  
Giovanni Ferrara ◽  
Paolo Trassi ◽  
...  
Keyword(s):  
Direct Injection ◽  
Low Pressure ◽  
Injection System ◽  
Cfd Analysis ◽  
Injection Process ◽  
Engine Part

scholarly journals Influence of the diesel pilot injector configuration on ethanol combustion and performance of a heavy-duty direct injection engine

2021 ◽  
pp. 146808742110012
Author(s):  
Nicola Giramondi ◽  
Anders Jäger ◽  
Daniel Norling ◽  
Anders Christiansen Erlandsson
Keyword(s):  
Direct Injection ◽  
Engine Performance ◽  
High Load ◽  
Operating Conditions ◽  
Injection System ◽  
Injection Timing ◽  
Diesel Combustion ◽  
Heavy Duty ◽  
Pure Ethanol ◽  
Ethanol Combustion

Thanks to its properties and production pathways, ethanol represents a valuable alternative to fossil fuels, with potential benefits in terms of CO2, NOx, and soot emission reduction. The resistance to autoignition of ethanol necessitates an ignition trigger in compression-ignition engines for heavy-duty applications, which in the current study is a diesel pilot injection. The simultaneous direct injection of pure ethanol as main fuel and diesel as pilot fuel through separate injectors is experimentally investigated in a heavy-duty single cylinder engine at a low and a high load point. The influence of the nozzle hole number and size of the diesel pilot injector on ethanol combustion and engine performance is evaluated based on an injection timing sweep using three diesel injector configurations. The tested configurations have the same geometric total nozzle area for one, two and four diesel sprays. The relative amount of ethanol injected is swept between 78 – 89% and 91 – 98% on an energy basis at low and high load, respectively. The results show that mixing-controlled combustion of ethanol is achieved with all tested diesel injector configurations and that the maximum combustion efficiency and variability levels are in line with conventional diesel combustion. The one-spray diesel injector is the most robust trigger for ethanol ignition, as it allows to limit combustion variability and to achieve higher combustion efficiencies compared to the other diesel injector configurations. However, the two- and four-spray diesel injectors lead to higher indicated efficiency levels. The observed difference in the ethanol ignition dynamics is evaluated and compared to conventional diesel combustion. The study broadens the knowledge on ethanol mixing-controlled combustion in heavy-duty engines at various operating conditions, providing the insight necessary for the optimization of the ethanol-diesel dual-injection system.

Analysis of the Low Pressure Circuit of a Gasoline Direct Injection System

MTZ worldwide ◽  
2016 ◽  
Vol 77 (2) ◽  
pp. 56-61
Author(s):  
Michael Spitznagel ◽  
Uwe Iben ◽  
Ronny Leonhardt ◽  
Michael Bargende
Keyword(s):  
Direct Injection ◽  
Low Pressure ◽  
Gasoline Direct Injection ◽  
Injection System

Progress on the Investigation of Coal-Water-Slurry Fuel Combustion in a Medium-Speed Diesel Engine: Part 3—Accumulator Injector Performance

1989 ◽  
Vol 111 (3) ◽  
pp. 516-520 ◽  
Author(s):  
B. D. Hsu ◽  
G. L. Leonard ◽  
R. N. Johnson
Keyword(s):  
Diesel Engine ◽  
Engine Performance ◽  
Diesel Oil ◽  
Fuel Combustion ◽  
Injection System ◽  
Water Slurry ◽  
Medium Speed ◽  
Engine Part ◽  
Coal Water Slurry

Coal-water-slurry (CWS) engine tests designed to evaluate a new accumulator-based injection system are described in this paper. The new injection system was found to improve CWS burnout considerably at both full and part engine loads. The peak cylinder firing pressure when operating with CWS was no higher than when operating with diesel oil. These data demonstrate the improved engine performance that can be achieved with the accumulator-based injection system.

Experimental Analysis on the Effects of Passive Prechambers on a Small 2-Stroke Low-Pressure Direct Injection (LPDI) Engine

2020 ◽  
Author(s):  
Lorenzo Bosi ◽  
Marco Ciampolini ◽  
Luca Romani ◽  
Francesco Balduzzi ◽  
Giovanni Ferrara
Keyword(s):  
Experimental Analysis ◽  
Direct Injection ◽  
Low Pressure

Minimum Backpressure Wastegate Control for a Boosted Gasoline Engine With Low Pressure External EGR

2016 ◽  
Author(s):  
Shima Nazari ◽  
Anna Stefanopoulou ◽  
Jason Martz
Keyword(s):  
Gasoline Engine ◽  
Direct Injection ◽  
Fuel Efficiency ◽  
Engine Performance ◽  
Low Pressure ◽  
Gasoline Direct Injection ◽  
Efficiency Gain ◽  
Engine Simulation ◽  
Trade Offs ◽  
Torque Response

Turbocharging and downsizing (TRBDS) a gasoline direct injection (GDI) engine can reduce fuel consumption but with increased drivability challenges compared to larger displacement engines. This tradeoff between efficiency and drivability is influenced by the throttle-wastegate control strategy. A more severe tradeoff between efficiency and drivability is shown with the introduction of Low-Pressure Exhaust Gas Recirculation (LP-EGR). This paper investigates and quantifies these trade-offs by designing and implementing in a one-dimensional (1D) engine simulation two prototypical throttle-wastegate strategies that bound the achievable engine performance with respect to efficiency and torque response. Specifically, a closed-wastegate (WGC) strategy for the fastest achievable response and a throttle-wastegate strategy that minimizes engine backp-pressure (MBWG) for the best fuel efficiency, are evaluated and compared based on closed loop response. The simulation of an aggressive tip-in (the driver’s request for torque increase) shows that the wastegate strategy can negotiate a 0.8% efficiency gain at the expense of 160 ms slower torque response both with and without LP-EGR. The LP-EGR strategy, however offers a substantial 5% efficiency improvement followed by an undesirable 1 second increase in torque time response, clarifying the opportunities and challenges associated with LP-EGR.

Performance Evaluation of Low Heat Rejection Engines

1994 ◽  
Vol 116 (4) ◽  
pp. 758-764 ◽  
Author(s):  
X. Sun ◽  
W. G. Wang ◽  
R. M. Bata ◽  
X. Gao
Keyword(s):  
Fuel Injection ◽  
Direct Injection ◽  
Combustion Process ◽  
Engine Performance ◽  
Injection System ◽  
Fuel Injection System ◽  
Heat Rejection ◽  
Single Cylinder ◽  
Single Cylinder Engine ◽  
Low Heat Rejection Engine

Improving the performance of the Chinese B135 six-cylinder direct injection turbocharged and turbocompounded Low Heat Rejection Engine (LHRE) was based on experimental and analytical studies. The studies were primarily applied on a B1135 single-cylinder LHR engine and a conventional water-cooled B1135 single cylinder engine. Performance of the B1135 LHRE was worse than that of the conventional B1135 due to a deterioration in the combustion process of the B1135 LHRE. The combustion process was improved and the fuel injection system was redesigned and applied to the B135 six-cylinder LHRE. The new design improved the performance of the LHRE and better fuel economy was realized by the thermal energy recovered from the exhaust gases by the turbocompounding system.

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