A sensor based assessment of ignition delay for pure diesel and biodiesel blends in an isochoric combustion box

2020 ◽  
pp. 241-249
Author(s):  
Md Nazeem Khan ◽  
Inayat Hussain ◽  
M. Zunaid ◽  
Amit Pal
Keyword(s):  
Diesel Engine ◽  
Ignition Delay ◽  
Pressure Gauge ◽  
Fuel Injector ◽  
Fuel Blend ◽  
Efficient Operation ◽  
Time Period ◽  
Photo Sensor ◽  
Hot Surface ◽  
Surface Plate

The key to efficient operation of a diesel engine is the smooth combustion of the fuel and controlled detonation. In diesel engine detonation depends on ignition delay (ID) period. An isochoric cylindrical combustion box (CCB) is fabricated for the assessment of ID tendency for simple diesel and vegetable oils-diesel fuel blend (VODFB). The combustion box consist of air heating coils, hot surface plate, fuel injector, pressure gauge, temperature indictor, temperature controller and photo sensor. A two stage compressor with intercooler is used for charging the air in the combustion box. The ignition lag was measured for injection pressures (IP) (100-bar, 200-bar and 300-bar), hot surface temperatures (400°C and 450°C), cylinder pressures (10, 15, 20 and 25-bar) for simple diesel and VODFB by using photo sensor and scope-meter. The results show that ID was decreased with increase in IP, at a specific cylinder pressure and HST for both simple diesel and VODFB. At high IP (300-bar), ID is lower for the blended fuel because at high IP, the fuel covers more physical land and more fuel is vaporized within a given time period and hence ID time decrease.

scholarly journals Improvement in Ignition Delay Characteristics of Diesel Engine Combustion by Varying Combustion Chamber Air Pressure

2020 ◽  
Vol 9 (2) ◽  
pp. 1866-1870
Keyword(s):  
Diesel Engine ◽  
Surface Temperature ◽  
Combustion Chamber ◽  
Experimental Work ◽  
Ignition Delay ◽  
Injection Pressure ◽  
Air Pressure ◽  
Solid Cone ◽  
Engine Combustion ◽  
Hot Surface

Complete and clean combustion is always desirable for better performance of engine and less emissions. An experimental work is carried in constant volume combustion chamber for getting conditions like diesel engine combustion to study the ignition delay characteristics of diesel engine combustion by varying combustion chamber air pressure. In this experimental work, air pressure of combustion chamber varied from 10 to 25 bar, hot surface temperature inside the combustion chamber varied from 350°C to 550°C and fuel injection pressures varied from 100 to 200 bar for hollow cone spray and solid cone spray . For this work a set-up is made in which the flame detection is done by digital storage oscilloscope using an optical method. The findings of the work suggests that combustion chamber air pressure and injection pressure are significantly varies the values of ignition delay at a particular hot surface temperature. It is also find that on increasing the values of combustion chamber air pressure and injection pressure, ignition delay values are decreases although the variation in ignition delay is less at higher injection pressure and combustion chamber air pressure.

scholarly journals Exploring the Synergistic Potential of Fuzzy Methodology Based Multi-Objective Optimisation in the Performance, Emission and Stability Trade-Off Study of an Existing Conventional CRDI Diesel Engine Powered With Schleichera Oleosa Biodiesel/Diesel Blends

2021 ◽  
Author(s):  
Ramachander jatoth ◽  
Santhosh Kumar Gugulothu
Keyword(s):  
Diesel Engine ◽  
Direct Injection ◽  
Optimization Technique ◽  
Common Rail ◽  
Fuel Injector ◽  
Fuel Blend ◽  
Biodiesel Blends ◽  
Direct Injection Diesel Engine ◽  
Multi Objective ◽  
Schleichera Oleosa

Abstract The common rail direct injection diesel engine is an advanced combustion method to use alternative fuel with higher fuel economy and, reduce NOx and soot emissions. The present paper aims to investigate the influence of Schleichera oleosa oil (Kusum oil) on CRDI engine performance. This paper deals with the study on the influence of the Schleichera oleosa oil (Kusum oil) when added to diesel blend (B25, B50, B75, B100) on the emission, combustion and performance characteristics of a four stroke, single cylinder, common rail direct injection diesel engine working at a fixed speed and varying operating scenarios. The mixture of kusum oil blend and air is ignited by diesel through fuel injector into the combustion chamber at the end of compression stroke. It is noticed from the experimental results that, with an increase of kusum oil in the blends, ignition delay (ID) increases and start of combustion (SOC) is retarded. It is noticed that B100 shows the highest ID and low in-cylinder pressure; however, B50 shows the lowest ID compared to higher fractions of biodiesel blends. An increase in biodiesel proportion reduces NOx and smoke opacity but, HC and CO emissions increase compared to pure diesel mode engine. B25 shows the highest brake thermal efficiency (12%) compared to remaining biodiesel blends and baseline diesel engine. For finding optimum blend for lower BSFC, NOx, UHC and higher BTE Taguchi method is considered. Then Fuzzy rule is considered for two inputs parameters (load and fuel blend) and single output variable (MPCI). By considering multi-objective optimization technique, it is found that B25 blend has optimal MPCI value (0.68) which makes it best blend for enhancing the performance and lowering the emissions.

Numerical Analysis of Aluminium Oxide Nano Particles with Biodiesel in a Diesel Engine Fitted with Hemispherical Groove in the Piston

2021 ◽  
pp. 3691-3700
Keyword(s):  
Diesel Engine ◽  
Numerical Analysis ◽  
Kinetic Energy ◽  
Turbulent Kinetic Energy ◽  
Nano Particles ◽  
Fuel Injector ◽  
Biodiesel Blends ◽  
Closed Position ◽  
Combustion Features ◽  
Engine Valves

For proper combustion, bowl in the piston geometry plays a crutial role when the engine valves are in closed position. In the present work, the combustion geometry is of hemi-spherical groove in the upper region of the piston.simulations weres conducted for different blends( b20+al40, b20+al80) to analyze the combustion features in a four stroke diesel engine using ansys r18.1 software considering above geometry of the piston. . Pertaining to greater amount of density, viscosity of biodiesel blends, variations for b20+al80 render more performance than the biodiesel. Turbulent kinetic energy of both the fuels follow similar trend due to proper mixing of air with the fuel from fuel injector.

Characteristics of injection of diesel fuel, rapeseed oil and their mixtures in diesel engines of various types

2021 ◽  
pp. 167-178
Author(s):  
Keyword(s):  
Diesel Engine ◽  
Diesel Fuel ◽  
Diesel Engines ◽  
Rapeseed Oil ◽  
High Speed ◽  
Fuel Injection ◽  
Experimental Studies ◽  
Fuel Injector ◽  
High Speed Diesel ◽  
Engine Type

The necessity of adapting diesel engines to work on vegetable oils is justified. The possibility of using rapeseed oil and its mixtures with petroleum diesel fuel as motor fuels is considered. Experimental studies of fuel injection of small high-speed diesel engine type MD-6 (1 Ch 8,0/7,5)when using diesel oil and rapeseed oil and computational studies of auto-tractor diesel engine type D-245.12 (1 ChN 11/12,5), working on blends of petroleum diesel fuel and rapeseed oil. When switching autotractor diesel engine from diesel fuel to rapeseed oil in the full-fuel mode, the mass cycle fuel supply increased by 12 %, and in the small-size high-speed diesel engine – by about 27 %. From the point of view of the flow of the working process of these diesel engines, changes in other parameters of the fuel injection process are less significant. Keywords diesel engine; petroleum diesel fuel; vegetable oil; rapeseed oil; high pressure fuel pump; fuel injector; sprayer

scholarly journals Modeling a fuel injector for a two-stroke diesel engine

2017 ◽  
Vol 170 (3) ◽  
pp. 147-153
Author(s):  
Rafał SOCHACZEWSKI ◽  
Zbigniew CZYŻ ◽  
Ksenia SIADKOWSKA
Keyword(s):  
Diesel Engine ◽  
Combustion Chamber ◽  
Fuel Injection ◽  
Maximum Load ◽  
Fuel Injector ◽  
Dimensional Model ◽  
Flow Area ◽  
Fuel Mass ◽  
One Dimensional ◽  
Injector Nozzle

This paper discusses the modeling of a fuel injector to be applied in a two-stroke diesel engine. A one-dimensional model of a diesel injector was modeled in the AVL Hydsim. The research assumption is that the combustion chamber will be supplied with one or two spray injectors with a defined number of nozzle holes. The diameter of the nozzle holes was calculated for the defined options to provide a correct fuel amount for idling and the maximum load. There was examined the fuel mass per injection and efficient flow area. The studies enabled us to optimize the injector nozzle, given the option of fuel injection into the combustion chamber to be followed.

scholarly journals An investigation of the fuel injector dedicated to the aircraft opposed-piston two-stroke diesel engine

2019 ◽  
Vol 177 (2) ◽  
pp. 151-155
Author(s):  
Ksenia SIADKOWSKA ◽  
Mirosław WENDEKER ◽  
Łukasz GRABOWSKI
Keyword(s):  
Diesel Engine ◽  
Combustion Process ◽  
Mie Scattering ◽  
Operating Conditions ◽  
Fuel Spray ◽  
Chamber Pressure ◽  
Fuel Injector ◽  
Measuring Point ◽  
Fuel Delivery ◽  
The Moment

The paper presents the research results of the injector construction with the modified injection nozzle. The injector is designed for a prototype opposed-piston aircraft diesel engine. The measurements were based on the Mie scattering technique. The conditions of the experiment corresponded to maximum loads similar to those occurring at the start. The measuring point was selected in line with the analysis of engine operating conditions: combustion chamber pressure at the moment of fuel delivery (6 MPa) and fuel pressure in the injection rail (140 MPa). The analysis focused on the average spray range and distribution, taking into account the differences between holes in the nozzle. As a result of the conducted research, the fuel spray range was defined with the determined parameters of injection. The fuel spray ranges inside the constant volume chamber at specific injection pressures and in the chamber were examined, and the obtained results were used to verify and optimize the combustion process in the designed opposed-piston two-stroke engine.

scholarly journals Effect of Partially Premixed Fuel on Performance and Emission Characteristics of Compression Ignition (CI) Engine

2019 ◽  
Vol 8 (4S2) ◽  
pp. 163-166
Keyword(s):  
Diesel Engine ◽  
New Technology ◽  
Control Unit ◽  
Injection Timing ◽  
Emission Characteristics ◽  
Compression Ignition ◽  
Fuel Injector ◽  
Si Engine ◽  
Performance And Emission ◽  
Partially Premixed

In this world, the population is increased and the number of vehicles increased. Not only population the pollution is increased lot by vehicles in the world harmful pollutant is realized from the vehicles like CO, HC, NOx and smoke particulates. It is inevitable to find some new technology, which increases the better performance and emission characteristics. Partially premixed compression ignition (PCCI) is the best technology for the reducing of harmful pollution in the vehicle, which uses the diesel as fuel it, gives the advantages of both CI and SI engine. This paper investigates the performance and emission characteristics of partially premixed diesel engine. Diesel engine has two injectors of port fuel injector (PFI) and direct injector (DI) to inject the fuel in different timing and electrical control unit (ECU) passes the power to PFI; it can control the injection timing and increases the fuel content from the fuel pump. The main aim in this paper is studied is effect of partially premixed ratio, performance of engine and emission characteristics of diesel engine

scholarly journals MODELING OF IGNITION DELAY PERIOD IN DIESEL ENGINE

2019 ◽  
Vol 0 (1) ◽  
pp. 34-38
Author(s):  
А. П. Марченко ◽  
І. В. Парсаданов ◽  
А. В. Савченко
Keyword(s):  
Diesel Engine ◽  
Ignition Delay ◽  
Delay Period ◽  
Ignition Delay Period
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