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 Effect of Varying Hot Surface Temperature on Ignition Delay Characteristics for Different Fuel Sprays

2019 ◽  
Vol 8 (4) ◽  
pp. 2906-2910
Keyword(s):  
Surface Temperature ◽  
Experimental Work ◽  
Ignition Delay ◽  
Fuel Injection ◽  
Solid Cone ◽  
Digital Oscilloscope ◽  
Fuel Sprays ◽  
Constant Volume Combustion Chamber ◽  
Hot Surface ◽  
Injection Pressures

An experimental work is performed in a constant volume combustion chamber to study the effect of varying hot surface temperature on ignition delay characteristics for different fuel sprays (Hollow cone spray and Solid cone spray). For ejecting the sprays pintle and single hole nozzles were used. In this experimental work hot surface temperature (HST) varied from 350°C to 550°C, air pressure inside the cylinder varied from 10 to 25 bar while fuel injection pressures varied from 10 to 20 MPa. Optical method is used for detecting the flame appearance while a digital Oscilloscope is used to measure ID of sprays by recording the gap between injection event and the event of appearance of flame. During the work it is found that ID is strong function of HST rather than other operating parameters. It is also found that on increasing HST, for both sprays ignition delay is decreasing at every injection pressures.

scholarly journals Simulation Study of Ignition Characteristics of Impinging Sprays in Constant Volume Chamber

2021 ◽  
Vol 23 (04) ◽  
pp. 70-81
Author(s):  
Sanaur Rehman ◽  
◽  
Shah Shahood Alam ◽  
Keyword(s):  
Surface Temperature ◽  
Simulation Study ◽  
Ignition Delay ◽  
Injection Pressure ◽  
Delay Period ◽  
Constant Volume ◽  
Operating Conditions ◽  
Air Pressure ◽  
Hot Surface ◽  
Ignition Delay Period

The present study involves the simulation of a constant volume, non-premixed, hot surface spray combustion of diesel fuel for a given set of injection pressure, compressed air pressure (cylinder air pressure) and hot surface temperature (hot plate temperature) and their effects on ignition delay period. Fuel injection pressure was varied from 100 bar – 300 bar in steps of 100 bar, cylinder air pressure in the range of 20 bar to 40 bar (in steps of 10 bar) and hot surface temperature from 623 K to 723 K (50 K steps). The problem was solved using 2D axisymmetric geometry. A structured mesh of about 1.24 lac nodal points was created and tested for grid independency. For solving flow behavior, a pressure solver was used with a turbulence model of k-ε with enhanced wall functions. While a volumetric eddy dissipation model was used to solve combustion phenomena. Ignition delay period was calculated with the help of static temperature versus time plot. It is found that keeping any two operating parameters constant, third operating parameter is inversely proportional to ignition delay period. The results of the present simulation study are in a fairly good agreement with the experimental studies at same operating conditions.

scholarly journals RESEARCH ON THE PROCESS OF BIOFUEL INJECTION / BIODEGALŲ IŠPURŠKIMO PROCESO TYRIMAS

2012 ◽  
Vol 4 (4) ◽  
pp. 381-385
Author(s):  
Birutė Skukauskaitė ◽  
Tomas Mickevičius
Keyword(s):  
Diesel Engine ◽  
Combustion Chamber ◽  
Diesel Fuel ◽  
Rapeseed Oil ◽  
Fuel Injection ◽  
Injection Pressure ◽  
Fuel Spray ◽  
Chamber Volume ◽  
Air Density ◽  
Engine Combustion

The purpose of this research was to examine penetration peculiarities of rapeseed oil injected into the combustion chamber of a diesel engine. For conducting tests, a stand imitating conditions (air density) for the engine combustion chamber was designed. The analysis of pictures obtained using a fast recording camera determined fuel injection into the chamber volume and calculated the velocity of spray head. It was established that fuel spray of injected rapeseed oil proceeds deeper into the combustion chamber than that of mineral diesel fuel. The parameters of fuel spray are mainly influenced by injection pressure rather than by the density of compressed gases. Santrauka Šio darbo tikslas buvo ištirti į dyzelinio variklio degimo kamerą įpurškiamos rapsų aliejaus čiurkšlės kitimo ypatumus, lyginant su mineraliniu dyzelinu. Tyrimams sukonstruotas stendas, kuriame buvo imituojamos sąlygos (oro tankis), esančios variklio degimo kameroje. Analizuojant spartaus filmavimo vaizdo kamera gautus vaizdus, buvo išmatuotas degalų čiurkšlės įsiskverbimo į degimo kamerą dydis, apskaičiuotas čiurkšlės fronto judėjimo greitis. Nustatyta, kad įpurškiamo rapsų aliejaus čiurkšlė į degimo kamerą įsiskverbia giliau, negu mineralinio dyzelino čiurkšlė. Įpurškiamų degalų čiurkšlės parametrams didesnės įtakos turi įpurškimo slėgis nei aplinkos dujų tankis.

scholarly journals Variation in Ignition Delay with Changing the Environment inside the Combustion Chamber for Different Sprays

2019 ◽  
Vol 8 (10) ◽  
pp. 3346-3353
Keyword(s):  
Combustion Chamber ◽  
Ignition Delay ◽  
Combustion Process ◽  
Injection Pressure ◽  
Hollow Cone ◽  
Solid Cone ◽  
Digital Oscilloscope ◽  
Temperature Ranges ◽  
Hollow Cone Spray ◽  
Injection Pressures

Ignition delay is very important parameter which influences the entire combustion process and emissions generated inside the engine. An experimental study was conducted to observe the variation in ignition delay with changing environment inside the combustion chamber for different sprays. Two types of nozzles namely pintle nozzle and single hole nozzle were used for creating hollow cone spray and solid cone spray respectively. This study was carried at different injection pressures (100 bar, 150 bar and 200 bar), different HST (350°C, 450°C and 550°C) and different air pressures (10 bar, 15 bar, 20 bar and 25 bar) for obtaining the value of ID. A digital Oscilloscope is used to record ID and optical method was used for detecting the flame. Results of the experiments show that air pressure, injection pressure and HST all are responsible for variation in ID but HST is more strongly affect the ID compared to other parameters. However at high value of HST and injection pressures variation in ID is less. Variations in the values of ID are more for Solid cone spray than Hollow Cone spray although ID is decreased for both sprays at almost all injection pressures. The dependency of types of spray is more prominent in lower temperature ranges compared to higher temperature ranges.

STUDIES ON EFFECTS OF COMBUSTION CHAMBER GEOMETRY AND INJECTION PRESSURE ON BIODIESEL COMBUSTION

2012 ◽  
Vol 36 (4) ◽  
pp. 429-438 ◽  
Author(s):  
Chandrashekharapua Ramachandraiah Rajashekhar ◽  
Tumkur Krishnamurthy Chandrashekar ◽  
Chebbiyyan Umashankar ◽  
Rajagopal Harish Kumar
Keyword(s):  
Diesel Engine ◽  
Combustion Chamber ◽  
Experimental Studies ◽  
Injection Pressure ◽  
High Viscosity ◽  
Combustible Mixture ◽  
Emission Characteristics ◽  
Performance And Emission ◽  
Engine Combustion ◽  
Performance And Emissions

Combustion of biodiesels has inherent problems due to their high viscosity and low volatility. This paper relates the modification of engine combustion chamber design, for inducing turbulence to improve the combustibility of combustible mixture. A survey of literature shows that experimental studies have not been done on a tri-chambered piston for evaluating influence on the performance and emission characteristics using diesel blends as well. The objective of this work is to study the effect of combustion chamber geometry and injection pressure on performance and emissions of a biodiesel (Jatropha) fuelled multi-chambered piston diesel engine. The performance and emission characteristics were studied and it has been noticed that for the engine under consideration 200 bar injection pressure gives optimum performance.

scholarly journals Effect of Cylinder Air Pressure and Hot Surface Temperature on Ignition Delay of Diesel Spray in a Constant Volume Combustion Chamber

Energies ◽  
2019 ◽  
Vol 12 (13) ◽  
pp. 2565
Author(s):  
Mohammad Salman ◽  
Sung Chul Kim
Keyword(s):  
Combustion Chamber ◽  
Diesel Engines ◽  
Ignition Delay ◽  
Strong Dependence ◽  
Injection Pressure ◽  
Constant Volume ◽  
Fuel Additive ◽  
Constant Volume Combustion ◽  
Constant Volume Combustion Chamber ◽  
Hot Surface

Present-day direct injection (DI) diesel engines with a high power density of displacement are not just promoting an expansion in the utilization of high-temperature resistant alloys in pistons yet, in addition, the expanded cylinder air pressures. When the temperature of the diesel engines piston exceeds a certain limit, it assumes a critical role at the start of sprays. The target of the present investigation was to look at the effects of cylinder air pressures (CAP) (10–25 bar) and high hot surface temperatures (HST) (350–450 °C). The ignition delay (ID) of pure diesel and that of diesel with Iftex clean system D (a cetane enhancer) are investigated experimentally. The experiments are performed by using a constant volume combustion chamber (CVCC) with a single hole pintle-type nozzle mounted on its head. A strong dependence of ID on the CAPs and HSTs was observed. A CAP of 25 bar is much inferior to the precombustion pressure of DI diesel engines; however, it is the case that combustion typical features are the same in spite of an inferior CAP, HST, and injection pressure. The ID tends to decrease to very small values with an increase in either of the two parameters. At a CAP of 25 bar, the measured ID of diesel with fuel additive is 45.8% lower than the pure diesel. Further, the ID of diesel with fuel additive at a 300 bar injection pressure and 25 bar CAP decreases at a rate of close to 0.2 ms/bar.

Analysis and Research of the Combustion Process of YN4100QB Diesel Engine

2013 ◽  
Vol 744 ◽  
pp. 35-39
Author(s):  
Lei Ming Shi ◽  
Guang Hui Jia ◽  
Zhi Fei Zhang ◽  
Zhong Ming Xu
Keyword(s):  
Diesel Engine ◽  
Internal Combustion Engine ◽  
Combustion Chamber ◽  
Optimization Design ◽  
Combustion Engine ◽  
Geometric Model ◽  
Combustion Process ◽  
Internal Combustion ◽  
Engine Combustion ◽  
Exhaust Noise

In order to obtain the foundation to the research on the Diesel Engine YN4100QB combustion process, exhaust, the optimal design of combustion chamber and the useful information for the design of exhaust muffler, the geometric model and mesh model of a type internal combustion engine are constructed by using FIRE software to analyze the working process of internal combustion engine. Exhaust noise is the main component of automobile noise in the study of controlling vehicle noise. It is primary to design a type of muffler which is good for agricultural automobile engine matching and noise reduction effect. The present car mufflers are all development means. So it is bound to cause the long cycle of product development and waste of resources. Even sometimes not only can it not reach the purpose of reducing the noise but also it leads to reduce the engine dynamic. The strength of the exhaust noise is closely related to engine combustion temperature and pressure. The calculation and initial parameters are applied to the software based on the combustion model and theory. According to the specific operation process of internal combustion engine. Five kinds of common operation condition was compiled. It is obtained for the detailed distribution parameters of combusted gas temperature pressure . It is also got for flow velocity of the fields in cylinder and given for the relation of the parameters and crankshaft angle for the further research. At the same time NOx emissions situation are got. The numerical results show that not only does it provide the 3D distribution data in different crank shaft angle inside the cylinder in the simulation of combustion process, but also it provides a basis for the engine combustion ,emission research, the optimization design of the combustion chamber and the useful information for the designs of muffler.

scholarly journals Influence of Chemical Composite Additive on Combustion and Emission Characteristics of a Diesel Engine using Waste Plastic Oil as Fuel and Modified Piston Bowl

2018 ◽  
Vol 34 (6) ◽  
pp. 2806-2813
Author(s):  
Pappula Bridjesh ◽  
Pitchaipillai Periyasamy ◽  
Narayanan Kannaiyan Geetha
Keyword(s):  
Experimental Investigation ◽  
Diesel Engine ◽  
Combustion Chamber ◽  
Emission Characteristics ◽  
Soy Lecithin ◽  
Physiochemical Properties ◽  
Waste Plastic ◽  
Piston Bowl ◽  
Waste Plastic Oil ◽  
Engine Combustion

This experimental investigation is an endeavour to substitute diesel with WPO as fuel on a diesel engine. Enhancing the physiochemical properties of WPO or with hardware modifications on the engine, the performance of engine could not be improved up to the mark. The physiochemical properties of WPO are enhanced by the use of composite additive, which is a mixture of soy lecithin and 2-ethylhexyl nitrate and to improve the in-cylinder air motion; subsequently to increase the swirl and turbulence, standard hemispherical combustion chamber is modified to toroidal spherical grooves combustion chamber. The results of combined effect of modifying the combustion chamber and addition of composite additive suggest that improvements in engine-out emissions can be obtained from current diesel engines by enhancing physiochemical properties of fuel and matching geometry of combustion chamber. Engine combustion and emission characteristics under various loads for various fuels under test are as well studied.

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