Experimental investigation on the effect of injector hole number on engine performance and particle number emissions in a light-duty diesel engine

2020 ◽  
pp. 146808742093460
Author(s):  
Khawar Mohiuddin ◽  
Heesun Kwon ◽  
Minhoo Choi ◽  
Sungwook Park
Keyword(s):  
Diesel Engine ◽  
Heat Release ◽  
Heat Release Rate ◽  
Release Rate ◽  
Particle Number ◽  
High Loading ◽  
Cylinder Pressure ◽  
Light Duty ◽  
Combustion Duration ◽  
Hole Number

Particle number emissions need to be monitored and controlled in order to comply with the latest emission legislations for gasoline and diesel engines. This research focuses on performance and emission analysis of a light-duty diesel engine with various injector hole numbers. A 500cc single-cylinder diesel engine was used for this purpose, and injectors with hole numbers varying from 7 to 10 were analyzed. Different operating conditions were selected to test the engine at all types of loading conditions. Start of injection and exhaust gas recirculation swings were carried out at all the test cases to see the variation of particle number and other emissions. Increasing injector hole number from 7 to 9, in-cylinder pressure heat release rate and combustion duration increased while ignition delay was shortened. Soot-NOx and ISFC-NOx trade-offs also improved with decreasing hole diameter for these hole numbers. Particle number emissions reduced significantly with increasing hole number. However, the 10-hole injector exhibited a different behavior than the other injectors. For low loading case, cylinder pressure and heat release rate were higher than those of the 9-hole injector but for medium and high loading cases, in-cylinder pressure, heat release rate, and combustion duration of the 10-hole injector were found to be lesser than the 9-hole injector. For medium and high loading cases, particle number emissions from the 10-hole nozzle also increased as compared to the 9-hole injector. Optical engine investigation revealed a higher flame-flame interference in case of the 10-hole injector which resulted in degraded combustion performance and higher particle number emissions.

Combustion and Emission Characteristics of Dual Fuel Engine for Different Parameters

2021 ◽  
Vol 13 (4) ◽  
Author(s):  
Jianjun Zhu ◽  
Peng Li ◽  
Yufeng Xie ◽  
Xin Geng
Keyword(s):  
Diesel Engine ◽  
Heat Release ◽  
Heat Release Rate ◽  
Compression Ratio ◽  
Release Rate ◽  
Emission Characteristics ◽  
Soot Emission ◽  
Cylinder Pressure ◽  
Fuel Delivery ◽  
Soot Emissions

The effects of compression ratio and fuel delivery advance angle on the combustion and emission characteristics of premixed methanol charge induced ignition by Fischer Tropsch diesel engine were investigated using a CY25TQ diesel engine. In the process of reducing the compression ratio from 16.9 to 15.4, the starting point of combustion is fluctuating, the peak of in-cylinder pressure and the maximum pressure increase rate decrease by 44.5% and 37.7% respectively. The peak instantaneous heat release rate increases by 54.4%. HC and CO emissions are on a rising trend. NOx and soot emissions were greatly decreased. The soot emission has the biggest drop of 50%. Reducing the fuel delivery advance angle will make the peak of in-cylinder pressure and the peak of pressure rise rate increase while the peak of heat release rate decreases. The soot emission is negatively correlated with the fuel delivery advance angle. When the fuel delivery advance angle is 16° CA, the soot emissions increased the most by 130%.

Combustion Characteristics of Single Cylinder Diesel Engine Fueled with Blends of Thumba Biodiesel as an Alternative Fuel

2019 ◽  
Vol 969 ◽  
pp. 451-460
Author(s):  
Manpreet Singh ◽  
Mohd Yunus Sheikh ◽  
Dharmendra Singh ◽  
P. Nageswara Rao
Keyword(s):  
Diesel Engine ◽  
Heat Release ◽  
Heat Release Rate ◽  
Diesel Fuel ◽  
Release Rate ◽  
Mass Fraction ◽  
Pressure Rise ◽  
Cylinder Pressure ◽  
Gas Temperature ◽  
Edible Vegetable Oil

The rapid rise in energy requirement and problem regarding atmosphere pollutions, renewable biofuels are the better alternative choice for the internal combustion engine to partially or totally replace the pollutant petroleum fuel. In the present work, thumba (Citrullus colocynthis) non-edible vegetable oil is used for the production of biodiesel and examine its possibility as diesel engine fuel. Transesterification process is used to produce biodiesel from thumba non-edible vegetable oil. Thumba biodiesel (TBD) is used to prepare five different volume concentration (blends) with neat diesel (D100), such as TBD5, TBD15, TBD25, TBD35 and TBD45 to run a single cylinder diesel engine. The diesel engine's combustion parameter such as in-cylinder pressure, rate of pressure rise, net heat release rate, cumulative heat release, mean gas temperature, and mass fraction burnt analyzed through graphs and compared all thumba biodiesel blends result with neat diesel fuel. The mass fraction burnt start earlier for thumba biodiesel blends compared to diesel fuel because of less ignition delay while peak in-cylinder pressure, maximum rate of pressure rise, maximum net heat release rate, maximum cumulative heat release, and maximum mean gas temperature has found decreased results up to 1.93%, 5.53%, 4.11%, 4.65%, and 1.73% respectively for thumba biodiesel.

scholarly journals Coating of diesel engine with new generation ceramic material to improve combustion and performance

2021 ◽  
Vol 25 (Spec. issue 1) ◽  
pp. 101-110
Author(s):  
Erdinc Vural ◽  
Serkan Ozel ◽  
Salih Ozer
Keyword(s):  
Diesel Engine ◽  
Heat Release ◽  
Heat Release Rate ◽  
Release Rate ◽  
Bond Coat ◽  
Combustion Engine ◽  
Engine Performance ◽  
Cylinder Pressure ◽  
Engine Torque ◽  
Engine Power

In this study, piston and valve surfaces of a Diesel engine to improve exhaust emis?sion and engine performance values, NiCr with bond coat and without bond coat with Cr2O3, Al2O3+13%TiO2, Cr2O3+25%Al2O3 coatings were coated using plasma spray method. By examining the micro-structures of the coating materials, it was observed that a good coating bond is formed. In this study, unlike other coating applications, two different and proportions of specific ceramic powders were coated on the combustion chamber elements, mounted on a Diesel engine, and their effects on engine performance and emissions were tested on the engine dynamometer. For this purpose, the internal combustion engine was operated at 1400, 1700, 2000, 2300, 2600, 2900, and 3200 rpm engine speeds and engine power, engine torque, in-cylinder pressure changes and heat release rate values were recorded. In this study, the that results were obtained by comparing thermal barrier coated engine with standard engine. An increase of 14.92% in maximum engine power, 12.35% in engine torque, 13% in-cylinder pressure, heat release rate by 4.5%, and brake thermal efficiency by 10.17% was detected, while brake specific fuel consumption decreased by 14.96%.

scholarly journals Effect of Various Supercharger Boost Pressure to in-Cylinder Pressure and Heat Release Rate Characteristics of Direct Injection Diesel Engine at Various Engine Rotation

2019 ◽  
Vol 130 ◽  
pp. 01036
Author(s):  
Willyanto Anggono ◽  
Wataru Ikoma ◽  
Haoyu Chen ◽  
Zhiyuan Liu ◽  
Mitsuhisa Ichiyanagi ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Heat Release ◽  
Heat Release Rate ◽  
Release Rate ◽  
Power Efficiency ◽  
Direct Injection ◽  
Boost Pressure ◽  
Cylinder Pressure ◽  
Stroke Length ◽  
Direct Injection Diesel Engine

The diesel engines are superior in terms of power efficiency and fuel economy compared to gasoline engines. In order to optimize the performance of direct injection diesel engine, the effect of various intake pressure (boost pressure) from supercharging direct injection diesel engine was studied at various engine rotation. A single cylinder direct injection diesel engine was used in this experiment. The bore diameter of the engine used was set to 85 mm, the stroke length was set to 96.9 mm, and the compression ratio was set to 16.3. The variation of engine rotation started from 800 rpm to 2 000 rpm with 400 rpm increment. The variation of boost pressure is bounded from 0 kPa boost pressure (naturally aspirated) to the maximum of 60 kPa boost pressure with 20 kPa boost pressure increment. The performance of the engine is evaluated in terms of in-cylinder pressure and heat release rate as the most important performance characteristics of the diesel engine. The in-cylinder pressure and heat release rate of direct injection diesel engine are increased with the elevation of boost pressure at various engine rotation. The raise of engine rotation resulted in the decrease of maximum in-cylinder pressure and heat release rate.

Prediction of the effect of injection parameters on NOx emission and burning quality in the direct injection diesel engine using a modified multizone model

1998 ◽  
Vol 212 (5) ◽  
pp. 427-436 ◽  
Author(s):  
H Salem ◽  
S. H. El-Bahnasy ◽  
M Elbaz
Keyword(s):  
Diesel Engine ◽  
Heat Release ◽  
Heat Release Rate ◽  
Release Rate ◽  
Combustion Process ◽  
Injection Pressure ◽  
Cylinder Pressure ◽  
Injection Parameters ◽  
Multizone Model ◽  
Engine Power

Combustion process in a quiescent chamber diesel engine is modelled using a multizone model. This model divides the cylinder charge into two zones, namely the unburnt zone (surrounding air) and the burnt zone (fuel spray with entrained air). The burnt zone is subdivided into 16 concentric sprays, instead of only eight sprays as in previous work, each one with its own temperature and composition. Liquid fuel, fuel vapour, air and products of combustion are assumed to be present in each zone. Real gas relations are used to calculate the properties of the mixture while products of combustion are assumed to be in chemical equilibrium at local temperature. The extended Zeldovich mechanism is used to predict the NO x formation. The cylinder pressure, temperature, heat release rate, NO x rate and concentration are calculated. For different injection pressures, injection advance angles and different fuel orifice hole diameters, the results show that the model can predict the measured cylinder pressure with high accuracy but it predicts the measured heat release rate and NO x emission rate with moderate accuracy. In addition, the effect of injection parameters on the NO x emission and engine power is predicted and it has been shown that NO x emission can be reduced without noticeable loss of engine power. This can be done by appropriate choice of injection pressure, injection advance angle and fuel nozzle hole diameters.

scholarly journals Combustion and Performance Study of Low-Displacement Compression Ignition Engines Operating with Diesel–Biodiesel Blends

2020 ◽  
Vol 10 (3) ◽  
pp. 907 ◽  
Author(s):  
Guillermo Valencia Ochoa ◽  
Carlos Acevedo Peñaloza ◽  
Jorge Duarte Forero
Keyword(s):  
Diesel Engine ◽  
Heat Release ◽  
Palm Oil ◽  
Heat Release Rate ◽  
Release Rate ◽  
Sunflower Oil ◽  
Combustion Process ◽  
Cylinder Pressure ◽  
Emission Analysis ◽  
Biodiesel Blends

This study investigated the influence of different biodiesel blends produced from residual sunflower oil and palm oil from agroindustry liquid waste on the characteristics of the combustion process, performance, and emissions in a single-cylinder diesel engine. For the analysis of the combustion process, a diagnostic model was developed based on the cylinder pressure signal, which allows the calculation of the heat release rate, the accumulated heat rate, and the temperature in the combustion chamber. This is to assess the influence of these parameters on engine emissions. The experiments on the diesel engine were carried out using five types of fuel: conventional diesel, two biodiesel blends of residual palm oil (PB5 and PB10), and two biodiesel blends formed with palm oil and sunflower oil residues (PB5SB5 and PB10SB5). The engine was running in four different modes, which covered its entire operating area. Experimental results show that the in-cylinder pressure curves decrease as the percentage of biodiesel in the fuel increases. Similarly, the results showed a decrease in the heat release rate for biodiesel blends. The diagrams of the accumulated heat release curves were larger for fuels with higher biodiesel content. This effect is reflected in the thermal efficiency of biodiesel blends since the maximum thermal efficiencies were 29.4%, 30%, 30.6%, 31.2%, and 31.8% for PB10SB5, PB5SB5, PB10, PB5, and diesel, respectively. The emission analysis showed that the blends of biodiesel PB5SB5 and PB10SB allowed a greater reduction in the emissions of CO, CO2, HC, and opacity of smoke in all the modes of operation tested, in comparison with the blends of biodiesel PB5 and PB10. However, NOx emissions increased. In general, biodiesel with the percentage of residual sunflower oil does not cause a significant change in the combustion process and engine performance, when compared to biodiesel that includes only residual palm oil.

Effects of λ on the Combustion Characteristics of HCCI Engine Fueled with N-Butanol

2015 ◽  
Vol 1092-1093 ◽  
pp. 508-511
Author(s):  
Jia Wang Zhou ◽  
Chun Hua Zhang ◽  
Gang Li ◽  
Ye Chun Shen
Keyword(s):  
Heat Release ◽  
Heat Release Rate ◽  
Release Rate ◽  
Combustion Engine ◽  
Pressure Rise ◽  
Combustion Characteristics ◽  
Cylinder Pressure ◽  
Maximum Heat ◽  
Hcci Engine ◽  
Combustion Duration

The combustion characteristics of an HCCI engine fueled with n-butanol were investigated on a modified two-cylinder, four stoke diesel engine. The experiments were conducted on the HCCI engine with λ of 2.0, 2.5 and 3.0, and the intake air temperature and engine speed were kept at 140 °C and 1000rpm, respectively. Effects of λ on combustion characteristics including in-cylinder pressure rise rate, heat release rate, CA05 and combustion duration of HCCI combustion engine are discussed in details based on the recorded in-cylinder pressure. The results indicate that in-cylinder pressure and the rate of pressure rise both decrease with the increase of λ, the maximum heat release rate also decreases with the increase of λ but occurs at late crank angles. In addition, as λ increases, the combustion phasing retards and combustion duration becomes longer.

Research on the Heat Release Rate Characteristics of Diesel Engine Coolant System Based on GT-POWER

2012 ◽  
Vol 562-564 ◽  
pp. 1036-1039
Author(s):  
Xing Hua Liu ◽  
Zhi Qiang Fan ◽  
Hong Liang ◽  
Yang Li ◽  
Liang Ping Guo
Keyword(s):  
Heat Release ◽  
Heat Release Rate ◽  
Release Rate ◽  
High Load ◽  
Experimental Result ◽  
Cylinder Pressure ◽  
Low Load ◽  
Power Code ◽  
Engine Coolant ◽  
Coolant System

By means of GT-POWER code, the simulation model of diesel has been established whose cylinder pressure was calibrated. The simulation and experimental result accorded mostly which validated the correctness of this model. The MAP of the heat release rate was obtained basically. The results showed that at low load, the higher the speed is, the larger the heat release rate is; on the condition of the high load, with the increase of the speed, the heat release rate decreases firstly and increases afterwards. This study could offer a guidance to the designment of the coolant system.

Sign in / Sign up

Export Citation Format

Share Document