scholarly journals Response Surface Modelling of Diesel Engine Emissions under Variable Stroke Length and Constant Compression Ratio

2018 ◽  
Vol 12 (10) ◽  
pp. 36
Author(s):  
Jehad A. A. Yamin
Keyword(s):  
Diesel Engine ◽  
Compression Ratio ◽  
Direct Injection ◽  
Statistical Technique ◽  
Stroke Length ◽  
Piston Bowl ◽  
Wide Range ◽  
Injection Water ◽  
Response Surface Modelling ◽  
Relative Change

A theoretical investigation using RSM statistical technique on the relative change of emissions of a four-stroke, direct injection, water-cooled, 4-stroke, diesel engine with variable stroke length was carried out.  The performance parameters were studied over wide range of speeds (1000 - 3000 RPM at an increment of 500 RPM) and stroke lengths (130 mm to 210mm at an increment of 20mm). The compression ratio was kept constant by adjusting the piston bowl volume. It was found within the range of stroke length studied, that larger stroke lengths are favorable for lower NOx and specific CO2 emissions. This is due to the lower availability of Oxygen. As for specific PM and BSN, the shorter the stroke length the lower the levels. This is attributed to improved engine charging efficiency, hence, better availability of oxygen.

scholarly journals Engine Manifold Wave Action under Variable Stroke Length

2017 ◽  
Vol 11 (8) ◽  
pp. 79
Author(s):  
Jehad Ahmad Yamin
Keyword(s):  
Diesel Engine ◽  
Pressure Wave ◽  
Direct Injection ◽  
Engine Performance ◽  
Wave Action ◽  
Pressure Waves ◽  
Valve Timing ◽  
Stroke Length ◽  
Piston Bowl ◽  
Wide Range

A theoretical investigation on the pressure wave action of the manifolds of a four-stroke, direct injection (hereinafter referred to as DI), water-cooled, 4-stroke, diesel engine with variable stroke length was carried out.  The study was conducted over wide range of speeds (1000 - 3000 RPM at an increment of 500 RPM) and stroke lengths (130 mm to 210 mm at an increment of 20mm). The compression ratio was kept constant by adjusting the piston bowl volume. The study showed that shorter stroke lengths created favorable pressure waves in both inlet and exhaust manifolds at lower speeds, which resulted in improved engine volumetric and thermal efficiencies. At higher speeds, the larger strokes were favorable, however, due to less time available for the suction and exhaust strokes to be executed, the efficiencies were low. Advancing valve timing was one factor that improved the engine performance with larger stroke lengths.

scholarly journals Influence of combustion chamber geometry on performance and emissions of diesel engine Vikyno RV125-2

2015 ◽  
Vol 18 (1) ◽  
pp. 102-111
Author(s):  
Khai Le Duy Nguyen ◽  
Hung Dac Khanh Nguyen
Keyword(s):  
Diesel Engine ◽  
Combustion Chamber ◽  
Compression Ratio ◽  
Direct Injection ◽  
Soot Concentration ◽  
Research Results ◽  
Direct Injection Diesel Engine ◽  
Piston Bowl ◽  
Performance And Emissions ◽  
Engine Power

This paper presents a research on the influence of combustion chamber geometry on performance and emissions of direct injection diesel engine VIKYNO RV125-2 using threedimensional CFD code KIVA-3V. In this study, the piston bowl depth (pip-height), bottom bowl diameter and bowl diameter are changed while the engine compression ratio is still kept. Research results indicate that increased bowl diameter works best. Specifically, when the bowl diameter changes from 3.98cm to 4.7cm, the engine power is increased 22.6%, while the concentration of NOx is reduced 0.85%. However soot concentration will increase 45.83%.

scholarly journals Modification of a Direct Injection Diesel Engine in Improving the Ignitability and Emissions of Diesel–Ethanol–Palm Oil Methyl Ester Blends

Energies ◽  
2019 ◽  
Vol 12 (14) ◽  
pp. 2644 ◽  
Author(s):  
Norhidayah Mat Taib ◽  
Mohd Radzi Abu Mansor ◽  
Wan Mohd Faizal Wan Mahmood
Keyword(s):  
Diesel Engine ◽  
Methyl Ester ◽  
Ambient Temperature ◽  
Palm Oil ◽  
Compression Ratio ◽  
Direct Injection ◽  
Cetane Number ◽  
Engine Performance ◽  
Injection Timing ◽  
Injection Strategies

Blending diesel with biofuels, such as ethanol and palm oil methyl ester (PME), enhances the fuel properties and produces improved engine performance and low emissions. However, the presence of ethanol, which has a small cetane number and low heating value, reduces the fuel ignitability. This work aimed to study the effect of injection strategies, compression ratio (CR), and air intake temperature (Ti) modification on blend ignitability, combustion characteristics, and emissions. Moreover, the best composition of diesel–ethanol–PME blends and engine modification was selected. A simulation was also conducted using Converge CFD software based on a single-cylinder direct injection compression ignition Yanmar TF90 engine parameter. Diesel–ethanol–PME blends that consist of 10% ethanol with 40% PME (D50E10B40), D50E25B25, and D50E40B10 were selected and conducted on different injection strategies, compression ratios, and intake temperatures. The results show that shortening the injection duration and increasing the injected mass has no significant effect on ignition. Meanwhile, advancing the injection timing improves the ignitability but with weak ignition energy. Therefore, increasing the compression ratio and ambient temperature helps ignite the non-combustible blends due to the high temperature and pressure. This modification allowed the mixture to ignite with a minimum CR of 20 and Ti of 350 K. Thus, blending high ethanol contents in a diesel engine can be applied by advancing the injection, increasing the CR, and increasing the ambient temperature. From the emission comparison, the most suitable mixtures that can be operated in the engine without modification is D50E25B25, and the most appropriate modification on the engine is by increasing the ambient temperature at 350 K.

Modelling of Spray–Swirl Interaction in Direct Injection Diesel Engine Combustion Chambers

1985 ◽  
Vol 199 (3) ◽  
pp. 187-198 ◽  
Author(s):  
P S Mehta ◽  
A K Gupta
Keyword(s):  
Diesel Engine ◽  
Fuel Injection ◽  
Direct Injection ◽  
Three Dimensional ◽  
Combustion Chambers ◽  
Direct Injection Diesel Engine ◽  
Wide Range ◽  
Engine Combustion ◽  
Computation Scheme ◽  
Good Agreement

A mathematical model for predicting spray–swirl interaction in a direct injection diesel engine combustion chamber is developed using centre-line velocity vector/continuum approach. The model has three-dimensional features in fuel spray motion. The present model responds to the various air swirl, fuel injection and cylinder charge conditions. The predicted results are compared with the analytical and experimental data available from various sources in the two-dimensional case. Very good agreement is achieved over a wide range of data. The three-dimensional predictions are directly possible without any alteration in the computation scheme.

Optimum control of an automotive direct injection diesel engine for low exhaust emissions

2001 ◽  
Vol 215 (11) ◽  
pp. 1225-1236 ◽  
Author(s):  
M Capobianco
Keyword(s):  
Diesel Engine ◽  
Control Strategies ◽  
Direct Injection ◽  
Experimental Information ◽  
Operating Conditions ◽  
Pollutant Emissions ◽  
Control Variables ◽  
Wide Range ◽  
Di Diesel Engine ◽  
Definition Of

The paper presents the latest results of a wide investigation performed at the University of Genoa on the control of automotive direct injection (DI) diesel engines. A dedicated procedure was developed which enables analysis of the behaviour of engine operating parameters as a function of two control variables with a limited amount of experimental information and the definition of proper control strategies. A first application of the procedure is presented in the paper with reference to a typical turbocharged DI diesel engine for automotive applications. The exhaust gas recirculation (EGR) rate and the position of the turbocharger waste-gate regulating valve were assumed as control variables and the behaviour of the most important engine parameters was analysed in a wide range for 15 steady state operating conditions related to the European driving cycle. Particular attention was paid to the most significant pollutant emissions and to the exhaust boundary conditions for the application of a low temperature lean de-NOx catalyst. Two different control strategies were also developed by which the catalyst conversion efficiency and the NOx engine tail pipe emission were individually optimized, taking account of some operating limits for specific parameters.

Vehicle Emission Analysis by using Refined Sunflower Oil as Alternate Fuel and Varying the Injection Timing in Diesel Engine

2020 ◽  
Vol 12 (1) ◽  
Author(s):  
J. Hemanandh ◽  
S. Ganesan ◽  
C. Sathya Sai Puneeth ◽  
G. Venkata Sai Naga Manikankata Tejesh
Keyword(s):  
Diesel Engine ◽  
Compression Ratio ◽  
Sunflower Oil ◽  
Methyl Esters ◽  
Direct Injection ◽  
Vehicle Emission ◽  
Injection Timing ◽  
Emission Analysis ◽  
Exhaust Temperature ◽  
Alternate Fuel

In this study, the emissions of Kirloskar Direct Injection 4-stroke Diesel engine, single cylinder air cooled, 4.4 kW, constant speed at 1500 rpm, compression ratio 17.5:1 with different blends of diesel refined sunflower oil is analysed. Methyl Esters of refined sunflower was trans-esterified before blending with diesel. The main objective of this experiment is to study the NOx, CO, HC and smoke emissions by varying the injection timing and load. The experiments were conducted with various blends - BRSF10, BRSF30, BRSF40, at different pressures (180 bar, 210 bar, and 240 bar) and different level of loads (0%, 25%, 50%, 75%, 100%). A 3-hole nozzle was used to inject the fuel. The combustion results were studied using AVL gas analyser. The results show that engine temperature decreases at higher loads by 2°, NOx and CO decreases and there was a marginal increase in HC and the exhaust temperature.

Sign in / Sign up

Export Citation Format

Share Document