Fuel Injection Timings of a Direct Injection Diesel Engine Running on Neat Lemongrass Oil-Diesel Blends

In diesel engine, fuel injection timing is a major parameter that affects combustion, performance and emission characteristics. Variation in injection timing has a strong effect on BTE, BSFC, BSEC, smoke and NOx emissions because of the change in maximum pressure and temperature in engine cylinder. In this experimental investigation, the optimum performance DEE-diesel blend ratio DE15D (15% DEE and 85% diesel by volume) was tested for variable injection timings to evaluate its effect and determine the optimum fuel injection timing, as the addition of DEE to diesel fuel causes retardation in dynamic injection timing. The engine tests were carried out at 10%, 25%, 50%, 75% and 100% of full load with 3º and 6º advancement, base and 3º and 7º retarded injection timings. The test results show that BSFC and BSEC provide the best result for the base injection timing at full load condition. The 6 º advancement in injection timing at full load condition reduced smoke by 12.5% and HC by 15.38%. The retarded injection timing by 7º at full load showed improvement in BTE by 7.96% and in NOx by 3.66%.

Section: Nox Emissionmentioning

confidence: 99%

Section: Nox Emissionmentioning

confidence: 99%

The effect of injection timing on the performance and emission of direct injection CI engine running on diethyl ether-diesel blends

Patil¹,

Thipse²

2016

“…However, this in turn makes ignition difficult in CI engines. A possible means of overcoming these drawbacks is to extract the CO2 content of biogas, thereby increasing the combustible fraction and making it a more viable alternative fuel [6,7,[23][24][25][26]. This purification process is known as methane enrichment.…”

Section: Introductionmentioning

confidence: 99%

A review on the purification and use of biogas in compression ignition engines

Feroskhan¹,

Ismail²

2017

Biogas is commonly produced during the decay of organic matter. It is a mixture of methane and some non-combustible gases such as CO2 and H2S. Its viability as a renewable alternative fuel for internal combustion engines can be enhanced by methane enrichment, i.e. removal of the non-combustible constituents. One of the common techniques for using biogas in a compression ignition (CI) engine is to mix it with air in the intake manifold, induct, and compress this mixture and ignite it by injecting a small quantity of diesel or bio-diesel, which is termed as the pilot fuel. This is known as the dual fuel mode. The pilot fuel is injected close to the end of the compression stroke as in a conventional CI engine and the injected fuel quantity depends on the operating condition. An alternative approach is the Homogeneous Charged Compression Ignition (HCCI) mode. Here, a homogeneous mixture of biogas and air is inducted and compressed by the piston until it auto-ignites. While this concept combines the benefits of spark ignition (SI) and CI engines, the onset of combustion cannot be controlled directly. A detailed review of recent research pertaining to biogas purification techniques and operation of CI engines with biogas in dual fuel and HCCI modes is presented in this paper. The effects of various operating parameters on engine performance and emissions, and comparison with conventional diesel fuelled CI engines are discussed. Biogas improves combustion efficiency, NOx, and smoke emissions. However, it reduces brake thermal efficiency, volumetric efficiency, and increases HC and CO emissions. Biogas fuelling of CI engines is recommended for achieving high diesel substitution, especially under high torque operation.

“…In addition, this is efficient in order to obtain better biodiesel characteristics, such as minor density and viscosity variations, lower aromatic hydrocarbons content and a more convenient sprays morphology of the injected biofuel inside the combustion chamber [37][38][39][40][41]. Hence, in this research work, the results of different tests performed in order to characterise the sprays morphology provided by a diesel injector, varying injection pressure and opening time, are shown; four fuel typologies were tested, three types of biodiesel and the conventional diesel [42][43][44][45][46][47][48][49]. Using a fast camera, the images related to spray injections were acquired and post-processed using a LabVIEW software, thereby characterising each injected spray related to a particular fuel typology and comparing the morphology (spray penetration depth and shape ratio) of the different performed injections for each tested fuel.…”

Section: Introductionmentioning

confidence: 99%

Morphological analysis of injected sprays of different bio-diesel fuels by using a common rail setup controlled by a programmable electronic system

Visconti¹,

Primiceri²,

Strafella³

et al. 2017

Biodiesel fuels are increasingly attracting interest in the scientific community and in the world motor industry. The morphological analysis of injected sprays is a key factor to increase engine performances using new biodiesel fuels and to compare them with those related to the use of conventional fuels. In this paper, an experimental setup is realised to carry out test campaigns, in order to analyse and compare the spray injections of different fuel typologies. A PC-interfaced electronic system was realised for driving BOSCH injectors and for varying the injection pressure and opening time. Hence, the morphological analysis was performed for each tested fuel by characterising the shaperatio and penetration depth inside the velocimetric chamber. The results show higher penetration values for biodiesel fuels due to their viscosity and drops in superficial tension, which facilitate a deeper penetration compared to those obtained with conventional diesel fuels. Although used biodiesels contain only 20% of renewable vegetable-origin diesel fuels, the viscosity and superficial tension are slightly higher than those of petroleum diesel, thus determining a weak vaporisation and formation of larger drops. By knowing the morphological behaviour of sprays using biofuels and conventional fuel, it is possible, by using programmable electronic systems, to adjust and improve the spray parameters in order to obtain better engine performances. The results reported in this instance could be utilised by future research works for choosing the most suitable biofuel based on the desired morphological behaviour of the injected sprays.