Experimental measurement of big-end bearing journal orbits

2000 ◽  
Vol 214 (3) ◽  
pp. 219-228 ◽  
Author(s):  
M. J. Goodwin ◽  
C Groves ◽  
J Nikolajsen ◽  
P. J. Ogrodnik
Keyword(s):  
Experimental Data ◽  
Experimental Approach ◽  
Theoretical Models ◽  
Compression Ignition ◽  
Bearing Surface ◽  
Connecting Rod ◽  
Compression Ignition Engine ◽  
Crankshaft Journal ◽  
Displacement Transducers ◽  
Load Conditions

This paper describes a novel experimental approach to the measurement of big-end bearing journal motion in reciprocating machinery. The procedure is based upon measurements recorded from inductive displacement transducers mounted in the crankshaft, which measure the instantaneous clearance between crankshaft journal and the big-end bearing surface of the connecting rod. The results of the work demonstrate that the procedure is a feasible way of collecting experimental data for comparison with the output from theoretical models. Experimental data are presented for a single-cylinder four-stroke compression ignition engine operating under various load conditions.

Assessment of the impacts of combustion chamber bowl geometry and injection timing on a reactivity controlled compression ignition engine at low and high load conditions

2020 ◽  
pp. 146808742096121
Author(s):  
Bahram Jafari ◽  
Mahdi Seddiq ◽  
Seyyed Mostafa Mirsalim
Keyword(s):  
Combustion Chamber ◽  
Fuel Consumption ◽  
High Load ◽  
Injection Timing ◽  
Compression Ignition ◽  
Compression Ignition Engine ◽  
Load Range ◽  
Reactivity Controlled Compression Ignition ◽  
Diesel Injection ◽  
Load Conditions

The present paper aims to assess the impacts of diesel injection timing and two bowl geometries including re-entrant and wide-shallow combustion chambers on the combustion characteristics, emissions formation, and fuel consumption in a reactivity controlled compression ignition diesel engine under low and high load (five and nine bar indicating mean effective pressure) conditions. The results revealed that diesel injection at −60 CA ATDC under low load conditions significantly decreased soot and NOx emissions simultaneously for both piston bowl geometries. The use of the wide-shallow chamber decreased the period of the ignition delay and increased the engine operable load range as a result of more stable combustion under high-load conditions compared to the re-entrant chamber. Moreover, at all diesel injection timings, the indicated specific fuel consumption was decreased by nearly 4.8 and 6.6% under low and high load conditions, respectively when the wide-shallow combustion chamber was used since the heat transfer loss was lower than that of the re-entrant chamber. However, NOx emission under high load conditions at the center of the combustion chamber and more soot emission in the exhaust gas are two disadvantages of the wide-shallow chamber versus the re-entrant combustion chamber.

On the Continuous Temperature Monitoring of an Engine Bearing

1977 ◽  
Vol 191 (1) ◽  
pp. 161-167 ◽  
Author(s):  
G. Goodwin ◽  
R. Holmes
Keyword(s):  
Fuel Oil ◽  
Lubricating Oil ◽  
Bearing Surface ◽  
Connecting Rod ◽  
Marine Diesel ◽  
Mechanical Linkage ◽  
Load Conditions ◽  
Continuous Temperature ◽  
Made In ◽  
Engine Bearing

Measurements of bearing surface temperature were made in a large end bearing of a marine diesel engine, the data being communicated by a mechanical linkage attached to the connecting rod. The engine was run with the lubricating oil heavily diluted with fuel oil, and also with a variety of load conditions on the test cylinder. Some observations were made immediately after a rapid start in order to assess the effects of priming of the lubrication system. The observations are discussed and some qualitative conclusions drawn.

scholarly journals ENERGY ANALYSIS OF KARANJA OIL AS A SUPPLEMENTARY FUEL FOR COMPRESSION IGNITION ENGINE

2016 ◽  
Vol 9 (2) ◽  
pp. 97-101
Author(s):  
Biplab Das ◽  
Pradip Lingfa
Keyword(s):  
Experimental Investigation ◽  
Diesel Engine ◽  
Diesel Fuel ◽  
Energy Analysis ◽  
Emission Characteristics ◽  
Compression Ignition ◽  
Compression Ignition Engine ◽  
Biodiesel Blends ◽  
Karanja Oil ◽  
Load Conditions

The paper highlights the results of an experimental investigation carried out on Karanja oil as a supplementary for diesel fuel in Compression Ignition engine. In the present study, triglycerides of Karanja oil is converted into mono-ester (biodiesel) using based catalyst transesterfication process. Karanja biodiesel is blended with petroleum diesel in the volumetric proportions of 2−10%. Results reveal that the performance characteristics of Karanja biodiesel blends are well comparable with diesel fuel. The emission characteristics such as CO, HC and smoke are found to be lower for Karanja biodiesel blends at all the engine load conditions compared to diesel fuel. Hence, it is concluded that Karanja oil at lower blends can be used in diesel engine without any substantial engine modification.

scholarly journals Study of Total Instantaneous Friction Torque of a Compression Ignition (CI) engine - A numerical and experimental approach.

2021 ◽  
Author(s):  
Seddak Mohammed ◽  
◽  
Lakhdari A. Amina ◽  
Keyword(s):  
Experimental Data ◽  
Experimental Approach ◽  
Accurate Estimate ◽  
Friction Torque ◽  
Compression Ignition ◽  
Load Torque ◽  
Compression Ignition Engines ◽  
Numerical Predictions ◽  
Ci Engine ◽  
Good Agreement

To be able to provide an accurate estimate of the effective torque, friction losses must be modeled. The details of a model that predicts the total instantaneous friction torque for compression ignition engines are described. The model is based on a combination between the dynamic model of the crankshaft and the thermodynamic model. The total instantaneous friction torque is determined, via the instantaneous measurements or numerical predictions of the gas pressure in the combustion chamber, the speed of rotation of the crankshaft and load torque. The comparison between the experimental data and the results of the numerical simulation shows a good agreement.

Development of Wobble-Plate-Type Fuel Pump in Compression Ignition Engine Fueled With Dimethyl Ether

2015 ◽  
Vol 137 (3) ◽  
Author(s):  
Hyun Kyu Suh
Keyword(s):  
Flow Rate ◽  
High Load ◽  
High Flow ◽  
Compression Ignition ◽  
Compression Ignition Engine ◽  
Fuel Pump ◽  
Fuel Flow ◽  
Type Fuel ◽  
Plate Type ◽  
Load Conditions

This experimental work describes the operation of a wobble-plate-type fuel pump for the stable supply of dimethyl ether (DME) fuel and evaluates its application possibility in a compression ignition engine. To achieve this, different types of flow control valves (normally open and normally closed types) were installed on the wobble-plate-type fuel pump. At the same time, the variations in fuel flow rate, torque, and temperature variation in the main parts of the pump were investigated under various operating conditions using a pump performance test system. In addition, a dummy-rail, which has half the volume of a common-rail, was installed to analyze pump stability under high flow rate/high load conditions. The wobble-plate-type fuel pump has showed satisfactory performance for DME fuel supply. The maximum flow rate (∼60 kg/h) is two times higher and the maximum torque value (∼32 N m) is three times higher than the required fuel flow and torque for stable driving of the DME engine (∼30 kg/h and ∼10 N m), respectively. Application of dummy-rail in wobble-plate-type fuel pump system would be a good solution to control the instability of pump operation in high flow rate/high load conditions.

Stress analysis of the connecting rod of compression ignition engine

2020 ◽  
Vol 33 ◽  
pp. 3722-3728
Author(s):  
S. Seralathan ◽  
Sai Viswanath Mitnala ◽  
RV. Sahith Kumar Reddy ◽  
Inturi Guru Venkat ◽  
Dadi Reddy Tejeswar Reddy ◽  
...  
Keyword(s):  
Stress Analysis ◽  
Compression Ignition ◽  
Connecting Rod ◽  
Compression Ignition Engine

Postinjection Strategy for the Reduction of the Peak Pressure Rise Rate of Neat n-Butanol Combustion

2016 ◽  
Vol 138 (9) ◽  
Author(s):  
Marko Jeftić ◽  
Ming Zheng
Keyword(s):  
Nitrogen Oxide ◽  
Thermal Efficiency ◽  
Peak Pressure ◽  
Pressure Rise ◽  
Compression Ignition ◽  
Cylinder Pressure ◽  
Compression Ignition Engine ◽  
Pressure Rise Rate ◽  
Rise Rate ◽  
Load Conditions

Enhanced premixed combustion of neat butanol in a compression ignition engine can have challenges with regards to the peak pressure rise rate (PRR) and the peak in-cylinder pressure. It was proposed to utilize a butanol postinjection to reduce the peak PRR and the peak in-cylinder pressure while maintaining a constant engine load. Postinjection timing and duration sweeps were carried out with neat n-butanol in a compression ignition engine. The postinjection timing sweep results indicated that the use of an early butanol postinjection reduced the peak PRR and the peak in-cylinder pressure and it was observed that there was an optimal postinjection timing range for the maximum reduction of these parameters. The results also showed that an early postinjection of butanol increased the nitrogen oxide emissions, and a Fourier transform infrared spectroscopy (FTIR) analysis revealed that late postinjections increased the emissions of unburned butanol. The postinjection duration sweep indicated that the peak PRR was significantly reduced by increasing the postinjection duration at constant load conditions. There was also a reduction in the peak in-cylinder pressure. Measurements with a hydrogen mass spectrometer showed that there was an increased presence of hydrogen in the exhaust gas when the postinjection duration was increased but the total yield of hydrogen was relatively low. It was observed that the coefficient of variation for the indicated mean effective pressure was significantly increased and that the indicated thermal efficiency was reduced when the postinjection duration was increased. The results also showed that there were increased nitrogen oxide, carbon monoxide, and total hydrocarbon (THC) emissions for larger postinjections. Although the use of a postinjection resulted in emission and thermal efficiency penalties at medium load conditions, the results demonstrated that the postinjection strategy successfully reduced the peak PRR, and this characteristic can be potentially useful for higher load applications where the peak PRR is of greater concern.

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