Some Aspects of Combustion and Heat Release in Diesel Engines

1977 ◽  
Author(s):  
K.S. Kannan
Keyword(s):  
Diesel Engine ◽  
Diesel Engines ◽  
Digital Computer ◽  
Valve Closure ◽  
Inlet Valve ◽  
First Law Of Thermodynamics ◽  
Valve Opening ◽  
The University ◽  
University Of Manchester ◽  
Heat Released

The author discusses the various stages of combustion in diesel engines from experiments conducted by himself and also by various other research workers in this field. He then outlines the technique used in predicting heat released by the fuel during combustion in a diesel engine - a techniq ue on which he has worked during his Master's course at the University of Manchester Institute of Science and Technology. The technique consists of applying the first Law of Thermodynamics in steps of the period from inlet valve closure to exhaust valve opening. The First Law equation applicable is reformulated so as to be used on the digital computer.

scholarly journals Design and Build Temperature Control and Monitoring in Diesel Engines Using Mobile

2020 ◽  
Vol 10 (1) ◽  
pp. 31-37
Author(s):  
Mohammad Hasan Fuadi
Keyword(s):  
Diesel Engine ◽  
Temperature Control ◽  
Diesel Engines ◽  
Temperature Sensor ◽  
Cooling System ◽  
Cooling Water ◽  
Solenoid Valve ◽  
Valve Opening ◽  
Opening And Closing ◽  
And Control

Diesel engines is generally used for industrial and agricultural machines. Few people care about the engine temperature so it is forced to reach temperature of 100oC, which causes overheating of the diesel engine and has an impact on the performance itself. This also uses a hopper cooling system which is certainly not effective, because it's necessary to see that the water in the reservoir is still or not, also not equipped with an engine temperature display so it's difficult to ascertain the temperature inside. This study aims to monitor and control the temperature of cooling water. Operation of temperature control uses a telecontrol system that is connected to network (Internet of Things) so diesel temperature control can be done remotely. Monitoring of temperature and water level in the reserve tank using Web Mobile. In addition, there is a temperature sensor that is used to measure the temperature of the cooling water so that users can monitor the temperature of the diesel engine on Web Mobile. The test results obtained, the temperature sensor has an average temperature reading error of 0.031004%. Diesel engines with controlled solenoid valve cooling systems can produce ideal temperatures compared to when the solenoid valve is open (using the radiator continuously) or when the solenoid valve is Closed (without using a radiator). When the solenoid is controlled the engine temperature can be ideal because the solenoid valve opening and closing system has the lowest temperature of 56.34oC and the highest temperature of only 80.85oC.

Valve and In-Cylinder Flow Generated by a Helical Port in a Production Diesel Engine

1987 ◽  
Vol 109 (4) ◽  
pp. 368-375 ◽  
Author(s):  
C. Arcoumanis ◽  
C. Vafidis ◽  
J. H. Whitelaw
Keyword(s):  
Diesel Engine ◽  
Laser Doppler Anemometry ◽  
Operating Conditions ◽  
Valve Lift ◽  
Valve Closure ◽  
Rapid Decay ◽  
Inlet Valve ◽  
Compression Stroke ◽  
Axial Velocity Distribution ◽  
Cylinder Flow

The flow generated by the helical port of a production Diesel engine has been investigated by laser Doppler anemometry under steady flow and operating conditions at ∼ 900 rpm and compression ratio of 8. The flow around the valve periphery was found to be non-uniform with the axial velocity distribution being more sensitive to valve lift. The in-cylinder swirl distribution at inlet valve closure exhibited an axial stratification in the disc-chamber while turbulence intensity remained constant in the clearance volume during the rest of the compression stroke with levels of 0.5 vp and a minimum of about 0.4 vp at top-dead-center following a rapid decay at θ=340°.

Computer aided study of the transient performances of a highly rated sequentially turbocharged marine diesel engine

1998 ◽  
Vol 212 (3) ◽  
pp. 185-196 ◽  
Author(s):  
X Tauzia ◽  
J F Hetet ◽  
P Chesse ◽  
G Crosshans ◽  
L Mouillard
Keyword(s):  
Experimental Data ◽  
Diesel Engine ◽  
Diesel Engines ◽  
Marine Diesel Engine ◽  
Computer Aided ◽  
Compressor Surge ◽  
Marine Diesel ◽  
Valve Opening ◽  
Transient Phases ◽  
Good Agreement

The sequential turbocharging technique described in this paper leads to an improvement in the operations of highly rated diesel engines, in particular at part loads (better air admission). However, transient phases such as a switch from one turbocharger to two turbochargers can be difficult, mainly because of the inertia of the turbochargers. In order to simulate the dynamics of turbocharged diesel engines, the SELENDIA software has been extended. When applied to two different engines (12 and 16 cylinders), the program shows good agreement with the experimental data. Moreover, the compressor surge has been investigated during faulty switch processes. The software has then been used for predictive studies to evaluate the possibility of adapting sequential turbocharging to a 20-cylinder engine and to calibrate the optimum switching conditions (air and gas valve opening timing).

scholarly journals Non-catalytic NOx reduction for marine Diesel engine: an experimental approach

2021 ◽  
Vol 312 ◽  
pp. 07015
Author(s):  
Anna Maria Raspolli Galletti ◽  
Stefano Frigo ◽  
Marco Antonelli ◽  
Gianluca Pasini ◽  
Paolo Bertetti ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Diesel Engines ◽  
Nox Reduction ◽  
Air Pollutant ◽  
Department Of Energy ◽  
Pollutant Emissions ◽  
Nox Abatement ◽  
Experimental Apparatus ◽  
First Results ◽  
The University

Recent legislation concerning air pollutant emissions from ships (Tier III) has considerably decreased NOx emission limits for recreational ships with less than 500 gross tonnages and greater than 24 m load line length (LLL), the so-called “large yachts”. For these yachts, which adopt multiple Diesel engines with maximum power ranging from 800 to 2000 kW, the new NOx limit is less than 2 g/kWh. To satisfy that limit, engine makers suggest the adoption of a classic SCR system with urea injection but this methodology, in addition to requiring a large space for installation, does not seem so appropriate for diesel engines of large yachts that normally operate at low power with exhaust temperatures often well below 300 °C, therefore not sufficient to allow the correct functioning of the SCR. The aforementioned circumstances have prompted Sanlorenzo Spa (La Spezia – Italy), one of the world’s leading companies in the production of pleasure boats, to collaborate with the University of Pisa in the study of alternative solutions to SCR systems. Recently there is a great interest in innovative NOx abatement systems, based on the possibility of absorbing NOx molecules into seawater through the utilization of appropriate aqueous solutions containing targeted saline oxidizing agents. The present study describes the first results of a research program aimed to identify, from one side, the best saline oxidizing agent for an aqueous NOx abatement and, from the other, the best washing methodology compatible with the propulsion layouts usually adopted on yachts. In the engine testing laboratories of the Department of Energy, Systems, Territory and Construction Engineering (DESTeC) of the University of Pisa, an experimental apparatus has been created to reproduce the real conditions of underwater engine exhausting. This device was combined with a small 1.2 L direct injection diesel engine. The first results showed a reduction of the NOx emissions of about 27% by using a gas washing with wet scrubber, followed by bubbling in water, using 0.2 molar NaClO saline solutions.

scholarly journals Optimization of Piston Grooves, Bridges on Cylinder Head, and Inlet Valve Masking of Home-Fueled Diesel Engine by Response Surface Methodology

2021 ◽  
Vol 13 (20) ◽  
pp. 11411
Author(s):  
Mathad R. Indudhar ◽  
Nagaraj R. Banapurmath ◽  
K. Govinda Rajulu ◽  
Arun Y. Patil ◽  
Syed Javed ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Response Surface ◽  
Diesel Engines ◽  
Cylinder Head ◽  
Vertical Cylinder ◽  
Inlet Valve ◽  
Combustion Duration ◽  
Honge Oil Methyl Ester ◽  
Biodiesel Fuels ◽  
Designs Of Experiments

Naturally replenished biodiesel fuels are more precise in place of diesel engine applications as they have complying thermal properties, which are extensively used by various researchers. However, there is necessity to optimize their utility to meet stringent emission norms as per Bharat Stage VI (BS VI) and Euro 6. From the exhaustive survey on the studies, number of piston grooves (NG), number of grooves-n-bridges on cylinder head (Gr-Br), and inlet valve masking (IVM) using the response surface methodologies (RSM) technique have not been reported on the competence, emissions, and combustion attributes of diesel engines running on Honge oil methyl ester (HOME), hence this is an identified gap in literature. The present simulation work is for optimizing the performance and lessoning exhaust emitted from the diesel prime mover tested on non-conventional and petro fuels. Experimentation was carried out to inquest the competence, combustion, and emittance of a vertical cylinder, overhead valve, water cooling, open or induction swirl diesel engine running on HOME as the injecting fuel. The object of the present effort is to optimize competence of diesel engines via a statistics inquest called designs of experiments (DoE). To curtail the diverse variations to be experimented on, full factorial designs (FFDs) array was employed. The response surface methodologies (RSM)-based nonlinear or quadratic predictors establish the relation between the input parameters and proposed attributes. The RSM-based mathematical predictors are established to prognosticate the distinguished engine output attributes at 95% confidence interval. The response surface assay discovered that a combination of 2B 3G, ‘IVM’ of 900, and ‘NG’ of six grooves yields highest brake thermal efficiency (BTE), lessoning smoke, carbon monoxide (CO), and hydrocarbon (HC), but nitrogenous oxides (NOx) emissions increased slightly. Additionally, combustion attributes, such as Ignition delay (ID) and combustion duration (CD), were lessoned, but peak pressure (PP) and heat release rate (HRR) had a higher contrast to performance of HOME biodiesel in a conventional CI engine.

A novel strategy of extremely delayed intake valve opening to improve the cold-start characteristics of a low compression ratio diesel engine

2021 ◽  
pp. 146808742110346
Author(s):  
V Vikraman ◽  
K Anand ◽  
A Ramesh
Keyword(s):  
Diesel Engine ◽  
Compression Ratio ◽  
Diesel Engines ◽  
Cold Start ◽  
Stagnation Temperature ◽  
Oxides Of Nitrogen ◽  
Intake Valve ◽  
Air Velocity ◽  
Valve Opening ◽  
Novel Strategy

Combined in-cylinder and after-treatment emission control methods are generally adopted to meet the current stringent emission targets for diesel engines. It is well established that reducing the geometric compression ratio (CR) results in a simultaneous reduction in the oxides of nitrogen (NOx) and soot emissions in diesel engines. However, poor cold-start characteristics prevent extensive use of low compression ratio (LCR) diesel engines for automotive applications. In the present work, a novel extremely delayed intake valve opening (IVO) strategy is proposed to improve the cold-start characteristics of a light-duty LCR diesel engine. A commercial one-dimensional gas-exchange model was used to optimize the intake valve open and close timings. The results corresponding to a cranking speed of 200 rpm and ambient temperature of 0°C show that advancing the intake valve close (IVC) timing increases the effective compression stroke that can improve the cylinder temperature by 5%. Further, implementing ‘extremely delayed IVO’ by retarding the timing from 1°CA to 61°CA aTDC could help to further increase the cylinder temperature by 14% compared to the base timings. The delayed opening of the intake valve leads to a higher expansion of the cylinder mass, leading to a lower cylinder pressure before IVO and a higher intake air velocity immediately after IVO. With the higher intake air velocity, the incoming air’s kinetic energy is dissipated to increase the stagnation temperature, resulting in an overall benefit in cylinder temperature. The experimental measurements conducted in a cold chamber with the optimized IVO and IVC timings confirmed the benefits by achieving a better cold-startability of the LCR engine. In comparison, the LCR engine with the stock valve timings could be started only up to +5°C, the optimized valve timings could ensure startability up to −10°C without any starting aids. Thus, the proposed approach of adopting the optimized valve timings can help LCR diesel engines to overcome the limitations of cold-startability.

scholarly journals Professor George Archibald Grant Mitchell (1906–1993): his work with penicillin during World War II

2021 ◽  
pp. 096777202110121
Author(s):  
Peter D Mohr ◽  
Stephanie Seville
Keyword(s):  
Nervous System ◽  
World War Ii ◽  
Autonomic Nervous System ◽  
Middle East ◽  
World War ◽  
Army Medical ◽  
Autonomic Nervous ◽  
Penicillin Therapy ◽  
The University ◽  
University Of Manchester

George Archibald Grant Mitchell, OBE, TD, MB, ChB, ChM, MSc, DSc, FRCS (1906–1993) was a professor of anatomy at the University of Manchester from 1946 to 1973. He is mainly remembered for his research in neuroanatomy, especially of the autonomic nervous system. He studied medicine at the Aberdeen University, and after qualifying in 1929 he held posts in surgery and anatomy and worked as a surgeon in the Highlands. In 1939, he joined the Royal Army Medical Corps. He was based in Egypt and the Middle East, where he carried out trials of sulphonamides and penicillin on wounded soldiers; in 1943, he returned to England as Adviser in Penicillin Therapy for 21 Army Group, preparing for the invasion of Europe.

In Conversation on the Royal Exchange Theatre, Manchester

2020 ◽  
Vol 36 (4) ◽  
pp. 369-383
Author(s):  
Rachel Clements ◽  
Sarah Frankcom
Keyword(s):  
Caryl Churchill ◽  
Cultural Organization ◽  
The University ◽  
Artistic Director ◽  
University Of Manchester ◽  
The Way ◽  
Death Of A Salesman

Sarah Frankcom worked at the Royal Exchange Theatre in Manchester between 2000 and 2019, and was the venue’s first sole Artistic Director from 2014. In this interview conducted in summer 2019, she discusses her time at the theatre and what she has learned from leading a major cultural organization and working with it. She reflects on a number of her own productions at this institution, including Hamlet, The Skriker, Our Town, and Death of a Salesman, and discusses the way the theatre world has changed since the beginning of her career as she looks forward to being the director of LAMDA. Rachel Clements lectures on theatre at the University of Manchester. She has published on playwrights Caryl Churchill and Martin Crimp, among others, and has edited Methuen student editions of Lucy Prebble’s Enron and Joe Penhall’s Blue/Orange. She is Book Reviews editor of NTQ.

scholarly journals Fault Detection of Diesel Engine Air and after-Treatment Systems with High-Dimensional Data: A Novel Fault-Relevant Feature Selection Method

Processes ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 259
Author(s):  
Qilan Ran ◽  
Yedong Song ◽  
Wenli Du ◽  
Wei Du ◽  
Xin Peng
Keyword(s):  
Genetic Algorithm ◽  
Diesel Engine ◽  
Fault Detection ◽  
Correlation Analysis ◽  
Canonical Correlation Analysis ◽  
Diesel Engines ◽  
Canonical Correlation ◽  
High Dimensional Data ◽  
High Dimensional ◽  
Relevant Variables

In order to reduce pollutants of the emission from diesel vehicles, complex after-treatment technologies have been proposed, which make the fault detection of diesel engines become increasingly difficult. Thus, this paper proposes a canonical correlation analysis detection method based on fault-relevant variables selected by an elitist genetic algorithm to realize high-dimensional data-driven faults detection of diesel engines. The method proposed establishes a fault detection model by the actual operation data to overcome the limitations of the traditional methods, merely based on benchmark. Moreover, the canonical correlation analysis is used to extract the strong correlation between variables, which constructs the residual vector to realize the fault detection of the diesel engine air and after-treatment system. In particular, the elitist genetic algorithm is used to optimize the fault-relevant variables to reduce detection redundancy, eliminate additional noise interference, and improve the detection rate of the specific fault. The experiments are carried out by implementing the practical state data of a diesel engine, which show the feasibility and efficiency of the proposed approach.

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