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|Title:||"COLD FLOW STUDIES TO UNDERSTAND THE SCAVENGING PATTERN AND IMPROVE THE PERFORMANCE OF A TWO STROKE ENGINE AT PART LOAD OPERATION"|
|Authors:||Srivastava, Alok Kumar|
|Keywords:||MECHANICAL & INDUSTRIAL ENGINEERING;SCAVENGING PATTERN;COLD FLOW;TWO STROKE ENGINE|
|Abstract:||The two-stroke engines are finding wider acceptability because these are comparatively simple in construction and involve lower costs. The inherent disadvantages of high specific fuel consumption and high level of exhaust emissions had been the biggest constraints in its progress as compared to their counter parts - the four stroke engines. Various efforts have been made to analyse the basic processes. It has been established that the scavenging process is one of the most important processes affecting the performance of the engine, because the availability of fuel-air mixture in adequate quantity and quality for proper and complete combustion is highly dependent upon the efficacy of the scavenging process. Several methods have been evolved to study and investigate the scavenging process, but with limited success. The highly complex and transient nature of the process makes it imperative to have a simple but effective approach from which the nature of the scavenging process can be interpreted. . An experimental method has been used, in the present work, to investigate the scavenging process by studying the scavenging flow pattern under simulated, steady flow conditions. It involves the pressure measurements at various points in the cylinder in the horizontal and vertical planes. Subsequently flow velocity vectors have been determined from the pressure data and presented graphically to enable one to (v) understand and analyse the scavenging flow pattern in the cylinder. These are obtained for different flow conditions. A careful analysis of the static pressure field and the velocity field enables one to analyse the scavenging flow pattern. From the knowledge of the scavenging flow pattern under various flow conditions, one can deduce the influence of the controllable parameters like the geometry of the transfer ports on the scavenging flow pattern. In the present work one of the existing engines, has been studied under simulated, steady flow conditions with the basic objective of investigating the effectiveness of the scavenge ports. The analysis of the pressure and velocity fie-lds inside the cylinder, along with the quasi-steady analysis of the inlet and exhaust processes, clearly bring out the fact that inadequate scavenging occurs in the existing engine. Further, this analysis suggests the causes for the poor scavenging pattern and possible modifications that should be made to achieve a better scavenging. The scavenge ports were then modified and the scavenging flow pattern was reevaluated. The results indicate the effectiveness and usefulness of this.. method over the existing methods. The results also bring out clearly the sensitiveness of the flow pattern to the ports construction which could not have not been ascertained by any other method.|
|Research Supervisor/ Guide:||Prakash, Satya|
|Appears in Collections:||MASTERS' DISSERTATIONS (MIED)|
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