![]() The exhaust gas analysis apparatus consists of a series of analyzers for measuring soot, NOx, CO and total unburned Hydrocarbons (HC). For this purpose, finding new alternative energy sources in place of petroleum in internal combustion engines is becoming a necessity more than ever. The air pollution caused by automobiles and motorcycles is an important environmental problem to be solved. Now a day sustaining a clean environment has become an important issue in an industrialized society. The zero-dimensional model is based on the first law of thermodynamics in which an empirical relationship between the fuel burning rate and crank angle position is established. Ī zero-dimensional thermodynamic cycle model with two zone burnt/unburned combustion model, mainly based on Ferguson’s and Krikpatrick work, was developed to predict the cylinder pressure, work done, heat release, enthalpy of exhaust gas, and so forth. Burning rate analysis was carried out to determine the flame initiation period and the flame propagation period at different engine operating conditions. Soylu and Gerpen developed a two zone thermodynamic model to investigate the effects of ignition timing, fuel composition, and equivalence ratio on the burning rate and cylinder pressure for a natural gas engine. In- cylinder gas temperature and trapped mass under varying spark timing conditions were also calculated. Ĭhan and Zhu worked on modeling of in-cylinder thermodynamics under high values of ignition retard, in particular the effect of spark retard on cylinder pressure distribution. In recent years, however, ignition timing has brought increased attention to development of advanced SI engines for maximizing performance. In the early years, increasing engine power and engine working reliability were the principal aims for engine designers. Since the advent of Otto’s first four stroke engine, the development of the spark ignition engine has achieved a high level of success. Also it is one of the most important parameters for optimizing efficiency and emissions, permitting combustion engines to conform to future emission targets and standards. One of the most important ones is ignition timing. The performance of spark ignition engines is a function of many factors. Also engine speed and throttle position were all found to significantly influence performance in this engine. In conclusion, it obtained that ignition timing can be used as an alternative way for predicting the performance of internal combustion engines. O 2, CO 2, CO has been almost constant, but HC with advance of ignition timing increased and the lowest amount NO x is obtained at 10 BTDC. The results show optimal power and torque is achieved at 31☌A before top dead centre and volumetric efficiency, BMEP have increased with rising ignition timing. Methodįor achieving this goal, at a speed of 3400 rpm, the ignition timing has been changed in the range of 41° BTDC to 10° ATDC and for optimize operation, ignition timing has been designed at wide-open throttle and at last, the performance characteristics such as power, torque, BMEP, volumetric efficiency and emissions are obtained and discussed. Setting the correct ignition timing is crucial in the performance and exhaust emissions of an engine.The objective of the present work is to evaluate whether variable ignition timing can be effect on exhaust emission and engine performance of an SI engine. Ignition timing, in a spark ignition engine, is the process of setting the time that an ignition will occur in the combustion chamber (during the compression stroke) relative to piston position and crankshaft angular velocity.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |