No abstract

At present, there is a hunt for an alternative source of fuel which should also cause less pollution. Vegetable oil is one such source, which is both renewable and biodegradable. But using straight vegetable oil lead to the clogging of the fuel injectors and there is a problem of starting especially when the engine is cold. Hence straight vegetable oils can be chemically treated to enhance its properties, after which the vegetable oil is known as biodiesel. In this work, biodiesel is prepared from Palm oil and then various tests (load test, Heat balance test and Emission test) are carried out on a Kirloskar engine (single cylinder D.I. diesel engine) by varying the percentage of biodiesel. It has been inferred from the test that performance of the engine decreases and also the various emissions (except NOx) decreases. It has also been inferred that the emissions reduction is maximum when biodiesel is blended with 60% diesel. To decrease NOx, hot EGR (15%) is adopted. Again the above tests are performed with EGR and it has been found that NOx decreases but at the same time the performance of the engine decreases further.

No abstract

A new mechanism for working of a rotary engine is suggested based on Brayton / Atkinson cycle. This mechanism is designed in such a way that the expansion volume in three times greater than the suction volume and in this engines the exhaust gases can expand inside the engine down to atmospheric pressure. This is expected to increase the work output, reduce the exhaust heat losses and exhaust noise. Also in this engine compression ratio of 20 can be attained with out using any auxiliary compressing unit where as which is not possible in a conventional Wankel diesel engine. This mechanism was developed and animated using “C” programming language and pressure, torque values are estimated with respect to the crank angle.