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In this study, a statistical correlation was established among the input parameters, namely, ambient temperature (AT), oil injection orifice (OIO) size, and cooling fan speed with free air delivery (FAD), input power (IP), and discharge oil temperature (DOT) of an electric-powered twin screw air compressor. Experiments were designed based on a central composite design (CCD). A response optimizer is used to identify the combination of input operating parameter settings that optimizes responses independently and collectively. A model considering all responses together with equal priorities provides the maximum FAD of 254.71 cfm and minimum IP of 44.16 kW by setting the compressor with an AT of 44°C, OIO size of 4.0 mm, and a cooling fan speed of 1220 rpm. Higher ambient conditions are achieved for experimental purposes by designing a hot chamber wherein hot air from the cooling fan exhaust is mixed with the ambient air.

This article is focused on the development of hydrogen fuelled engine with detailed exposure on its derivation from base Compressed Natural Gas (CNG) engine to discuss the phenomenon on backfiring, control strategies (to avoid knocking and backfiring) and its performance, emission characteristics. In this work, timed manifold injection system was developed to have efficient control over the fuel supply. To achieve the best performance and emission out of the engine, governing parameter like injector pulse width and ignition timing were optimized at full load, part load and idling. For comparison of the results with the same engine experiments were also conducted with base fuel CNG and gasoline using the conventional fuel supply system. It was experimentally observed that engine when fuelled with Hydrogen (H2) produces less maximum power compared to CNG and gasoline.

Though there are different chemicals used in oxygenated diesels, their high level blending has its own disadvantages. For this investigation, three compounds were selected on the basis of their oxygen level and flash point [1]. These low level blends are tested in a single cylinder naturally aspirated direct injection diesel engine. Performance of the blended diesel compared with the performance of pure diesel. The influence of the blended diesel on power, brake thermal efficiency, cylinder peak pressure, smoke level and particulate matter are studied. From the tests it was concluded that 2-Ethoxy Ethanol performs better in terms of both emission and efficiency.