IDI Engine With Alternate Fuels

IDI Engine With Alternate Fuels

Venkata Appa Rao Basava (Andhra University, India), Aditya Kolakoti (Raghu Engineering College, India), and Prasada Rao Kancherla (NRI Institute of Technology, India)
DOI: 10.4018/978-1-7998-4939-1.ch002
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A plethora of experiments were conducted on IDI engine with various biodiesels (e.g., methyl esters of mahua, jatropha, rice bran, pongamia, palm, beef tallow, and waste cooking oils). Review of the results of these endeavors with various additives and blends with or without super charging of the engine are presented in this chapter. All these attempts have been concentrated to arrive at the best yield from a single cylinder engine. The recorded pressure changes during combustion, the derived heat release rates, and exhaust emissions are presented in the form of plots at various loads and at a constant speed. Engine cylinder vibrations (reflect combustion excitation) in the form of FFT and time waves were recorded at radial points and vertical on the cylinder body to assess the combustion propensity in all cases of studies. The results with relative benefits are enumerated.
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Experimental studies were conducted to evaluate the performance, emissions, combustion and heat release rate of an Indirect Diesel Injection (IDI) engine with comprehensive engine cylinder vibration proof to substantiate better combustion. The summery of all endeavors yield good evidence that various biodiesel applications either blending with diesel or mixing any additive proved better than the implementation of diesel fuel in a neat form. In the present study, the experimental investigation by K Prasada Rao and B V Appa Rao (2017) used neat Mahua methyl ester (MME) along with Methanol additive blends. Since the auto ignition temperature of methanol is 4700C, it may not be initiator to combustion in the pre combustion chamber but, a part of the biodiesel in the blend may be set to combustion. The authors K Prasada Rao and B V Appa Rao (2017) in the experimental proposal chose to take 1% to 5% methanol blends and finally concluded that 3% methanol blend yielded better results. The author’s conception is that the higher latent heat methanol reduces the combustion temperature and there by reduces NO component in the exhaust gas. Normally methanol increases the CO formation. But it is an incidental observation that CO also reduced by 20% at the maximum load, indicates that the presence of methanol increased the air fuel entrainment the evaporation mode at low lower evaporation temperature in both the chambers leading to near totality of the combustion. In another endeavor, by Y Ashok Kumar Reddy (2013) it is not crude oil but the heated Jatropha methyl ester (JME) was tested to verify the results and it yielded better results over the unheated biodiesel or the petroleum-based diesel. The author has observed that the viscosity of biodiesel can be decreased by heating the oil to a level close on parity with the diesel oil’s viscosity at 600C and above this temperature the oil became critical indicating no more further reduction in the viscosity. Thermal efficiency of the engine is under greater control with 600C heated JME and it has shown betterment at higher operating loads of the engine. At other higher input oil temperatures, the heat losses may be reason for lesser thermal efficiency values comparatively. Predictably, the exergy is better and the irreversibility is contained with preheating of the oil to 600C.

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