NOx Prediction in a Dual fuel CI Engine

Murthy, Krishna and Vijay, G S and Rao, Srinivasa B R (2016) NOx Prediction in a Dual fuel CI Engine. In: International multidisciplinary research conference, 02/02/2016, Colombo.

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Abstract

Diesel engine performance is comparatively superior to its counterpart petrol engines with lower specific fuel consumption. However diesel engines are notorious for higher level of NOx emissions and Particulate Matter (PM) at near to full load conditions. Use of gaseous fuel to supplement the liquid fuel and operating the engines in dual fuel mode results in reduced emissions at near full load conditions. The control of relative proportion of liquid fuel and gaseous fuel is an important aspect in controlling the combustion performance and hence engine out emissions. This paper presents a computational method for the prediction of engine out NOx from the dual fuel compression ignition (CI) engine. The experiments were conducted at different loads and relative proportion of diesel and LPG. The different performance parameters and emissions were obtained and used for the validation of computation results. A two-zone combustion model has been developed using MATLAB customised codes to predict the in-cylinder pressure rise, heat release rate NOx formation using engine parameters, fuel characteristics and fuel consumption rate. The outputs of combustion model are used to predict the NOx formation. In order to estimate the rate of NOx formation the combustion event is divided into steps of 10 Crank Angle (CA). Analysis of both inducted and injected fuel has been carried out separately using Extended Zeldovich equation. The species mole fractions of different products are obtained from Olikera Model. The NOx formed at each CA is added together until the temperature inside the combustion zone drops to 1700K, called as engine out NOx and compared with experimental results.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: Dual fuel engine, LPG, engine out NOx, in-cylinder pressure, combustion model
Subjects: Engineering > MIT Manipal > Mechanical and Manufacturing
Depositing User: MIT Library
Date Deposited: 07 Jan 2017 11:01
Last Modified: 07 Jan 2017 11:01
URI: http://eprints.manipal.edu/id/eprint/147924

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