Effect of intake manifold design on the mixing of air and bio-CNG in a port-injected dual fuel diesel engine
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Effect of intake manifold design on the mixing of air and bio‑CNG in a port‑injected dual fuel diesel engine Akash Chandrabhan Chandekar1 · Biplab Kumar Debnath1 Received: 25 October 2019 / Accepted: 17 March 2020 © Akadémiai Kiadó, Budapest, Hungary 2020
Abstract The awareness for an effective utilization of renewable energy and alternative fuels has been increasing. As alternative fuels, both liquid and gaseous biofuels have huge resources. A bio-CNG is a form of biogas with increased methane content. The present study comprises the development of intake manifold with the port fuel injector and investigate the mixing characteristics of air and bio-CNG. The aim of the study is to analyse the effect the R/D ratio on the flow behaviour and mixture formation of air and bio-CNG. The four configurations of intake manifold are investigated. The ratio of radius of curvature of manifold bend (R) to the diameter of manifold (D) is varied as 1, 1.5, 1.75 and 2. The port fuel injector for bio-CNG induction is placed at 200 mm from the manifold. The objective is to optimize the intake manifold to deliver the homogeneous mixture of air and bio-CNG inside the engine cylinder. As the bio-CNG is new age fuel, being produced to reduce the import of conventional CNG, the work for optimization of port injector and intake manifold are hardly available. The geometries are made in PTC-Creo 3.0, followed by CFD simulation in ANSYS Fluent. The different configurations are analysed for the comparison of the parameters such as, pressure, velocity, turbulence kinetic energy, helicity and mass fraction of C H4. The results show that the distribution of bio-CNG near the outlet of the manifold is uniform and homogeneous for the manifold with R/D ratio of 1.75 and 2. Keywords Dual fuel · Bio-CNG · Port injector · Helicity · Homogeneous mixture Abbreviations 3D Three-dimensional BTDC Before top dead centre CFD Computational fluid dynamics CH4 Methane CNG Compressed natural gas CO Carbon monoxide CO2 Carbon dioxide COV Coefficient of variation HC Hydrocarbon H2S Hydrogen disulphide IC Internal combustion LPG Liquefied petroleum gas
* Biplab Kumar Debnath [email protected] Akash Chandrabhan Chandekar [email protected] 1
Department of Mechanical Engineering, National Institute of Technology Meghalaya, Shillong, Meghalaya 793003, India
NOX Oxides of nitrogen PFI Port fuel injection
Introduction The internal combustion engines are always known to be economical for transportation, industrial operation and agricultural use. India needs to import petroleum fuel in immense quantity. This increases dependency of India to buy fuel from other countries by spending billions of rupees, which ultimately increases the running cost of the engine [1]. Moreover, sources for the fossil fuels are rapidly depleting owing to ever-rising demand, and due to geological restrictions of fossil extraction, its production from the sources over the world would start to fall-off from 2030. Further, the exhaust emission from combustion of petrol
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