Progress in Computational Fluid Dynamics, Vol. 19, No. 2, 2019 123 Copyright © 2019 Inderscience Enterprises Ltd. Computational and experimental study of swirl flow within SI engine with modified shrouded intake valve Bidesh Roy* Department of Mechanical Engineering, National Institute of Technology Mizoram, Aizawl, Pin-796012, India Email: bidesh.999@gmail.com *Corresponding author Rahul Dev Misra and Krishna Murari Pandey Department of Mechanical Engineering, National Institute of Technology Silchar, Assam, Pin-788010, India Email: rdmisra@gmail.com Email: kmpandey@mech.nits.ac.in Abhijit Sinha and Bachu Deb Department of Mechanical Engineering, National Institute of Technology Mizoram, Aizawl, Pin-796012, India Email: abhinit05@gmail.com Email: bdebnitmz@gmail.com Abstract: Swirling flow can be used in a spark-ignition engine to increase turbulence intensity of the working fluid in the engine by using a shrouded intake valve. However, on using shrouded intake valve, a greater restriction to the incoming fluid is offered. In this backdrop, a computational and experimental study of swirl flow within the spark-ignition engine with a modified shrouded intake valve has been carried out and the same is then compared with 100°, 120° and 180° shrouded intake valves. The results show that the fluid flow patterns generated by the intake valves within the engine cylinder are similar in nature. The engine with the modified shrouded intake valve generates a substantial amount of swirl with comparatively lesser restriction to the incoming fluid. Whereas, the engine using other types of intake valves, either generates higher swirl ratio with lower mean flow coefficient or lower swirl ratio with higher mean flow coefficient. Keywords: computational fluid dynamics; CFD; mean flow coefficient; modified shrouded intake valve; spark ignition engine; steady flow test; swirl ratio. Reference to this paper should be made as follows: Roy, B., Misra, R.D., Pandey, K.M., Sinha, A. and Deb, B. (2019) ‘Computational and experimental study of swirl flow within SI engine with modified shrouded intake valve’, Progress in Computational Fluid Dynamics, Vol. 19, No. 2, pp.123–136. Biographical notes: Bidesh Roy received his PhD in 2016 from the National Institute of Technology Silchar, Assam, India and he completed his MTech in Thermal Engineering in 2010 from the same institute. His areas of research interests are internal combustion engine, CFD, energy management and thermodynamic. Currently, he is working as an Assistant Professor in the Department of Mechanical Engineering at the NIT Mizoram, Aizawl, India. Rahul Dev Misra is working as a Professor in the Department of Mechanical Engineering at NIT Silchar, Assam, India. His areas of research interests include internal combustion engine, biofuel research, thermo-economics, exergy analysis of thermal systems and refrigeration and air-conditioning. He earned his MTech in Energy Studies from the IIT Delhi and his PhD from the IIT Roorkee. He has about 20 numbers of publications in international journals and more than 30 papers in national and international conferences. Krishna Murari Pandey earned his PhD in Mechanical Engineering in 1994 from the IIT Kanpur. He has published and presented more than 200 papers in international and national conferences and journals. Currently, he is working as a Professor in the Department of Mechanical Engineering at the NIT Silchar, Assam, India. His areas of research interests are combustion, high-speed flows and numerical simulations in CFD area from commercial software.