Numerical and experimental investigation of the flow structure in a diesel engine with different piston bowl structure

Year 2022, Volume: 6 Issue: 3, 233 - 241, 03.10.2022

İlker Temizer , Ömer Cihan

https://doi.org/10.30939/ijastech..1111073

Cited By: 1

Abstract

In this study, unfired (cold) flow application was investigated in a single cylinder die-sel engine with different combustion chamber geometries. In the experimental study, images obtained with the help of an endoscopic camera for different cycle points were instantly detected at constant speed. At the same time, velocity distributions of two dif-ferent combustion chambers for different crank angles were analyzed in Ansys Forte software at before and after TDC. Thus, the flow distributions of different combustion chamber geometries in the chamber were compared. It can be said that regional swirl is formed in the newly developed combustion chamber geometry and develop in the chamber rather than the piston base compared to the standard combustion chamber. In addition, especially during the compression process, the squish movement of the bowl was observed with the movement of the piston. Here, it could be said that the newly de-veloped chamber geometry is more effective than the standard bowl geometry. When the distribution of velocity vectors in the x-y and x-z axis were examined in numerical analysis, especially in the TDC position, it was determined that the interaction of the flow developed by the new bowl geometry with the fuel droplets was more evident. While it is seen that the vector velocity changes are close to each other at the 6920 CA before the fuel injection, it is seen that higher flow velocities are formed for the standard combustion chamber at the 7200 CA where the spraying continues and develops.

Keywords

Piston bowl structure, cold flow, swirl/squish moves, velocity distribution

Supporting Institution

TUBİTAK

Project Number

120M143

Thanks

This research was supported by the Scientific and Technological Research Council of Turkey –TUBITAK Project No: 120M143

References

• Referans1 J. B. Heywood, Internal Combustion Engine (ICE) Fundamentals. 1988.
• Referans2 C. Soruşbay, M. Ergeneman, A. İmren, and A. T. Çalık, ‘Experimental and Numerical Air Flow and Spray Dynamics Investigation in Internal Combustion Engines’, Istanbul, 2008.
• Referans3 A. Jamil, M. B. Baharom, and A. R. A. Aziz, ‘IC engine in-cylinder cold-flow analysis – A critical review’, Alexandria Eng. J., vol. 60, no. 3, pp. 2921–2945, 2021, doi: https://doi.org/10.1016/j.aej.2021.01.040.
• Referans4 A. K. Azad, P. Halder, K. Nanthagopal, and B. Ashok, Investigation of diesel engine in cylinder flow phenomena using CFD cold flow simulation. Elsevier Ltd, 2019.
• Referans5 S. Wei, F. Wang, X. Leng, X. Liu, and K. Ji, ‘Numerical analysis on the effect of swirl ratios on swirl chamber combustion system of di diesel engines’, Energy Convers. Manag., vol. 75, pp. 184–190, 2013, doi: 10.1016/j.enconman.2013.05.044.
• Referans6 N. A. M. Shafie and M. F. M. Said, ‘Cold flow analysis on internal combustion engine with different piston bowl configurations’, J. Eng. Sci. Technol., vol. 12, no. 4, pp. 1048–1066, 2017.
• Referans7 B. Bibu and V. Rajan, Numerical simulation of cold flow analysis of internal combustion engine with double-lobed piston head. Springer Singapore, 2019.
• Referans8 H. Sushma and K. B. Jagadeesha, ‘CFD modeling of the in-cylinder flow in direct-injection Diesel engines’, Int. J. Sci. Res. Publ., vol. 3, no. 12, pp. 995–1021, 2013, doi: 10.1016/j.compfluid.2003.09.003.
• Referans 9 A. R. Gnana Sagaya Raj, J. M. Mallikarjuna, and V. Ganesan, ‘Energy efficient piston configuration for effective air motion - A CFD study’, Appl. Energy, vol. 102, pp. 347–354, 2013, doi: 10.1016/j.apenergy.2012.07.022.
• Referans10 B. Somerville, ‘A study of air motion and combustion in the DI Diesel engine’, 1993.
• Referans11 G. R. French and W. M. Scott, ‘Giving the IDI diesel a fresh start’, SAE Tech. Pap., vol. 850452, pp. 1–12, 1985, doi: 10.4271/850452.
• Referans12 J. Rabault, J. A. Vernet, B. Lindgren, and P. H. Alfredsson, ‘A study using PIV of the intake flow in a diesel engine cylinder’, Int. J. Heat Fluid Flow, vol. 62, pp.1–17, 2016, doi: 10.1016/j.ijheatfluidflow.2016.06.020.
• Referans13 P. Janas, I. Wlokas, B. Böhm, and A. Kempf, ‘On the evolution of the flow field in a spark ignition engine’, Flow, Turbul. Combust., vol. 98, no. 1, pp. 237–264, 2017, doi: 10.1007/s10494-016-9744-3.
• Referans14 V. Granet, O. Vermorel, C. Lacour, B. Enaux, V. Dugué, and T. Poinsot, ‘Large-Eddy simulation and experimental study of cycle-to-cycle variations of stable and unstable operating points in a spark ignition engine’, Combust. Flame, vol. 159, no. 4, pp. 1562–1575, 2012, doi: 10.1016/j.combustflame.2011.11.018.
• Referans15 M. Bakenhus and R. D. Reitz, ‘Two-color combustion visualization of single and split injections in a single-cylinder heavy-duty D.I. diesel engine using an endoscope-based imaging system’, SAE Tech. Pap., vol. 1999-01–11, pp. 1–18, 1999, doi: 10.4271/1999-01-1112.
• Referans16 A. Manoj Babu, C. G. Saravanan, M. Vikneswaran, V. Edwin Jeo, and J. Sasikala, ‘Visualization of in-cylinder combustion using endoscope in spark ignition engine fueled with pine oil blended gasoline’, Fuel, vol. 263, pp. 1–9, 2020, doi: 10.1016/j.fuel.2019.116707.
• Referans17 B. M. Krishna and J. M. Mallikarjuna, ‘Effect of engine speed on in-cylinder tumble flows in a motored internal combustion engine - An experimental investigation using particle image velocimetry’, J. Appl. Fluid Mech., vol. 4, no. 1, pp. 1–14, 2011, doi: 10.36884/jafm.4.01.11895.
• Referans18 B. Murali Krishna, A. Bijucherian, and J. M. Mallikarjuna, ‘Effect of intake manifold inclination on intake valve flow characteristics of a single cylinder engine using particle image velocimetry’, World Acad. Sci. Eng. Technol., vol. 68, pp. 176–182, 2010.
• Referans19 E. Ayaz, H. Köten, and S. Çadırcı, ‘Ağır iş dizel motoru silindiri içerisindeki soğuk hava akışının sayısal incelenmesi’, Marmara Fen Bilim. Derg., vol. 4, pp. 445–452, 2018, doi: 10.7240/marufbd.424411.
• Referans 20 D. Liu, X. Li, H. Shang, L. Xie, Y. Chen, and J. Chang, ‘Combustion performance and fuel injection timing adaptability of a lateral swirl combustion system for direct injection diesel engines’, Fuel, vol. 286, pp. 1–15, 2021, doi: 10.1016/j.fuel.2021.120663.
• Referans 21 İ.Temizer, Ö.Cihan, B.Eskici, 'Numerical and experimental investigation of the effect of biodiesel/diesel fuel on combustion characteristics in CI engine', Fuel, vol. 270, pp.1-9, 2020, doi: 10.1016/j.fuel.2020.117523.