{"title":"Tumble Flow Analysis in an Unfired Engine Using Particle Image Velocimetry","authors":"B. Murali Krishna, J. M. Mallikarjuna","country":null,"institution":"","volume":30,"journal":"International Journal of Mechanical and Mechatronics Engineering","pagesStart":706,"pagesEnd":712,"ISSN":"1307-6892","URL":"https:\/\/publications.waset.org\/pdf\/8168","abstract":"This paper deals with the experimental investigations\r\nof the in-cylinder tumble flows in an unfired internal combustion\r\nengine with a flat piston at the engine speeds ranging from 400 to\r\n1000 rev\/min., and also with the dome and dome-cavity pistons at an\r\nengine speed of 1000 rev\/min., using particle image velocimetry.\r\nFrom the two-dimensional in-cylinder flow measurements, tumble\r\nflow analysis is carried out in the combustion space on a vertical\r\nplane passing through cylinder axis. To analyze the tumble flows,\r\nensemble average velocity vectors are used and to characterize it,\r\ntumble ratio is estimated. From the results, generally, we have found\r\nthat tumble ratio varies mainly with crank angle position. Also, at the\r\nend of compression stroke, average turbulent kinetic energy is more\r\nat higher engine speeds. We have also found that, at 330 crank angle\r\nposition, flat piston shows an improvement of about 85 and 23% in\r\ntumble ratio, and about 24 and 2.5% in average turbulent kinetic\r\nenergy compared to dome and dome-cavity pistons respectively","references":null,"publisher":"World Academy of Science, Engineering and Technology","index":"Open Science Index 30, 2009"}