Effects of Water Injection and Increased Compression Ratio in a Gasoline Spark Ignition Engine Thesis uri icon

Overview

abstract

  • A single cylinder, four stroke, gasoline, spark ignition engine was modified to test the effects of water injection in combination with an increased compression ratio in a engine. Three air/fuel ratios (13.7, 14.7 and 15.7), six water/fuel mass ratios (from 0 to .75) and two different compression ratios (6:1 and 7:1) were tested. It was found that water injection in combination with an increased compression ratio can increase torque output (up to 65%), reduce brake specific fuel consumption (up to 39%), lower exhaust temperature (up to 10%), lower BSNO emissions (by up to 78%) and lower BSCO emissions (by up to78%) but may increase BSHC emissions (up to 45%).

publication date

  • January 1, 2011

Research

keywords

  • spark ignition engines; mechanical engineering; water injection; engines; engineering