Spark ignition engines, compression ignition engines and gas turbines are used as power trains. It is expected for engines to improve their efficiency and minimize their exhaust emissions for protecting the global environment and saving the fossil fuels. Laser diagnostic techniques are key technologies to improve or develop the engines.
There was over 40 years history from the first development of laser velocimetry and many reports were presented at each “International Symposium on Applications of Laser Techniques to Fluid Mechanics” held at Lisbon in every other year. Here, some newly developed velocity measuring techniques, LDA/LDV, PDA, DGV, L2F, PIV and MTV are reviewed to analyze combustion, gas flow in the cylinder and mixture formation.
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