Laminar Flow Reactor

The laminar flow reactor (LFR) is used for the detailed chemical kinetic investigation of the low temperature auto-ignition chemistry of premixed air/fuel mixtures of diesel-like gaseous and liquid fuels at atmospheric pressure. It is applied to measure first stage ignition delay times and stable intermediate species of the low temperature combustion process with GC/MS.

In order to obtain a uniform and controlled temperature, the LFR is placed within an approximately isothermal oven. It consists of a number of flanged pipe segments made of stainless steel with an inner diameter of 20 mm and a wall thickness of 2.5 mm. The overall length of the LFR is 5.8 m. The fuel injection into the air flow is performed using a specially designed injector which is placed within the main pipe at a distance of 0.15 m from the inlet. The oncoming oxidizer and fuel streams are heated to the same temperature as the oven and the reactor tube located therein. The vaporized or gaseous fuel is rapidly mixed with the air at the beginning of the reactor (tign > 20*tmix). Temperature profiles along the LFR are recorded and used for the detection of the ignition location. Together with the inlet flow rates, they are used to obtain the first stage ignition delay times. The heat loss of the gas mixture after the first stage of ignition leads to a freezing of the chemical reactions which enables the evaluation of intermediate species in the exhaust gas.

Experimental Set-up Laminar Flow Reactor


Alena Sudholt