Residual Gases

Residual Gases

 

the gases that remain in the cylinder of an internal-combustion engine after the exhaust stroke has been completed. Residual gases contain combustion products and nitrogen. Before combining with the incoming fuel-air mixture, residual gases have a temperature between 700° and 800°C. They constitute from 8 to 15 percent of the weight of fresh charge in the cylinder. The contents of cylinders in an idling engine have the maximum possible proportion of residual gases—25 percent. For every percent of weight of the mixture of fresh charge and residual gases that is contributed by the residual gases, the air-fuel mixture is warmed by 8° to 10°C. As compression in the cylinder increases, both the absolute and relative amounts of residual gases in the cylinder decrease.

References in periodicals archive ?
For 60 years inland vessels have been discharging residual gases such as benzene while sailing.
An additional factor that affects knock intensity is the concentration of residual gases in the combustion chamber, which can be partly regulated by adjusting the back-pressure and valve settings [23].
Residual gases, such as methane and ethane, are used by domestic
Residual gases, such as methane and ethane, are used by domestic industry and for power production, he said.
They were one of the first to suggest that active radicals in residual gases could play an important role in the autoignition process.
Long considered a tradeoff for the higher resolution, higher brightness and smaller energy spread of a cold FEG TEM, emission stability degrades because of residual gases in the area of the tip.
-7 Internal moisture content measurement and the analysis of other residual gases.
The residual gases being used as a chemical plant feedstock.
The AJAX LE engine-scavenging process removes the residual gases from the previous cycle out of the power cylinder, pushing these gases into the exhaust pipe.
(Never cut open any tank unless it is empty and has been completely filled with water to displace all residual gases.) If you can only find a thin wall tank, it will work as well, you just won't get the kind of life a 1/4" tank will ofter.
The observation was striking and led to numerical simulations of isochoric cooling that show that the composition of the residual gases in the vessel remains frozen to a temperature as high as 1650[degrees]K after hours of standing at the final room temperature.
In the drydown zone, arbitrarily set at an upper limit of [10.sup.-30] torr, the specific gas that dominates the residual gases is water vapor desorbing from the chamber's internal surfaces and diffusion from within the bulk of hygroscopic materials.