EFFECT OF COMBUSTION CHAMBER FORM ON THE TENDENCY OF A CARBURETOR ENGINE TOWARD DETONATION.
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
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CONCLUSIONS The form of the combustion chamber and the magnitude of the displacer has a great effect on the detonation tendency of the engine. A 40 increase of the displacer from the area of the ring shows positive results of engine operation, considerably reducing its detonation tendency and increasing the index of using the detonation stability of the fuel in the engine. An increase in displacer to 60, although it gives a reduction in requirements in octane number of the fuel, but it is accompanied by an undesirable increase in rigidity and working noise of the engine. The form of the combustion chamber and the magnitude of the displacer exert a great effect on the sensitivity of the engine towards changing the ignition advancement angle, and also on the power reduction and deterioration of fuel economy of the engine when using auto gasolines with octane number, smaller than the needed one. With an increase in displacer the sensitivity of the engine toward the deviation of the ignition advancement angle from its optimum value increases. The form of the combustion chamber considerably affects detonational rigidity of the engine, i.e. its ability to use the properties of sensitive automobile gasolines, to change its actual octane evaluation in dependence upon exploitation conditions. It can be especially recommended the use of sensitive auto gasolines for engines with wedge, cylindrical, semispherical and plane oval combustion chambers are especially recommended. Author
- Combustion and Ignition
- Reciprocating and Rotating Engines