Community Research and Development Information Service - CORDIS

A further development of supercritical injection for better fuel atomization and lower combustion emissions

The technology proposed is dedicated to a new concept of an atomization method known as fuel supercritical injection. Flashing of a substance during supercritical injection is possible with or without dissolved gas in the fuel. A concept of the supercritical injection based on flashing of a gas-dissolved preliminary in the fuel is presented in US Patent 4189914. Injection of the fuel containing dissolved gas results in gas-fuel two-phase flow with expanding bubbles in a nozzle outlet orifice. Although bubbles expansion augments atomization process supercritical injection basic concept has not been applied in practice.

Creation of bubble flow of a particular design is decisive precondition of the new concept. Two atomization work mechanisms must be possible leading to different versions of the new concept. Either of the versions that are the main approaches of the proposed research leads to faster fuel vaporization.

Calculations made by use of a theoretical model suitable for one of the two versions show that atomization energy released after employing the supercritical injections new concept could be at least 2 or 3 times higher than those obtained by employing other technologies e.g. air-assisted or pressure atomization at even conditions.

Anticipated benefits are lower soot, NOx and CH emissions due to faster fuel vaporization, even fuel distribution in the combustion space and more complete combustion process at lean mixture conditions. The technology is easy to be demonstrated in case of continuous sprays employed for example in gas-turbine combustors for industrial or aircraft applications.

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