전산유체역학을 이용한 선박용 연료분사노즐의 형상에 따른 유동 특성 분석

Abstract

There are no domestic companies that design a fuel injection nozzle due to lack of technical facilities, even though it is a very important part affecting on combustion in diesel engine. Design of fuel injection nozzle was carried out by computing flow rate using Ansys FLUENT R15.0 about the fuel injection nozzle designed by a domestic company with test conditions at 100 bar of inlet pressure and 40℃ of fuel temperature. Object models were standard sac and mini sac of fuel injection nozzles. Fuel injection nozzle’s flow results showed dynamical difference by its geometrical characteristics. The main purpose of this study is to identify which sac geometry of fuel injection nozzle shows better performance, and to improve a domestic company’s individual design skills. In other words, results were discriminated in order to enhance the design ability of domestic company on fuel injection nozzle. As result, standard sac was 0.208L/min larger than mini sac nozzle in flow rate. The differential rate between flow analysis and the test result is from 1% to 3.3%. It is needed for the validity of flow analysis of fuel injection nozzle compared with experiments. This study is to be carried out to the field of fuel spray characteristics and atomization in combustion chamber of diesel engine later on.