A high pressure chamber development for the investigation of spray characteristics

Abstract

The development of spray characteristics concepts and a correct understanding of the processes inside the combustion chamber require an efficient investigation and improvement of the applied systems. Especially for smaller sizes of engines, a system is necessary which allows a fast adaptation to the desired parameters and an efficient conduction of the experiments. A high pressure chamber (HPC) has been designed to comply with the optical measurement techniques in spray characteristics studies at elevated pressures. For this purpose, a HPC in a 1:1 scale for small-bore engines (piston displacement approximately 76 mm) with a variable optical access (6 windows) has been developed based on a Compression Natural Gas-Direct Injection (CNG-DI) engine, using gasoline-ethanol as fuel. HPC designed is a versatile tool and includes the features of a well-defined core region, fast pressurize, ability to vary pressure and clearance, highly repeatable experimental conditions, optical accessibility, and capability for droplets measurement.