A comparison of diffuse back-illumination (DBI) and Mie-scattering technique for measuring the liquid length of severely flashing spray

Abstract

A quantitative measure of the liquid penetration length of a directly-injected (DI) fuel spray is one of the important parameters for engine designers and computational spray model development and validation. Spray liquid length gives an indication of important behaviour such as fuel-air mixing or liquid-phase fuel impingement on the piston bowl and cylinder walls. Multiple techniques have been developed to study liquid penetration length, however the uncertainties associated with these methods have not been exhaustively explored for multi-hole injectors with flash-boiling sprays. This work compares two measurement techniques for measuring liquid penetration length of highly flashing sprays ..