“…Enhancement of this regular breakdown process by passive means, which is the subject of this paper, has also been studied using noncircular jets. For example, the elliptical cross-section, initially studied in nonreacting experiments (Sforza et al 1966, Trentacoste & Sforza 1967, Gutmark & Ho 1982, and Husain & Hussain 1983, was used to enhance fine-scale mixing and combustion of fuelrich, gas-generator reaction products . The improvements were due to the complex dynamics of the elliptical vortices (Dhanak & Debernardinis 1981).…”