Double lobed mixer for turbofan engine

摘要

A lobed mixer (7) has major and minor lobes (8,9). The major lobes increase in both height and width in the downstream axial direction. Each major lobe (8) has two minor lobes (9) positioned on its radially outer surface located downstream of the beginning of the major lobe. The radial depth of the minor lobes increases with downstream axial distance but is never greater than the depth of the major lobes. Each of the chutes (11) formed between the minor lobes introduces an additional stream of cold, low velocity fan flow into the hot, high velocity core flow to improve the uniformity of mixing. The double lobed mixer decreases acoustic intensity while having little or no effect on engine performance.