The purpose of this study is to analyse numerically and experimentally the effects of lip thickness (LT) and bypass ratio on co-flowing nozzle under subsonic and correctly expanded sonic jet decay at different Mach numbers.
Co-flowing jets from co-flowing nozzles of different LTs, 0.2, 1 and 1.5 Dp (where Dp is the primary nozzle exit diameter = 10 mm), with an annular gap of 10 mm at main jet exit Mach numbers 0.6 have been studied experimentally and the other cases have been performed numerically. The co-flowing jet with 2 mm LT was used for comparison.
Co-flowing jet axial pitot pressure decay, axial static pressure decay, axial velocity decay, radial velocity decay and streamline velocity contours were analyzed. The results illustrate that the mixing of the co-flowing jet with profound LT is prevalent to the co-flowing jet with 2 mm LT, at all Mach numbers of the current study. Also, the LT of the co-flowing jet has a strong impact on jet mixing. Co-flowing jets with 10 mm and 15 mm LT with a constant co-flow width of 10 mm experience a considerably advanced mixing than co-flowing jets with 2 mm LT and a co-flow width of 10 mm.
The application of bypassed co-flow jet is in turbofan engine operates efficiently in modern civil aircraft.
All subsonic jets are considered correctly expanded with negligible variation in axial static pressure. However, in the present study, static pressure along the centerline varies sinusoidally up to 9% and 12% above and below atmospheric pressure, respectively, for primary jet exit Mach number 1.0. The sinusoidal variation is less for primary jet exit Mach numbers 0.6 and 0.8 in static pressure decay.
Lip thickness effect on high bypass co-flowing jet mixing
Aircraft Engineering and Aerospace Technology ; 94 , 10 ; 1614-1627
2022-04-20
1 pages
Article (Journal)
Electronic Resource
English
Characteristics of a co-flowing jet with varying lip thickness and constant bypass ratio
Emerald Group Publishing | 2019
|SAGE Publications | 2019
|FULL-LENGTH PAPERS - Optimum Mixing of Core and Bypass Streams in High-Bypass Civil Turbofan
Online Contents | 2002
|