Preprint Article Version 1 This version is not peer-reviewed

Influence of Core Swirling Motion on Aerodynamic Performances of Lobed Exhaust Nozzle

Version 1 : Received: 18 November 2019 / Approved: 19 November 2019 / Online: 19 November 2019 (03:03:48 CET)

How to cite: Ding, Y.; Liu, Y.; Du, L. Influence of Core Swirling Motion on Aerodynamic Performances of Lobed Exhaust Nozzle. Preprints 2019, 2019110217 (doi: 10.20944/preprints201911.0217.v1). Ding, Y.; Liu, Y.; Du, L. Influence of Core Swirling Motion on Aerodynamic Performances of Lobed Exhaust Nozzle. Preprints 2019, 2019110217 (doi: 10.20944/preprints201911.0217.v1).

Abstract

Influence of core flow inlet swirl angle on aerodynamic performances of an exhaust nozzle with scarfed lobed mixer was studied by the validated computational approach. The computational simulation was conducted by resolving the steady form of discretized three-dimensional Reynolds Averaged Navier-Stokes equations with the shear stress transport k-Ω turbulence model. Simulation results depict that swirling motions have ignorable influence on the flow field of the top part in the cross sections slightly downstream of the lobed trailing edge. Besides, for the flow field downstream of the L/D=0.1 cross section, the swirling motions are suggested to cause the clockwise stream-wise vortex to stretch into several smaller-scale vortexes. When the case with a bigger swirling angle is investigated, the induced smaller-scale vortexes are more strengthened by the swirling motions. Concerning the 15° swirling case, the loss caused by the destroyed vortex pattern and the benefit induced by the improved smaller-scale vortexes almost counteract with each other with respect to the thermal mixing efficiency. In the last studied cross section as compared with the baseline case, the case with a maximum swirling angle of 30° has increased 6.94% for the thermal mixing efficiency and decreased 0.42% for the total pressure recovery coefficient.

Subject Areas

swirling flow; lobed nozzle; stream-wise vortex; mixing efficiency; total pressure loss

Comments (0)

We encourage comments and feedback from a broad range of readers. See criteria for comments and our diversity statement.

Leave a public comment
Send a private comment to the author(s)
Views 0
Downloads 0
Comments 0
Metrics 0


×
Alerts
Notify me about updates to this article or when a peer-reviewed version is published.