Direct numerical simulation of a tip-leakage vortex model in a planar duct with a longitudinal slit

Fang, Jian; Gao, Yangwei; Yao, Yufeng; Liu, Yangwei; Lu, Lipeng

Abstract

A computational model of a planar duct with a cross flow injected from a longitudinal slit on the top of the duct is developed to study the tip-leakage vortex (TLV) which is one of the most important flow phenomena within the rotor of turbomachinery. The study is carried out with direct numerical simulation (DNS) approach by using a high-order compressible solver: ASTR. TLV is formed primarily due to the interactions of wall jet and mainstream flow and the breakup of its structures are captured by DNS. The SST k-w turbulence model is tested and results obtained are assessed for both the TLV model and the rotor of a low pressure compressor. It was found that the RANS model presents very similar loss performances in the TLV model flow and the real rotor configuration, indicating that the present DNS data could be employed to further calibrate and improve RANS models targeting TLVs.

• Presentation Conference Type: Poster
• Conference Name: UKTC Annual Review
• Start Date: Sep 4, 2017
• End Date: Sep 5, 2017
• Acceptance Date: Sep 4, 2017
• Publicly Available Date: Jun 7, 2019
• Peer Reviewed: Not Peer Reviewed
• Keywords: direct numerical simulation, tip-leakage, vortex model, planar duct, longitudinal slit
• Public URL: https://uwe-repository.worktribe.com/output/881576
• Additional Information: Title of Conference or Conference Proceedings : UKTC Annual Review