THERMAL SCIENCE

International Scientific Journal

Bo Wang

,

Long-Xi Zheng

,

Jie Lu

,

Yu-Dong Yang

,

Dao-En Zhou

NUMERICAL ANALYSIS OF FLOW MECHANISM BETWEEN SEALING FLOW AND MAINSTREAM EXHAUSTED FROM PULSE DETONATION COMBUSTOR

ABSTRACT
A conventional axial turbine drived by a pulse detonation combustor heavily challenges the turbine cooling and hot gas sealing. In order to fully understand the physical behavior of ingress and egress effect with the pulse inlet mainstream, a study is carried out to investigate the unsteady flow field and sealing efficiency inside the cavity using the method of unsteady, 3-D CFD simulation. The pulse detonation inflow boundary condition simplified using simple exponential decay formulas are applied to the inlet of mainstream passage. The results reveal that the magnitude of sealing gas pressure does affect the pressure and sealing efficiency distribution inside cavity. The sealing efficiency inside the cavity goes through three sub-stages, respectively, “the decline stage”, “the plateau stage“, and “the recovery stage“. when the sealing gas pressure increases, the sealing efficiency of these three sub-stages will increase, and the duration of “ the plateau stage “ and “the recovery stage“ will decrease. As a result, the ability of turbine cavity that resist the ingress of pulse detonation inflow can be augmented with the sealing gas pressure increases.
KEYWORDS
numerical simulation, pulse detonation combustion, turbine cavity, pressure coefficient, sealing efficiency
PAPER SUBMITTED: 2023-10-14
PAPER REVISED: 2023-12-10
PAPER ACCEPTED: 2024-02-03
PUBLISHED ONLINE: 2024-05-18
DOI REFERENCE: https://doi.org/10.2298/TSCI231014108W
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2024, VOLUME 28, ISSUE Issue 5, PAGES [3877 - 3891]
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Numerical analysis of flow mechanism between sealing flow and mainstream exhausted from pulse detonation combustor

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence