Flow and thermal performance of supercritical n-decane in double-layer channels for regenerative cooling of a scramjet combustor

Research output: Contribution to journalArticle

Abstract

In order to improve the active regenerative cooling performance of a scramjet using supercritical n-decane, a new type of cooling channel, the double-layer channel, is proposed. Based on reliable numerical simulations, temperature profiles, fluid flow track, vortex structure and buoyancy force distribution of three cases are presented, respectively. It is found that the heat transfer performance of the double-layer channel with the same flow direction is better than the other cases and the heat transfer deterioration (HTD) phenomenon is effectively weakened and the wall temperature is greatly reduced. A cross-flow and a large vortex structure induced by the buoyancy forces are helpful to the occurrence of the HTD phenomenon. An “M” type temperature profile and an “M” type buoyancy force distribution are important characteristics of the HTD phenomenon.

Details

Authors
Organisations
External organisations
  • Northwestern Polytechnic University
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Fluid Mechanics and Acoustics

Keywords

  • Buoyancy force, Cross-flow, Double-layer channel, Heat transfer deterioration, Supercritical n-decane, Vortex structure
Original languageEnglish
Article number115695
JournalApplied Thermal Engineering
Volume180
Publication statusPublished - 2020
Publication categoryResearch
Peer-reviewedYes