Numerical investigation on the film cooling performance in a multi-elements splash platelet injector

Yin, Liang; Liu, Weiqiang; Shen, BinXian; Liu, Hongpeng

doi:10.1016/j.actaastro.2018.08.043

Cited by 6 publications

(2 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Supercritical pressure fluids are used as working fluids in many industrial applications, such as advanced nuclear reactors, transcritical CO 2 refrigeration system, platelet transpiration cooling methods and solar-thermal power stations (Mao et al 2021;Ehsan et al 2023). Advanced platelet transpiration cooling methods are intended to protect surfaces with significant thermal loads, such as walls in rocket thrust chambers at high operating temperatures (May & Burkhardt 1991;Yin & Liu 2018). Platelet cooling technology has been developed as a very flexible thermal management method by designing diffusion bonding together thin metal platelets which contain etched coolant passages.…”

Section: Introductionmentioning

confidence: 99%

“…2023). Advanced platelet transpiration cooling methods are intended to protect surfaces with significant thermal loads, such as walls in rocket thrust chambers at high operating temperatures (May & Burkhardt 1991; Yin & Liu 2018). Platelet cooling technology has been developed as a very flexible thermal management method by designing diffusion bonding together thin metal platelets which contain etched coolant passages.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Accelerating turbulence in heated micron tubes at supercritical pressure

Cao,

Xu,

et al. 2023

J. Fluid Mech.

View full text Add to dashboard Cite

The purpose of this research was to provide further understanding of turbulent dynamics and heat transfer mechanisms in accelerating flows with thermophysical variations and pressure drops in micron tubes. Direct numerical simulations were conducted to investigate the turbulence to supercritical pressure ${\rm CO}_2$ in heated micron tubes with inner diameter $99.2~\mathrm {\mu }$ m. In general, the turbulent heat transfer enhancement/deterioration at supercritical pressure is dominated by variations in thermophysical properties, buoyancy and thermal acceleration; however, the mechanism differs in micron tubes ( $d^* < 100\ \mathrm {\mu }$ m). The results showed that the pressure drop and scale effect made significant contributions to the development of turbulence flows heated at supercritical pressure in micron tubes, leading to the prominent property change and flow acceleration in the inlet fully developed turbulent flow. The deviation on temperature distribution because of pressure changes was non-negligible. The primary contribution of the acceleration was the decay of a boundary layer, which significantly suppressed the production of turbulence and decreased heat transfer. The acceleration had stabilizing effects on the ejection and sweep motions of the turbulent flow. The high-speed fluid contributed to a new disturbance scenario of the flow with a larger spanwise wavenumber superimposed on existing perturbations. The high-speed streak width in the quasilaminar region was approximately $150$ – $160\nu /u_\tau$ in accelerating flow. In the micron tubes, the Reynolds stress events of quadrant Q4 contributed 60 % of the Reynolds stress, greater than those of quadrant Q2.

show abstract