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Second Thermal and Fluids Engineering  Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

Experimental investigation of biomimetic self-pumping transpiration cooling

Gan Huang
Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Tsinghua University, 10084 Beijing, People's Republic of China

Yin-hai Zhu
Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Thermal Engineering, Tsinghua University, Beijing 100084, China

Zhiyuan Liao
Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Tsinghua University, 10084 Beijing, People's Republic of China

Taojie Lu
Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Tsinghua University, 10084 Beijing, People's Republic of China

Pei-Xue Jiang
Beijing Key Laboratory for CO2 Utilization and Reduction Technology Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Department of Thermal Engineering, Tsinghua University, Beijing 100084, China

Abstract

Transpiration cooling is considered to be one of the most effective cooling methods to protect components from ablation in extremely high temperature environments. The pumps of the transpiration cooling systems make the system complex and the load increase. Trees in nature successfully pump the water from soil to leaves without any pumps. This study describes a biomimetic self-pumping transpiration cooling method inspired by the process of trees transpiration. A self-pumping transpiration cooling system was designed and experimentally investigated. The influences of heat fluxes on biomimetic self-pumping transpiration cooling efficiency were investigated. The experimental results showed that the water was successfully pumped from the water tank into the hot surface and the surface temperature was about 373 K when the flame heat flux was 0.42 MW/m2. The water mass flow rate intelligently increased with increasing the flame heat flux onto the hot surface and the surface temperature stayed around 373 K. A protective steam layer was observed by the schlieren system which blocked the flame heat flux onto the hot surface.

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