Cryogenic fuel management on the precooled turbo jet engine

Masamitsu Watanabe*, Hitomi Iizuka, Takato Goto, Ayumu Hirayama, Tetsuya Sato, Hiroaki Kobayashi, Hideyuki Taguchi, Kenya Harada

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Japan Aerospace Exploration Agency (JAXA) is currently developing the pre-cooled turbo jet engine (PCTJ) for hypersonic flight. This engine features air pre-cooling using liquid hydrogen fuel in advance of the compression. The cryogenic hydrogen fuel changes drastically in density when it evaporates while passing the fuel tubing at the engine start-up. Presently, the inadequacy of the physical property data of two-phase hydrogen flow pertaining to evaporation hinders the construction of the fuel flow simulator required in establishing high accuracy fuel flow control. In the present study, a device for the void fraction measurement is developed, that is a key parameter of the characteristics of the two-phase flow. It uses the difference of the electric permittivity between the liquid and gas. Validation tests comparing with the optical method were conducted by oil/air, nitrogen and hydrogen. The electrical heater produces various evaporation modes such as bubbly flow, slug flow and churn flow. The void fraction meter could successfully acquire the physical property even in a cryogenic condition. We also measured the heat transfer coefficient of the cryogenic two phase flow. The data of the nitrogen flow arranged by well-known Lockhart-Martinelli parameter shows the agreement with the analytical value.

Original languageEnglish
Title of host publication62nd International Astronautical Congress 2011, IAC 2011
Number of pages8
Publication statusPublished - 2011 Dec 1
Event62nd International Astronautical Congress 2011, IAC 2011 - Cape Town, South Africa
Duration: 2011 Oct 32011 Oct 7

Publication series

Name62nd International Astronautical Congress 2011, IAC 2011


Conference62nd International Astronautical Congress 2011, IAC 2011
Country/TerritorySouth Africa
CityCape Town

ASJC Scopus subject areas

  • Aerospace Engineering


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