Abstract
Experiments injecting liquid nitrogen into the water jet, which focused on their differences between both of boiling temperatures, were carried out to improve the thrust from nozzle water flow. Effects of jet acceleration were evaluated by means of the measurements of thrust loads added on the convergent-divergent nozzle connecting with or without the parallel pipe submerged into the water tank. The characteristics of liquid-vapor two-phase nozzle flow appeared to be somewhat compressible fluid because of the explosive vaporization of liquid nitrogen, so that considerable increment of water acceleration at the part of divergent region of nozzle resulted in apparently higher thrust by exhaust jet from the nozzle.
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