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Abstract: With increasing awareness of environment protection, more
and more scholars fix their attention on the natural fish damage caused
by hydraulic machinery. The gas access system composed of a pressure
vessel, a vacuum pump and an air compressor is used to simulate the
pressure changing courses in hydraulic machinery, and the digital signal
system composed of a pressure sensor, an amplifier, an A/D card and a
computer is used to get the pressure-time data. After each group of
experiment, fishes injured by pressure gradient are checked and
anatomized carefully. In present studies, it is demonstrated that fishes
are severely injured under different pressure gradients during
subatmospheric conditions, and the maximum pressure gradient safe for
fishes passing through hydraulic machinery is concluded, which can
provide reference databases for the design of new environmentally
friendly hydraulic machinery.
Key words: Hydraulic machinery Pressure gradient Subatomospheric
condition Fish damage Simulating experiment
CLC No: TK7 Q959.4
清华大学基础研究985基金资助项目(JC2000016).
Received 20011114, received in revised form 20020328
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