Abstract
Recently, as global-scale problems, such as global warming and energy depletion, have attracted attention, the importance
of future environmental preservation has been emphasized worldwide, and various measures have been proposed and
implemented. This study focuses on water hammer pumps that can effectively use the water hammer phenomenon and
allow fluid transport without drive sources, such as electric motors. An understanding of operating conditions on water
hammer pumps and an evaluation of their basic hydrodynamic characteristics are significant for determining whether they
can be widely used as an energy-saving device in the future. However, conventional studies have not described the pump
performance in terms of pump head and flow rate, common measures indicating the performance of pumps. As a first stage
for the understanding of water hammer pump performance in comparison to the characteristics of typical turbo pumps, previous
study focused on understanding the basic hydrodynamic characteristics of water hammer pumps and experimentally
examines how the hydrodynamic characteristics are affected by the inner diameter of the drive and lifting pipes and the
angle of the drive pipe. This paper proposes the effect of air volume in air chamber that affects the hydrodynamic characteristics
and operation conditions of the water hammer pump.
