Análisis sobre las características hidráulicas y de empuje de una bomba a propulsión por agua en miniatura
Keywords:
Water-jet propulsion pump, Hydraulic and thrust characteristics, Pressure coefficient.Abstract
Abstract
Water-jet propulsion pump produces an action force by the
flow of water at the outlet that is under a free water state when
it does not suffer from constraints resulting from a pipeline or
valve error, its thrust characteristics are also influenced by water
flow characteristics. The calculation and experiment models of the hydraulic and thrust characteristics of a miniature water-jet propulsion pump were proposed in this study in order to determine
the relationships between the hydraulic and thrust characteristics
of the water-jet propulsion pump. We established the hydraulic
calculation model by using the velocity coefficient method and
thrust prediction, whereas the experiment model under open state was established by combining the working characteristics of
the water-jet propulsion pump. The pressure coefficient at the
outlet of the water-jet propulsion pump, velocity distribution at
the outlet section, thrust characteristics under different revolution speeds, and the dynamic characteristics of different distances
from nozzle to pool bottom were studied based on fluid dynamics
and momentum theorem, after which model accuracy was verified
through the experiment. Results show that the flow of the miniature water-jet propulsion pump presents a linear relationship with
elevated pump revolution speed, and that the area of axial velocity
being smaller than or equal to −1.5 m/s has positive correlations
with both the revolution speed and the distance from nozzle to
pool bottom. Results also indicated that the thrust of the miniature water-jet propulsion pump is influenced by the distance from
the nozzle to the bottom: when the distance is greater than 0.8 m,
the experiment pool does not influence the thrust of the waterjet propulsion pump. This research results are of great significance
in establishing a experiment stand of a miniature water-jet propulsion pump and its performance evaluation..
