Актуальные научные исследования в современном мире iscience. In. Ua

«MODERN SCIENTIFIC CHALLENGES AND TRENDS»
 
SCIENCECENTRUM.PL 
ISSUE 3 
ISBN 978-83-949403-3-1 
205
The study solved the problem of numerical simulation of the process of 
hydrodynamic cavitation of a water-fuel emulsion during its treatment in a 
hydrodynamic cavitator.
To solve the stated problem, a computational domain and grid describing 
(Fig.1) the flow part of a hydrodynamic cavitator was built, and the thermophysical 
properties of the working medium 
– a mixture of diesel fuel and water with averaged 
thermophysical properties, were described. Next, the boundary conditions at the 
inlet were described 
– flow velocity, and at the outlet – conditions of flow to the fuel 
tank. The k-e turbulence model was used to simulate turbulent flows. The 
distribution of the velocity the water-fuel emulsion is shown in Fig. 2. 
Figure 1 - Grid describing of hydrodynamic cavitator 
Figure 2 - Velocity the water-fuel emulsion, m/s 
Numerical simulation established that hydrodynamic cavitation is a very 
intense process (the dimensionless parameter 
– the cavitation index under 
considered conditions Х = 0.7 – steady hydrodynamic cavitation).
The study allows drawing the following conclusions: 
- using water-fuel emulsions reduces diesel fuel consumption and improves 
the ecological performance of a transport diesel engine; 
- maintain g the stability of a water-fuel emulsion is the necessary condition 
for ensuring effective running of a diesel engine with such fuel; 
- water-fuel emulsion treatment in a hydrodynamic cavitator helps maintain 
effectively the stability of such fuel; 
- to ensure reliable operation of a hydrodynamic cavitator, it is necessary to 
avoid super cavitation conditions with the cavitation index Х << 1. This is achieved 
by choosing operating conditions and design parameters, and also depends on the 
thermophysical properties of the working medium. 

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