Design And Research Of Fish Suction Pump For Antarctic Krill Fishing Vessel

Antarctic krill fish pump is the key equipment to realize continuous fishing technology of Antarctic krill and improve the fishing efficiency.For the hydraulic design of the main components of the Antarctic krill fish pump,this paper refers to the hydraulic design method of the double-channel pump.Three-dimensional modeling of the computational fluid field of the Antarctic krill sfish pump was carried out by using three-dimensional solid modeling software NX.In order to study the internal flow characteristics and hydraulic performance of the Antarctic krill fish pump,the computational fluid dynamics software FLUENT applied the static value simulation calculation of the single-phase clear water medium and the liquid-solid two-phase medium of the Antarctic krill fish pump,respectively.In the steady numerical calculation of single-phase clean water medium,the distribution of static pressure and velocity field in the flow field of fish pump is determined to be reasonable and accord with the basic theory.At the design flow rate,when the speed is 1300 r/min,the efficiency of Antarctic krill fish pump is the highest,and the speed range of high efficiency is relatively wide.At the same time,when the speed is1400 ? 1500 r / min,the fluid trace of the Antarctic krill fish pump is smooth,without obvious whirlpool and turbulence,which can effectively reduce the impact of the fluid medium and the wall surface,and is suitable for the non-destructive transportation of Antarctic krill.In the steady numerical calculation of liquid-solid two-phase medium,this paper simplified Antarctic krill as solid particles,took particle diameter,particle concentration and flow rate as variables,and divided them into experimental groups by using control variable method,so as to study the influence of the changes of variables on the flow characteristics and hydraulic performance of Antarctic krill fish pump.The numerical calculation results show that with the increase of particle diameter,the static pressure and velocity field in the fish pump are less affected by it,the solid phase segregation in the channel is enhanced,the collision between the particles and the wall surface of the volute is more frequent,and the damage of Antarctic krill will increase.With the increase of particle concentration,the static pressure and velocity field in the fish pump are less affected;the solid phase distribution in the flow channel is obviously different,and the collision between the working surface and the particles in the impeller flow channel is more frequent,which is not conducive to the non-destructive transportation of the Antarctic krill,and the high volume concentration area of the particles in the volute flow channel becomes larger,which can also increase the possibility of damage to the Antarctic krill.The distribution of the static pressure and velocity field in the volute of the fish pump changes obviously with the increase of the flow rate,and the static pressure distribution in the volute is the relatively uniform when the flow rate is in Q ?1.1 Q.The solid phase segregation in the flow channel is weakened,the high concentration area in the impeller flow channel increases gradually,and the collision between particles and the wall is increased.The high concentration area in the volute flow channel decreases.When the flow rate is 0.9 Q ? Q,the solid phase volume concentration distribution in the flow channel is relatively uniform and the transportation capacity is relatively good.In addition,combined with the efficiency of fish pumps at different flow rates,the flow rate between 0.9 Q and 1.1 Q is more suitable for Antarctic krill fishing.