Performance Test Of Dye Cycle System And Structure Improvement Of Dye Cell

As the loading equipment of the dye cell,the dye cycle system provides an important guarantee for the performance of the dye cell.Dye cycle system is widely used in laser,wastewater treatment and utilization.As the core part of the dye cycle system,the dye cell is difficult to maintain the uniformity of the flow state due to its special internal structure.It is very important to study the refractive index,boundary layer thickness and vorticity distribution of dye cell.However,the research on dye cycle system and dye cell is not comprehensive.In this paper,the performance of the dye cycle system and the internal flow characteristics of the dye cell are studied by numerical simulation and experiment.The structure of the dye cell is improved.The main work and research results are as follows:1.The current research status of dye cycle system and dye cell is described.The particle image velocimetry and refractive index are summarized.2.The performance test-bed of the dye cycle system is built to measure the energy characteristics,cavitation characteristics,pressure pulsation,vibration and noise characteristics of the power frequency vortex pump at 30 Hz,40Hz and 50 Hz and to measure the pressure pulsation,vibration characteristics,noise and temperature characteristics of the inlet and outlet of the dye cell and the outlet of the vortex pump when the valve is fully open and half open.The results show that the best efficiency point of the vortex pump deviates from the speed to the large flow rate.The critical NPSH increases with the increase of flow rate and power frequency.The wide frequency band of pressure fluctuation shortens with the increase of flow rate.The mean value of pressure fluctuation increases with the increase of power frequency.The noise decreases with the increase of flow rate.The pressure difference between the two ends of the dye cell increases with the increase of power frequency and flow rate.The pressure fluctuation amplitude at the outlet of vortex pump in dye cycle system increases with the increase of power frequency anddecreases with the increase of flow rate.The vibration velocity amplitude of measuring points M4,M5 and M6 increases with the increase of power frequency.While that of measuring point M7 decreases first and then increases.The vibration velocity amplitude of each measuring point decreases with the increase of flow rate.The noise increases with the increase of power frequency and decreases with the increase of flow rate.The temperature increases with the increase of power frequency.However,it increases and decreases with the increase of flow.3.The dye cell is tested by building a visual test-bed.Based on the particle image velocimetry and the background oriented schlieren,the flow state and the refractive index of the dye cell under 3 different flow rates at 50 Hz power frequency are analyzed.The results show that the distribution of streamline in the dye cell is uniform.The velocity gradient increases with the increase of velocity.When v=5.99m/s,the refractive index range is 0.99989~1.00015.When v=7.82m/s,the refractive index range is 0.99985~1.00025.When v=9.80m/s,the refractive index range is 0.99983~1.00025.4.Based on the CFX,the boundary layer thickness,velocity distribution,pressure distribution and vortex core distribution of dye cell channel were analyzed when the velocity is 6m/s,8m/s and 10m/s.The structure of the main flow channel of the dye cell was improved.Its contraction angle and diffusion angle were changed and the sharp corner of channel was chamfered.Four better schemes were selected for comparative analysis.The results show that the distribution of boundary layer in dye cell is similar at different flow rates.The average thickness of boundary layer is0.020 mm.The velocity gradients of the shrinking and diffusing sections of the dye cell are large.And there are vortices in the diffusing section.The pressure distribution in the contraction section and the middle section of the dye cell is symmetrical.The pressure distribution in the diffusion section is disordered.The pressure drop at the inlet and outlet increases with the increase of flow rate.With the increase of the flow rate,the distribution of the vortex core in the dye cell alsoincreased significantly,mainly in the diffusion section of the dye cell.The distribution of the vortex core in the middle section is also increased obviously,which is symmetrical.There are a few vortices and circumfluence in the improved schemes,which have little influence on the overall flow state.The flow state is better than the Original Scheme.The pressure of the inlet section of the improved schemes is basically the same as that of the Original Scheme.The pressure of the outlet section is significantly higher than that of the Original Scheme.The pressure drop at the inlet and outlet of the dye cell is reduced.In Scheme F and Scheme G,the volume proportion of vortex core in the flow passage is lower than that in the Original Scheme.