Abstract
The inhomogeneous distribution of parallel pipe flow leads to difficulty in the efficient and reliable operation of fluid power equipment. In view of this, a new type of rectifier nozzle has been proposed in parallel pipelines. Numerical simulation and experimental studies were used to reveal the influence of the rectification nozzle on the flow distribution characteristics. The hydraulic characteristics of the parallel pipelines with and without rectifier nozzles were compared and analyzed. The effects of the temperature and inlet flow on the flow uniformity were studied. The results showed that the initial temperature had little effect on the flow distribution of parallel pipelines, and the flow rates of the branches were not much different. The inlet flow had great influence on the distribution characteristics of the parallel pipelines, but the rectifier nozzles changed the local resistance structure and pressure distribution at the shunt, thereby improving the non-uniformity of the flow distribution of the parallel pipelines, and the maximum difference between the two pipes was optimized from 28.89 t/h (20.3%) to 2.2 t/h (1.5%). The rectifying nozzle could distort the flow field of each branch during the split, making the distribution of flow rate and flow state more uniform and stable. At high inlet fluid temperatures, cavitation could occur under the pressure drop of the nozzle, and partial cavitation had little effect on the flow distribution.
Highlights
IntroductionParallel pipelines are widely used as an inevitable flow form for water delivery systems
Parallel pipelines are widely used as an inevitable flow form for water delivery systems. there are already rich theoretical and empirical results, the flow distribution of parallel pipes is affected by factors such as resistance along the path and local resistance
The results show that the pressure difference between the inlet and outlet has little effect on the flow distribution; flow distribution can be more uniform by reducing the diameter of the header along the flow direction
Summary
Parallel pipelines are widely used as an inevitable flow form for water delivery systems. There are already rich theoretical and empirical results, the flow distribution of parallel pipes is affected by factors such as resistance along the path and local resistance. It is difficult to maintain the fluid power equipment after the branch pipe efficiently and reliably if the flow uniformity of the branch pipe is poor. It is important to study the flow distribution characteristics of the parallel pipeline. Many domestic and foreign scholars have carried out a large number of numerical calculations and experimental studies on flow characteristics in parallel pipeline systems. Keller et al [1]
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