阀门开度对分叉管道分流比及局部水头损失的影响OA

This study aims to investigate the impact of valve opening on the hydraulic performance of oblique tee pipelines,determine the relationship between flow distribution and local loss coefficients in bifurcated pipeline systems and their influencing factors,thereby enhancing the accuracy of hydraulic calculations for pipeline systems.A bifurcated pipeline system was constructed using DN63 PVC pipes and oblique tees.System hydraulic performance tests were conducted under 25 different valve opening combinations.Pressure transmitters and ultrasonic flow meters were used to precisely measure pressure and flow rates in each pipe segment,comparing the effects of different valve openings on the diversion ratio and local head loss.Results indicate that as the valve opening increases,the total flow rate of the branched pipeline system shows an overall upward trend.The diversion ratio increases with greater valve opening in the branch pipe but decreases with greater valve opening in the main pipe.Valve opening significantly influenced the local head loss coefficients ζ₀₋₁ and ζ₀₋₂ in the branched pipeline.The diversion ratio exhibited a quadratic relationship with both local head loss coefficients ζ₀₋₁ and ζ₀₋₂.Numerical simulation results were generally consistent with experimental findings,establishing empirical formulas for ζ₀₋₁ and ζ₀₋₂.The study also revealed the distribution patterns and gradient changes of flow velocity under various operating conditions.This study elucidates the influence of valve opening on the diversion ratio and local head loss in bifurcated pipeline systems,demonstrating that adjusting valve opening can reduce hydraulic losses.This finding provides theoretical support for understanding the variability of hydraulic losses in bifurcated pipelines and offers feasible control measures for optimizing the design and operational management of such systems under diverse hydraulic conditions.